Pressure-induced preferential grain growth, texture development and anisotropic properties of hot pressed hexagonal boron nitride ceramics

Pressure-induced preferential grain growth, texture development and anisotropic properties of hot pressed hexagonal boron nitride ceramics
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热压六方氮化硼陶瓷的压力诱导择优晶粒生长、织构发展和各向异性性能

DOI:
10.1016/j.scriptamat.2011.08.025
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发表时间:
2011-12
期刊:
影响因子:
6
通讯作者:
Zhang, Guo-Jun
Zhang, Guo-Jun
中科院分区:
材料科学1区
文献类型:
--
作者:
Xue, Jia-Xiang;Liu, Ji-Xuan;Xie, Bin-Huan;Zhang, Guo-Jun

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以氮化硼粉为原料,采用热压法制备了织构六方氮化硼陶瓷。结果表明,当使用有序度低、粒度分布宽的氮化硼粉末时,较高的烧结温度和适度的外压有助于形成织构化的显微组织。通过压力诱导的晶粒择优生长,片状氮化硼晶粒倾向于沿着热压方向取向。所得织构氮化硼陶瓷表现出较强的各向异性力学性能和热性能。
Textured hexagonal boron nitride ceramics were prepared by hot pressing, using boron nitride powders as starting materials. The results showed that a high sintering temperature and moderate external pressure helped to form a textured microstructure when using boron nitride powder with a low degree of order and a broad particle size distribution. The flake-like boron nitride grains tended to orient along the hot pressing direction via pressure-induced preferential grain growth. The obtained textured boron nitride ceramics demonstrated strong anisotropic mechanical and thermal properties.
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