氩弧熔敷Ti-Si-C系陶瓷涂层中物相的热力学预测

发布时间：2018-01-23 04:23

  本文关键词： 钨极氩弧熔敷 陶瓷熔覆层 物相 热力学预测　出处：《焊接学报》2017年05期 　论文类型：期刊论文

【摘要】：利用热力学原理推导出反应焓和反应吉布斯(Gibbs)自由能与温度的关系式.根据Ti-Si-C系相图,对用钨极氩弧(TIG)热在钛合金表面熔敷形成涂层过程中可能的12个化学反应进行热力学分析.热力学计算得出,Ti元素能与SiC,Si及C元素反应生成TiC,Ti_3SiC_2相和Ti_5Si_3,TiSi_2金属间化合物.理论分析结果表明,在TIG熔敷条件下,通过改变不同的原材料初始组成,可以采用热力学分析方法预测熔覆层的物相组成.试验结果表明,预测结果与试验结果符合得很好.
[Abstract]:The relationship between the reaction enthalpy and the Gibbs Gibbs free energy and the temperature is derived from the thermodynamic principle. According to the phase diagram of the Ti-Si-C system, the relationship between the reaction enthalpy and the reaction Gibbs free energy is derived. Twelve possible chemical reactions in the process of coating titanium alloy surface by TIG heat were analyzed. The thermodynamic calculation showed that the Ti element could interact with SiC. The reaction of Si and C produces TiCX Ti3SiC2 and Ti5Si3TiSi2 intermetallic compounds. Theoretical analysis shows that under the condition of TIG cladding. The thermodynamic analysis method can be used to predict the phase composition of the cladding by changing the initial composition of different raw materials. The experimental results show that the predicted results are in good agreement with the experimental results.
【作者单位】： 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室;武汉大学动力与机械学院;
【基金】：湖北省教育厅青年基金资助项目(010403)
【分类号】：TG174.4
【正文快照】： 0序言钨极氩弧熔敷方法使用纯度为99.99%的氩气作为保护气体,惰性气体不参与化学反应,使得物质之间的相互作用相对简单一些.孟君晟等人[1]采用了氩弧熔敷技术对钛合金表面改性,原位自生形成Ti C+Ti B2/Ti复合涂层,涂层的显微硬度较基体提高了4.5倍.然而,在电弧熔敷过程中,焊接，

本文编号：1456698