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用钛熔盐沉积及热处理工艺分别制备碳化钛涂覆的立方碳化硼颗粒(TiN/cBN)及碳化钛涂覆的金刚石颗粒(TiC/金刚石)。将cBN或金刚石颗粒分别与钛粉和KCl、NaCl和K2TiF6熔盐混合。将所得混合物在Ar气氛中加热至900°C,然后在H2气氛中于1000°C进行热处理。采用扫描电镜、X射线衍射和聚焦离子束技术对所制得颗粒进行表征。结果表明:cBN和金刚石颗粒表面已覆盖了纳米钛层。对Ti/cBN和TiC/金刚石涂层颗粒进行热处理后,颗粒表面沉积的Ti层与cBN和金刚石颗粒发生了原位化学反应,分别转化为钛化合物TiN和TiC。
Titanium carbide-coated cubic boron carbide particles (TiN / cBN) and titanium carbide coated diamond particles (TiC / diamond) were respectively prepared by titanium molten salt deposition and heat treatment. The cBN or diamond particles were mixed with the titanium powder and the molten salts of KCl, NaCl and K2TiF6, respectively. The resulting mixture was heated to 900 ° C in an Ar atmosphere and then heat-treated at 1000 ° C in a H2 atmosphere. The prepared particles were characterized by scanning electron microscopy, X-ray diffraction and focused ion beam technique. The results show that the surface of cBN and diamond particles has been covered with nano-titanium layer. After Ti / cBN and TiC / diamond coated particles were heat-treated, the Ti layer deposited on the surface of the particles reacted in situ with the cBN and diamond particles and converted to TiN and TiC, respectively.