钛及钛合金渗硼的研究现状与反应机理

The research status and reaction mechanism of boronizing on titanium and its alloys

钛合金表面渗硼可极大地提高钛合金的耐磨性能.本文综合阐述了国内外钛及其合金表面渗硼的研究现状,探讨了固体渗硼法中表面渗层形成机理与硼钛化合物的生长动力学.基体组织、渗剂组成、渗硼温度、氧分压等因素会影响渗硼层结构.在接近β转变点的温度条件下,可能获得较厚的渗硼层.双相结构中的TiB与TiB2层的厚度d与时间t的关系分别满足Fick扩散第二定律d2=K·t.

Boronizing on the surface of titanium alloys can greatly improve their wear resistance performance.The research status of boronizing on the surface of titanium alloys at home and abroad was summarized in the present paper.The formation mechanism and growth kinetics of titanium compounds in solid boronizing method were discussed.The factors,such as substrate structure,composition of boronizing agent,boronizing temperature,oxygen partial pressure etc,can influence the final structure of the boride layer.A thicker boride layer can be gotten at a temperature close to the β transus temperature.The growth kinetics of TiB and TiB2 layers in the double structure obeys the Fick second diffusion law d2 = K·t.