Preparation method for diamond particles deposited with WC/W (wolfram carbide/wolfram) composite coating on surfaces

The invention discloses a preparation method for diamond particles deposited with a WC/W (wolfram carbide/wolfram) composite coating on the surfaces. According to the preparation method, the WC/W nano-composite coating is synthesised on the surfaces of the diamond particles by realizing a primary treatment via a dual-cathode plasma sputtering deposition method, and WC in the coating is formed via an interface in-situ reaction between W and the surfaces of the diamond particles during a dual-cathode plasma sputtering deposition process. According to the preparation method disclosed by the invention, the bonding strength and a holding force between the diamond particles and a metal binder, and the compressive strength of the diamond particles are obviously improved. In addition, the WC/W nano-composite coating deposited on the surfaces of the diamond particles has a protective effect on the diamond particles, thus preventing diamond from being oxidized and graphitized during high-temperature sintering and high-temperature grinding processes. The WC/W nano-composite coating in the preparation method disclosed by the invention is mainly suitable for manufacturing a diamond tool by taking a W-Co hard alloy as a matrix, and the diamond tool obtains a high exposure, thus improving the grinding sharpness and the machining efficiency of a grinding tool, and obviously prolonging the service life of the grinding tool.