Sand core quenching coating for aluminum alloy casting and preparation method thereof
A technology of foundry sand and chilled paint, which is applied in foundry molding equipment, metal processing equipment, coating and other directions, can solve the problems of scrapped castings, insignificant effects, unqualified surface quality of castings, etc., and achieve improved strength and smooth surface. , the effect of improving the yield
Active Publication Date: 2020-08-25
SHANDONG HONGYUAN NEW MATERIALS CO LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
Chilled coatings contain tellurium elements. At high temperatures, tellurium vapor is very easy to react with oxygen elements in silica sand or other coating layers, thus forming chemical sticky sand, resulting in unqualified surface quality of castings, requiring subsequent grinding and other processing procedures, reducing Production efficiency, if the sticky sand occurs in a complex inner cavity, the casting will be scrapped because the sticky sand cannot be cleaned; in addition, in actual industrial casting, when the coating containing tellurium powder is used for iron castings, tellurium can quickly penetrate into the molten iron, Solidification forms a dense white layer, thereby improving the yield of the product, but when used in aluminum alloy castings, the effect is not obvious
Method used
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Embodiment 1
[0026] The mass percentage of raw materials is: 38% of carbon fiber powder, 42% of aluminum powder, 12% of zinc oxide powder, 2% of iron oxide powder, 5% of lithium-based bentonite, and 1% of phenolic resin.
[0027] First add water to the paint mixer, turn on the equipment and then add carbon fiber powder, aluminum powder, zinc oxide powder, iron oxide powder, lithium-based bentonite, phenolic resin, and stir for 20 hours to get the sand core chilled coating for aluminum alloy casting.
Embodiment 2
[0029] The mass percent of raw materials is: 42% of carbon fiber powder, 38% of aluminum powder, 8% of zinc oxide powder, 3% of iron oxide powder, 7% of lithium-based bentonite, and 2% of phenolic resin.
[0030] First add water to the paint mixer, turn on the equipment, add carbon fiber powder, aluminum powder, zinc oxide powder, iron oxide powder, lithium-based bentonite, phenolic resin in sequence, and stir for 24 hours to get the sand core chilled coating for aluminum alloy casting.
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Abstract
The invention relates to the technical field of casting materials, in particular to a sand core chilling coating for aluminum alloy casting and a preparation method thereof. The sand core chilling coating for aluminum alloy casting is composed of carrier liquid and a main raw material, the carrier liquid is water, and the main raw material is composed of the following raw materials including, by mass, 38%-42% of carbon fiber powder, 38%-42% of aluminum powder, 8%-12% of zinc oxide powder, 2%-4% of iron oxide powder, 5%-7% of lithium-based bentonite and 1%-2% of phenolic resin. The coating is non-toxic and environment-friendly, the operating environment, fire resistance, suspension stability and painting performance are all better than those of an alcohol-based coating, the sand core chilling coating is suitable for aluminum alloy casting, local molten aluminum solidification speed can be accelerated, the shrinkage tendency is reduced, and the product yield is significantly improved. The invention also provides a preparation method for the sand core chilling coating.
Description
technical field [0001] The invention relates to the technical field of casting materials, in particular to a sand core quenching coating for aluminum alloy casting and a preparation method thereof. Background technique [0002] At present, in the process of aluminum alloy low-pressure casting and gravity casting, due to product design reasons, there are often designs such as bosses, straps, and reinforcing ribs, resulting in local thick hot spots. If there is an inner cavity at the thick hot joint, sand cores are required to cast it out, and because the heat conduction of the sand core is slow, the solidification speed of the thick hot joint is slow, and the shrinkage cavity at the hot joint is very easy to occur, and the product is scrapped due to shrinkage , The production yield is low. [0003] The quality of the working surface where the sand core is in direct contact with the molten metal has a very important impact on the quality of the casting. Coating the surface of...
Claims
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IPC IPC(8): B22C3/00
Inventor 李兴华周仕勇
Owner SHANDONG HONGYUAN NEW MATERIALS CO LTD