Thermal explosion reaction synthetic coating on diamond surface

Abstract

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.

Keywords

• coating
• diamond
• thermal explosion reaction