TIG熔敷Ti-Si-C系统在Ti-5Al-2.5Sn表面形成陶瓷涂层的化学反应分析

闫文青; 桂赤斌; 戴乐

TIG熔敷Ti-Si-C系统在Ti-5Al-2.5Sn表面形成陶瓷涂层的化学反应分析

1.
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 4300813;华南理工大学机械与汽车工程学院, 广州 510641
2.
华南理工大学机械与汽车工程学院, 广州 510641
3.
河南柴油机集团有限责任公司407厂, 洛阳 471039

基金项目: 湖北省教育厅资助项目(010403)

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- 收稿日期: 2013-03-31

Chemical reaction of ceramic coatings of Ti-Si-C system on Ti-5Al-2.5Sn substrate prepared by tungsten inert-gas arc cladding

1.
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
2.
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
3.
Military Representative Office of Navy, Henan Diesel Engine Group Limited Company 407 Factory, Luoyang 471039, China

摘要

摘要: 采用TIG热源在钛合金表面堆焊Ti-SiC和Ti-SiC-C两种体系的粉末,形成表面陶瓷涂层.利用SEM和XRD等分析手段对两种配方陶瓷涂层的微观组织和物相进行了分析,用热力学方法计算了两种系统中各种可能发生的化学反应的Gibbs自由能变化.结果表明,Ti-SiC系统熔敷层的微观组织主要由树枝状的TiC、针棒状和菊花状的Ti₅Si₃相组成,其反应机理为:8Ti+3SiC→3TiC+Ti₅Si₃.Ti-SiC-C系统熔敷层的微观组织除了树枝状的TiC相之外,还有TiSi₂和Ti₃SiC₂,其反应机理为:6Ti+3SiC+C→Ti₃SiC₂+TiSi₂+2TiC.通过对两种系统的微观组织及化学反应分析可得出,在Ti-SiC系统中适当的添加石墨,可生成具有自润滑性能的Ti₃SiC₂相,避免Ti₅Si₃脆性相的生成.
- 钨极氩弧焊熔敷 /
- 陶瓷涂层 /
- 反应机理 /
- 热力学分析
Abstract: The surface ceramic coatings were prepared on Ti-5Al-2.5Sn substrate by tungsten inert-gas arc depositon process. The microstructures and phases were analyzed using the method of SEM and XRD for the cladding coatings of Ti-SiC and Ti-SiC-C systems. Moreover, the changes of Gibbs energy for possible reactions in systems were calculated using thermodynamic analysis. The results shows that the main microstructure are composed with dendritic TiC and needle-shaped or chrysanthemum Ti₅Si₃ in the cladding coating of Ti-SiC system, the reaction mechanism is 8Ti+3SiC→3TiC+Ti₅Si₃. However, in Ti-SiC-C system, there are TiSi₂ and Ti₃SiC₂ hybrid microstructure observed besides TiC. 6Ti+3SiC+C→Ti₃SiC₂+TiSi₂+2TiC is the main reaction mechanism. In addition, the addition of graphite in Ti-SiC system favors to the generation of self-lubricating Ti₃SiC₂ phases, while the brittle Ti₅Si₃ phases are avoided.
- tungsten inert-gas arc cladding /
- ceramic coating /
- reaction mechanism /
- thermodynamic analysis

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文章访问数: 252
HTML全文浏览量: 6
PDF下载量: 135
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TIG熔敷Ti-Si-C系统在Ti-5Al-2.5Sn表面形成陶瓷涂层的化学反应分析

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Chemical reaction of ceramic coatings of Ti-Si-C system on Ti-5Al-2.5Sn substrate prepared by tungsten inert-gas arc cladding

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其他类型引用(3)

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