Hot‐Pressed ZrB2–SiC Ceramics with VC Addition: Chemical Reactions, Microstructures, and Mechanical Properties
Hot‐Pressed ZrB2–SiC Ceramics with VC Addition: Chemical Reactions, Microstructures, and Mechanical Properties
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DOI：
10.1111/j.1551-2916.2009.03293.x
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发表时间：
2009-12
影响因子：
3.9
通讯作者：
J. Zou;Guo‐Jun Zhang;Y. Kan;Pei-ling Wang
中科院分区：
文献类型：
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作者：
J. Zou;Guo‐Jun Zhang;Y. Kan;Pei-ling Wang
利用热力学分析和实验结果，研究了VC对ZrB 2-SiC超高温陶瓷（UHTCs）致密化、显微结构和力学性能的影响。VC与ZrB_2起始粉末颗粒表面不可避免存在的氧化物（ZrO_2）杂质或与ZrB_2基体相的化学反应可以通过调节热压过程中的气氛来控制。热压过程中不同的化学反应也导致了材料微观结构的差异，从而导致材料性能的差异。在ZrB 2-SiC体系中，添加VC和适当的烧结气氛有利于细化ZrB 2晶粒，提高力学性能。通过适当控制这些反应，可以定制ZrB 2-SiC基UHTCs的显微结构和力学性能。
Alterable roles of VC addition on the densification, microstructure development, and mechanical properties of the ZrB2–SiC ultrahigh temperature ceramics (UHTCs) were comprehensively investigated based on utilizing the thermodynamic analysis and experimental results. Chemical reactions of VC with the inevitably existed oxide (ZrO2) impurity on the particle surfaces of the ZrB2 starting powder, or with the ZrB2 matrix phase could be controlled by adjusting the atmospheres during hot pressing. Different chemical reactions during hot pressing also resulted in much different material microstructures and then different material properties. Benefiting the VC addition and proper sintering atmosphere, refined grain size of ZrB2 and improved mechanical properties were developed in ZrB2–SiC systems. By properly controlling these reactions, the microstructures and mechanical properties of ZrB2–SiC based UHTCs could be tailored.