铸造碳化钨添加量对镍基复合喷熔涂层性能的影响.pdf

造
Sep.2013
874
FOUNDRY
Vol.62 No 9
铸造碳化钨添加量对镍基复合喷嫆凃层性能的影响
吴有伍,谭兴龙,吴琴,章诗歧3
(1.湖南大学材料科学与エ程学院,湖南长沙410082;2.湖南顶立科技有限公司,湖南长シ341000;
3.无锡福莱达石油机械有限公司,湖南长沙341000)
摘要:在镍基合金粉末 NICRBSIE中添加不同比例的铸造碳化钨(WC),并采用氧乙炔火焰喷熔工艺在低碳钢表面制
备了相应的N基WC复合涂层。采用金相显微镜观察了涂层的显微组织,采用湿砂橡胶轮式磨粒磨损试验机測试了
涂层的抗蘑粒磨损性能,并采用扫描电镜观察了喷熔粉末和喷嫆层磨损后的形貌。结果表明:喷熔层的组织为在
NiCr合金基体上弥散分布着不同粒度的碳(硼)化物硬质相;涂层的显微组织和WC的含量对Ni基WC喷熔层的硬度
和抗磨损性能影响很大,涂层的硬度和抗蘑损性能随C添加量的增加先增加后减小;当WC的含量为35%时,Ni基
体C喷熔凃层的硬度最高,相应的抗磨粒磨损性能最好。
关键词:磨粒磨损;喷熔;凃层;镍基自熔性合金;碳化钨
中图分类号:TG146.1文献标识码:A文章编号:1001-4977(2013)09-0874-04
Effect of the Casting WC Powder Content on the Performance
of WC Reinforced Ni-based Spray-fused Coating
WU You-wu, TAN Xing-long, WU Qin, ZHANG Shi-qi
(1. College of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan, China;
2. Advanced Corporation for Materials &Equipments Co, Ltd, Changsha 410082, Hunan, China
3. Wuxi Fulaida Petroleum Machinery Co, Ltd Wuxi 214192, Jiangsu, China)
Abstract: Ni-based NICRBSI self-fluxing alloy composite coatings with different content of casting WC were
prepared by oxy-acetylene flame spray-fuesed process. Cross-sectional microstructures of these coatings were
investigated by optics microscope(OM)and their wear behaviors were explored by a MIS-225 wet sand rubber
wheel abrasive wearing tester. The micrograph of the powder and the worn surfaces of the coatings were
examined by scanning electron microscopy(SEM ) The results show that the microstructures of the spray-fused
coating are composed of Nicr alloy, carbides and borides. The hardness and wear resistance of the spray-fused
Ni-based WC coatings were greatly influenced by their microstructure and WC content. The hardness and wear
resistance of the coatings firstly increased and then decreased with the WC content increase, the coating with
casting WC content of% exhibited the highest hardness and abrasive wear resistance
Key words: abrasive wear; spray-fused; coating; Ni-based self-fluxing alloy; WC
采用氧乙炔火焰喷熔金属复合涂层具有操作工艺时,涂层的耐磨性最好;而文献[]则报道 NICRBSI粉末
简单、成本低且涂层与基体能形成冶金结合等特点,中的亚微米WC体积添加量为1%6时,涂层的综合性能
在生产实际中得到了广泛的应用啊。氧乙炔火焰喷熔最好。关于铸造WC在 Nicrbsi粉末中的添加量相关的
常用的材料有铁基、钴基和镍基材料,当前生产实践报道也不尽相同。文献[5]报道了Ni60中WC的添加量
中普遍采用 Nicrbsi为代表的镍基合金粉末制备喷熔涂为25%~35%时,相应的喷熔凃层的抗黁损性能提高4
层作为材料表面的防护层。当喷熔涂层硬度要求不高倍以上。文献[]报道了Ni60中WC添加量为309%时,涂
时,可以选用Cr含量较低的Ni基合金粉末;当喷熔淰层的硬度最高,当WC添加量为35%时,涂层的耐磨性
层需要高硬度来承受高磨粒磨损的情况下,则必须选能最好。还有文献[?报道添加WC的质量分数为50%时
用含Cr量较高的Ni基合金粉末或者在此基础上添加不制备的i基喷熔涂层的耐磨性能相对于N60涂层提高9
同比例的WC构成的镍(Ni)碳化钨(WC)复合材料。倍这些报道中,关于WC的最优的添加比例存在差异
Ni基WC粉末中WC的粒度和添加比例对相应的喷熔凃可能与涂层制备工艺水平和所采用的抗磨损性能的评
层的性能都有很大的影响。文献[3]报道在湿砂磨粒磨价方法有关。关于铸造WC的添加量对基喷熔涂层的
损条件下,粒度为1Wm细颗粒WC的质量分数为25%显微组织特别是对Ni基WC的磨粒磨掼行为和相关机理
收稿日期:2013-04-26收到初稿、2013-06-03收到修订稿。
作者简介:吴有伍(1961-),男,高级工程师,主要从事材料加工与成形研究。F-mail:wyu6l@126.cm