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SiC含量对ZTA和ATZ复相陶瓷力学及热学性能的影响 预览

Effect of SiC Content on Mechanical and Thermal Properties of ZTA andATZ Composite Ceramics
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摘要 以α-Al2O3、ZrO2和β-SiC粉体为原料,通过放电等离子烧结(SPS)制备了氧化物/碳化物复相陶瓷材料,研究了SiC掺杂对氧化锆增韧氧化铝(ZTA)和氧化铝增强氧化锆(ATZ)基两种复相陶瓷微观结构以及力学、热学性能的影响。XRD衍射谱显示样品中成分为α-Al2O3、ZrO2和β-SiC,无其他杂质相存在。随着SiC含量的增加,ZTA-SiC复相陶瓷的断裂韧性先增大至7.6 MPa m^1/2后下降为6.6 MPa m^1/2,而ATZ-SiC复相陶瓷的断裂韧性未发生明显变化,恒定为约11 MPa m^1/2。SEM图像显示韧性较大的复合陶瓷中的穿晶断裂作用机制明显。相同温度下,复相陶瓷的热导率随SiC添加量的增加而增加,当温度为1200 ℃时,ZTA-SiC和ATZ-SiC复相陶瓷的热导率随SiC含量的增加分别由4.31 W/m K增加至5.50 W/m K,5.39 W/m K增加至8.10 W/m K。 Oxide/carbide composite ceramics were prepared by spark plasma sintering (SPS) using α-Al2O3, ZrO2 and β-SiC powders as raw materials. The e ffects of SiC doping on the microstructure, mechanical and thermal properties of zirconia-toughened alumina (ZTA)- and alumina-toughened zirconia (ATZ)- based composites were investigated. The XRD patterns show that the components in the sample are α-Al2O3, ZrO2 and β-SiC, and no other impurity phases exist. As the SiC content increases, the fracture toughness of ZTA-SiC composite ceramics increases from 4.3 to 7.6 MPa m^1/2 at first and then decreases to 6.6 MPa m^1/2, while the fracture toughness of ATZ-SiC composite ceramics shows no obvious changes, which is constant at about 11 MPa m^1/2. SEM images show that the high toughness of the samples is attributed to the transgranular fracture, which increases at first and then decreases as the SiC content increases. At the same temperature, the thermal conductivity of the composite ceramics increases with the content of SiC. The thermal conductivities of ZTA-SiC and ATZ-SiC composite ceramics increasefrom 4.31 and 5.39 W/m K to 5.50 and 8.10 W/m K, respectively, when the temperature goes up to 1200 °C.
作者 柴建龙 郭亚威 朱亚滨 李淑芬 申铁龙 姚存峰 崔明焕 王志光 CHAI Jianlong;GUO Yawei;ZHU Yabin;LI Shufeng;SHEN Tielong;YAO Cunfeng;CUI Minghuan;WANG Zhiguang(Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730070, Gansu, China;University of Chinese Academy of Sciences, Beijing 100049, China)
出处 《陶瓷学报》 CAS 北大核心 2019年第2期228-233,共6页 Journal of Ceramics
基金 国家自然科学基金(91426301 11505247 11575258 11505246 11605256)。
关键词 SiC ZTA/ATZ复相陶瓷 断裂韧性 弯曲强度 热导率 SiC ZTA/ATZ composite ceramics fracture toughness bending strength thermal conductivity
作者简介 通信联系人:朱亚滨(1985-),男,博士,副研究员。
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