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Slurry chromium impregnation permeating agent slurry and chromium impregnation layer preparing method

A technology of slurry and infiltration agent, applied in the field of metal infiltration, can solve the problems of easy loss of protective effect and easy shedding of chrome-plated protective chrome-plated layer, achieving low friction factor, and solving the effect of easy falling off and not easy to fall off.

Inactive Publication Date: 2017-01-04
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prepared chrome-plated protective chrome layer is easy to fall off, and it is easy to lose the protective effect.

Method used

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  • Slurry chromium impregnation permeating agent slurry and chromium impregnation layer preparing method
  • Slurry chromium impregnation permeating agent slurry and chromium impregnation layer preparing method

Examples

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Effect test

preparation example Construction

[0035] The preparation process of the metal powder infiltration agent is as follows: in terms of weight percentage, the metal powder with a weight percentage of 30% to 40% of aluminum oxide powder, 2% to 3% of ammonium chloride, and the rest is pure chromium powder. , and dry at 100°C to 150°C to obtain metal powder penetration agent;

[0036] The preparation process of the binder is as follows: first mix acetone and acetylacetone, then add cellulose acetate, and stir the mixed solution to melt the cellulose acetate to obtain the binder, wherein, by weight percentage, the binder is Contains 75-70% acetone, 2-4% cellulose acetate, and the rest is acetylacetone;

[0037] Then mix the metal powder penetration agent and the binder according to the weight ratio of 1:1, put the mixture of the metal powder penetration agent and the binder into the ceramic tank and seal the ceramic tank, and the ceramic tank will pass the ceramic ball to the metal powder. The penetrating agent and th...

Embodiment 1

[0049] The chromizing layer preparation method of the slurry chromizing of the present embodiment is carried out according to the following steps, and the processed parts are positioning pins with an outer diameter of ф38mm, an inner diameter of ф32mm, and a circular arc surface with a height of H=24mm:

[0050] First prepare metal powder infiltration agent and binder respectively:

[0051] The preparation process of the metal powder penetrating agent is, in terms of weight percentage, mix evenly the metal powder which is 30% by weight of aluminum oxide powder, 2% of ammonium chloride, and the rest is pure chromium powder, and baked at 110°C Dry to obtain the metal powder penetrating agent;

[0052] The preparation process of the binder is as follows: first mix acetone and acetylacetone, then add cellulose acetate, and stir the mixed solution to melt the cellulose acetate to obtain the binder, wherein, by weight percentage, the binder is Contains 70% acetone, 3% cellulose ace...

Embodiment 2

[0064] The chromizing layer preparation method of the slurry chromizing of the present embodiment is carried out according to the following steps, and the processed parts are positioning pins with an outer diameter of ф38mm, an inner diameter of ф32mm, and a circular arc surface with a height of H=24mm:

[0065] First prepare metal powder infiltration agent and binder respectively:

[0066] The preparation process of the metal powder infiltrant is as follows, in terms of weight percentage, the weight percentage is 35% of aluminum oxide powder, 3% of ammonium chloride, and the rest is pure chromium powder. Dry to obtain the metal powder penetrating agent;

[0067] The preparation process of the binder is as follows: first mix acetone and acetylacetone, then add cellulose acetate, and stir the mixed solution to melt the cellulose acetate to obtain the binder, wherein, by weight percentage, the binder is Contains 74% acetone, 2% cellulose acetate, and the rest is acetylacetone; ...

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Abstract

The invention belongs to the technical field of metal impregnation, and particularly relates to a slurry chromium impregnation permeating agent slurry and chromium impregnation layer preparing method. The method is used for preparing a permeating layer capable of improving surface corrosion resistance, wear resistance and high-temperature resistance performance of a metal material product. The method comprises the steps that a protecting sleeve is used for the non-permeating-layer portion of a cleaned part for protecting, and therefore the portion cannot be coated with permeating agent slurry; the portion, required to be subject to chromium impregnation, of the part is evenly coated with the permeating agent slurry, and the thickness of a coating layer ranges form 1.5 mm to 2.0 mm; after the coating layer is dried, the part is subject to chromium impregnation in a vacuum tank under the protection atmosphere protection, in the chromium impregnation process, the heat preservation temperature ranges from 1040 DEG C to 1090 DEG C, the heat preservation time ranges from 5 h to 10 h, furnace cooling to the temperature below 300 DEG C is carried out, and during furnace cooling, the pressure is 0.5 to 1.0 time of the standard atmospheric pressure. Metallurgical bonding is achieved, it is ensured that the coating can be tightly combined with a base body and is not prone to falling off, the depth of the prepared chromium impregnation layer ranges from 0.005 mm to 0.020 mm, and the chromium impregnation surface shows the silver gray.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of metallization, and in particular relates to a slurry chromizing agent slurry and a preparation method for a chromizing layer, which are used to improve the corrosion resistance, wear resistance, and high temperature resistance of the metal material workpiece surface. preparation. [0003] 【Background technique】 [0004] Spherical parts such as engine positioning pins are made of 4Cr14Ni14W2Mo, which are prone to wear and tear during work and cause parts to fail. Partial chromizing protection is carried out on the friction surface of the parts to increase the surface hardness, thereby improving the abrasive wear resistance of the material, and prolonging the service life and reliability. The hardness of the chromized layer is detected by the electronic microhardness tester on the chromized surface. The hardness value of the chromized layer after chromizing the parts is much higher than the hardnes...

Claims

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Application Information

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IPC IPC(8): C23C10/32
CPCC23C10/32
Inventor 孙惠娴曾凌霄王文军张磊李补效李茂安李卫卫高贵忠
Owner AECC AVIATION POWER CO LTD
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