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金属学报  2014 

激光原位制备硼化钛与镍钛合金增强钛基复合涂层

DOI: 10.11900/0412.1961.2014.00185, PP. 1513-1519

Keywords: 激光熔覆,TC4钛合金,TiB,NiTi

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Abstract:

以不同配比的Ni粉末和TiB2粉末混合物为预置层,利用激光原位技术在钛合金表面制备了bcc结构的NiTi合金、TiB短纤维与TiB2颗粒增强钛基复合涂层.运用XRD,SEM与EPMA等实验手段,对合成的钛基复合涂层进行测试分析.结果表明,随着激光功率密度与Ni粉末添加量的增加,涂层表面成型质量得到改善;然而随着Ni添加量的提高,涂层中出现了NiTi2新相,且TiB短纤维变得粗大;通过热力学计算可知,反应驱动力大小顺序为Ni3Ti>NiTi2>NiTi>TiB,并结合涂层中相种类及含量的变化规律,探讨了不同元素反应间的竞争机制.

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