High-strength hard alloy with titanium carbide as main component and preparation method of high-strength hard alloy

Abstract

The invention discloses a high-strength hard alloy with titanium carbide as a main component and a preparation method of the high-strength hard alloy. The titanium carbide serves as a main material, part of tungsten carbide is added as a hard phase, the titanium carbide and the tungsten carbide are mixed with a cobalt and nickel mixture serving as a binding phase, and the high-strength hard alloy with the titanium carbide as the main component is manufactured. The high-strength hard alloy with the titanium carbide as the main component is prepared from, by weight, 55-70 parts of titanium carbide, 20-45 parts of tungsten carbide, 0-5 parts of cobalt, 8-20 parts of nickel, 0-5 parts of molybdenum and 0.01-0.5 part of vanadium carbide. Firstly, the titanium carbide and the tungsten carbide are mixed into solid solutions, the molybdenum (Mo) is added in the manufacturing process of the solid solutions, the metal molybdenum changes into molybdenum carbide in the manufacturing process of the solid solutions, wettability of the binding phase on the hard phase is improved, the titanium carbide and tungsten carbide solid solutions are mixed with the binding phase and trace element vanadium carbide, and a mixed material is made; and the glue joining of the mixed material, pressing and forming are performed, and finally sintering and forming are performed.

Description

technical field [0001] The invention relates to a powder metallurgy product and a preparation method thereof, in particular to a high-strength hard alloy mainly composed of titanium carbide and a preparation method thereof. It belongs to the technical field of powder metallurgy manufacturing. Background technique: [0002] Conventional cemented carbide mainly uses tungsten carbide as the hard phase and cobalt-nickel as the binder phase, such as YG cemented carbide. Some increase the hardness of the alloy and improve its wear resistance by adding a small amount of TiC, such as YT cemented carbide. However, the addition of TiC decreases the strength of the alloy while increasing the hardness of the alloy. For example, the YT30 alloy has a TiC content of 30%, and its strength drops below 1000MPa, which is rarely used at present. TiC-containing alloy grades widely used in industrial production, such as YT5, YT14, YW, etc., the content of TiC is between 5-15%, and the strength...

AI Technical Summary

Problems solved by technology

[0010] Although the above-mentioned patents all relate to titanium carbide-based hard-phase cemented carbides, which also involve the improvement of some titanium carbide-based hard-phase cemented carbides, the production of these hard alloys is to directly combine the bonding phase and hard-phase cemented carbide. The hard phase material is pressed and sintered after being mixed mechanically, but it is found in the actual application process that it is difficult to change the adhesion between titanium carbide and the binder phase, and the wettability of the bond relative to the hard phase The toughness is not very good, so the produced hard alloy, or the hardness meets the requirements, but the brittleness increases, and the strength does not meet the requirements; or the hardness does not meet the requirements, so now the general titanium carbide-based cemented carbide Generally, the strength can only be about 1600MPa, which cannot meet the requirements of many existing cemented carbides, so it is still necessary to improve