爆炸喷涂工艺参数对WC-Co涂层结构和硬度的影响  

Effect of detonation gun spraying technological parameterson structure and hardness of WC-Co coat

作　　者：傅迎庆[1] 郭学平[2] 张立志[2] 丁勇[2] 高阳[1] 

机构地区：[1]大连海事大学船机修造工程实验室,辽宁大连116026 [2]大连海事大学轮机工程学院,辽宁大连116026

出　　处：《大连海事大学学报》2004年第4期60-62,共3页Journal of Dalian Maritime University

摘　　要：为了研究爆炸喷涂过程中爆炸频率、气体流量等喷涂工艺参数对WC Co涂层结构和硬度的影响规律,以钴的质量分数为12%的钴粘结碳化钨粉末YF12为喷涂材料,分别选用4组爆炸喷涂工艺参数来制备WC Co涂层.结果表明,当爆炸频率和氧、乙炔的气体流量较低时,涂层比较粗糙,片层间距较大,气孔较多,硬度较低;随着爆炸频率和气体流量的提高,涂层的层间距变小,气孔率降低,涂层的组织比较致密,硬度有很大提高,维氏硬度HV0.3可以达到1049kg·mm-2;但是当爆炸频率和气体流量进一步升高时,涂层的组织反而恶化,硬度降低.To study the law of effect of technological parameters such as detonation frequency and gas-flow rate on coat's structure and hardness in detonation gun spraying (DGS), WC-Co coats were prepared with Co binding WC powders (12wt.% Co), under the circumstances of 4 different spraying technological parameters respectively. The results indicate that when detonation frequency and gas-flow rates of oxygen(O_2) and ethyne(C_2H_2) were lower, the coat was rough and had lower hardness, and its distance between commutator segments was bigger and porosity was higher; and when increasing detonation frequency and gas-flow rates of O_2 and C_2H_2, the coat was dense and had lower porosity, and its distance between commutator segments became smaller and hardness raised largely that could reach Hv 1049　kg·mm^(-2). However, the further increase in detonation frequency and gas-flow rates caused structure worsening and hardness declining of the coat.

关 键 词：爆炸喷涂 爆炸频率 气体流量 涂层结构/硬度 

分 类 号：TG174.442[金属学及工艺—金属表面处理]