4 results about "Solvent degreasing" patented technology

The application discloses a preparation method of a W-Cu component continuous gradient structure contact and the contact, and specifically comprises the following steps: step 1, W powder and a binder are mixed by using a banbury mixer to obtain feed A, and Cu powder and the binder are mixed by using the banbury mixer to obtain feed B; step 2, the feed A and the feed B are mixed and printed and extruded by using a three-screw double-component single-nozzle 3D printer to obtain a W-Cu component continuous gradient structure composite green body; step 3, the W-Cu component continuous gradient structure composite green body is subjected to solvent degreasing, drying and thermal degreasing to obtain a W-Cu component continuous gradient structure composite degreasing body; step 4, the W-Cu component continuous gradient structure composite degreasing body is sintered to obtain a W-Cu component continuous gradient structure composite material; and step 5, the W-Cu component continuous gradient structure composite material is machined to obtain the W-Cu component continuous gradient structure contact. The W phase and the Cu phase in the contact obtained by the method continuously and gradiently change in composition.

This invention discloses a method for preparing high-density cobalt-free nano-tungsten carbide cemented carbide, belonging to the field of cemented carbide technology. The preparation method includes the following steps: aluminum powder, copper powder, manganese powder, molybdenum powder, and titanium powder are mixed and then subjected to a first ball milling process to obtain high-entropy alloy powder; nano-tungsten carbide powder, high-entropy alloy powder, tantalum carbide powder, vanadium carbide powder, carbon nanotubes, lanthanum oxide, and yttrium oxide are mixed and then subjected to a second ball milling process to obtain composite powder; paraffin wax, stearic acid, ethylene-vinyl acetate copolymer, and low-density polyethylene are mixed to obtain a binder; the composite powder and binder are kneaded to obtain a compound; the compound is extruded to obtain a green body; the green body is subsequently subjected to solvent degreasing and hot degreasing treatments to obtain a degreased green body; the degreased green body is rapidly hot-pressed and sintered to obtain the high-density cobalt-free nano-tungsten carbide cemented carbide. Through the above scheme, this invention prepares a high-density cobalt-free nano-tungsten carbide cemented carbide with good density, hardness, and oxidation resistance.

The invention discloses a high-density cobalt-free nano tungsten carbide hard alloy and a preparation method thereof, and belongs to the technical field of hard alloys. The preparation method comprises the following steps that aluminum powder, copper powder, manganese powder, molybdenum powder and titanium powder are mixed and then subjected to first ball milling treatment, and high-entropy alloy powder is obtained; nano tungsten carbide powder, high-entropy alloy powder, tantalum carbide powder, vanadium carbide powder, carbon nanotubes, lanthanum oxide and yttrium oxide are mixed and then subjected to second ball milling treatment, and composite powder is obtained; paraffin, stearic acid, ethylene-vinyl acetate copolymer and low-density polyethylene are mixed to obtain a binder; mixing the composite powder and a binder to obtain a mixed material, carrying out extrusion molding on the mixed material to obtain a green body, and sequentially carrying out solvent degreasing and thermal degreasing treatment on the green body to obtain a degreased green body; and the degreased blank is subjected to rapid hot pressing sintering, and the high-density cobalt-free nano tungsten carbide hard alloy is obtained. According to the scheme, the high-density cobalt-free nano tungsten carbide hard alloy with good density, hardness and oxidation resistance is prepared.

The invention discloses a W-Cu composite material with a component continuous gradient structure and a preparation method of the W-Cu composite material. The preparation method comprises the following steps: step 1, preparing a feed A and a feed B from W powder with different particle sizes; 2, the feed A and the feed B are added into a three-screw double-component single-nozzle powder extrusion device to be printed and extruded, and continuous gradient structure printing green bodies with different particle size W contents are obtained; 3, the obtained continuous gradient structure printing green bodies with different particle sizes and W contents are sequentially subjected to solvent degreasing, drying and thermal degreasing treatment, and continuous gradient structure degreasing green bodies are obtained; 4, the obtained continuous gradient structure degreased blank is sintered, and a continuous gradient structure sintered blank is obtained; and 5, the obtained continuous gradient structure sintering blank is subjected to copper infiltration treatment, and the W-Cu composite material of the component continuous gradient structure is obtained. By means of the method, the W-Cu composite material of the continuous gradient structure of the components can be prepared, wherein the W-Cu composite material has high surface arc ablation resistance and overall high electric conduction and heat conduction performance at the same time.