Cr/Al/B/diamond体系中金刚石表面的热爆反应涂层  

Thermal explosion reaction coating on diamond surface of Cr/Al/B/diamond system

作　　者：韩警贤 刘嘉霖 HAN Jingxian;LIU Jialin(Department of Mechanical Engineering,Zhengzhou Technical College,Zhengzhou 450010,China;Institute of Electrical and Mechanical,Zhongyuan University of Technology,Zhengzhou 450007,China)

机构地区：[1]郑州职业技术学院机械工程系,郑州450010 [2]中原工学院机电学院,郑州450007

出　　处：《金刚石与磨料磨具工程》2022年第6期692-698,共7页Diamond & Abrasives Engineering

基　　金：国家自然科学基金(51864028);河南省科技攻关项目(212102210465)。

摘　　要：采用Cr/Al/B/diamond粉体为原料,并添加少量Cr2O3或B2O3以诱发热爆反应。结果表明:在高纯Ar保护下,热爆反应后的试样粉末化严重,易将结合剂与金刚石颗粒分离。添加Cr2O3的原料体系发生热爆反应后,结合剂中的主相为Cr2AlB2,金刚石表面会形成含Cr3C2和Al的复合涂层,涂层的晶粒大小为0.5~7.0μm。当金刚石质量分数为10%和20%时,试样中的金刚石颗粒表面涂覆良好,其起始和终止氧化温度都显著高于未涂覆金刚石的;而在金刚石质量分数较高时,其表面涂覆效果略差。添加B2O3的原料体系发生热爆反应后,金刚石表面的涂覆效果不佳,只有半数或以下数量的金刚石颗粒被涂覆。Cr/Al/B/diamond powder was used as raw material, and a small amount of Cr2O3or B2O3was added to induce thermal explosion reaction. The results show that under the protection of high-purity Ar, the sample after thermal explosion reaction is seriously powdered, and it is easy to separate the binder from the diamond particles. After the thermal explosion reaction of the raw material system added with Cr2O3, the main phase in the binder is Cr2AlB2, and the composite coating containing Cr3C2and Al will be formed on the diamond surface. The grain size of the composite coating is 0.5~7.0 μm. When the mass fractions of diamond are 10% and 20%, the surface of diamond particles in the samples are well coated, and the initial and the final oxidation temperatures of coated diamond are significantly higher than that of uncoated diamond. However, when the mass fraction of diamond is high, the coating effect on the diamond surface is slightly poor. After the thermal explosion reaction of the raw material system added with B2O3, the coating effect on the diamond surface is poor, and only half or less of the diamond particles are coated.

关 键 词：热爆反应 金刚石颗粒 涂层 抗氧化性 

分 类 号：TQ164[化学工程—高温制品工业]