摘要
金刚石表面金属化处理是提高金刚石制品性能的重要技术手段之一,镀覆层质量对金刚石及其制品的热稳定性和耐磨性都具有重要影响。采用高温熔盐法在金刚石表面成功镀覆Ti和TiC层,利用XRD、SEM对镀覆层的组成和形貌进行表征,并对镀覆后金刚石颗粒的热稳定性进行研究。结果表明:镀覆后金刚石由黄色变为灰黑色,其光学透过率大大降低。在800~900℃镀覆时,金刚石表面会形成Ti和TiC复合镀层,但800℃时的镀层比较稀疏,甚至出现漏镀现象,而在900℃时得到的镀层比较均匀致密;在1100℃镀覆时,镀覆层为TiC,镀覆层较厚而且出现分层、开裂现象。由于镀覆层的保护作用,金刚石的氧化温度增加,失重率大大降低。尤其是在900℃时镀覆后,金刚石的失重率由原料的91.3%降至镀覆后的9.3%,热稳定性显著提升。因此,熔盐法合成Ti镀覆层的最佳温度为900℃。
The metallization of diamond surface is one of the important methods to improve the properties of diamond products.The quality of the coating has an important influence on the thermal stability of diamond and its products.Ti and TiC layers were successfully coated on the diamond surface by high temperature molten salt method.The composition and morphology of the coated layers were characterized by XRD and SEM,and the thermal stability of the coated diamond particles was studied.The results showed that the colour of the diamond changed from yellow to gray black,and the optical transmittance was greatly reduced after coating.After coating at 800~900℃,Ti-TiC composite layer was formed on the diamond surface.The coating layer was thin and sparse,and some areas were even uncoated at 800℃.While after coating at 900℃,the coating layer became uniform and dense.Increasing temperature to 1100℃,the coating was conveyed to be TiC layer.However,this TiC layer was so thick that delamination and cracking are observed in some areas.Due to the protective effect of the coating layer,the oxidation temperature was increased while the weight loss rate was decreased greatly for diamond particles.Especially for the diamond sample coated at 900℃,its the weight loss rate was decreased from original 91.3% to 9.3% up to 1100℃,showing its thermal stability was significantly improved after coating.Finally,the formation process of the coating layer was discussed,and the effect of temperature on the composition and thermal stability of the coating layer was revealed.
作者
武玺旺
皇甫战彪
刘雪坤
蔡玉乐
王良文
程学瑞
WU Xiwang;HUANGFU Zhanbiao;LIU Xuekun;CAI Yule;WANG Liangwen;CHENG Xuerui(Henan Huanghe Whirlwind Co.,Ltd.,Changge 461500,Henan,China;Xuchang University,Xuchang 461000,Henan,China;College of Physics and Electrical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China;College of Mechanical and Electrical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China)
出处
《金刚石与磨料磨具工程》
CAS
北大核心
2023年第2期196-201,共6页
Diamond & Abrasives Engineering
基金
国家自然科学基金(12104415)
河南省高等学校重点科研项目(21B140011)。
关键词
金刚石
熔盐法
TI
TIC
热重分析
diamond
molten salt
Ti
TiC
thermogravimetric analysis
