Copper alloy coated composite powder and its preparation method

A copper alloy and coating powder technology, which is applied in the field of composite metal powder preparation, can solve the problems of large sintering shrinkage, easy segregation in mixing, increasing shrinkage and deformation of oil-impregnated bearing pressed products, and achieve uniform coating Dense, reasonable particle size distribution, excellent performance

Inactive Publication Date: 2006-11-29
成都平和同心金属粉末有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This patent mixes pure copper-clad iron powder with low-melting-point metal, and presses and sinters to produce oil-impregnated bearings. The disadvantage is that when the low-melting-point metal powder and copper-clad iron powder are mixed, due to the large difference in density between them, segregation is prone to occur during mixing, affecting The mechanical properties of oil-impregnated bearing products, and the low-melting-point metals appear liquid phase when the oil-impregnated bearing pressed products are sintered, which increases the shrinkage and deformation of the oil-impregnated bearing pressed products, making it difficult to control the dimensional accuracy of high-precision micro-bearings
[0006] The disadvantage of this patent is that this method can only produce composite powder of pure copper coated iron powder
Add iron powder to copper sulfate solution to obtain pure copper-coated iron powder through replacement reaction. In this method, iron powder is added to copper sulfate solution. During the replacement reaction, the copper sulfate solution quickly dissolves and consumes the fine particles in the iron powder. Iron powder, the particle size distribution of the coated composite powder is not good, which affects the formability of pressed micro-bearing products, and the copper layer deposited on the surface of the iron powder by displacement reaction is sparse, easy to oxidize, and the size of the formed product has a large sintering shrinkage rate, etc. Disadvantages, and cannot produce copper alloy coating powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add 800 grams of iron powder to 5000ml of water.

[0028] (2) Stir and add the solution made of 500 g of copper sulfate and add 0.6 g of rhodin, stop stirring after the reaction is completed.

[0029] (3) After 5-30 minutes of precipitation, remove the supernatant, wash the powder and dry it to obtain pure copper-coated powder.

[0030] (4) Then add 105 grams of zinc oxide powder to the pure copper coating powder and mix well.

[0031] (5) Put the mixed material into a tubular electric furnace, and keep it warm at 350-810°C for 120 minutes under the protection of decomposed ammonia. The dew point of decomposed ammonia is controlled below -40°C. The processed material is cooled to below 100°C under the protection of decomposed ammonia and released from the furnace. The discharged material is crushed and screened to obtain the product.

[0032] The chemical composition of brass alloy coating powder is:

[0033] Copper: 12.14%, Zinc: 8.05%, Iron: 79.23%

Embodiment 2

[0035] Add 15 grams of zinc oxide powder, 14 grams of tin oxide powder, and 0.8 grams of other oxide powders to 800 grams of pure copper-clad iron powder. After mixing, send it to a hydrogen-flowing reduction furnace for alloy coating treatment. The hydrogen dew point is -40°C, the pressure inside the furnace is 20-100PA higher than outside the furnace, the treatment temperature is 350-810°C, and the treatment time is 150 minutes. The treated material is hydrogen-protected and cooled to below 100°C and released from the furnace, and the discharged material is crushed and screened to obtain the product.

[0036] The chemical composition of the bronze alloy coating powder is:

[0037] Copper: 18.03%, Zinc: 1.30%, Tin: 1.35%, Iron: 78.23%, Others: 0.65%.

Embodiment 3

[0039] Get 800 grams of -100 mesh iron powder and add 213 grams of copper oxide powder, 15 grams of zinc oxide powder, and 14 grams of tin oxide powder. Mix evenly and put it in a boat into a reduction furnace through which the ammonia gas is decomposed, and directly carry out the alloy cladding treatment at one time. The dew point of decomposed ammonia is -40°C, the pressure inside the furnace is 20-100PA higher than outside the furnace, the treatment temperature is 350-810°C, and the treatment time is 180 minutes. The treated material is hydrogen-protected and cooled to below 100°C and released from the furnace, and the discharged material is crushed and screened to obtain the product.

[0040] The chemical composition of the bronze alloy coating powder is:

[0041] Copper: 18.24%, Zinc: 1.29%, Tin: 1.32%, Iron: 78.23%.

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Abstract

A Cu-alloy covering powder for covering a Cu-alloy layer on the surface of the Fe particle to become a composite particle less than 80 meshes is disclosed. The brass alloy powder contains proportionally Cu, Zn and Fe. The bronze alloy powder contains proportionally Cu, Zn, Sn, Fe, etc.

Description

Technical field: [0001] The invention belongs to the technical field of composite metal powder preparation, and in particular relates to a copper alloy coating powder and a preparation method thereof. Background technique [0002] Metal powder is the main raw material for manufacturing powder metallurgy mechanical parts and oil-impregnated bearings. It has been developed from single value pure metal powder to alloy powder and coated powder. At present, the manufacture of oil-impregnated bearings at home and abroad generally uses bronze powder as raw material for manufacturing. Due to the need to reduce production costs and improve the performance requirements of oil-impregnated bearings, some oil-impregnated bearing manufacturers have begun to use pure copper-coated iron powder as the main raw material instead. bronze powder. [0003] The CN1241250A patent of Japan Paulad Corporation discloses a method for preparing composite metal powder for sintered bearings and oil-conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/06
Inventor 杨倩
Owner 成都平和同心金属粉末有限公司
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