A kind of bismuth-containing ultrafine copper-based pre-alloyed powder and its preparation method and application

Abstract

A bismuth-containing ultrafine copper-based pre-alloyed powder and its preparation method and application, the powder includes the following components by weight ratio: 7-20% of Sn, 8-30% of Bi, 1-5% of P, and the remaining The amount is Cu, and the preparation method adopts the atomization method, which is applied to the abrasive tools prepared by powder metallurgy, especially the 320-mesh fine diamond grinding block specially used for grinding stone or ceramics. The advantage is that the above-mentioned powder has the characteristics of fine particle size, low sintering temperature, fine structure, high density, low hardness, high brittleness, and easy abrasion and peeling. Therefore, the 320-mesh fine grinding block prepared by it can not only maintain The carcass has sufficient holding force on the diamond, and is easy to wear quickly and self-sharpening, so that the diamond can continue to be edged and the sharpness of the tool can be improved, so that it can replace the magnesite bond or the resin bond in the 320-mesh fine diamond grinding block The application improves the service life, is green and pollution-free.

Description

technical field [0001] The invention relates to the field of metal material powder metallurgy, in particular to a bismuth-containing ultrafine copper-based pre-alloyed powder, a preparation method and application thereof. Background technique [0002] At present, the fine-sized (below 320 mesh) grinding blocks used for grinding and polishing of hard and brittle materials such as ceramics and stone are all resin grinding blocks or magnesite grinding blocks, which have the following disadvantages: the service life is short, and the life span of each group is 2~ 3 hours, frequent replacement is required, the grinding efficiency is low, and the labor cost is high; a large amount of waste water and slag are generated during the grinding and polishing process, which pollutes the environment greatly, and the treatment cost of processing residues is high. Therefore, in these engineering application fields, it is urgent to develop high-efficiency and environmentally friendly grinding...

AI Technical Summary

Problems solved by technology

[0002] At present, the fine-sized (below 320 mesh) grinding blocks used for grinding and polishing of hard and brittle materials such as ceramics and stone are all resin grinding blocks or magnesite grinding blocks, which have the following disadvantages: the service life is short, and the life span of each group is 2~ 3 hours, frequent replacement is required, the grinding efficiency is low, and the labor cost is high; a large amount of waste water and slag are generated during the grinding and polishing process, which pollutes the environment greatly and the treatment cost of processing residues is high

[0003] Due to its advantages of long service life and low pollution, metal bond grinding blocks have also been widely used in the market of coarse grinding blocks (36 mesh to 180 mesh), but the mature metal bond grinding blocks currently on the market can only 180 mesh is used, and a small number of 240 mesh metal bond abrasive blocks for specific materials are also used, but the number is very small, while fine grinding blocks with 320 mesh or more cannot use metal bond, and only resin or diamond with a very short service life can be used. bitter soil binder

[0004] The reason is that the existing metal bond sintered carcass has a contradiction that is difficult to reconcile between the mechanical properties and the wear performance: if the carcass is to have sufficient holding force on the diamond (the carcass has good mechanical properties: high strength), the tire The hardness of the carcass is high (>HRB 70), and the wear resistance is strong, so that the fine-grained diamond cannot be used for cutting or the height of the cutting edge is insufficient, and the grinding block cannot be used because of the lack of grinding force; As a result, the sintered density and strength of the matrix decrease, and the diamond cannot be effectively held and fails

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