热爆反应在金刚石表面快速形成TiC涂层  

Rapid formation of TiC coating on diamond surface through thermal explosion reaction

作　　者：史冬丽 马尧 李涛 SHI Dongli;MA Yao;LI Tao(Zhengzhou Bolisen New Material Technology Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]郑州伯利森新材料科技有限公司,郑州450001

出　　处：《金刚石与磨料磨具工程》2024年第4期463-469,共7页Diamond & Abrasives Engineering

摘　　要：分别采用Ti/碳黑/diamond和Ti/碳黑/PTFE/diamond粉体为原料,通过热爆反应在金刚石颗粒表面形成以TiC为主的涂层,研究原料中金刚石含量及添加PTFE对金刚石表面TiC涂层的影响。结果表明:2种体系的原料热爆反应后基体的组成为TiC。Ti/碳黑/diamond体系中,当原料中金刚石质量分数为10%~30%时,反应后的金刚石表面均实现良好的TiC涂层涂覆。在Ti/碳黑/PTFE/diamond体系中,当原料中添加质量分数为3%的PTFE并减少原料中碳黑的质量分数时,可明显促进金刚石表面的TiC涂覆;且当原料中金刚石质量分数为80%~90%时,仍可使金刚石颗粒表面实现良好的TiC涂覆。Objectives:Coating treatment on the surface of diamond particles is an important technique to effectively overcome the problem of difficult bonding between diamond and substrate,and the thermal explosion reaction is a com-mon surface coating technique for diamond particles.However,this technology has disadvantages such as difficulty in separating diamonds from the product and a low proportion of diamonds,which increases its complexity and production costs,greatly limiting the promotion and application of this technology.This article aims to introduce polytetrafluoro-ethylene(PTFE)into thermal explosion reaction technology to form a coating mainly composed of TiC on the surface of diamond particles.It is expected to optimize the coating preparation process and promote the popularization and applica-tion of thermal explosion reaction technology in the field of diamond plating,so as to improve the wear resistance and service life of the diamond tools.Methods:Using two raw material systems,Ti/carbon black/diamond and Ti/carbon black/PTFE/diamond powders,the thermal explosion reaction of Ti/carbon black/diamond is induced by the chemical furnace method,and the intense chemical reaction between PTFE and titanium at low temperature ensures that the Ti/carbon black/PTFE/diamond system directly undergoes a thermal explosion reaction.At the same time,the TiC coat-ing can be generated on the surface of diamond particles by adjusting the ratio of raw materials and triggering the thermal explosion reaction under high temperature conditions.The macroscopic morphology of diamond particles be-fore and after coating is observed and compared by optical microscope to roughly infer the plating condition,and the phase compositions of the coating were analyzed by X-ray diffraction.Then the scanning electron microscope and the energy dispersive spectroscopy are used to observe the surface morphology of diamond particles,determine the element-al compositions,and infer the surface reaction state.Results:The thermal explosion reaction of

关 键 词：Ti-TiC涂层 金刚石 热爆反应 PTFE 

分 类 号：TQ164[化学工程—高温制品工业]