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超重力下燃烧合成高硬(Ti,W)C基复合陶瓷

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Abstract:

用超重力下燃烧合成(combustionsynthesisunderhighgravity)法制备了(Ti,W)C基复合陶瓷。用X射线衍射仪、场发射扫描电镜及能谱仪研究了陶瓷产品的物相组成与微观形貌。对陶瓷的形成机理进行了分析,同时对陶瓷的性能进行了测试。结果表明(Ti,W)C陶瓷基体主要由TiC与(Ti0.55W0.45)C0.51组成;其形成机理主要分为两个阶段,首先在超重力下燃烧反应快速进行,生成液态氧化物位于上部、Ti-W-Fe-C-B合金液位于下部的分层熔体结构,最后由于C原子相对于B原子具有更高的浓度与更快的扩散速率,TiC在合金液相冷却过程中优先成核、析出,随即,(Ti0.55W0.45)C0.51依附于TiC而析出。力学性能测试表明,(Ti,W)C基复合陶瓷相对密度、Vickers硬度、弯曲强度及断裂韧性分别为99.3%,25.6GPa,1060MPa与8.5MPa·m1/2。

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