Study on New Method of Pretreatment of CVD Diamond Coated Carbide Substrate

Abstract In this paper, the methanol pretreatment method was used to study the Co-graphitization of Co on the surface of cemented carbide substrate. The methanol pretreatment method was incorporated into the traditional two-step treatment method, and a new two-step pretreatment method was proposed. The surface morphology and composition of the pretreated substrate were analyzed by means of electron microscopy and EDX. A diamond film was successfully deposited on the surface of the pretreated substrate by a bias enhanced hot filament CVD (HFCVD) method. Taking the drill bit as an example, the pretreatment of the complex shape substrate and the preparation of the diamond film were verified by the two-step method. The results show that the methanol pretreatment method can effectively inhibit the adverse effect of Co on diamond film. The new two-step pretreatment method can ensure the adhesion strength between diamond film and substrate, and is very suitable for complex shape monolithic Rotary carbide tools, drawing molds and other substrates have a certain reference for expanding the application of diamond coatings in the field of coating tools. (Diamond and Abrasives Engineering, 2009, Issue 1)

Abstract A methanol pretreating method was proposed to reduce the Co concentration on the surface of WC-Co substrate;also a new two. Step chemical procedure combined with methanol pretreating method was put forward to increase the diamond nucleation density and the adhesion strength between the diamond films and the substrates. High quality diamond films were deposited on such pre-treated substrates by hot filament chemical vapor deposition (HFCVD) method using a mixture of acetone and hydrogen gases. The surface morphologies, nucleation density, diamond films and composition were observed with different techniques. Drilling bits were given as an example to verify the effect of the new two-step chemical procedure on the pretreatment of WC-Co substrate and diamond films. The results showed that the new two-step method increases the diamond nucleation density and enhance the adhesion strength The new two-step chemical procedure is very suitable for complex shaped substrates, such as rotational cutting tools and drawing dies, which may broaden the use of diamond coatings for coated tool applications.

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