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A kind of coating for aluminum alloy low pressure casting metal mold

A technology of low-pressure casting and metal molding, which is applied in the field of casting and low-pressure casting of aluminum alloys. It can solve the problems of poor thermal insulation performance, time-consuming, high cost of raw materials, etc., and achieve the effects of smooth surface of castings, easy use and wide sources.

Active Publication Date: 2016-02-03
江苏华江科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the obvious defects of this technology are: ① It is troublesome and time-consuming to mix and prepare coatings; ② The cost of raw materials is high, which affects product benefits; Causes the cavity to stick and burn; ④The surface quality of the produced castings is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A coating for aluminum alloy low-pressure casting metal molds, the composition of the coating is: 200-280 mesh mullite powder 35%, 200-280 mesh alumina powder 10%, 200-280 mesh sodium bentonite 5.5% %, polyvinyl alcohol 2.5%, sodium alginate 0.8%, silica sol 4.0%, sodium dodecylbenzenesulfonate 0.8%, and the balance is water.

Embodiment 2

[0019] A coating for aluminum alloy low-pressure casting metal molds. The coating is composed of, by mass fraction: 45% of 200-280 mesh mullite powder, 5% of 200-280 mesh alumina powder, 6.5% of 200-280 mesh sodium bentonite %, polyvinyl alcohol 2.0%, sodium alginate 1.0%, silica sol 3.5%, sodium dodecylbenzenesulfonate 1.0%, and the balance is water.

Embodiment 3

[0021] A coating for aluminum alloy low-pressure casting metal molds. The coating is composed of, by mass fraction: 200-280 mesh mullite powder 40%, 200-280 mesh alumina powder 8%, 200-280 mesh sodium bentonite 6 %, polyvinyl alcohol 2.3%, sodium alginate 0.9%, silica sol 3.8%, sodium dodecylbenzenesulfonate 0.9%, and the balance is water.

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Abstract

The invention discloses a coating for a metal mold used in aluminum alloy low pressure casting. The coating comprises: by mass, 35 to 45% of 200 to 280 meshes of mullite powder, 5 to 10% of 200 to 280 meshes of alumina powder, 5.5 to 6.5% of 200 to 280 meshes of sodium bentonite, 2.0 to 2.5% of polyvinyl alcohol, 0.8 to 1.0% of sodium alginate, 3.5 to 4.0% of silica sol, 0.8 to 1.0% of sodium dodecyl benzene sulfonate and the balance water.

Description

technical field [0001] The invention relates to the field of casting, in particular to the technical field of low-pressure casting aluminum alloys. Background technique [0002] There are many types of metal casting coatings, which are mainly distinguished by coating binders and high temperature resistant fillers. Commonly used binders include syrup, water glass, and polymer binders such as resins and polyvinyl alcohol. High temperature resistant fillers are black lead powder, spray carbon black, coke powder, high aluminum powder, etc. Commonly used syrup paint ingredients are: black lead powder > 30%, spray carbon black > 45%, syrup > 15%. After mixing these materials, put them in a rotary mixer, add an appropriate amount of water, and stir thoroughly for 1.5-2 hours. The paint density is required to be 1.2-1.3g / cm 3 between. Commonly used water glass binder coating components are: 80% carbon black, 20% water glass and an appropriate amount of water, density 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22D18/04
Inventor 许立新
Owner 江苏华江科技有限公司