摘要
为了进一步拓展金刚石涂层刀具的产业化应用,提升金刚石涂层刀具的结合力性能,本文开展了细晶粒钨钴类硬质合金的化学预处理研究,考察了三步法预处理工艺对不同WC晶粒大小的基体形貌和成分的影响,实现了金刚石涂层与基体的高结合强度。利用扫描电子显微镜和EDS能谱仪对预处理后基体的表面形貌和钴含量以及涂层形貌进行分析,采用拉曼光谱、X射线衍射光谱对涂层物相结构进行分析表征,并采用固体颗粒冲刷测试间接评价金刚石涂层的抗冲刷性能。结果表明:酸处理对Co的去除起着重要作用,WC晶粒越小所需酸处理的时间越长,碱溶液刻蚀WC的速度呈先上升后下降的趋势,碱处理3min时基体表面暴露的Co含量最多。预处理不仅可以改变基体内部WC和Co的含量,还能改变基体表面的粗糙度,粗糙度的变化与基体表面Co含量的变化规律相一致。由此确定了WC-6%Co(0.2μm)基体的最佳工艺为A10+M3+A10 s,WC-6%Co(0.4μm)基体的最佳工艺为A6+M3+A30 s,WC-6%Co(1μm)基体的最佳工艺为A2+M3+A2。且基体经三步法预处理后沉积的金刚石涂层致密,结晶性较好,抗冲刷性能、结合力性能均优于两步法处理工艺,尤其是WC-6%Co(1μm)基体上的金刚石涂层抗冲刷性能最好。
In order to expand the industrial application of diamond coating tool and improve the adhesive strength of diamond coating tool,the“Acid-Murakami-Acid”(AMA)three-step pretreatment process for cemented carbide with different WC grain size of 0.2,0.4,1.0μm was studied.The surface morphology of the pretreated substrate,cobalt content and coating morphology were analyzed by scanning electron microscope and EDS spectrometer.The phase structure of the coating was analyzed and characterized by Raman spectroscopy and X-ray diffraction spectroscopy.The scour resistance of the diamond coating was tested by dynamic impact experiments.The results show that the acid treatment plays an important role in removing Co.The smaller the grain size of WC,the longer the acid treatment time is required.The etching capacity of WC by Murakami treatment increases at first and then decreases,and the maximum Co exposure is reached at 3 min.Pretreatment can not only change the substrate internal WC and Co content,but also change the roughness of the substrate surface,which is consistent with the change rule of substrate surface Co content.Therefore,the best pretreatment process of WC-6%Co(0.2,0.4,1.0μm)substrates were determined.The optimal process for WC-6%Co(0.2μm)substrate was determined as A10+M3+A10 s,the optimal process for WC-6%Co(0.4μm)substrate as A6+M3+A30 s,and the optimal process for WC-6%Co(1μm)substrate as A2+M3+A2.After the three-step method,the substrates obtain uniform and compact diamond coatings,excellent scouring resistance and great adhesion strength,especially the WC-6%Co(1μm)substrate.
作者
王倚倩
苏一凡
张聿铭
张程
林松盛
代明江
孙志鹏
石倩
Wang Yiqian;Su Yifan;Zhang Yuming;Zhang Cheng;Lin Songsheng;Dai Mingjiang;Sun Zhipeng;Shi Qian(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;National Engineering Laboratory of Modern Materials Surface Engineering Technology,Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510651,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2024年第4期1138-1148,共11页
Rare Metal Materials and Engineering
基金
广东省重点领域研究发展计划(2020B010185001)
广东省特支计划(2019BT02C629)
广东省科技攻关项目(2022GDASZH-2022010109,2020GDASYL-20200103109)。
关键词
硬质合金
金刚石涂层
晶粒度
结合力
cemented carbide
diamond coating
grain size
adhesion strength
