摘要
为了提高硬质颗粒复合合金材料的耐磨性并揭示其与界面结合、微观组织及磨损机理之间的关系,本文设计并通过钎焊法,在普通铸钢件表面制得了厚度可达30mm的WC颗粒增强铜基合金覆层,测试分析了上述各种因素对此覆层耐磨性的影响。力学性能测试表明:该覆层与钢母体结合强固,且具有良好的综合性能。SEM观察和能谱分析说明:复合合金层组织由弥散强化铜基合金基体与WC颗粒相组成,且二者形成了强有力的反应性结合。磨料磨损试验证明:该复合合金在二体和三体磨损条件下均有较高的耐磨性,与低合金钢的切削和犁沟变形应变疲劳以及高铬铸铁的切削磨损机理不同,该复合合金与切削及脆性剥落两大磨损机理相对应。
This paper is focused on improving the interface bonding strength of hard grain phase and copper alloy matrix in the WC particle reinforced composite to raise its wear resistance, and revealing the relationship between the wear resistance and interface binding, the wear resistance and microstructure, and the wear resistance and abrasion mechanism. In the present paper, an effective surface alloying technology called as 'brazing method' was introduced. An abrasion resistant cladding of composite alloy consisted of hard alloy particles and copper brazing alloy matrix was coated on the surface of common steel substrate by this method, and the thickness of this layer was up to 30mm. In addition, the effects of the above-mentioned factors on the wear resistance of the layer were tested and analyzed. Mechanics properties measurements show that the composite alloy cladding is possessed of a stable bonding with steel parent metal and excellent combination properties. Microstructural SEM observation and energy spectrum microanalysis illustrate that the composite alloy is composed of dispersion strengthening copper alloy matrix and granular WC hard phase, and a strong reactive binding is formed between them. The experiments of abradant abrasion prove that the composite alloy has higher wear resistance both under two-body and three-body wear conditions. Different from the cutting and strain fatigue wear of low-alloy steel and from single cutting wear of high-chromium cast iron, the wear forms of the composite alloy mainly behave as the cutting of the copper brazing alloy matrix, hard brittle breaking and shedding of the WC hard phase.
出处
《铸造》
CAS
CSCD
北大核心
2004年第6期419-422,共4页
Foundry
关键词
钎焊法
复合合金覆层
耐磨性
界面结合
磨损机理
brazing process
composite alloy cladding
wear resistance
interface binding
abrasion mechanism
