Coating for copper alloy metal mold casting, and preparation method thereof

A metal mold casting and copper alloy technology, applied in casting molding equipment, metal processing equipment, coating, etc., can solve the problems of pollution, easy falling off, poor demolding performance, etc., and achieve extended service life and high bonding strength , good mold release effect

Inactive Publication Date: 2019-06-11
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention develops an environmentally friendly coating with good lubricating performance, low cost and no pollution, and strives to solve the problems of poor mold release performance, easy falling off

Method used

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  • Coating for copper alloy metal mold casting, and preparation method thereof
  • Coating for copper alloy metal mold casting, and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0018] Example 1

[0019] The composition and weight percentage of copper alloy metal casting coating: talc powder 32%, mica powder 15%, boron nitride powder 8%, sodium bentonite 4%, sodium carboxymethyl cellulose 0.4%, water glass 5%, Sodium hexametaphosphate 1%, water balance.

[0020] The preparation method is as follows:

[0021] 1) Add water to sodium bentonite to make a 20wt% paste solution to fully dissolve the sodium bentonite, and let it stand for 24 hours to make the activation reaction fully proceed;

[0022] 2) Sodium hexametaphosphate and sodium carboxymethyl cellulose are respectively added with water to make 10wt% and 5wt% aqueous solutions, and stand for 24h to fully dissolve them until use;

[0023] 3) Mix the sodium bentonite slurry and the remaining water for 10 minutes, add water glass and stir evenly, then add sodium carboxymethyl cellulose and sodium hexametaphosphate solution and stir until uniform, add talc powder, mica powder, and boron nitride The powder was ...

Example Embodiment

[0028] Example 2

[0029] The composition and weight percentage of copper alloy metal casting coating: talc powder 35%, mica powder 18%, boron nitride powder 5%, sodium bentonite 6%, sodium carboxymethyl cellulose 0.7%, water glass 4%, Sodium hexametaphosphate 1.3%, water balance.

[0030] The preparation method is as follows:

[0031] 1) Add water to sodium bentonite to make a 20wt% paste solution to fully dissolve the sodium bentonite, and let it stand for 24 hours to make the activation reaction fully proceed;

[0032] 2) Sodium hexametaphosphate and sodium carboxymethyl cellulose are respectively added with water to make 10wt% and 5wt% aqueous solutions, and stand for 24h to fully dissolve them until use;

[0033] 3) Mix the sodium bentonite slurry and the remaining water for 10 minutes, add water glass and stir evenly, then add sodium carboxymethyl cellulose and sodium hexametaphosphate solution and stir until uniform, add talc powder, mica powder, and boron nitride The powder wa...

Example Embodiment

[0038] Example 3

[0039] The composition and weight percentage of copper alloy metal casting coating: talc powder 38%, mica powder 10%, boron nitride powder 7%, sodium bentonite 8%, sodium carboxymethyl cellulose 0.4%, water glass 5%, Sodium hexametaphosphate 1.6%, water balance.

[0040] The preparation method is as follows:

[0041] 1) Add water to sodium bentonite to make a 20wt% paste solution to fully dissolve the sodium bentonite, and let it stand for 24 hours to make the activation reaction fully proceed;

[0042] 2) Sodium hexametaphosphate and sodium carboxymethyl cellulose are respectively added with water to make 10wt% and 5wt% aqueous solutions, and stand for 24h to fully dissolve them until use;

[0043] 3) Mix the sodium bentonite slurry and the remaining water for 10 minutes, add water glass and stir evenly, then add sodium carboxymethyl cellulose and sodium hexametaphosphate solution and stir until uniform, add talc powder, mica powder, and boron nitride The powder wa...

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Abstract

The invention relates to a coating for copper alloy metal mold casting, and a preparation method thereof. The coating provided by the invention is prepared by selecting talcum powder, mica powder andboron nitride powder as refractory aggregates, sodium bentonite and sodium carboxymethylcellulose as suspending agents, sodium silicate and sodium hexametaphosphate as binding agents, and the balancewater. The novel coating provided by the invention is good in environmental protection performance, the binding strength of the coating and the surface of a die is high, the surface of the die is protected against being erosively worn by an alloy melt, the service life of the die is prolonged, a casting piece has good demoulding performance, smooth surface, compact inner structure, and no defectssuch as shrinkage porosity, air holes and cold shuts, and the surface quality of the copper alloy casting piece is effectively improved.

Description

technical field [0001] The invention relates to the field of nonferrous metal metallurgy, in particular to a coating for copper alloy metal mold casting and a preparation method thereof. Background technique [0002] Copper and its alloys are widely used in aviation, automobiles and oceans because of their excellent electrical and thermal conductivity, ductility and corrosion resistance, good processing performance and casting performance, anti-friction and wear resistance, and beautiful color. field. Metal mold casting is a casting process widely used in copper alloy casting production. Metal mold casting has the advantages of high process performance, high dimensional accuracy, and good surface quality of castings. However, in the production process of metal mold casting, due to the harsh working conditions, the surface of the mold cavity is subjected to the erosion wear and thermal stress of the high-temperature molten metal, resulting in failure forms such as fatigue cr...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C23/02
Inventor 林有希郑开魁陈颖楼敏闫盛青
Owner FUZHOU UNIVERSITY
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