TiB-TiB_2陶瓷复合材料的放电等离子烧结致密化

Transactions of Beijing Institute of Technology(2010)

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Abstract
通过放电等离子烧结技术制备了新型的TiB-TiB2陶瓷复合材料,测试了复合材料的微观组织和力学性能,研究了复合材料微观组织的演化规律,揭示了复合材料的放电等离子烧结致密化机理.烧结前期,通过放电效应使Ti发生高温溅射,在TiB2颗粒间形成流线型丝状连接;随着温度的升高,TiB2颗粒与熔融的钛金属之间发生化学反应,生成的TiB呈棒状生长;烧结后期,随着烧结温度的提高,在焦耳热效应和烧结压力的共同作用下,塑性变形和固相扩散成为主要烧结机制,使复合材料迅速达到致密.
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Key words
densification mechanism,spark plasma sintering,TiB-TiB2 ceramic composites
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