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Magnesium alloy evaporative pattern casting coating and preparation method thereof

A technology of lost foam casting and magnesium alloy, applied in the field of metallurgy and materials, can solve problems such as unsatisfactory coating process performance, corrosion of factory buildings, damage to health, etc., to achieve clear outline, good flame retardancy and heat preservation, and good process performance Effect

Inactive Publication Date: 2015-07-08
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology pays too much attention to the flame retardancy of the coating, which leads to unsatisfactory process performance of the coating, and its flame retardant uses fluorine additives and sulfur, which will produce a large amount of fluoride gas and SO during the pouring process. 2 These harmful gases pollute the environment, seriously damage people's health, and corrode factory buildings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A magnesium alloy lost foam casting coating is characterized in that the mass percent of each component of the coating is: alumina powder 42%, diatomite 5%, polyvinyl alcohol 1.5%, carboxymethyl cellulose sodium 0.6%, phosphoric acid Aluminum dihydrogen 4%, white latex 4%, sodium dodecylsulfonate 1.2%, boric acid 2%, n-butanol 0.02%, and the balance is water. The preparation method is: heat 15 parts of polyvinyl alcohol with water, stir 0.75h to make solution A; heat 15 parts of carboxymethyl cellulose sodium with water and stir for 0.75h to make solution B; put alumina powder and diatomaceous earth into a ball mill for 1.5h, then add phosphoric acid Aluminum dihydrogen, white latex, sodium dodecylsulfonate, boric acid, n-butanol, A solution, B solution and appropriate amount of water are milled for 2.5 hours.

Embodiment 2

[0015] A magnesium alloy lost foam casting coating is characterized in that the mass percent of each component of the coating is: alumina powder 35%, diatomite 2%, polyvinyl alcohol 0.5%, carboxymethyl cellulose sodium 0.2%, phosphoric acid Aluminum dihydrogen 2%, white latex 2%, sodium dodecyl sulfonate 0.5%, boric acid 1%, n-butanol 0.01%, and the balance is water; the preparation method is to heat 10 parts of polyvinyl alcohol with water and stir for 0.5 h to prepare solution A; heat 10 parts of carboxymethylcellulose sodium into water and stir for 0.5 hours to prepare solution B; put alumina powder and diatomaceous earth into a ball mill for dry mixing for 1 hour, and then add dihydrogen phosphate Aluminum, white latex, sodium dodecyl sulfonate, boric acid, n-butanol, A solution, B solution and appropriate amount of water can be milled for 2 hours.

Embodiment 3

[0017] A magnesium alloy lost foam casting coating is characterized in that the mass percent of each component of the coating is: aluminum oxide powder 50%, diatomite 8%, polyvinyl alcohol 3%, carboxymethyl cellulose sodium 1.0%, phosphoric acid Aluminum dihydrogen 6%, white latex 6%, sodium dodecyl sulfonate 2%, boric acid 3%, n-butanol 0.03%, and the balance is water. The preparation method is to heat 20 parts of polyvinyl alcohol with water and stir for 1 hour , to make solution A; heat 20 parts of carboxymethylcellulose sodium with water, stir for 1 hour, and make solution B; put alumina powder and diatomaceous earth into a ball mill and dry mix for 2 hours, then add aluminum dihydrogen phosphate, White latex, sodium dodecyl sulfonate, boric acid, n-butanol, A solution, B solution and appropriate amount of water can be milled for 3 hours.

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Abstract

The invention relates to a magnesium alloy evaporative pattern casting coating and a preparation method thereof. The coating comprises the following components in percentage by mass: 30-50% of aluminum oxide powder, 2-8% of diatomite, 0.5-3% of polyvinyl alcohol, 0.2-1.0% of sodium carboxymethylcellulose, 2-6% of aluminum dihydrogen phosphate, 2-6% of a white emulsion, 0.5-2% of sodium dodecyl sulfate, 1-3% of boric acid, 0.01-0.03% of normal butanol and the balance of water. The coating provided by the invention has the beneficial effects that (1) the coating is free from harmful substances and does not cause the environmental pollution; (2) the coating not only has good flame retardance and heat insulation, but also has a relatively good process performance; (3) a magnesium alloy casting which is clear in contour and smooth in surface can be obtained by using the coating.

Description

technical field [0001] The invention relates to a lost foam casting paint, in particular to a magnesium alloy lost foam casting paint and a preparation method thereof, belonging to the field of metallurgy and materials. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength and specific stiffness, good damping and shock absorption, machinability, thermal conductivity, strong electromagnetic shielding ability, and easy recycling. The field has very broad application prospects. [0003] Lost foam casting is a new casting technology with nearly no allowance, precise forming and clean production, which is very suitable for magnesium alloy casting and forming. Due to the active chemical properties of magnesium, it is very easy to oxidize and burn, resulting in holes or oxidized wrinkle defects on the surface of the casting, and in severe cases, the casting will be scrapped; the heat capacity of magnesium is small, and the cooling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
Inventor 戴斌煜商景利尹键
Owner NANCHANG HANGKONG UNIVERSITY