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Method for achieving in-situ synthesis of aluminum oxide enhanced ferrum-based powder metallurgy alloy

An iron-based powder metallurgy and in-situ synthesis technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of poor wettability, poor bonding, insoluble in metal matrix, etc., achieve high interface bonding strength and improve production efficiency , Improve the effect of mechanical properties

Inactive Publication Date: 2020-05-08
常熟市华德粉末冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Al 2 o 3 It has high hardness, high wear resistance and good corrosion resistance, and is difficult to dissolve in the metal matrix at high temperature. It is an excellent reinforcing phase, and the dispersed distribution of Al 2 o 3 Particles are beneficial to improve the mechanical properties and creep resistance of iron-based powder metallurgy, and have good development prospects, but due to the enhancement of the traditionally used external reinforcement, it will lead to Al 2 o 3 Poor wettability and poor bonding with the iron matrix, thus limiting the development of this material

Method used

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  • Method for achieving in-situ synthesis of aluminum oxide enhanced ferrum-based powder metallurgy alloy
  • Method for achieving in-situ synthesis of aluminum oxide enhanced ferrum-based powder metallurgy alloy
  • Method for achieving in-situ synthesis of aluminum oxide enhanced ferrum-based powder metallurgy alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First take 60g of iron powder (purity of 99.5%, particle size of 300 mesh), put it in a muffle furnace, oxidize it at a temperature of 100 ° C for 1 hour, and then add 1% of the total mass of zinc stearate and zinc stearate to the iron powder. The total mass of 1% aluminum powder (purity of 99.5%, particle size of 400 mesh) was ball-milled in a QM-3SP2 planetary ball mill, with a ball-to-material ratio of 10:1, mixed at a speed of 300r / min for 2 hours, and then used The metal powder (about 6g) was pressed into a cylinder with a diameter of 20mm under a pressure of 450Mpa, and the pressure holding time was 6min. Finally, the pressed pattern was placed in a vacuum sintering furnace for sintering. The sintering temperature was 1100°C and the holding time was 1h.

Embodiment 2

[0026] The difference between this example and Example 1 is that the oxidation time is 0.5h, and the content of the added aluminum powder is 5% of the total mass.

Embodiment 3

[0028] The difference between this example and Example 1 is that the content of the added aluminum powder is 10% of the total mass, and the rotational speed of the ball mill is 400 r / min.

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Abstract

The invention discloses a method for achieving in-situ synthesis of an aluminum oxide enhanced ferrum-based powder metallurgy alloy. The method comprises the following steps that (1) ferrous powder isfirstly subjected to oxidation treatment, the oxidation temperature of oxidation treatment ranges from 100 DEG C to 300 DEG C, and the oxidation time ranges from 0.5 h to 1 h; (2) aluminum powder andzinc stearate are added into the ferrous powder subjected to oxidation treatment to be subjected to ball grinding, the adding content of the aluminum powder is 1%-10% of the total mass, and the content of the added zinc stearate is 1%-2% of the total mass; and (3) alloy powder is pressed and sintered, the sintering temperature ranges from 1,000 DEG C to 1,150 DEG C, the temperature increase speedis 10-20 DEG C / min, and heat insulation is carried out after sintering. In the method, particles of the second phase are generated in situ, the complex enhancer pretreatment procedure in a traditional manner of externally mounting an enhancer is avoided, and production efficiency can be greatly improved; and for a composite prepared through the method, the enhancer is nucleated and grows in a metal matrix, and therefore the surface of the enhancer is free of pollution, the intermiscibility of the matrix and the enhancer is good, the interface bonding strength is high, and the mechanical performance of products can be effectively improved.

Description

technical field [0001] The invention relates to a method for in-situ synthesis of alumina reinforced iron-based powder metallurgy alloy, which is used for preparing the iron-based powder metallurgy alloy. Background technique [0002] Second-phase particle reinforcement is a very common means of strengthening metals. The metal matrix composites reinforced by this method can have the advantages of both the matrix metal and the reinforcing phase, and exhibit properties such as high strength, low cost, high modulus, easy fabrication and high wear resistance, and have broad application prospects. The powder metallurgy method, because of its special process of preparing alloys by powder pressing and sintering, is conducive to the introduction of the second phase particles, so the metal prepared by the powder metallurgy method is especially suitable for the second phase strengthening, and the powder metallurgy method can maximize the Minimize the segregation of alloy components, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02C22C38/00B22F1/00
CPCC22C33/0235C22C33/0228C22C32/0026C22C38/00B22F2998/10B22F1/145B22F3/23B22F3/02B22F2009/043
Inventor 张莎莎杨海屹刘子利陆贤文邹德华陶学伟姚正军
Owner 常熟市华德粉末冶金有限公司
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