首页|细晶粒硬质合金预处理工艺优化及金刚石涂层性能研究

细晶粒硬质合金预处理工艺优化及金刚石涂层性能研究

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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3 min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(0.2 μm)基体的最佳工艺为 A10+M3+A10 s,WC-6%Co(0.4 μm)基体的最佳工艺为 A6+M3+A30 s,WC-6%Co(1 μm)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(1 μm)基体上的金刚石涂层抗冲刷性能最好.
Optimization of Pretreatment Process of Fine Grained Cemented Carbide and Properties of Diamond Coating
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 0.2,0.4,1.0 μm 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(0.2,0.4,1.0 μm)substrates were determined.The optimal process for WC-6%Co(0.2 μm)substrate was determined as A10+M3+A10 s,the optimal process for WC-6%Co(0.4 μm)substrate as A6+M3+A30 s,and the optimal process for WC-6%Co(1 μm)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(1 μm)substrate.

cemented carbidediamond coatinggrain sizeadhesion strength

王倚倩、苏一凡、张聿铭、张程、林松盛、代明江、孙志鹏、石倩

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广东工业大学材料与能源学院,广东广州 510006

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,广东广州 510651

硬质合金 金刚石涂层 晶粒度 结合力

广东省重点领域研究发展计划广东省特支计划广东省科技攻关计划广东省科技攻关计划

2020B0101850012019BT02C6292022GDASZH-20220101092020GDASYL-20200103109

2024

稀有金属材料与工程
中国有色金属学会,中国材料研究学会,西北有色金属研究院

稀有金属材料与工程

CSTPCD北大核心
影响因子:0.634
ISSN:1002-185X
年,卷(期):2024.53(4)
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