Gypsum mold formula for casting magnesium alloy and preparation method thereof

A gypsum type and formula technology, which is applied in the field of magnesium alloy casting, can solve the problems of low mold strength, poor anti-oxidation effect, cracking, etc., and achieve the effect of smooth and bright surface, good anti-oxidation effect, and reduced water consumption

Inactive Publication Date: 2012-04-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, due to the large water consumption and other reasons of the traditional gypsum mold, the strength of the mold is small and the size deformation is large. In severe cases, it will cause wide cracks or even rupture of the mold; Poor, the surface quality of castings is poor, hindering the popularization of gypsum cast magnesium alloy

Method used

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preparation example Construction

[0019] A kind of preparation method of the gypsum formula for casting magnesium alloy of the present invention, specifically comprises the following steps:

[0020] The first step is to prepare a mixed solution: Weigh tap water at 100°C according to the ratio. Boiling water is to increase the solubility of additives. Pour the weighed magnesium sulfate, urea, trisodium phosphate, and barium chloride into the water, and use a stirring device to stir 30 minutes to completely dissolve the additive to make a mixed solution;

[0021] The second step is to prepare the gypsum mixed slurry; while stirring the mixed solution, sequentially add quartz powder, bauxite powder, flake graphite, and α-hemihydrate gypsum into the prepared mixed solution, stir for 2 minutes, and then add polycarboxylate Acid water reducer, defoamer, glass fiber, continue to stir for 2 minutes to complete pulping;

[0022] The third step is grouting: slowly stir the prepared gypsum mixed slurry manually to remov...

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Abstract

The invention discloses a gypsum mold formula for casting a magnesium alloy and a preparation method thereof, relating to preparation of a gypsum mold for casting a magnesium alloy. The gypsum mold formula comprises an additive component consisting of four basic components, including alpha-semihydrated gypsum, quartz powder, bauxite and magnesium sulfate as well as seven substances such as trisodium orthophosphate, barium chloride, a water reducing agent and the like. The invention further discloses a preparation method for the gypsum mold formula. Due to the adoption of scale graphite, oxidation of the magnesium alloy is effectively prevented; the water reducing agent is added into the formula, so that the fluidity of gypsum slurry is improved, the water consumption is lowered by 30 percent simultaneously, and the gypsum mold strength and drying efficiency are increased; the linear shrinkage of the gypsum mold can be remarkably lowered by using the gypsum mold formula together with barium chloride and urea; moreover, a solvent component consisting of tap water is adopted, so that the problems of high water consumption, poor fluidity, low strength, large size deformation, difficulty in breaking and the like existing in an ordinary gypsum mold are solved; and meanwhile, the problems of oxidization and combustion of the magnesium alloy are solved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy casting, in particular to a gypsum formula for magnesium alloy investment casting and its application, and is especially suitable for precision forming of complex thin-walled magnesium alloys. Background technique [0002] Die-casting is currently the most common forming process for magnesium alloys, but die-casting can only form castings with small dimensions and simple structures; due to the existence of pores, castings cannot be heat-treated or welded, nor can they be subjected to relatively deep machining; in addition, die-casting equipment The investment is high, the die-casting mold is complicated to manufacture, the cycle is long, and the cost is high. [0003] Traditional sand casting can form magnesium alloy castings with large size, complex shape and small wall thickness. It is currently a widely used forming process for large and complex magnesium alloy castings. However, due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C9/04B22C7/02
Inventor 董选普程鲁马戎李建军易成
Owner HUAZHONG UNIV OF SCI & TECH
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