化学复合镀Ni-Mo-P/(h)BN镀层的宽温域摩擦学性能研究  

Tribological Properties of Electroless Ni-Mo-P/(h)BN Composite Coatings in Wide Temperature Range

作　　者：夏雨 韦春贝 林松盛 向青春[1] 石倩 Xia Yu;Wei Chunbei;Lin Songsheng;Xiang Qingchun;Shi Qian(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;National Engineering Laboratory of Modern Materials Surface Engineering Technology,Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology,Guangdong-Hong Kong Joint Laboratory of Modern Surface Engineering Technology,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510651,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]广东省科学院新材料研究所现代材料表面工程技术国家工程实验室广东省现代表面工程技术重点实验室粤港现代表面工程技术联合实验室,广东广州510651

出　　处：《稀有金属材料与工程》2024年第10期2860-2872,共13页Rare Metal Materials and Engineering

基　　金：广东省基础与应用基础研究基金(2024A1515010753);广东省科技计划项目(2023B1212060045)。

摘　　要：在GH4169镍基高温合金表面采用化学复合镀技术制备了Ni-Mo-P镀层和Ni-Mo-P/(h)BN复合镀层,研究了镀层在不同温度下摩擦磨损后的摩擦学行为以及微观组织结构。采用球-盘式摩擦磨损试验机研究了镀层在室温、300、500、700℃下的摩擦学性能。通过扫描电镜、能谱仪、X射线衍射仪对不同温度摩擦试验后镀层的化学成分、组织结构进行分析。利用显微硬度计、洛氏压痕仪对不同温度摩擦试验后镀层的力学性能进行表征。结果表明:沉积态Ni-Mo-P镀层和Ni-Mo-P/(h)BN复合镀层以非晶为主,同时包含少量纳米晶结构,镀层表面结构致密。随着摩擦试验温度的增加,镀层逐渐从非晶结构向纳米晶结构转变,镀层结晶度增加;当温度增加至500℃以上时,镀层内析出Ni3P硬质相,同时由于Mo、P元素的氧化挥发导致镀层内出现了孔洞,镀层致密度下降。随温度增加,镀层硬度呈先升高后降低趋势,膜基结合力从HF1级逐渐降低至HF6级。随着试验温度增加,摩擦系数和磨损率均呈先升高后降低趋势,在300℃时摩擦系数最高;在室温至500℃范围,镀层磨粒磨损和氧化现象随温度升高逐渐加剧,在500℃时磨损率最高;进一步增加温度使得摩擦界面具有较好的润滑效果,提高了镀层在高温下的减摩耐磨性能。添加(h)BN颗粒提高了镀层内P含量,使得Ni-Mo-P/(h)BN复合镀层韧性增加,提高了复合镀层的硬度和膜基结合力,复合镀层在室温~700℃范围内具有较好的耐磨性能。Ni-Mo-P coating and Ni-Mo-P/(h)BN composite coating were prepared on the surface of GH4169 nickel-based superalloy by electroless composite plating technique.The tribological behaviour and microstructure of the coatings after friction wear test at different temperatures were investigated.The tribological properties of the coatings at room temperature,300,500 and 700℃were investigated by ball-disc friction and wear test machine.The chemical composition and microstructure of the coatings after friction wear test at different temperatures were analyzed by scanning electron microscope,energy spectrometer and X-ray diffractometer.The mechanical properties of the coatings after friction wear test at different temperatures were characterized by microhardness tester and Rockwell indentation tester.The results show that the deposited Ni-Mo-P coating and Ni-Mo-P/(h)BN composite coating are predominantly amorphous structure containing a small amount of nanocrystalline,and the surface of the coatings is dense.The coatings transform from amorphous to nanocrystalline structure with the increase in the temperature of friction wear test.As the temperature increases,the coatings undergo a transformation from amorphous to nanocrystalline structure,accompanied by an increase in crystallinity.When the temperature increases above 500℃,the precipitation of Ni3P hard phase in the coatings occurs,and the oxidative volatilisation of the Mo and P elements results in the formation of pores within the coating and reduction in its density.As the temperature increases,the hardness of the coatings exhibits a fluctuating trend,initially rising and then declining.Concurrently,the adhesion strength between the film and substrate exhibits a gradual decline,progressing from HF1 grade to HF6 grade.With the increase in test temperature,the coefficient of friction and wear rate are both increased first and then decreased,and the highest coefficient of friction is observed at 300℃.In the range of room temperature to 500℃,the wear and oxidation

关 键 词：Ni-Mo-P/(h)BN复合镀层 组织结构 硬度 膜基结合力 宽温域摩擦学性能 

分 类 号：TG174.441[金属学及工艺—金属表面处理] TH117[金属学及工艺—金属学]