Preparation method for tungsten carbide ceramic/heat-resisting alloy based heat-resisting and wear-resisting composite material

Abstract

The invention discloses a preparation method for a tungsten carbide ceramic/heat-resisting alloy based heat-resisting and wear-resisting composite material. The preparation method comprises the following steps of: manufacturing a reinforcement body of the tungsten carbide ceramic, welding an iron nail to one end of the reinforcement body of the tungsten carbide ceramic; then plating a metal buffer layer on the surface of the reinforcement body of the tungsten carbide ceramic welded with the iron nail, manufacturing an easily-wearing part model; inserting the prepared tungsten carbide ceramics into the easily-wearing part model, keeping the iron nail outwards, casting and shaping by adopting an evaporative pattern casting process, taking out the casting piece and cutting off the iron nail; polishing the working surface by a diamond sand wheel flatly, performing heat treatment on the work piece. The reinforcement phase of the composite material is uniform in distribution, large in controllable range of volume percent, small in interface residual stress, small in hot influence zone and good in combination; the composite material tungsten carbide ceramic with the thickness of 10-15 mm are located at the surface layer of the working surface of the easily-wearing part and can be used for manufacturing the room-temperature or high-temperature heat-resisting and wear-resisting easily-wearing part in mine, building, metallurgy, electricity and other fields.

Description

Technical Field: [0001] The invention belongs to the technical field of alloy material manufacturing, and specifically relates to a preparation method of a tungsten carbide ceramic / heat-resistant alloy-based heat-resistant and wear-resistant composite material. Background technique: [0002] Tungsten carbide ceramics (mainly Co-WC cemented carbide) have a series of excellent properties such as high hardness, wear resistance, heat resistance and corrosion resistance, and are widely used in metal processing, mining and other fields, but tungsten carbide ceramics are expensive to manufacture , The brittleness is relatively large, it is not suitable for the wear parts which are subject to large impact force. In addition, with the rapid development of China’s industry, the application range and amount of tungsten carbide ceramics are increasing year by year. Various scrap tungsten carbide ceramic tools such as drills, milling cutters, reamers, turning tools, etc. The current tungsten...

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Problems solved by technology

[0004] Although some tungsten carbide ceramic / iron-based composite products have been applied in industry and have achieved certain economic benefits, their scope of use is still limited due to the following problems

(1) Due to the great difference in the linear (expansion) coefficients of tungsten carbide ceramics and iron-based alloys, a large residual stress will be generated at the interface. During the subsequent heat treatment and use, the workpiece is easy to crack, especially with tungsten carbide As the volume fraction of ceramics increases, the residual stress also increases accordingly, resulting in frequent cracking of composite materials during preparation, heat treatment and use, and it is impossible to prepare high heat-resistant and wear-resistant composites with high volume fractions (greater than 30%) of reinforcing phases. Material

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