摘要
采用铸造反应合成技术制备出TiC/Ni3Al表面复合涂层材料,研究了涂层的物相、组织和界面形态,测试了涂层的硬度和耐磨性。结果表明:Ti-C-3Ni-Al体系反应完全,产物为TiC和Ni3Al。表面复合涂层中直径为1～3μm的TiC颗粒呈球形镶嵌在Ni3Al基体上,随着TiC含量的提高,颗粒尺寸略有长大、分布更均匀、涂层更致密,且涂层与钢基体界面为良好的冶金结合,随TiC含量的变化而界面呈现出不同的形貌,在TiC含量<45%时,涂层为一整体,从涂层到界面处Ni、Al、Ti、Fe元素呈梯度变化;在TiC含量≥45%时,涂层出现了分层现象。随着涂层中TiC含量的增高,材料的硬度和耐磨性提高,表面复合涂层的硬度和耐磨性均明显高于钢基体。
A TiC/Ni3Al surface coating was fabricated on the steel substrate by casting and reaction synthesis. The phases, microstructure and interface morphology of the coating were studied, the hardness and wear resistance were measured as well. The results show that the reaction of Ti-C- 3Ni-Al system is fully completed with the products of TiC and Ni3Al. TiC particulates 1 -3 μm in diameter are mounted in Ni3Al matrix. With increase of TiC, TiC particulates have slight growth, which are distributed more uniformly, and the coating is much denser. The interface between the coating and steel substrate has good metallurgical bonding. Interface morphology is varied with the TiC content of the coating. When the content of TiC is less than 45wt%, the coating is integrated with a gradient distribution of Ni, Al, Ti, Fe from the coating to the interface. When content of TiC is equal to or more than 45wt%, the coating is delaminated. The hardness and wear resistance of the thermal resistant surface composite coatings increase with increasing TiC content, which are substantially higher than those of the cast steel.
出处
《铸造技术》
CAS
北大核心
2007年第6期779-783,共5页
Foundry Technology
基金
江苏大学高级人才启动基金(1283000058)
江苏省高校省重点实验室开放项目(Kjsmcx04004)
