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Phosphorous graphite ferrum-based powder metallurgy antifriction material

An iron-based powder metallurgy and friction-reducing material technology, applied in the field of powder metallurgy materials, can solve the problems affecting the material pressing uniformity and sintering effect, affecting the performance of the material, low density, etc. Anti-friction and self-lubricating properties, improve wear resistance and load-carrying capacity, and improve the effect of anti-friction

Inactive Publication Date: 2014-08-13
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although such a powder mixing method has been widely used in production, there are serious shortcomings, that is, the low-density powder still floats after the oil evaporates, which affects the uniformity of pressing and sintering effect of the material, and ultimately affects the performance of the material.

Method used

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  • Phosphorous graphite ferrum-based powder metallurgy antifriction material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The formula is as follows: the iron-based powder is divided into units of measurement by weight, the copper-plated flake graphite is 4%, ordinary graphite powder is 0.5%, zinc stearate is 1%, phosphorus is 0.1%, and the balance For iron powder.

[0024] Concrete preparation operation steps are as follows:

[0025] (1) mixed

[0026] Take the raw materials according to the formula, stir and mix for 3 minutes at a speed of 3000r / min, add a binder whose mass is 2%~3% of the mixed powder, and stir for 2 minutes to obtain the mixed powder; the mixed powder passes through a 100-mesh sieve to obtain Dough granules are dried for 30 minutes at a temperature of 100°C, passed through a 100-mesh sieve for the second time, and dried for 1 hour at a temperature of 100°C to obtain dry powder particles; the binder is epoxy resin, polyethylene Alcohol and ethanol are prepared in a volume ratio of 1:1:10;

[0027] (2) suppression

[0028] Send the powder into the product mold of the ...

Embodiment 2

[0033] The powder metallurgy formula of the present invention is as follows: the iron-based powder is divided into units of measurement by weight, the copper-plated flake graphite is 3%, ordinary graphite powder is 0.4%, zinc stearate is 0.8%, phosphorus 0.2%, and the balance is iron powder. Preparation method and operation steps are identical with embodiment 1; The density of this material is 6.676g / cm 3 , The hardness is 91HRB, the friction coefficient is 0.083, the wear scar depth is 0.006mm, and the friction temperature rise is 86°C. The results show that the density of the formula material in this example is slightly reduced, but it has better anti-friction and wear resistance than Example 1.

Embodiment 3

[0035] The powder metallurgy formula of the present invention is as follows: the iron-based powder is divided into measurement units by weight, the copper-plated flake graphite is 4%, ordinary graphite powder is 1%, zinc stearate is 1.5%, phosphorus 0.3%, and the balance is iron powder. Preparation method and operation steps are identical with embodiment 1; The density of this material is 6.677g / cm 3 , The hardness is 96HRB, the friction coefficient is 0.075, the wear scar depth is 0.0038mm, and the friction temperature rise is 69℃. Compared with Examples 1 and 2, the anti-friction, wear-resistant, and anti-adhesion properties of the powder metallurgy material formulated in this example are significantly better.

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Abstract

The invention discloses a phosphorous graphite ferrum-based powder metallurgy antifriction material comprising the following raw material components:0.1-5% of copper-plated flake graphite, 0.1-3.5% of common graphite powder, 0.1-3% of zinc stearate, 0.1-4% of phosphorus and the balance of ferrum powder. The powder metallurgy material is prepared through the steps of powder mixing, pressing and sintering. Compared with the prior art, an adopted new powder mixing granulation method has the advantages that the problem that powders with different masses and densities are segregated and layered in a powder material mixing process is avoided, and the segregation of graphite in the material is avoided effectively; a copper-plated flake graphite and the common graphite powder mixed adding way is adopted, so that the pressing moldability and sintering characteristic of the material are improved; due to the addition of phosphorus, the hardness and adhesive abrasion resistance of the material are remarkably improved; in a word, the antifriction and wear resistant characteristics of the ferrum-based powder metallurgy antifriction material disclosed by the invention are improved, and the ferrum-based powder metallurgy antifriction material has the advantages of relatively low cost and wide application range.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy materials, and in particular relates to a phosphorus-containing graphite iron-based powder metallurgy material with excellent friction-reducing and wear-resisting effects and self-lubricating properties and a preparation process. Background technique [0002] Iron-based sintered self-lubricating materials have been widely used as substitute materials for copper alloys in the fields of sliding bearings, automotive friction parts and hydraulic components due to their excellent strength and wear resistance, low post-processing material loss and high cost performance. Among them, the iron-based gear pump side plate is a typical example of the application of iron-based sintered self-lubricating materials in the production of hydraulic components. However, the anti-friction performance of iron-based sintered materials is generally not as good as that of copper-based materials, especially in po...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C33/02
Inventor 焦明华陈涛田明苏柏万尹延国俞建卫马少波
Owner HEFEI UNIV OF TECH
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