Method for preparing high-density iron-base powder metallurgy parts

An iron-based powder metallurgy, high-density technology, applied in the field of powder metallurgy forming, can solve the problems affecting the sintered density of materials and low green compact density, and achieve the effects of improving compaction, sintering density, strength and hardness.

Inactive Publication Date: 2013-04-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The commonly used method is to add organic lubricants such as zinc stearate, limited by the uniformity of the mixture and the limited lubricating performance, organic residues will affect the mechanical properties of the parts, and the compact density is low (density 6.8-7.2 g / cm 3 ), affecting the sintered density of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Weigh 2 kg of iron powder with an average particle size of 100 μm and 1 g of molybdenum disulfide powder with an average particle size of 100 μm, and mix them in a ball mill for 8 hours;

[0033] Step 2: Anneal the mixed powder in a hydrogen furnace, the annealing process is: 700°C, 3h;

[0034] Step 3: Weigh 1 kg of mixed powder after annealing, 9 g of 100 μm copper powder, and 5 g of 100 μm graphite, and mix them in a ball mill for 4 hours;

[0035] Step 4: Press the composite iron-based powder to obtain a density of 7.4g / cm under a pressure of 700MPa 3 of compacts.

[0036] Step 5: Place the compact in H 2 Sintering at 1100°C for 1h under protective atmosphere, the density is 7.36 g / cm 3 of samples.

Embodiment 2

[0038] Step 1: Weigh 4 kg of iron powder with an average particle size of 200 μm and 16 g of molybdenum disulfide powder of 100 μm, and mix them in a ball mill for 20 hours;

[0039] Step 2: Anneal the mixed powder in a hydrogen furnace, the annealing process is: 800°C, 2h;

[0040] Step 3: Weigh 1 kg of mixed powder after annealing, 20 g of copper powder of 200 μm, and 15 g of graphite of 250 μm, and mix them in a ball mill for 6 hours;

[0041] Step 4: Press the composite iron-based powder to obtain a density of 7.46g / cm under a pressure of 900MPa 3 of compacts.

[0042] Step 5: Place the compact in H 2 Sintered at 1100°C for 2 hours under a protective atmosphere to obtain a density of 7.35 g / cm 3 of samples.

Embodiment 3

[0044] Step 1: Weigh 1 kg of iron powder with an average particle size of 100 μm and 0.5 g of molybdenum disulfide powder of 100 μm, and mix them in a ball mill for 12 hours;

[0045] Step 2: Anneal the mixed powder in a hydrogen furnace, the annealing process is: 900°C, 2h;

[0046] Step 3: Weigh 500 g of mixed powder after annealing, 1 g of nickel powder of 300 μm, and 2 g of graphite of 300 μm, and mix them in a ball mill for 4 hours;

[0047] Step 4: Press the composite iron-based powder to obtain a density of 7.46g / cm under a pressure of 1000MPa 3 of compacts.

[0048] Step 5: Put the compact in N 2 Sintered at 1050°C for 2.5 hours under a protective atmosphere to obtain a density of 7.49 g / cm 3 of samples.

[0049]

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Abstract

The invention provides a method for preparing high-density iron-base powder metallurgy parts, and belongs to the technical field of powder metallurgy molding. The compaction density of iron-base powder can be increased by utilizing the special stratified structure, the low friction factor and the good lubricating property of MoS2 (molybdenum disulfide). The method comprises the following steps: uniformly mixing the iron powder with MoS2 powder, carrying out annealing treatment, and causing MoS2 to be uniformly distributed on the surface of the iron powder; and uniformly mixing annealed mixed powder with a certain amount of metal powder, graphite powder and the like, and pressing and sintering to obtain the high-density iron-base parts. In the pressing process, the friction force among powder particles is reduced and the friction state among the powder particles is improved through the MoS2, the pressing performance is increased, and the iron-base powder metallurgy parts with the density of 7.2g/cm3-7.5g/cm3 can be obtained. The method has the advantages that the pressing performance of the iron-base powder is improved; the high-density iron-base powder metallurgy parts is obtained on the premise of cost reducing; the friction factor is reduced, the loss of abrasive tools is decreased, and meanwhile, the adverse influence of sulphur on the iron-base parts does not exist; and the process is simple and suitable for industrial production.

Description

[0001] technical field [0002] The invention belongs to the technical field of powder metallurgy forming, and provides a preparation method of high-density iron-based powder metallurgy parts. Provides a traditional powder metallurgy process, using the low friction factor and good lubricity of molybdenum disulfide to improve the compactability of iron-based powder and obtain high density (7.2-7.5g / cm 3 ) iron-based powder metallurgy parts, which greatly reduces production costs and is suitable for industrial production. [0003] Background technique [0004] Iron-based powder metallurgy parts are engineering materials with rapid development and great application potential. Because of their characteristics of material saving, energy saving, low price, uniform product quality and final precision parts, they are widely used in machinery, aviation, aerospace, especially in the automobile industry. There are a wide range of applications, the common ones are pulleys, sprockets, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F1/00
Inventor 郭志猛杨芳王瑞欣罗骥叶青
Owner UNIV OF SCI & TECH BEIJING
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