Casting coating with variational heat content for aluminum alloy thin wall part
A metal mold casting and enthalpy-changing coating technology, which is applied to casting molding equipment, metal processing equipment, coatings, etc., can solve problems that do not involve the layered coating method of multi-layer enthalpy-changing coatings, and achieve the ability of metal liquid filling Effects of improvement, elimination of influence, reduction of dendrite spacing
Inactive Publication Date: 2006-05-03
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
The literature does not involve the layered coating method of multi-layer enthalpy change coatings and how to solve the influence of certain harmful components in enthalpy change coatings on castings
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[0015] Aiming at defects such as cold shut and insufficient pouring in the casting process of aluminum alloy A357 thin-walled parts, by heating the coating during the molten metal pouring process, an exothermic reaction occurs in the coating to improve the filling capacity of the molten metal. An enthalpy change coating utilizing the exothermic reaction of ferric oxide and magnesium powder was designed. Ferric oxide is produced by hydrolysis of ferric chloride.
[0016] A layered coating method of enthalpy change coating suitable for the exothermic reaction of ferric oxide and magnesium powder was designed.
[0017] 1) The first layer is coated with thinner zinc oxide paint to separate Fe 2 o 3 layer with the mold to prevent Fe 2 o 3 The damage caused by the introduction of the mold is also separated due to the Fe 2 o 3 The damage caused by the reaction of layer and Mg powder to the mold. The composition ratio (wt%) of the first layer of zinc oxide paint is as follows: ...
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The invention discloses an enthalpy-changing coating for metal mold casting of aluminum alloy thin-walled parts, which is characterized in that it contains FeCl 3 , magnesium powder, zinc oxide and water glass; the mass percentage of the first layer of paint composition is: zinc oxide: water glass: water=14: 4: 82; the second layer of paint is FeCl 3 Aqueous solution containing pure FeCl 3 15-20%, and the binder content is 4-8%; the mass percentage of the third layer of paint components is: zinc oxide: magnesium powder: water glass: water=10:6:4:80. Because the present invention uses the exothermic reaction of ferric oxide and magnesium powder, the metal liquid filling ability in the aluminum alloy pouring process is significantly improved. Compared with the zinc oxide coating, the improvement of the metal liquid filling ability reaches 39.2%. The cooling rate is increased; the secondary dendrite spacing of the casting is reduced; the application of layered coating method can eliminate the influence of the reaction of ferric oxide and magnesium powder on the mold, and can also eliminate the impact of ferric oxide on the molten metal. Pollution.
Description
technical field [0001] The invention relates to an enthalpy change coating for metal mold casting of aluminum alloy thin-walled parts. Background technique [0002] Due to the rapid cooling rate of thin-walled castings in metal mold casting, the castings are scrapped due to defects such as cold shut and insufficient pouring. solved problem. Coating is a very important auxiliary material in the casting process, and its performance often determines the quality and performance of the casting after completion. [0003] The document "Casting", 1988, (3): 1-4 "Surface Regulation of Casting Coatings" by Zhu Chunxi et al. introduces the proposal of enthalpy-changing coatings and the goals they want to achieve. Enthalpy change coatings are generally used to improve the cooling sequence and cooling rate of various parts in the casting. In order to adjust the solidification speed of the casting, it is not enough to rely solely on the heat storage and heat transfer of the refractory ...
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IPC IPC(8): B22C3/00
Inventor 介万奇何志陈忠伟郝启堂华慧
Owner NORTHWESTERN POLYTECHNICAL UNIV