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Method for preparing cobalt-based coating on surface of cobalt-based alloy

A cobalt-based alloy and cobalt-based technology, applied in metal material coating technology, coating, metal processing equipment and other directions, can solve the problems of high coating porosity, easy peeling of coating and substrate, large coating surface defects, etc. , to achieve the effect of simple proportioning, low cost and easy operation

Active Publication Date: 2019-02-12
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cobalt-based surface modification methods include ion plating, electroplating, etc., but the obtained coating has large surface defects, while the coating prepared by thermal spraying process has high porosity, and the coating and substrate are easy to fall off after long-term use.

Method used

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  • Method for preparing cobalt-based coating on surface of cobalt-based alloy
  • Method for preparing cobalt-based coating on surface of cobalt-based alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) select wet ball mill to add raw material powder, Cr powder: 25wt%, Mo powder: 15wt%,, Al powder: 3.5wt%, cobalt powder: 56.5wt%, dehydrated alcohol is used as grinding medium, carries out with zirconia grinding ball Wet grinding, wherein the ratio of large balls, medium balls, and small balls is 1:2:2, and the weight ratio of balls to medium is 4:2:1. Wet grinding is carried out for 12 hours. The mixed slurry is dried and sieved before adding paraffin wax for molding The agent is then dried and sieved to select a powder mixture with a particle size of 10 μm. Among them, the preparation of cobalt-based electrodes also needs to dope 0.4wt% Y in the powder mixture, accounting for the total mass of raw powder. 2 o 3 powder.

[0028] (2) the powder mixture obtained in step (1) and doped Y 2 o 3 The powder materials are respectively filled in graphite grinding tools, and placed in a vacuum hot-press sintering furnace for vacuum hot-press sintering. The vacuum degree ...

Embodiment 2

[0034] (1) select wet ball mill to add raw material powder, Cr powder: 28wt%, Mo powder: 18wt%,, Al powder: 4wt%,, cobalt powder: 50wt%, carry out wet with dehydrated alcohol as grinding medium, zirconia grinding ball The proportion of large balls, medium balls, and small balls is 1:2:2, and the weight ratio of the ball to medium is 4:2:1. After wet grinding for 24 hours, the mixed slurry is dried and sieved, and then paraffin wax molding agent is added. Dry and sieve to select a powder mixture with a particle size of 10 μm. Among them, the preparation of cobalt-based electrodes also needs to dope 0.5 wt% Y to the powder mixture 2 o 3 powder.

[0035] (2) the powder mixture obtained in step (1) and doped Y 2 o 3 The powder materials are respectively filled in graphite grinding tools, and placed in a vacuum hot-press sintering furnace for vacuum hot-press sintering. The vacuum degree in the furnace is 1.5×10 -1 Pa, the pressure is 20Mpa, during sintering, the temperature ...

Embodiment 3

[0041] (1) Select wet ball mill to add raw material powder, Cr powder: 30wt%, Mo powder: 20wt%, Al powder: 5.5wt%, cobalt powder: 44.5wt%, with absolute ethanol as grinding medium, zirconia grinding ball for wet The proportion of large balls, medium balls, and small balls is 1:2:2, and the weight ratio of ball to medium is 4:2:1. Wet mill for 36 hours, dry and sieve the mixed slurry, add paraffin molding agent and then Dry and sieve to select a powder mixture with a particle size of 10 μm. Among them, the preparation of cobalt-based electrodes also needs to dope 0.6 wt% Y to the powder mixture 2 o 3 powder.

[0042] (2) the powder mixture obtained in step (1) and doped Y 2 o 3 The powder materials are respectively filled in graphite grinding tools, and placed in a vacuum hot-press sintering furnace for vacuum hot-press sintering. The vacuum degree in the furnace is 1.5×10 -1 Pa, the pressure is 20Mpa, during sintering, the temperature is raised to 200°C at a rate of 20°C...

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Abstract

The invention belongs to the technical field of alloy material surface modification treatment, in particular to a method for preparing a cobalt-based coating on the surface of a cobalt-based alloy. The method specifically comprises the following steps that firstly, wet grinding is carried out on cobalt powder, chromium powder, molybdenum powder and aluminum powder according to a ratio to obtain amixture powder, after dried, the mixed powder with appropriate granularity is selected to undergo vacuum hot-pressing sintering to prepare a cobalt-based alloy matrix, Y2O3 is mixed into the raw material powder for wet grinding, then vacuum hot-pressing sintering is carried out to prepare an electrode material, and finally a high-energy micro-arc alloying method is adopted to make the electrode material be deposited on the surface of the cobalt-based alloy matrix under the protection of argon so as to prepare the cobalt-based / Y2O3 coating. According to the method, the coating is in metallurgical bonding with the matrix, so that the compactness of the coating mixed with the Y2O3 is improved, and the surface of the coating is free of obvious defects. The method is good in process repeatability and feasible in process, and the obtained high-corrosion-resistance wear-resistant coating further widens the application range of the cobalt-based alloy.

Description

technical field [0001] The invention belongs to the technical field of alloy material surface modification treatment, and in particular relates to a method for preparing a cobalt-based coating on the surface of a cobalt-based alloy. Background technique [0002] Cobalt-based alloys have good high temperature performance, excellent thermal strength, corrosion resistance and thermal fatigue resistance, making them widely used in fields with relatively harsh conditions and high requirements for wear resistance and corrosion resistance, such as aviation industry, nuclear Industrial and medical biomaterials and other fields. At present, the methods for preparing cobalt-based alloys in China are mainly casting method and powder metallurgy method. The cobalt-based alloy obtained by casting has high dimensional accuracy, smooth surface and no mechanical processing, but defects such as shrinkage porosity and oxidation will appear during the process implementation, which seriously aff...

Claims

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Application Information

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IPC IPC(8): C22C19/07C22C32/00C22C30/00C22C1/04C23C14/06C23C14/32B22F3/14B22F3/24
CPCC22C1/0433C22C19/07C22C30/00C22C32/0026C23C14/0688C23C14/325B22F3/14B22F3/24B22F2998/10B22F2003/242B22F1/10B22F2009/043
Inventor 潘太军江健郭莉莉
Owner CHANGZHOU UNIV
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