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Ferrotitanium-based oily antifriction material

A friction-reducing material and ferro-titanium technology, which is applied in the field of iron-based powder metallurgy materials and their preparation processes, can solve the problems of adhesion and wear on the surface of friction pairs, occlusion, etc., so as to improve the anti-adhesion, improve the anti-friction performance, and increase the anti-friction effect. Effect

Active Publication Date: 2015-07-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with copper-based materials, the anti-friction and wear resistance of iron-based sintered materials still have a large gap, especially under poor oil or no oil lubrication and high working temperature, the surface of the friction pair is prone to adhesive wear or even seizure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The raw materials and quality (mass percentage) of the titanium-iron-based oil-containing anti-friction material are as follows:

[0024] 0.45g (1.5%) titanium hydride powder, 28.05g (93.5%) reduced iron powder, 0.9g (3%) copper powder, 0.21g (0.7%) graphite powder, 0.09g (0.3%) phosphorus iron powder, 0.3g (1%) Zinc stearate.

[0025] The specific preparation steps are as follows:

[0026] (1) Mixing: Put the raw materials of the above formula into a cone mixer, and mix for 0.5h at a speed of 40 r / min to obtain a mixture;

[0027] (2) Pressing: The mixture is fed into the product mold of the press and pressed into a green body under a pressure of 650MPa;

[0028] (3) Sintering: Put the green body into a powder metallurgy sintering furnace, and pass an ammonia decomposition atmosphere for protection at a temperature of 1120°C and a sintering time of 3 hours to obtain a sintered material;

[0029] (4) Oil immersion: The sintered material is vacuum immersed, the oil temperature is ...

Embodiment 2

[0031] The raw materials and mass (mass percentage) of the titanium-iron-based oil-containing anti-friction material are:

[0032] 0.75g (2.5%) titanium hydride powder, 27.33g (91.1%) reduced iron powder, 1.2g (4%) copper powder, 0.24g (0.8%) graphite powder, 0.12g (0.4%) phosphorus iron powder, 0.36g (1.2%) Zinc stearate.

[0033] The preparation method is the same as that in Example 1. The density of the obtained titanium-iron-based oil-containing antifriction material is 6.391g / cm 3 , The oil content is 17.83%, the hardness is 53HRB, the friction coefficient is 0.092, and the wear scar depth is 0.017mm. Compared with Example 1, the density of the formulation material of this example is lower, and the self-lubricating and anti-friction and wear resistance properties are better.

Embodiment 3

[0035] The raw materials and mass (mass percentage) of the titanium-iron-based oil-containing anti-friction material are:

[0036] 1.05g (3.5%) titanium hydride powder, 27.51g (91.7%) reduced iron powder, 0.9g (3%) copper powder, 0.18g (0.6%) graphite powder, 0.06g (0.2%) phosphorus iron powder, 0.3g (1%) Zinc stearate.

[0037] The preparation method is the same as that of Example 1. The density of the obtained titanium-iron-based oil-containing antifriction material is 6.379g / cm 3 , The oil content is 18.779%, the hardness is 54.6HRB, the friction coefficient is 0.084, and the wear scar depth is 0.011mm. Compared with Examples 1 and 2, the formulation materials of this example have the best self-lubricating and anti-wear properties.

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Abstract

The invention discloses a ferrotitanium-based oily antifriction material. The ferrotitanium-based oily antifriction material comprises, by weight, 1.5%-5% of titanium hydride powder, 84.5%-97.1% of reduced iron powder, 1%-5% of copper powder, 0.2%-2.0% of graphite powder, 0.1%-1.5% of ferrophosphorus powder and 0.1%-2% of zinc stearate, and is made through the steps of powder mixing, pressing, sintering, oil-impregnated treatment and the like. Compared with the prior art, by adding the titanium hydride powder into the material, on one hand, the open porosity of the material is improved, more lubricating oil can be stored inside the material, a dynamic pressure oil film formed on the surface of a friction pair can be separated out favorably, and the function of supplementing lubrication is achieved; on the other hand, elementary substance titanium produced by decomposing titanium hydride is reacted with graphite to generate titanium carbide hard particles, so the wear-resisting property of the material is improved. The tribological property of the ferrum-based powder metallurgy material is obviously improved due to the addition of the titanium hydride, and the ferrotitanium-based oily antifriction material has the advantages of being low in cost and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of metal material powder metallurgy, and in particular relates to an iron-based powder metallurgy material with good friction-reducing and wear-resistant effects and self-lubricating properties and a preparation process thereof. Background technique [0002] Iron-based oil-containing powder metallurgy materials have high strength and hardness, high temperature resistance, good wear resistance and low price, and have been widely used in the fields of sliding bearings, automotive friction parts and hydraulic components. However, compared with copper-based materials, the anti-friction and wear resistance of iron-based sintered materials still have a large gap, especially under poor oil or no oil lubrication and high working temperature, the surface of the friction pair is prone to adhesive wear or even seizure. . Therefore, how to improve the anti-friction and wear resistance of iron-based oil-containing mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/16B22F3/26
Inventor 尹延国张国涛尹利广刘振明焦明华解挺俞建卫田明
Owner HEFEI UNIV OF TECH
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