Preparation method of prealloying matrix powder

A technology of pre-alloying and mixing powder, which is applied in the field of preparation of pre-alloying matrix powder, which can solve the problem of affecting the sharpness and wear resistance of diamond saw blades, the strength and toughness of diamond matrix are not very high, and affecting the service life of diamond saw blades and other problems to achieve the effect of avoiding component segregation, reducing powder molding pressure and good formability

Inactive Publication Date: 2012-09-19
甘肃金川金顶汇新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In cold press forming, due to the high bulk density of the pre-alloyed powder produced by the atomization method and the high forming pressure of the powder, the formability of the powder is not good, and the strength and toughness of the diamond matrix are not very high, which affects the diamond matrix. The sharpness and wear resistance of the saw blade ultimately affect the service life of the diamond saw blade

Method used

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Examples

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Effect test

preparation example Construction

[0020] The embodiment of the present invention discloses a preparation method of pre-alloyed carcass powder, comprising the following steps:

[0021] a) Mix 78wt%~88wt% copper clad iron powder, 5wt%~10wt% nickel powder, 1wt%~5wt% zinc powder, 5wt%~8wt% tin powder and 0.5wt%~1.5wt% cobalt The powder is mixed to obtain a mixed powder;

[0022] b) heating the mixed powder in three zones of the reduction furnace in sequence, the temperature of the first zone is 550°C~570°C, the temperature of the second zone is 600°C~620°C, the temperature of the third zone is 570°C~590°C, get a sintered block;

[0023] c) crushing and screening the sintered block to obtain diamond pre-alloyed matrix powder.

[0024] Step a) is a process of mixing copper-clad iron powder, nickel powder, zinc powder, tin powder and cobalt powder. The particle size of the copper-clad iron powder is preferably 45um-75um, and a lower particle size ensures a finer particle size of the mixed powder. The content of c...

Embodiment 1

[0029] a) By weight, mix 83% copper-clad iron powder, 7% tin powder, 6% nickel powder, 3% zinc powder, and 1% cobalt powder with a V-shaped mixer for 1 hour to obtain a mixture powder, the particle size of the copper-clad iron powder is 75 microns, the copper content in the copper-clad iron powder is 35wt% of the copper-clad iron powder, and the iron content is 65wt% of the copper-clad iron powder;

[0030] b) Put the mixed powder in a mesh belt reduction furnace with ammonia decomposition gas for diffusion sintering, diffusion temperature: 560°C in the first zone, 610°C in the second zone, 580°C in the third zone, and the gas velocity of hydrogen is 5m 3 / h, the gas velocity of nitrogen is 10m 3 / h, the net speed of the reduction furnace is 18Hz, and the sintered block is obtained;

[0031] c) The sintered block is crushed with a pulverizer, and then sieved into 200-mesh pre-alloyed matrix powder with a vibrating sieve machine.

[0032] The pre-alloyed carcass powder is tes...

Embodiment 2

[0034] a) By weight, mix 88% copper-clad iron powder, 5% tin powder, 5% nickel powder, 1% zinc powder, and 1% cobalt powder with a V-shaped mixer for 0.5 hours to obtain a mixture Powder, the granularity of copper clad iron powder is 75 microns, and in described copper clad iron powder, copper content is 28wt% of copper clad iron powder, and iron content is 72wt% of copper clad iron powder;

[0035] b) Put the mixed powder in a mesh belt reduction furnace with ammonia decomposition gas for diffusion sintering. Diffusion temperature: 550°C in the first zone, 600°C in the second zone, 570°C in the third zone, and the gas velocity of hydrogen is 5m 3 / h, the gas velocity of nitrogen is 10m 3 / h, the net speed of the reduction furnace is 18Hz, and the sintered block is obtained;

[0036]c) The sintered block is crushed with a pulverizer, and then sieved into 300-mesh powder with a vibrating sieve to obtain a pre-alloyed matrix powder.

[0037] The pre-alloyed carcass powder is t...

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Abstract

The invention provides a preparation method of prealloying matrix powder. The preparation method comprises the following steps of: (a) mixing copper-clad iron powder, nickel powder, zinc powder, tin powder and cobalt powder to obtain mixed powder; (b) heating the mixed powder in three areas of a reducing furnace sequentially to obtain lump sinters, wherein the temperature of the first area is 550 DEG C-570 DEG C, the temperature of the second area is 600 DEG C-620 DEG C, and the temperature of the third area is 570 DEG C-590 DEG C; and (c) crushing and sieving the lump sinters to obtain the prealloying metal body powder. According to the method, the mixed powder is temperature-control heated in the three areas sequentially so as to be sintered, in the sintering process, the uniform prealloying matrix powder is obtained, and the apparent density of the prealloying metal body powder is reduced, so that the moulding pressure of the powder is reduced, and the prealloying metal body powder has better mouldability.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a method for preparing prealloyed carcass powder. Background technique [0002] Diamond saw is a cutting tool widely used in processing hard and brittle materials such as stone and ceramics. With the increasing demand for diamond saws, people have higher and higher requirements for the quality of diamond saw blades. The diamond saw blade is mainly composed of two parts: the substrate and the cutter head. The substrate is the main supporting part of the bonded cutter head, and the cutter head is the part that cuts during use. The diamond saw blade will be continuously consumed during use, so the service life of the diamond saw blade directly depends on the performance of the saw blade. [0003] At present, the production of diamond saw blades mainly adopts powder metallurgy method, that is, mixing diamond abrasive grains and metal powder, and sintering by cold pressing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C1/04B22F9/04
Inventor 谭兴龙戴煜
Owner 甘肃金川金顶汇新材料科技有限公司
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