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Casting powder for casting magnesium aluminum alloy

A technology of mold slag and magnesium alloy, applied in the field of metal casting, can solve the problems of aggravated magnesium combustion, poor thermal conductivity, and oxide wrinkle, and achieve the effect of enhancing the feeding effect, reducing the tendency of thermal cracking, and free of oxide wrinkle.

Inactive Publication Date: 2009-06-03
大连核心铸造技术工程研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface films such as magnesium oxide and magnesium nitride formed as a result of the reaction have low density coefficients and poor thermal conductivity, and the large amount of heat released by the reaction cannot be dissipated quickly, resulting in a rapid rise in temperature on the reaction interface and accelerated oxidation of magnesium, which intensifies burning of magnesium
As a result, holes or oxide wrinkles appear on the surface of the casting, and the casting is scrapped in severe cases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: A magnesium alloy foundry mold flux, its composition weight percent is: artificial mica suspending agent 69%; alkylsulfonate sodium flame retardant 31%.

[0014] A total amount of 6% of a binder can also be added to the above-mentioned mold powder, and the binder can be selected from silica sol or aluminum phosphate.

Embodiment 2

[0015] Embodiment 2: A magnesium alloy casting mold flux, its composition weight percent is: 55% of bentonite suspending agent; 45% of boric acid flame retardant.

[0016] A binder of 5% in total can also be added to the mold flux, and the binder can be silica sol or aluminum phosphate.

Embodiment 3

[0017] Embodiment 3: A magnesium alloy casting mold flux, the mold flux components in weight percent are: diatomite, suspending agent 6%; boric acid flame retardant 40%.

[0018] A total amount of 5-6% of a binder can also be added to the mold flux, and the binder can be silica sol or aluminum phosphate.

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Abstract

The invention relates to a casting powder for casting magnesium aluminum alloy. The casting powder comprises the following components at weight percentage: 55-69% of a deflocculant and 31-45% of a fire retardant. The casting powder can be added with a binder accounting for 5-6% of the casting powder by weight, and the binder can be chosen from silicasol or aluminum phosphate. The deflocculant can be chosen from micanite, bentonite, diatomite, palygorskite clay and the like. The fire retardant can be chosen from alkyl sodium sulfonate, boric acid and the like. The casting powder has better temperature retention, fire retardancy and paintability, excellent floatability, and is uneasy for deposition in use. The casting powder reduces hot crack trend of magnesium aluminum alloy castings. The casting powder forms a layer of reducing protective atmosphere on a riser magnesium aluminum interface in casting, which prevents the magnesium aluminum alloy from oxidation, prevents the magnesium aluminum alloy from burning in a cast mould in casting, and ensures sequential cooling of the magnesium aluminum alloy so as to improve feeding effect during solidification of the magnesium aluminum alloy, thus producing the magnesium aluminum alloy casting with small surface but without internal crystallographic direction defect and oxide scale.

Description

technical field [0001] The invention relates to a magnesium alloy casting mold flux, in particular to a mold flux integrating thermal insulation, flame retardancy and coating performance, and belongs to the technical field of metal casting. Background technique [0002] As we all know, the chemical properties of magnesium are very active, and liquid magnesium can easily react with oxygen, nitrogen in the atmosphere and water in the mold. The surface films such as magnesium oxide and magnesium nitride formed as a result of the reaction have low density coefficients and poor thermal conductivity, and the large amount of heat released by the reaction cannot be dissipated quickly, resulting in a rapid rise in temperature on the reaction interface and accelerated oxidation of magnesium, which intensifies Magnesium burning. As a result, holes or oxide wrinkles appear on the surface of the casting, and in severe cases, the casting is scrapped. Therefore, preventing the combustion...

Claims

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Application Information

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IPC IPC(8): B22D21/04
Inventor 刘弘
Owner 大连核心铸造技术工程研究所
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