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关于炭石墨密基耐烧蚀性能提升方法的研究
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作者 肖海波 《炭素》 2019年第3期44-46,共3页
由于炭石墨材料是由碳基体增强碳制成的材料,其组分为不同形态的碳,碳在高温下容易烧蚀,研究发现:炭石墨材料在400℃以上就会迅速烧蚀,各种性能都明显下降,炭石墨材料的易烧蚀性能限制了其在航空航天领域、军事领域的进一步应用。本文... 由于炭石墨材料是由碳基体增强碳制成的材料,其组分为不同形态的碳,碳在高温下容易烧蚀,研究发现:炭石墨材料在400℃以上就会迅速烧蚀,各种性能都明显下降,炭石墨材料的易烧蚀性能限制了其在航空航天领域、军事领域的进一步应用。本文对炭石墨材料的耐烧蚀性能提高进行相关的研究。 展开更多
关键词 耐烧蚀 炭石墨 研究
Systematic review of ablative therapy for the treatment of renal allograft neoplasms 预览
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作者 Evaldo Favi Nicholas Raison +6 位作者 Federico Ambrogi Serena Delbue Maria Chiara Clementi Luca Lamperti Marta Perego Matteo Bischeri Mariano Ferraresso 《世界临床病例杂志》 2019年第17期2487-2504,共18页
BACKGROUND To date,there are no guidelines on the treatment of solid neoplasms in the transplanted kidney.Historically,allograft nephrectomy has been considered the only reasonable option.More recently,nephron-sparing... BACKGROUND To date,there are no guidelines on the treatment of solid neoplasms in the transplanted kidney.Historically,allograft nephrectomy has been considered the only reasonable option.More recently,nephron-sparing surgery (NSS) and ablative therapy (AT) have been proposed as alternative procedures in selected cases.AIM To review outcomes of AT for the treatment of renal allograft tumours.METHODS We conducted a systematic review according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses 2009 Checklist.PubMed was searched in March 2019 without time restrictions for all papers reporting on radiofrequency ablation (RFA),cryoablation (CA),microwave ablation (MWA),high-intensity focused ultrasound (HIFU),and irreversible electroporation (IRE) of solid tumours of the kidney allograft.Only original manuscripts describing actual cases and edited in English were considered.All relevant articles were accessed in full text.Additional searches included all pertinent references.Selected studies were also assessed for methodological quality using a tool based on a modification of the Newcastle Ottawa scale.Data on recipient characteristics,transplant characteristics,disease characteristics,treatment protocols,and treatment outcomes were extracted and analysed.Given the nature and the quality of the studies available (mostly retrospective case reports and small retrospective uncontrolled case series),a descriptive summary was provided.RESULTS Twenty-eight relevant studies were selected describing a total of 100 AT procedures in 92 patients.Recipient age at diagnosis ranged from 21 to 71 years whereas time from transplant to diagnosis ranged from 0.1 to 312 mo.Most of the neoplasms were asymptomatic and diagnosed incidentally during imaging carried out for screening purposes or for other clinical reasons.Preferred diagnostic modality was Doppler-ultrasound scan followed by computed tomography scan,and magnetic resonance imaging.Main tumour types were: papillary renal cell carcinoma (RCC) and clear cel 展开更多
关键词 ABLATIVE therapy CRYOABLATION Radiofrequency ablation Microwave ablation High-intensity focused ultrasonography IRREVERSIBLE ELECTROPORATION Neoplasm Kidney TRANSPLANT Renal ALLOGRAFT Systematic review
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Oligometastases in prostate cancer: Ablative treatment 预览
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作者 Amelia Béjar-Luque Milagrosa Rodríguez-Linán Sonia García-Cabezas 《世界临床肿瘤学杂志(英文版)》 2019年第2期38-51,共14页
Technological advances in radiotherapy have led to the introduction of techniques such as stereotactic body radiation therapy (SBRT), allowing the administration of ablative doses. The hypothesis that oligometastatic ... Technological advances in radiotherapy have led to the introduction of techniques such as stereotactic body radiation therapy (SBRT), allowing the administration of ablative doses. The hypothesis that oligometastatic disease may be cured through local eradication therapies has led to the increasing use of SBRT in patients with this type of disease. At the same time, scientific advances are being made to allow the confirmation of clinically suspected oligometastatic status at molecular level. There is growing interest in identifying patients with oligometastatic prostate cancer (PCa) who may benefit from curative intent metastasis-directed therapy, including SBRT. The aim is to complement, replace or delay the introduction of hormone therapy or other systemic therapies. The present review aims to compile the evidence from the main ongoing studies and results on SBRT in relation to oligometastatic PCa;examine aspects where gaps in knowledge or a lack of consensus persist (e.g., optimum schemes, response assessment, identification and diagnosis of oligometastatic patients);and document the lack of first-level evidence supporting the use of such techniques. 展开更多
关键词 OLIGOMETASTASES Metastasis-directed THERAPY STEREOTACTIC body radiation THERAPY STEREOTACTIC ABLATIVE radiotherapy Prostate cancer
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Successive Picket Drive for Mitigating the Ablative Richtmyer–Meshkov Instability
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作者 李蒙 叶文华 《中国物理快报:英文版》 SCIE CAS CSCD 2019年第2期28-31,共4页
The ablative Richtmyer–Meshkov instability(ARMI)is crucial to the successful ignition implosion of the inertial confinement fusion(ICF)because of its action as the seed of the Rayleigh–Taylor instability.In usual IC... The ablative Richtmyer–Meshkov instability(ARMI)is crucial to the successful ignition implosion of the inertial confinement fusion(ICF)because of its action as the seed of the Rayleigh–Taylor instability.In usual ICF implosions,the first shock driven by various foots of the pulses plays a central role in the ARMI growth.We propose a new scheme for refraining from ARMI with a pulse of successive pickets.With the successive-picket pulse design,a rippled capsule surface is compressed by three successive shocks with sequentially strengthening intensities and ablated stabilization,and the ablative Richtmyer–Meshkov growth is mitigated quite effectively.Our numerical simulations and theoretical analyses identify the validity of this scheme. 展开更多
关键词 RMI ICF Successive PICKET DRIVE for Mitigating the ABLATIVE Richtmyer Meshkov INSTABILITY
某变电站变压器直连故障原因分析 预览
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作者 李杰 张荻 董斌 《平顶山学院学报》 2019年第2期26-29,34共5页
针对某变电站2号变66 k V侧C相油气套管部分严重烧蚀的问题,对烧蚀故障部位进行现场检查,确定了故障最初发生位置.通过对该故障间隔样品进行解体检查、关键零部件尺寸检测、不同接触情况下的接触电阻测量验证、分解物化验等试验,得出C... 针对某变电站2号变66 k V侧C相油气套管部分严重烧蚀的问题,对烧蚀故障部位进行现场检查,确定了故障最初发生位置.通过对该故障间隔样品进行解体检查、关键零部件尺寸检测、不同接触情况下的接触电阻测量验证、分解物化验等试验,得出C相直连筒体内部导体连接部位接触不良发热,长期积累造成导体熔化,金属熔化物朝筒体内壁溅射造成接地故障. 展开更多
关键词 油气套管 现场检查 烧蚀 接触不良 接地故障
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Stereotactic body radiation therapy for non-small cell lung cancer:A review 预览
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作者 Kavitha M Prezzano Sung Jun Ma +3 位作者 Gregory M Hermann Charlotte I Rivers Jorge A Gomez-Suescun Anurag K Singh 《世界临床肿瘤学杂志(英文版)》 2019年第1期14-27,共14页
Stereotactic body radiation therapy(SBRT)is the treatment of choice for medically inoperable patients with early stage non-small cell lung cancer(NSCLC).A literature search primarily based on PubMed electronic databas... Stereotactic body radiation therapy(SBRT)is the treatment of choice for medically inoperable patients with early stage non-small cell lung cancer(NSCLC).A literature search primarily based on PubMed electronic databases was completed in July 2018.Inclusion and exclusion criteria were determined prior to the search,and only prospective clinical trials were included.Nineteen trials from 2005 to 2018 met the inclusion criteria,reporting the outcomes of 1434 patients with central and peripheral early stage NSCLC.Patient eligibility,prescription dose and delivery,and follow up duration varied widely.Threeyears overall survival ranged from 43%to 95%with loco-regional control of up to 98%at 3 years.Up to 33%of patients failed distantly after SBRT at 3 years.SBRT was generally well tolerated with 10%-30%grade 3-4 toxicities and a few treatment-related deaths.No differences in outcomes were observed between conventionally fractionated radiation therapy and SBRT,central and peripheral lung tumors,or inoperable and operable patients.SBRT remains a reasonable treatment option for medically inoperable and select operable patients with early stage NSCLC.SBRT has shown excellent local and regional control with toxicity rates equivalent to surgery.Decreasing fractionation schedules have been consistently shown to be both safe and effective.Distant failure is common,and chemotherapy may be considered for select patients.However,the survival benefit of additional interventions,such as chemotherapy,for early stage NSCLC treated with SBRT remains unclear. 展开更多
关键词 LUNG CANCER NON-SMALL cell LUNG CANCER STEREOTACTIC body radiation therapy STEREOTACTIC ABLATIVE radiotherapy DISTANT failure
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Management of oligometastatic non-small cell lung cancer patients:Current controversies and future directions 预览
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作者 Felipe Counago Javier Luna +9 位作者 Luis Leonardo Guerrero Blanca Vaquero María Cecilia Guillén-Sacoto Teresa González-Merino Begona Taboada Verónica Díaz Belén Rubio-Viqueira Ana Aurora Díaz-Gavela Francisco JoséMarcos Elia del Cerro 《世界临床肿瘤学杂志(英文版)》 2019年第10期318-339,共22页
Oligometastatic non-small cell lung cancer(NSCLC)describes an intermediate stage of NSCLC between localized and widely-disseminated disease.This stage of NSCLC is characterized by a limited number of metastases and a ... Oligometastatic non-small cell lung cancer(NSCLC)describes an intermediate stage of NSCLC between localized and widely-disseminated disease.This stage of NSCLC is characterized by a limited number of metastases and a more indolent tumor biology.Currently,the management of oligometastatic NSCLC involves radical treatment(radiotherapy or surgery)that targets the metastatic lesions and the primary tumor to achieve disease control.This approach offers the potential to achieve prolonged survival in patients who,in the past,would have only received palliative measures.The optimal therapeutic strategies for the different scenarios of oligometastatic disease(intracranial vs extracranial disease,synchronous vs metachronous)remain undefined.Given the lack of head-to-head studies comparing radiotherapy to surgery in these patients,the decision to apply surgery or radiotherapy(with or without systemic treatment)must be based on prognostic factors that allow us to classify patients.This classification will allow us to select the most appropriate therapeutic strategy on an individualized basis.In the future,the molecular or microRNA profiles will likely improve the treatment selection process.The objective of the present article is to review the most relevant scientific evidence on the management of patients with oligometastatic NSCLC,focusing on the role of radiotherapy and surgery.We also discuss areas of controversy and future directions. 展开更多
关键词 Non-small cell lung cancer METASTASECTOMY OLIGOMETASTASES STEREOTACTIC ABLATIVE radiotherapy STEREOTACTIC body radiation therapy RADIOSURGERY
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Hypofractionated ablative radiation therapy for hepatocellular carcinoma: practical considerations and review of the literature
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作者 Marsha Reyngold Eugene J.Koay Christopher H.Crane 《肝癌研究(英文版)》 2018年第8期87-96,共10页
Hepatocellular carcinoma (HCC) is the most common primary liver malignancy. The prognosis for patients who present with inoperable primary liver tumors is poor with median survival times of 12 months or less. Tumor-re... Hepatocellular carcinoma (HCC) is the most common primary liver malignancy. The prognosis for patients who present with inoperable primary liver tumors is poor with median survival times of 12 months or less. Tumor-related liver failure is a common cause of mortality, underscoring the importance of local control. Recent advancements in external beam radiation therapy delivery techniques have enabled dose escalation that in turn has significantly improved local control and has allowed radiation therapy to emerge as an effective modality in this setting. In this review, we outline the critical practical aspects of treating liver tumors with radiation including choice of fractionation, motion management, image guidance and use of intensity-modulated radiation therapy vs. proton beam therapy. We review our approach to ablative radiation therapy for HCC with consideration of underlying cirrhosis and provide a brief overview of the current literature. 展开更多
关键词 HYPOFRACTIONATED ABLATIVE RADIATION therapy STEREOTACTIC ABLATIVE RADIOTHERAPY RADIATION large HEPATOCELLULAR carcinoma
Simultaneous curative resection of double colorectal carcinoma with synchronous bilobar liver metastases 预览
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作者 Emilio De Raffele Mariateresa Mirarchi +5 位作者 Dajana Cuicchi Ferdinando Lecce Claudio Ricci Riccardo Casadei Bruno Cola Francesco Minni 《世界胃肠肿瘤学杂志:英文版(电子版)》 CAS 2018年第10期293-316,共24页
Synchronous colorectal carcinoma(SCRC)indicates more than one primary colorectal carcinoma(CRC)discovered at the time of initial presentation,accounts for 3.1%-3.9%of CRC,and may occur either in the same or in differe... Synchronous colorectal carcinoma(SCRC)indicates more than one primary colorectal carcinoma(CRC)discovered at the time of initial presentation,accounts for 3.1%-3.9%of CRC,and may occur either in the same or in different colorectal segments.The accurate preoperative diagnosis of SCRC is difficult and diagnostic failures may lead to inappropriate treatment and poorer prognosis.SCRC requires colorectal resections tailored to individual patients,based on the number,location,and stage of the tumours,from conventional or extended hemicolectomies to total colectomy or proctocolectomy,when established predisposing conditions exist.The overall perioperative risks of surgery for SCRC seem to be higher than for solitary CRC.Simultaneous colorectal and liver resection represents an appealing surgical strategy in selected patients with CRC and synchronous liver metastases(CRLM),even though the cumulative risks of the two procedures need to be adequately evaluated.Simultaneous resections have the noticeable risks of the two procedures need to be adequately evaluated.Simultaneous resections have the noticeable advantage of avoiding a second laparotomy,give the opportunity of an earlier initiation of adjuvant therapy,and may significantly reduce the hospital costs.Because an increasing number of recent studies have shown good results,with morbidity,perioperative hospitalization,and mortality rates comparable to staged resections,simultaneous procedures can be selectively proposed even in case of complex colorectal resections,including those for SCRC and rectal cancer.However,in patients with multiple bilobar CRLM,major hepatectomies performed simultaneously with colorectal resection have been associated with significant perioperative risks.Conservative or parenchymal-sparing hepatectomies reduce the extent of hepatectomy while preserving oncological radicality,and may represent the best option for selected patients with multiple CRLM involving both liver lobes.Parenchymal-sparing liver resection,instead of major or two-stage hep 展开更多
关键词 COLORECTAL SURGERY SYNCHRONOUS COLORECTAL LIVER metastases Major HEPATECTOMY Parenchymalsparing HEPATECTOMY Intraoperative ultrasonography SIMULTANEOUS COLORECTAL and LIVER SURGERY SYNCHRONOUS COLORECTAL carcinoma Ablative therapies
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Stereotactic radiotherapy for prostate cancer:A review and future directions 预览
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作者 Yusef A Syed Ami K Patel-Yadav +1 位作者 Charlotte Rivers Anurag K Singh 《世界临床肿瘤学杂志》 2017年第5期389-397,共9页
Prostate cancer affects over 200000 men annually in the United States alone.The role of conventionally fractionated external beam radiation therapy(RT)is well established as a treatment option for eligible prostate ca... Prostate cancer affects over 200000 men annually in the United States alone.The role of conventionally fractionated external beam radiation therapy(RT)is well established as a treatment option for eligible prostate cancer patients;however,the use of stereotactic body radiotherapy(SBRT)in this setting is less well defined.Within the past decade,there have been a number of studies investigating the feasibility of SBRT as a potential treatment option for prostate cancer patients.SBRT has been well studied in other disease sites,and the shortened treatment course would allow for greater convenience for patients.There may also be implications for toxicity as well as disease control.In this review we present a number of prospective and retrospective trials of SBRT in the treatment of prostate cancer.We focus on factors such as biochemical progression-free survival,prostate specific antigen(PSA)response,and toxicity in order to compare SBRT to established treatment modalities.We also discuss future steps that the clinical community can take to further explore this new treatment approach.We conclude that initial studies examining the use of SBRT in the treatment of prostate cancer have demonstrated impressive rates of biochemical recurrencefree survival and PSA response,while maintaining a relatively favorable acute toxicity profile,though long-term follow-up is needed. 展开更多
关键词 STEREOTACTIC body RADIOTHERAPY PROSTATE cancer Radiation therapy HYPOFRACTIONATION Toxicity STEREOTACTIC ABLATIVE RADIOTHERAPY
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透明质酸及白藜芦醇的护肤品在剥脱性点阵激光术后修复中的应用 预览
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作者 王晓慧 李远宏 +6 位作者 陈小英 刘红梅 周珺 仲少敏 张子君 Astrid Desmons 吴艳 《中国美容医学》 CAS 2017年第2期56-60,共5页
目的:研究含透明质酸及白藜芦醇的护肤品对面部剥脱性点阵激光术后修复的有效性和安全性。方法:四家中心共入选100例进行面部铒/CO_2点阵激光治疗的女性受试者,采用随机、安慰剂对照的方法,观察含透明质酸及白藜芦醇的贝德玛舒缓修复... 目的:研究含透明质酸及白藜芦醇的护肤品对面部剥脱性点阵激光术后修复的有效性和安全性。方法:四家中心共入选100例进行面部铒/CO_2点阵激光治疗的女性受试者,采用随机、安慰剂对照的方法,观察含透明质酸及白藜芦醇的贝德玛舒缓修复霜(Cicabio霜)对于剥脱性点阵激光术后28d内的修复情况。于激光术前、术后0.5h、3d、7d、28d分别进行皮肤测试。每次测试包括皮肤红斑/黑素指数和经皮水分丢失(TEWL)测量,采集面部图片,记录脱痂时间,研究者主观评价皮肤红斑、水肿情况及各种皮肤不良反应。受试者进行主观症状评分。结果:贝德玛舒缓修复霜与乳膏基质1号相比,在第3天与28天,红斑指数的改善更明显,差异具有统计学意义(P〈0.05);在第7天和第28天黑素指数的改善程度均优于乳膏基质(P〈0.05);在第3天和第7天术后水肿程度均轻于乳膏基质1号(P〈0.05)。使用贝德玛舒缓修复霜的受试者主观评价术后瘙痒、灼热、疼痛、发干等症状相对乳膏基质1号更轻微,不良反应包括皮肤刺激反应发生率也低于乳膏基质1号(P〈0.05)。在改善TEWL和缩短脱痂时间方面贝德玛舒缓修复霜与乳膏基质1号相比无统计学差异(P〉0.05)。结论:贝德玛舒缓修复霜在剥脱性点阵激光术后立即使用没有明显不良反应,相对乳膏基质1号它可以更好地抑制皮肤炎症反应和后续的炎症后色素沉着。 展开更多
关键词 点阵激光 剥脱性 透明质酸 白藜芦醇 术后修复
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Target migration from re-inflation of adjacent atelectasis during lung stereotactic body radiotherapy 预览
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作者 Bijing Mao Vivek Verma +5 位作者 Dandan Zheng Xiaofeng Zhu Nathan R Bennion Abhijeet R Bhirud Maria A Poole Weining Zhen 《世界临床肿瘤学杂志》 2017年第3期300-304,共5页
Stereotactic body radiotherapy(SBRT)is a widely accepted option for the treatment of medically inoperable early-stage non-small cell lung cancer(NSCLC).Herein,we highlight the importance of interfraction image guidanc... Stereotactic body radiotherapy(SBRT)is a widely accepted option for the treatment of medically inoperable early-stage non-small cell lung cancer(NSCLC).Herein,we highlight the importance of interfraction image guidance during SBRT.We describe a case of earlystage NSCLC associated with segmental atelectasis that translocated 15 mm anteroinferiorly due to re-expansion of the adjacent segmental atelectasis following the first fraction.The case exemplifies the importance of crosssectional image-guided radiotherapy that shows the intended target,as opposed to aligning based on rigid anatomy alone,especially in cases associated with potentially“volatile”anatomic areas. 展开更多
关键词 RADIATION THERAPY STEREOTACTIC body RADIATION THERAPY Non-small cell LUNG cancer IMAGE-GUIDED RADIATION THERAPY STEREOTACTIC ablative RADIATION THERAPY
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Oligometastatic disease,the curative challenge in radiation oncology 预览
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作者 Amalia Palacios-Eito Sonia García-Cabezas 《世界临床肿瘤学杂志》 2015年第4期30-34,共5页
The concept of oligometastatic disease was first described by Hellman and Weichselbaum in 1995.The mere insight of this concept led to the hypothesis that this disease may be cured using local ablative weapons.Surgery... The concept of oligometastatic disease was first described by Hellman and Weichselbaum in 1995.The mere insight of this concept led to the hypothesis that this disease may be cured using local ablative weapons.Surgery has already demonstrated this hypothesis.Surgery limitations,either technical or due to refusal or associated comorbidity,have led to implement alternative ablative options such as stereotactic body radiation therapy(SBRT).SBRT evolved from(stereotactic radiosurgery)because of the need to irradiate extracranial lesions and has been shown to be safe and effective.SBRT achieves local control rates ranging from 70%-90%,but highly variable survival rates depending on the group analyzed.Series with heterogeneous metastatic sites and tumor origin have reported 20%survival rates at 2-3 years,similar to those achieved with surgery.Despite its excellent results,SBRT still faces significant clinical challenges.Its optimal integration with systemic treatment is unknown,and response assessment is very difficult.However,the greatest challenge lies in selection of patients most likely to remain oligometastatic,those who will most benefit from the technique.Biomarkers,molecular signatures,that accurately predict the biological behavior of malignancy are needed.The expression profile of specific miRNAs has been shown to have a potential in this regard. 展开更多
关键词 OLIGOMETASTASES RADIOTHERAPY STEREOTACTIC BODY RADIOTHERAPY STEREOTACTIC BODY radiation therapy STEREOTACTIC ablative BODY RADIOTHERAPY CURATIVE INTENT
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用 stereotactic 的变形的肝肿瘤的治疗夺格的放射疗法 预览
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作者 Vimoj J Nair Jason R Pantarotto 《世界放射学杂志:英文版(电子版)》 2014年第2期18-25,共8页
The prognosis of patients with metastatic liver disease remains dismal with a median survival of only 6-12 mo. As 80%-90% of patients are not candidates for surgical therapy, there is a need for effective non-surgica... The prognosis of patients with metastatic liver disease remains dismal with a median survival of only 6-12 mo. As 80%-90% of patients are not candidates for surgical therapy, there is a need for effective non-surgical therapies that would improve outcomes in these patients. The body of evidence related to the use of stereotactic ablative radiotherapy(SABR) in metastatic liver disease has substantially grown and evolved over the past decade. This review summarizes the current evidence supporting liver SABR with particular attention given to patient selection, target delineation, organ at risk dose volume constraints, response evaluation imaging and the various SABR techniques for delivering ablative radiotherapy to the liver. Even though it is unclear what dose-fractionation scheme, delivery system, concomitant therapy or patient selection strategy yields the optimum liver SABR outcomes, clear and growing evidence is available that SABR is a safe and effective therapy for the treatment of oligometastatic liver disease. 展开更多
关键词 LIVER METASTASIS STEREOTACTIC RADIOTHERAPY ABLATIVE
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轻质弹性隔热涂料的研制
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作者 陈玉滨 吴津成 魏超 《现代涂料与涂装》 CAS 2014年第8期10-13,16共5页
对不同成分的聚氨酯改性环氧有机硅体系进行了热失重及力学性能的分析研究和表征;探讨了中空微球和增强纤维对涂料密度、力学性能和烧蚀性能的影响.通过大量试验及验证,研制出能满足使用要求的轻质弹性隔热涂料.
关键词 低密度 隔热 烧蚀 聚氨酯 环氧有机硅
耐烧蚀有机硅-环氧树脂的制备及其协效残炭性能研究 预览 被引量:1
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作者 潘冬冬 蔡绪福 《中国塑料》 CSCD 北大核心 2014年第6期29-32,共4页
将一定比例的甲基硅树脂与环氧树脂共混,使用固化剂邻苯二甲酸酐固化制得耐烧蚀的有机硅-环氧树脂,探讨该树脂的协效残炭及其阻燃性能。结果表明,当甲基硅树脂∶环氧树脂=7∶3(质量比,下同)时,树脂具有较高残炭率,且出现协效残炭现象;同... 将一定比例的甲基硅树脂与环氧树脂共混,使用固化剂邻苯二甲酸酐固化制得耐烧蚀的有机硅-环氧树脂,探讨该树脂的协效残炭及其阻燃性能。结果表明,当甲基硅树脂∶环氧树脂=7∶3(质量比,下同)时,树脂具有较高残炭率,且出现协效残炭现象;同时,加入10%的阻燃剂聚磷酸铵(APP)时,其极限氧指数提高到33%,残炭量提高到68%。 展开更多
关键词 甲基硅树脂 环氧树脂 耐烧蚀 协效 残炭
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可瓷化酚醛复合材料烧蚀隔热性能研究 预览 被引量:11
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作者 秦岩 饶志龙 +1 位作者 刘慧娟 黄志雄 《玻璃钢/复合材料》 CAS CSCD 北大核心 2012年第S1期52-55,共4页
采用酚醛树脂为基体,添加功能填料微珠、可瓷化助剂制备低密度烧蚀隔热一体化材料。测试并分析了烧蚀/隔热一体化的烧蚀性能、热物理性能与静态隔热性能。并采用SEM和TEM观察烧蚀后材料的断面形貌变化与高温结构演变。结果表明,空心微... 采用酚醛树脂为基体,添加功能填料微珠、可瓷化助剂制备低密度烧蚀隔热一体化材料。测试并分析了烧蚀/隔热一体化的烧蚀性能、热物理性能与静态隔热性能。并采用SEM和TEM观察烧蚀后材料的断面形貌变化与高温结构演变。结果表明,空心微珠的加入都能提高隔热性能,空心玻璃微珠效果更好,在800℃以上可瓷化助剂与酚醛树脂开始发生了可陶瓷化反应,且随着烧蚀温度的提高陶瓷化程度加深。可陶瓷化反应有利于提高酚醛复合材料高温条件下结构完整性,从而可以同时提高酚醛复合材料的烧蚀和隔热性能。 展开更多
关键词 酚醛树脂 陶瓷化反应 烧蚀 隔热
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有机纤维/EPDM绝热材料性能研究 预览 被引量:11
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作者 高国新 郑元锁 +2 位作者 孙捷 谭溢波 金志浩 《固体火箭技术》 EI CAS CSCD 北大核心 2007年第6期 544-547,共4页
通过对腈纶短纤维、芳纶短纤维各自用量对EPDM绝热层材料烧蚀速率、孔隙率影响的研究,并结合氮气环境下热失重曲线和炭层SEM照片分析,发现腈纶短纤维不仅高温残炭率高于芳纶短纤维,而且可在较宽的温度范围内逐步热解炭化,烧蚀过程... 通过对腈纶短纤维、芳纶短纤维各自用量对EPDM绝热层材料烧蚀速率、孔隙率影响的研究,并结合氮气环境下热失重曲线和炭层SEM照片分析,发现腈纶短纤维不仅高温残炭率高于芳纶短纤维,而且可在较宽的温度范围内逐步热解炭化,烧蚀过程所产生的热解气体能逐步而快速地释放出炭层,结炭层孔隙率小,致密坚硬,能抵抗高温燃气流的烧蚀和冲蚀作用,材料的烧蚀速率较低;芳纶短纤维虽然具有较高的热稳定性,但热分解温度范围较窄,热解所产生的大量气体很难快速释放出炭层表面,结炭层孔隙率大,炭层疏松且呈层片状,不能抵抗高冲蚀性粒子流的烧蚀和冲蚀,烧蚀速率较高。 展开更多
关键词 腈纶纤维 芳纶纤维 三元乙丙橡胶 炭层 烧蚀 孔隙率
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抗烧蚀聚芳基乙炔树脂研究进展 预览 被引量:1
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作者 袁海根 曾金芳 杨杰 《热固性树脂》 CAS CSCD 2005年第4期 27-31,共5页
介绍了聚芳基乙炔所用单体的合成,聚合机理,阐述了其不足之处和国内外研究人员对聚芳基乙炔所做的改进,并指出其在航天材料领域广泛应用的潜力.
关键词 耐烧蚀 聚芳基乙炔 聚苯硅乙炔基苯 聚合机理
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固体火箭发动机喷管用C/C复合材料的研究进展 预览 被引量:9
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作者 尹健 熊翔 +1 位作者 张红波 黄伯云 《材料导报》 CSCD 2004年第4期 46-48,共3页
C/C复合材料已成为固体火箭发动机(SRM)最理想的喷管材料.综述了国内外SRM喷管用C/C复合材料的研究进展、应用状况以及烧蚀性能的研究状况,展望了今后C/C复合材料喷管的发展.
关键词 固体火箭发动机 喷管材料 C/C复合材料 烧蚀机理 喷管制备
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