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Method for synthesizing metal/ceramic composite coating by spraying and self-reaction composite powder on metal surface

A ceramic composite, metal surface technology, applied in metal material coating process, coating, fusion spraying and other directions, can solve the problem of not being able to prepare coating on the outer wall of the workpiece, improve thermal shock resistance, enhance bonding strength, overcome brittle effect

Inactive Publication Date: 2004-08-18
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And it is mainly used for the preparation of the inner wall coating of the pipe fittings, and cannot prepare the coating on the outer wall of the workpiece

Method used

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  • Method for synthesizing metal/ceramic composite coating by spraying and self-reaction composite powder on metal surface
  • Method for synthesizing metal/ceramic composite coating by spraying and self-reaction composite powder on metal surface
  • Method for synthesizing metal/ceramic composite coating by spraying and self-reaction composite powder on metal surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Example 1 Spray self-reactive composite powder on Q235 steel to synthesize a 1.2mm thick metal / ceramic composite coating

[0070] 1. Prepare 700g of self-reactive composite powder

[0071] (1) 1280g iron oxide (Fe 2 o 3 ) powder and 540g aluminum (Al) powder are put into ball mill, add appropriate amount of ethanol simultaneously, mix 20 hours, until stirring evenly;

[0072] (2) The mixed powder that stirs is dried;

[0073] (3) Add 250ml of adhesive polyvinyl alcohol (PVA) to the uniform mixed powder, and stir for 2.5 hours at the same time, until the mixed powder becomes a composite powder with large particles;

[0074] (4) Put the prepared large-particle composite powder into a drying box, and keep the temperature at 100°C for 20 hours until the particles are completely dry;

[0075] (5) Put the dried large-particle composite powder into a pulverizer to pulverize, and then use a sieve to screen the composite powder between -60 and +80 mesh for later use.

[007...

Embodiment 2

[0108] Example 2: Spraying self-reactive composite powder on low carbon steel to synthesize a 1.0-1.2mm thick metal / ceramic composite coating

[0109] 1. Prepare 600g of self-reactive composite powder

[0110] (1) 1120g iron oxide (Fe 2 o 3 ) powder and 470g aluminum (Al) powder are put into ball mill, add appropriate amount of ethanol simultaneously, mix 18 hours, until stirring evenly;

[0111] (2) the mixed powder that mixes evenly is dried;

[0112] (3) Add 220ml of adhesive polyvinyl alcohol (PVA) to the uniform mixed powder, and stir for 2 hours at the same time until the mixed powder becomes a composite powder with large particles;

[0113] (4) Put the prepared large-particle composite powder into a drying box, and keep the temperature at 150° C. for 1 hour until the particles are completely dry;

[0114] (5) Put the dried large-particle composite powder into a pulverizer to pulverize, and then use a sieve to screen the composite powder between -120 and +150 mesh fo...

Embodiment 3

[0147] Example 3 Spraying self-reactive composite powder on low-carbon steel to synthesize a 1.0-1.2mm thick metal / ceramic composite coating

[0148] 1. Prepare 800g of self-reactive composite powder

[0149] (1) 1440g iron oxide (Fe 2 o 3 ) powder and 600g aluminum (Al) powder were put into the ball mill, and an appropriate amount of ethanol was added at the same time, and mixed for 24 hours until uniformly stirred;

[0150] (2) the mixed powder that mixes evenly is dried;

[0151] (3) Add 300ml of adhesive polyvinyl alcohol (PVA) to the uniform mixed powder, and stir for 3 hours at the same time until the mixed powder becomes a composite powder with large particles;

[0152] (4) Put the prepared large-particle composite powder into a drying box, and keep the temperature at 120° C. for 15 hours until the particles are completely dry;

[0153] (5) Put the dried large-particle composite powder into a pulverizer to pulverize, and then use a sieve to screen the composite powder...

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Abstract

The present invention relates to the field of ceramic coating preparing technology and aims at solving the problems of preparing refractory ceramic coating, improving performance of ceramic coating and lowering cost of ceramic coating. The main technological point is plasma spraying self-reacton composite powder onto metal surface to form composite metal / ceramic coating. The composite powder is compounded with metal oxide powder with aluminothmics reaction, aluminum powder and adhesive. The present invention is used mainly for the metal surface with both high temperature and wear.

Description

technical field [0001] The invention belongs to a metal / ceramic coating and a spraying method thereof, in particular to a method for synthesizing a metal / ceramic composite coating by spraying self-reactive composite powder on a metal surface. Background technique [0002] Canada's B.champagne et al. used FeTi alloy powder, Ti powder, and B powder as raw materials for self-propagating sintering, pulverized the sintered product, and then sprayed the sintered product to prepare TiB 2 -Fe coating. Spraying process is not combined with self-reaction, TiB 2 Not easy to melt. G.cliché and S.dallaire used FeTi alloy powder, Ti powder and graphite powder as raw materials to prepare TiC-Fe coating. The preparation process is: FeTi alloy powder and Ti powder are respectively ground in ethanol, then mixed, washed with water, and dried , add binder, plasticizer, graphite to make comprehensive ingredients, and spray slurry to make small particles for spraying. The preparation process i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/04
Inventor 阎殿然何继宁董艳春李香芝
Owner HEBEI UNIV OF TECH
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