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Alloy powder and preparation method thereof

A technology of alloy powder and powder, which is applied in the field of alloy powder and its preparation, can solve the problems of high cost, complex equipment, poor powder activity, etc., and achieve the effect of low cost, low cost and maintenance, and high surface activity

Inactive Publication Date: 2010-06-23
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for producing cobalt-chromium-molybdenum alloy powder include high-temperature atomization method and plasma gun rotating electrode method. and high cost
[0004] The cobalt-chromium-molybdenum alloy powder prepared by high-temperature atomization method and plasma gun rotating electrode method is spherical, which has the advantages of high alloying degree and small component segregation; however, the powder particles are spherical, the surface is bright and the interior is dense, and generally obtained The particle size of the powder is very fine, and it is not easy to make coarse powder particles. The above properties lead to poor powder activity. When using the cobalt-chromium-molybdenum alloy powder prepared by the above method for surface coating, the coating process and technical conditions are demanding. , the implementation is difficult, and the quality and effect of the coating layer are not very good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of alloy powder, preparation method is as follows,

[0022] (1) Weigh 60g of cobalt powder, 34g of chromium powder, and 8g of molybdenum powder. The particle size of the raw materials is less than 300 mesh, and the purity is greater than 99.9%. Stainless steel mixing tank, the mixing time is 30h;

[0023] (2) Press the mixed powder on the hydraulic press to make Blocks with a thickness of about 3mm are put into a sintering furnace for sintering, and the sintering conditions: the vacuum degree is 5×10 -2 Pa, sintering temperature: 820°C, sintering time: 1.5h, after cooling, come out of the furnace, shake and crush, sieve, 100% of the powder passing through the 60-mesh sieve passes through the 90-mesh sieve, and the sieve of the 90-mesh sieve is obtained Cobalt-chromium-molybdenum alloy powder with a yield of 74%.

[0024] The components of the prepared alloy powder and the weight percentage of each component are: cobalt: 60.5%, chromium: 31.4%, and molybdenum:...

Embodiment 2

[0026] A kind of alloy powder, preparation method is as follows,

[0027] (1) Weigh raw materials: cobalt powder: 1980g, chromium powder: 880g, molybdenum powder: 180g, carbon powder: 24g, silicon powder: 18g, raw material particle size is less than 300 mesh, purity greater than 99.9%, put the raw material into the mixer Medium mixing, the mixing tank of the mixing machine is a stainless steel mixing tank, and the mixing time is 40h;

[0028] (2) Put the mixed material powder layer by layer into the sintering furnace for sintering, sintering conditions: vacuum degree: 5×10 -1 Pa, sintering temperature: 760±10°C, sintering time: 1h, out of the furnace after cooling, crushed by vibration, sieved, 100% of the powder passing through the 40 mesh sieve passed through the 80 mesh sieve, and the sieve of the 80 mesh sieve was obtained The cobalt chromium molybdenum alloy powder, the yield is 59%.

[0029] The components of the prepared alloy powder and the weight percentage of each ...

Embodiment 3

[0031] A kind of alloy powder, preparation method is as follows,

[0032] (1) The under-sieve after 80 mesh sieve screening in embodiment 2, analyze the content of each element, wherein cobalt, chromium, molybdenum and silicon adopt chemical analysis, carbon adopts gas instrument analysis, the result is cobalt: 63.3%, chromium : 30.2%, molybdenum: 5.6%, carbon: 0.31%, silicon: 0.59%, take the sieved material after sieving with 80 mesh sieve: 1000g, add cobalt powder: 40g, molybdenum powder: 4g, carbon powder: 2g, silicon Powder: 2g, cobalt powder, molybdenum powder, carbon powder, and silicon powder have a particle size of less than 300 mesh and a purity of more than 99.9%. Put the raw materials into a mixer for mixing, and the mixing tank of the mixer is a stainless steel mixing tank , the mixing time is 48h;

[0033] (2) Put the material powder layered into the sintering furnace for sintering, sintering conditions: vacuum degree 2×10 -2 Pa, sintering temperature: 910±10°C,...

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Abstract

The invention discloses alloy powder and a preparation method thereof, belonging to the technical field of the preparation of alloy powder. The alloy powder comprises the following components by weight percent: 25-95% of cobalt, 4-55% of chromium, 1-15% of molybdenum, 0-2% of carbon and 0-3% of silicon. The preparation method comprises the following steps: weighting raw materials, placing the raw materials in a mixer to mix, then placing the obtained mixture in a sintering furnace to sinter, cooling, discharging, vibrating to crush, and screening twice to obtain cobalt-chromium-molybdenum alloy powder, wherein after screening, raw materials can be added in the screen underflow to prepare the cobalt-chromium-molybdenum alloy powder continuously. The cobalt-chromium-molybdenum alloy powder prepared by the method of the invention has the advantages of irregular shape of granule, high surface activity, low cost and the like and is particularly suitable to be used as the raw material of surface hot spraying. The preparation method does not need the device and mean of high temperature melting, thus the device cost and maintenance cost are lower.

Description

technical field [0001] The invention belongs to the technical field of alloy powder preparation, in particular to an alloy powder and a preparation method thereof. Background technique [0002] Cobalt-chromium-molybdenum alloy has the characteristics of high hardness and high mechanical strength, so once it is prepared into an ingot-like alloy state, it is difficult to powder it at low temperature. [0003] At present, the methods for producing cobalt-chromium-molybdenum alloy powder include high-temperature atomization method and plasma gun rotating electrode method. And the cost is high. [0004] The cobalt-chromium-molybdenum alloy powder prepared by high-temperature atomization method and plasma gun rotating electrode method is spherical, which has the advantages of high alloying degree and small component segregation; however, the powder particles are spherical, the surface is bright and the interior is dense, and generally obtained The particle size of the powder is ...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/04
Inventor 许文江王武育薛红霞
Owner 有研资源环境技术研究院(北京)有限公司
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