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摘要: 金刚石微粉表面镀钛能改善其对结合剂的润湿性,镀钛金属层的制备工艺对金刚石微粉的工业应用具有重要意义。通过对比不同钛粉粒径(60目粗粉和325目细粉)和原料配比等因素对金刚石微粉表面真空和保护气氛镀钛工艺的影响。利用XRD表征金刚石微粉表面镀钛的化学成分为金刚石、Ti和TiC过渡层,通过SEM分析镀钛金刚石微粉的形貌及表面元素分布,不同配比和Ti粉粒径均能实现金刚石颗粒表面Ti包覆。细Ti粉包覆金刚石的拉曼光谱含有金刚石和Ti的特征峰,而粗Ti包覆金刚石和真空气氛合成Ti包覆金刚石的拉曼光谱结果受原料配比影响。紫外可见吸收光谱表明Ti包覆金刚石在228-234nm波长区域和328-350nm波长区域分别存在明显的吸收峰。真空合成镀钛金刚石和细颗粒Ti包覆金刚石的失重率低于粗颗粒Ti包覆金刚石的失重率。结合拉曼光谱、紫外吸收光谱和热分析结果,细Ti氩气气氛保护下包覆金刚石性能要优于粗Ti粉包覆金刚石和真空气氛包覆金刚石。
关键词 磨料镀覆技术; 金刚石粉; Ti粉
中图分类号 TQ164; TG74Abstract: Titanium plating on the surface of diamond powder can improve its wettability to the bonding agent, and the preparation process of titanium plated metal layer is of great significance to the industrial application of diamond powder. The effects of different titanium powder particle sizes (60 mesh coarse powder and 325 mesh fine powder) and raw material ratios on the process of vacuum and protective atmosphere titanium plating on the surface of diamond powders were compared. The chemical composition of the titanium coated diamond powder surface was characterized by XRD as diamond, Ti and TiC transition layer, and the morphology of the titanium coated diamond powder and the distribution of surface elements were analyzed by SEM, which showed that Ti coating on the surface of diamond particles could be achieved with different ratios and Ti powder particle sizes. The Raman spectra of fine Ti-coated diamond contain characteristic peaks of diamond and Ti, while the Raman spectra of coarse Ti-coated diamond and Ti-coated diamond synthesized in vacuum atmosphere are affected by the ratio of raw materials. The UV-visible absorption spectra showed that the Ti-coated diamond had obvious absorption peaks in the wavelength region of 228-234 nm and 328-350 nm, respectively. The weight loss rates of vacuum synthesized titanium-coated diamond and fine-grained Ti-coated diamond were lower than those of coarse-grained Ti-coated diamond. Combined with the results of Raman spectroscopy, ultraviolet absorption spectroscopy and thermal analysis, the performance of fine Ti coated diamonds under argon atmosphere protection is better than that of coarse Ti powder coated diamonds and vacuum atmosphere coated diamonds.-
Key words:
- Abrasive Coating Technology /
- Diamond Powder /
- Ti Powder
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