中国铸造2006，Vol.3Issue(2)：108-112,5.
Microstructure and bonding strength of Ni based alloy coating
Microstructure and bonding strength of Ni based alloy coating
摘要
Abstract
A Ni-Cr-B-Si coating technique was developed and successfully applied on austenite grey iron substrate in a conventional resistance furnace under graphite powder protection. The microstructure, phase distribution, chemical composition profile and microhardness along the coating layer depth were investigated. Shear strength of the coating was also tested. Microanalysis shows that the coating is consist of γ-Ni solution and γ-Ni+Ni3B lamellar eutectic, as well as small amount of Cr5B3 particles. Diffusion induced metallurgical bonding occurs at the coating/substrate interfaces, and the higher the temperature, the more sufficient elements diffused, the broader interfusion region and the larger bonding strength, but it has an optimum value. And the bonding strength at the interface can be enable to reach 250-270 MPa, which is nearly the same as that of processed by flame spray. The microhardness along the coating layer depth shows a gradient distribution manner.关键词
composite coating/austenite grey iron/Ni-based self-fluxing alloy powder/diffusion/bonding strengthKey words
composite coating/austenite grey iron/Ni-based self-fluxing alloy powder/diffusion/bonding strength分类
矿业与冶金引用本文复制引用
LIU Qing,SHAO Wen-bao,WU Chun-jing..Microstructure and bonding strength of Ni based alloy coating[J].中国铸造,2006,3(2):108-112,5.基金项目
The paper is supported by country-level Spark Plan in 2003,project No.: 2003EA690034. （）
