金刚石表面的热爆反应合成涂层

以M(Mn或Cr)/Al/B/Diamond粉体为原料，通过热爆反应技术在金刚石表面生成多元复合涂层，并用X射线衍射仪、扫描电镜结合能谱仪研究2种原料体系及不同Al含量对陶瓷基体和涂层的物相组成和显微形貌的影响。结果表明:在N₂的保护和引爆下，Cr/Al/B/Diamond粉体的热爆反应在金刚石表面形成CrB-AlN基多元复合涂层及Cr₅Al₈和Cr₂AlB₂等副产物；在Ar保护下，Mn/Al/B/Diamond粉体的热爆反应在金刚石表面形成Mn₂AlB₂基复合涂层。2种涂层对金刚石的包裹良好。2种热爆反应由于放热量较小，反应产物难以烧结成块体。制备出的疏松多孔块体易于粉碎和分离，从而可将陶瓷基体与金刚石颗粒分离。 

Thermal explosion reaction synthetic coating on diamond surface

Using M(Mn or Cr)/Al/B/diamond powders as raw materials, the multicomponent composite coatings were formed on the surface of diamond by thermal explosion reaction technology. The effects of two raw material systems and different Al contents on the phase compositions and the microstructures of ceramic matrix and coatings were studied by X-ray diffractometer, scanning electron microscope and energy dispersive spectrometer. The results show that under the protection and detonation of N₂, the thermal explosion reaction of Cr/Al/B/diamond powder forms CrB-AlN based multicomponent composite coating and by-products such as Cr₅Al₈ and Cr₂AlB₂ on the surface of diamond. Under the protection of Ar gas, Mn₂AlB₂ based composite coating is formed on the surface of diamond by thermal explosion reaction of Mn/Al/B/diamond powder. The two coatings wrap diamond well. Due to the small heat release of the two thermal explosion reactions, the reaction products are difficult to sinter into blocks. The prepared loose porous blocks are easy to crush and separate.Therefore, the ceramic matrix can be separated from diamond particles.