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Low thermoconductive paint for casting lost foam of thin wall cast

A technology of lost foam casting and thin-walled castings, which is applied to casting molding equipment, coatings, casting molds, etc. It can solve problems such as thermal cracking and cold insulation, and achieve the effects of improving rigidity and strength, good rigidity, and large specific heat capacity

Inactive Publication Date: 2013-05-15
中方阀业淅川制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a low thermal conductivity coating for lost foam casting of thin-walled castings with good wettability, good rigidity, low hygroscopicity and good shell-off performance, which effectively solves the problem of Casting defects such as hot cracks, cold shuts, insufficient filling, and pores that occur during lost foam casting of thin-walled castings can obtain castings with smooth and smooth surfaces and high surface quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The low thermal conductivity coating for thin-walled casting lost foam casting is prepared according to the following mass percentage of raw materials: 200 mesh quartz powder 70%, mica powder 5%, high alumina powder 25%, sodium bentonite 1%, composite bonding Agent 11%, wherein the composite binder is prepared from the following mass percentages of raw materials: PVA35%, silica sol 18%, CMC20%, sodium bentonite 18%, pulp powder 9%. For the first time, an appropriate amount of water is added for grinding, and for the second time, an appropriate amount of water is added for adjustment and stirring to prepare the low thermal conductivity coating. Paint suspension: 90-96%, air permeability: 0.9-1.1, strength: 620-690, viscosity: 22-26.

Embodiment 2

[0016] The low thermal conductivity coating for thin-walled casting lost foam casting is prepared according to the following mass percentage of raw materials: 50% of 200 mesh quartz powder, 15% of mica powder, 35% of high alumina powder, 0.3% of sodium bentonite, composite bonded Agent 7%. The composite binder is prepared according to the following mass percentages of raw materials: 38% PVA, 19% silica sol, 18% CMC, 19% sodium bentonite, and 6% pulp powder. For the first time, an appropriate amount of water is added for grinding, and for the second time, an appropriate amount of water is added for adjustment and stirring to prepare the low thermal conductivity coating.

Embodiment 3

[0018] The preferred low thermal conductivity coating for thin-walled casting lost foam casting is prepared from the following raw materials in mass percentage: 67% of 200 mesh quartz powder, 11% of mica powder, 11% of high alumina powder, 0.8% of sodium bentonite, compound Binder 9.5%. For the first time, an appropriate amount of water is added for grinding, and for the second time, an appropriate amount of water is added for adjustment and stirring to prepare the low thermal conductivity coating.

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PUM

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Abstract

The invention discloses a low thermal conductivity coating for thin-walled casting lost foam casting, which is characterized in that it is prepared from the following raw materials in mass percentage: 50-70% of quartz powder, 3-15% of mica powder, 10-10% of high-alumina powder 40%, sodium bentonite 0.3-1%, composite binder 7-11%. Compared with the existing technology, it has the advantages of low thermal conductivity, large specific heat capacity, and good air permeability, and effectively solves casting defects such as hot cracks, cold shuts, insufficient mold filling, and pores that occur during lost foam casting of thin-walled castings. At the same time, the coating has the advantages of good wettability, good rigidity, low hygroscopicity, and good peeling performance, and can obtain castings with smooth and smooth surfaces and high surface quality, which is suitable for lost foam casting of thin-walled castings.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a coating for preparing the lost foam of a high-strength and high-toughness nodular cast iron flywheel casing. Background technique [0002] The quality of castings mainly depends on the lost foam coating. The ratio of lost foam coating is a crucial process, so coating technology is one of the key technologies for the successful application of lost foam casting process. The lost foam casting coating should have the following main functions: ① increase the rigidity of the polystyrene (EPS) pattern, prevent the shape from being deformed during handling and molding; A good isolation layer between the filling sand and the filling sand prevents the occurrence of sticky sand defects; ③When the metal liquid is filling the mold, the gas generated by the pyrolysis of the foaming mold is discharged in a controlled manner, and the liquid pyrolysis generated during the pyrolysis ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22C9/04
Inventor 付宏阁
Owner 中方阀业淅川制造有限公司