chapter  Chapter 24
Selected Communications, Short Notes, and Abstracts
Pages 52

This chapter considers study of the dependence of the formation of the morphology of a diamond film on the surface of carbide plates WC-Co from the nucleation centers of diamond crystallites in the presence of a copper sublayer. Removal of cobalt ligament and forming a copper layer in a surface sublayer carried out by chemical vapor deposition from aqueous solutions of CuSO4. The centers of nucleation of diamond were additionally applied from aqueous suspensions during the formation of a sublayer. It is found that the globular structure of the film formed by using only the copper underlayer, ultradispersed diamonds, and with coprecipitation of diamond/copper. If deposition was carried out after removal of the sublayer, as well as the double layer of copper with a diamond, the diamond film is preferably oriented in the (100) direction. X-ray diffraction analysis and Raman spectroscopy establish the phase composition of the coating obtained. On the X-ray patterns, a diamond reflex is identified at 2Θ 44.0. The Raman spectrum has high luminescence. In the spectrum, a diamond line is identified. Its position is shifted toward large angles when using a diamond/copper sublayer. When using only diamond seeding 302in the direction of smaller angles, in addition to the diamond line, the spectrum contains lines 1150, 1230, 1350, 1500, and 1580 cm−1. According to the shift of the Raman diamond line, the bi-axial stresses arising in the obtained coating are calculated. If only diamonds are used as a seed, tensile stresses of about 1.1 GPa arise in the coating, in other cases, compressive stresses from 1.3 to 2.6 GPa the value of which depends on the method of surface preparation. Keywords

diamond films

tungsten alloy

copper sublayer

diamond powder