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Paint for casting Mg alloy with metal mould and its preparing process

A technology of metal mold casting and magnesium alloy, which is applied in the field of magnesium alloy metal mold casting coating, magnesium alloy metal mold casting coating and preparation, can solve the problems of hot cracking of magnesium castings, and achieve the characteristics of not easy to precipitate, smooth surface and excellent suspension Effect

Inactive Publication Date: 2004-09-01
SHANGHAI HAOHUA MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the coatings used in the production of magnesium alloys are based on aluminum alloy coatings, and there are very few special coatings for magnesium alloys, and magnesium castings often produce hot cracks during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Magnesium alloy metal mold casting coating composition (mass percentage): 6% of talcum powder, 2% of diatomite, 3% of water glass, 0.3% of attapulgite clay, 0.2% of sodium alkylsulfonate, 3% of boric acid, and 85.5% of water .

[0012] Mix the attapulgite clay with 10 parts of water and grind it in a colloid mill or ball mill for 2 hours to make nail polish. Then put talcum powder, diatomaceous earth, sodium alkylsulfonate and boric acid into a colloid mill or a ball mill, respectively add liquid A, water glass and water and grind for 2 hours to get the magnesium alloy metal mold casting coating.

[0013] When in use, the metal mold is heated to about 250°C, and a layer of magnesium alloy casting paint with a thickness of 0.1 mm is applied to the surface of the metal mold by spraying, and it can be used after drying. The coating prevents the burning of the magnesium alloy in the casting mold during pouring, and obtains the magnesium alloy casting without hot crack, smo...

Embodiment 2

[0015] Magnesium alloy metal mold casting coating composition (mass percentage): talcum powder 3%, diatomite 4%, silica sol 4%, palygorskite clay 0.8%, NH4 B f 4 0.6%, boric acid 3%, and water 84.6%.

[0016] Mix palygorskite clay with 20 parts of water and grind it in a colloid mill or ball mill for 3 hours to make nail polish. Then talcum powder, diatomaceous earth, NH 4 BF 4 and boric acid into a colloid mill or a ball mill, respectively add liquid A, silica sol and water to grind for 2 hours, and then the magnesium alloy metal mold casting coating can be obtained.

[0017] When in use, the metal mold is heated to about 200°C, and a layer of magnesium alloy casting paint with a thickness of 0.2 mm is applied to the surface of the metal mold by spraying, and it can be used after drying. The coating prevents the burning of the magnesium alloy in the casting mold during pouring, and obtains the magnesium alloy casting without hot crack, smooth surface and no oxidation wri...

Embodiment 3

[0019] Magnesium alloy metal mold casting coating composition (mass percentage): 5% talcum powder, 3% diatomaceous earth, 3% silica sol, 1% aluminum phosphate, 0.7% palygorskite clay, KBF 4 0.5%, sodium alkylsulfonate 2%, and water 84.8%.

[0020] Mix palygorskite clay with 20 parts of water and grind it in a colloid mill or ball mill for 3 hours to make nail polish. Then talcum powder, diatomaceous earth, KBF 4 Put sodium alkyl sulfonate into colloid mill or ball mill, add solution A, silica sol, aluminum phosphate and water and grind for 3 hours to get magnesium alloy metal mold casting coating.

[0021] When in use, the metal mold is heated to about 200°C, and a layer of magnesium alloy casting paint with a thickness of 0.15 mm is applied to the surface of the metal mold by spraying, and it can be used after drying. The coating prevents the burning of the magnesium alloy in the casting mold during pouring, and obtains the magnesium alloy casting without hot crack, smooth ...

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PUM

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Abstract

A casting paint for casting Mg alloy with metal mould is prepared from talc powder (3-8 mass%), diatomite (2-5), adhesive (1.5-4), suspending agent (0.3-2), flame retarding agnet (2-7) and water (75-90). Said adhesive may be water glass, silica sol, or aluminium phosphate. Said suspending agent may be attapulgite clay or palygorskite clay. Said flame-retarding agent may be NH4BF4, KBF4, etc. Its advantages are high performance, not easy deposition and smooth surface of casting.

Description

technical field [0001] The invention relates to a magnesium alloy metal mold casting coating, especially a magnesium alloy metal mold casting coating with strong thermal insulation, flame retardancy, cohesiveness and coating properties and its preparation method, belonging to metal materials and metallurgical field. Background technique [0002] Due to the active chemical properties of magnesium, liquid magnesium easily reacts with oxygen, nitrogen in the atmosphere and water in the mold. The surface films such as magnesium oxide and magnesium nitride produced as a result of the reaction have low density coefficients and poor thermal conductivity. The large amount of heat released by the reaction cannot be dissipated quickly, resulting in a rapid rise in temperature on the reaction interface, which in turn accelerates the magnesium The oxidation of magnesium intensifies the combustion of magnesium. As a result, holes or oxide wrinkles appear on the surface of the casting, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22D21/04
Inventor 吴国华卢晨曾小勤丁文江
Owner SHANGHAI HAOHUA MOLD