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Magnesium-alloy metal-type casting coating and preparation method thereof

A metal mold casting and magnesium alloy technology, applied in casting molding equipment, metal processing equipment, coating, etc., can solve the problems of coating adhesion decline, zinc oxide easy to deteriorate and fail, unfavorable casting feeding and other problems, and achieve stability and high durability, which is conducive to continuous production and the effect of extending the service life

Active Publication Date: 2010-03-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Found through literature search to prior art, " magnesium alloy " (Chen Zhenhua. Magnesium alloy [M]. Beijing: Chemical Industry Press, 2004: 105) provides four kinds of coatings commonly used for magnesium alloy metal mold casting, and these coatings are all Water glass is used as a binder, and its disadvantage as a metal mold coating is that at 400-450 ° C, the silicone gel will lose water and crack, which will reduce the adhesion strength between the water glass coating and the mold wall, thereby Lead to a decrease in the adhesion of the paint and affect the service life of the paint
[0008] Chinese patent: 1935410A (a magnesium alloy coating composition and its preparation method), this patent only uses zinc oxide and graphite as refractory aggregates, and its deficiency as a metal type coating is: zinc oxide is easy to deteriorate and fail, graphite and zinc oxide The thermal conductivity of the coating is relatively large, so the thermal insulation performance of the coating is poor, which is not conducive to the feeding of castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Components and percentages by weight of the prepared magnesium alloy metal mold casting coating: 13% of magnesium oxide, 8% of forsterite, 12% of titanium oxide, 9% of asbestos powder, 3.5% of bentonite, 0.2% of sodium carboxymethyl cellulose, 0.2% polyacrylamide, 2.7% sodium hexametaphosphate, 0.9% silica sol, 0.9% aluminum dihydrogen phosphate, 3% boric acid, and the rest is water.

[0027] Get 19.5g of magnesium oxide, 12g of forsterite, 18g of titanium oxide powder and 13.5g of asbestos powder, and make A by ball milling for 15 minutes;

[0028] Mix 4.05g sodium hexametaphosphate, 1.35g silica sol, 1.35g aluminum dihydrogen phosphate and 5.25g bentonite, add 23.3g water to activate, and make B;

[0029] Mix 4.5g of boric acid, 0.3g of sodium carboxymethyl cellulose and 0.3g of polyacrylamide, add 46.6g of water to activate to make C;

[0030] Mix A, B and C, and grind for 30 minutes with a ball mill or a colloid mill to obtain a magnesium alloy metal mold casting c...

Embodiment 2

[0034] Components and percentages by weight of the prepared magnesium alloy metal mold casting coating: 20% magnesium oxide, 15% titanium oxide, 5% asbestos powder, 2% bentonite, 0.2% sodium carboxymethyl cellulose, 0.4% polyacrylamide, Sodium hexametaphosphate 2%, silica sol 1%, boric acid 3%, and the rest is water.

[0035] Take 30g of magnesium oxide, 22.5g of titanium oxide powder and 7.5g of asbestos powder, and make A by ball milling for 10 minutes;

[0036] Mix 3g sodium hexametaphosphate, 1.5g silica sol and 3g bentonite, add 25.7g water to activate, and make B;

[0037] Mix 4.5g boric acid, 0.3g sodium carboxymethylcellulose and 0.6g polyacrylamide, add 51.4g water to activate to make C;

[0038] Mix A, B and C, and grind for 30 minutes with a ball mill or a colloid mill to obtain a magnesium alloy metal mold casting coating.

[0039] When in use, heat the mold to 250°C, apply a 0.2mm-thick coating on the surface of the mold by spraying, and use it after drying.

...

Embodiment 3

[0042] Components and percentages by weight of the prepared magnesium alloy metal mold casting paint: 25% magnesium oxide, 4% forsterite, 22% titanium oxide, 5% talcum powder, 4% bentonite, 0.4% sodium carboxymethyl cellulose, 0.2% polyacrylamide, 2.5% sodium hexametaphosphate, 2% boric acid, and the rest is water.

[0043] Get 37.5g of magnesium oxide, 6g of forsterite, 33g of titanium oxide powder and 7.5g of talcum powder, and make A by ball milling for 15 minutes;

[0044] Mix 3.75g sodium hexametaphosphate and 6g bentonite, add 17.45g water to activate, and make B;

[0045] Mix 3g boric acid, 0.6g sodium carboxymethylcellulose and 0.3g polyacrylamide, add 34.9g water to activate to make C;

[0046] Mix A, B and C, and grind for 30 minutes with a ball mill or a colloid mill to obtain a magnesium alloy metal mold casting coating.

[0047] When in use, heat the mold to 200°C, apply a 0.25mm thick coating on the surface of the mold by spraying, and use it after drying.

[...

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Abstract

The invention relates to a magnesium-alloy metal-type casting coating and a preparation method thereof. Magnesia and forsterite are used as refractory aggregates; titania, asbestos powder or talcum powder or diatomite, and the like are added as heat-insulation aggregates; a mixed caking agent with favorable high-temperature caking property and a compound suspending agent are selected; and boric acid is added as a flame retardant. The preparation method comprises the following steps: mixing the magnesia, the forsterite, the titania, and the asbestos powder or talcum powder or diatomite, and preparing A after ball milling; mixing the caking agent and bentonite, and adding water to activate so as to obtain B; mixing the boric acid, sodium carboxymethyl cellulose and polyacrylamide, and addingwater to activate so as to obtain C; and finally, mixing A, B and C, and carrying out ball milling or colloid milling for more than 30 minutes to obtain the magnesium-alloy metal-type casting coating. The coating has the advantages of favorable heat insulation, caking property, coating property, flame retardance, stability and durability, is beneficial to continuous production and convenient forobtaining magnesium-alloy metal-type castings with favorable surface quality and superior performance, and prolongs the service life of moulds.

Description

technical field [0001] The invention relates to a coating in the technical field of metal materials and a preparation method thereof, in particular to a magnesium alloy metal mold casting coating and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest structural metal in industrial applications. It has high specific strength and specific stiffness, good thermal conductivity and electrical conductivity, excellent damping and shock absorption performance, convenient processing and molding, easy recycling, and meets environmental protection requirements. It has important application value and broad application prospects in the fields of automobiles, electronics, aerospace, national defense, etc., and is known as "the green engineering material of the 21st century". [0003] Metal mold casting has become one of the important forming methods of magnesium alloys due to its advantages of high production efficiency, good casting surface qualit...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 张亮王迎新彭立明丁文江
Owner SHANGHAI JIAO TONG UNIV
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