大功率CO_2激光原位直接反应合成TiN/Ti复合材料的研究  

STUDY OF TiN/Ti COMPOSITE MATERIAL BY REACTIVE CO 2 LASER DIRECT SYNTHESIS IN SITU

作　　者：汪洪海[1,2] 郑启光[1,2] 陶星之[1,2] 王涛 辜建辉[1,2] 何秀丽[1,2] 王华明[1,2] 

机构地区：[1]华中理工大学激光技术国家重点实验室 [2]北京航空航天大学

出　　处：《复合材料学报》1999年第1期111-116,共6页Acta Materiae Compositae Sinica

摘　　要：使用大功率ＣＯ２激光原位直接反应合成ＴｉＮ／Ｔｉ复合材料，分析了材料的微观结构、物相组成、成分及显微硬度分布。结果发现：氮化层是富钛结构的，由ＴｉＮ相和α－Ｔｉ构成，ＴｉＮ以枝晶形式在氮化层均匀分布。材料横截面显微硬度连续变化。氮化层的氮化程度随激光作用时间的增加而增加，辐照的激光能量密度越高，氮化层的厚度越大。激光功率密度，激光扫描速度，氮气喷射压强分别为３．３５×１０５Ｗｃｍ－２，３００ｍｍｍｉｎ－１，０．３５ＭＰａ时，材料表面硬度值达到Ｈｖ１６００，氮化层的厚度有３５０μｍ。TiN/Ti composite material was prepared with high power CO 2 laser focused on the surface of titanium alloy in nitrogen ambient. The microstructure, composition and micro hardness of the material were analyzed with SEM, XRD, EP (electron probe) and Micro hardometer. The results show that nitride layers consist of TiN and α Ti phase. TiN dendrites distribute in nitride layer homogeneously. The nitride level and maximum micro hardness increase with reaction time increasing. The cross section micro hardness of the material changes continuously. The higher laser energy density, the deeper nitride layers. The depth of nitride layer and the surface micro hardness are 350μm and Hv1600 as the laser power density is of 3.35×10 5 W·cm -2 , scanning velocity of 300mm·min -1 , and nitrogen pressure of 0.35MPa respectively.

关 键 词：复合材料 氮化钛 激光原位合成 直接反应 

分 类 号：TB33[一般工业技术—材料科学与工程]