选区激光熔化制备原位TiN-Ti₅Si₃复合材料的显微组织

来源期刊：金属学报2010年第6期

论文作者：顾冬冬 沈以赴

文章页码：761 - 768

关键词：TiN-Ti₅Si₃复合材料； 选区激光熔化； 显微组织

Key words：TiN-Ti₅Si₃ composites； selective laser melting； microstructure

摘    要：利用高能球磨制备了Si₃N₄-Ti(摩尔比1:9)纳米复合粉末,Si₃N₄和Ti平均晶粒尺寸均小于20 nm,之后进行选区激光熔化成型,通过9Ti+Si₃N₄=4TiN+Ti₅Si₃反应生成TiN增强Ti₅Si₃基原位复合材料.延长球磨时间,Si₃N₄-Ti复合粉末颗粒细化且比表面积增加,激光成型的TiN-Ti₅Si₃复合材料致密度可增至97.2%,成型组织中TiN增强相形貌经历多棱角状→近圆形→枝晶状的转变.

Abstract: The selective laser melting (SLM) was used to process the high-energy ball milled Si₃N₄-Ti (mole ratio of 1:9) nanocomposite powder in which the average grain sizes of Si₃N₄ and Ti were both less than 20 nm.The TiN reinforced Ti₅Si₃ matrix in situ composites were prepared by means of the synthesis reaction 9Ti+Si₃N₄=4TiN+Ti₅Si₃.As the milling time increased,the average particle size of the milled Si₃N₄-Ti composite powder decreased and the resultant specific surface area increased.The densification level of laser processed TiN-Ti₅Si₃ composites increased accordingly to 97.2%.The morphologies of TiN reinforcing phase in the corresponding SLM processed structures experienced a successive change from a poly-angular shape to a near-spherical shape and finally to a dendritic shape.