Wolfram carbide-cobalt-carbon composite powder for hot spraying and preparation method thereof

Abstract

The invention relates to a wolfram carbide-cobalt-carbon composite powder for hot spraying and a preparation method thereof. The invention is characterized in that the composite powder contains simple substance carbon, and is composed of the following components in percentage by weight: 5-30% of Co, 60-90% of WC, 1-10% of C, 0-20% of Fe and 0-20% of Cr. The preparation method comprises the following steps: proportionally and directly mixing graphite powder used as a carbon source with other powder components, carrying out ball milling or high-energy ball milling mechanical alloying under the protection of absolute alcohol, kerosene or any other organic solvent, drying, and screening to obtain the composite powder. The invention can also comprise the following steps: by using an organic compound (such as glucose) as a carbon source, proportionally and directly mixing powdered glucose with other powder components, carrying out ball milling under the protection of absolute alcohol, kerosene or any other organic solvent, drying at 60-80 DEG C, carbonizing in a vacuum furnace at 400 DEG C below, carrying out ball milling or high-energy ball milling mechanical alloying, and screening to obtain the composite powder.

Description

technical field [0001] The invention relates to a tungsten carbide-cobalt cermet powder for thermal spraying, in particular to a tungsten carbide-cobalt series thermal spraying cermet powder containing elemental carbon that can inhibit tungsten carbide phase oxidation decomposition and decarburization, and belongs to the technical field of thermal spraying. Background technique [0002] Thermal sprayed WC-Co coating has excellent anti-wear properties. At present, the commonly used WC-Co composite powder is composed of WC, Co, Cr2C3 and other alloy powders. This kind of composite powder has oxidation decomposition and decarburization of WC phase in the thermal spraying process, which affects its hardness and wear resistance. Therefore, , Inhibiting the oxidative decomposition and decarburization of WC—Co in the thermal spraying process is an important issue to improve its coating performance. Contents of the invention [0003] The purpose of the present invention is to ove...

AI Technical Summary

Problems solved by technology

At present, the commonly used WC-Co composite powder is composed of WC, Co, Cr2C3 and other alloy powders. During the thermal spraying process, this kind of composite powder has the phenomenon of oxidative decomposition and decarburization of WC phase, which affects its hardness and anti-wear performance. , inhibiting the oxidative decomposition and decarburization of WC—Co in the thermal spraying process is an important issue to improve its coating performance