Ultra-high-temperature tensile properties and fracture behavior of ZrB₂-based ceramics in air above 1500 ¡ãC

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• 作者：Rubing Zhang ; Xiangmeng Cheng ; Daining Fang ; Liaoliang Ke ; Yuesheng Wang
• 关键词：A. Zirconium diboride ceramic matrix ; C. Sintering ; E. Mechanical property ; F. Microstructure
• 刊名：Materials and Design
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：52
• 期：Complete
• 页码：17-22
• 全文大小：2433 K

文摘

Nearly fully dense ZrB₂-SiC-graphite composites were fabricated from commercially available powder at 1900 ¡ãC by hot pressing. The tensile strength of ZrB₂-based ceramics was measured in air up to 1750 ¡ãC, which is the first reported tensile strength measurement in air above 1500 ¡ãC. A mechanical testing apparatus capable of testing material in ultra-high temperature under air atmosphere was built, evaluated, and used. Tensile strength was measured as a function of temperature up to 1750 ¡ãC in air. The respective average values of the tensile strength measured at 1550 ¡ãC, 1650 ¡ãC, and 1750 ¡ãC are 58.4, 44.8, and 21.8 MPa, which are 49.4 % , 37.9 % , and 18.4 % of their room-temperature strength (118.2 MPa), respectively. Moreover, the tensile fracture behaviors and mechanism of ZrB₂-based ceramics at different testing temperatures were discussed based on microstructure characterization.