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Investment precision casting composite coating

A technology of investment precision casting and composite molding, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc., to achieve the effects of reducing preparation costs, shrinkage reduction, and easy gelation

Inactive Publication Date: 2017-11-03
HEFEI CITY TENVER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the existing problems and provide a composite coating for investment casting. On the basis of nitrides with excellent properties, an appropriate amount of yttrium oxide powder is added, and the powder-to-liquid ratio of the coating is greatly improved. The thickness of the paint does not increase, so that the shrinkage of the paint is reduced when it is dried, cracks are eliminated, the density is increased, the storage performance is good, the service life is extended, the preparation cost of the shell is reduced, and the deficiency of the single nitride is made up.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A compound coating for investment casting precision casting, which contains the following components in parts by weight: 35 parts of silicon nitride powder, 30 parts of boron nitride powder, 15 parts of aluminum nitride powder, 25 parts of yttrium oxide powder, and 4 parts of zircon powder , 2 parts of mullite powder, 70 parts of yttrium gel, 1 part of surfactant, 30 parts of octanol, and its preparation method is: carry out hot pressing sintering treatment to above-mentioned nitride powder, and yttrium oxide powder, zircon powder, Mo Put stone powder, yttrium gel, surfactant, and octanol into yttrium sol, and stir evenly.

[0015] As a further improvement to the above scheme, the nitride powder treatment method is: using magnesium oxide and tin oxide as sintering aids, applying 300 kg / cm2 at 1650°C 2 The pressure is high to obtain a high-pressure sintered body, which can be ground to a range of 0.1-0.3 microns.

[0016] As a further improvement to the above scheme, th...

Embodiment 2

[0020] A compound coating for investment casting precision casting, which contains the following components in parts by weight: 40 parts of silicon nitride powder, 32 parts of boron nitride powder, 20 parts of aluminum nitride powder, 28 parts of yttrium oxide powder, and 5 parts of zircon powder , 2.5 parts of mullite powder, 75 parts of yttrium gel, 1.5 parts of surfactant, 35 parts of octanol, and its preparation method is: the above-mentioned nitride powder is carried out hot pressing sintering treatment, and yttrium oxide powder, zircon powder, Mo Put stone powder, yttrium gel, surfactant, and octanol into yttrium sol, and stir evenly.

[0021] As a further improvement to the above scheme, the nitride powder treatment method is: using magnesium oxide and tin oxide as sintering aids, applying 320 kg / cm2 at 1680°C 2 The pressure is high to obtain a high-pressure sintered body, which can be ground to a range of 0.1-0.3 microns.

[0022] As a further improvement to the above...

Embodiment 3

[0026] A compound coating for investment casting precision casting, which contains the following components in parts by weight: 45 parts of silicon nitride powder, 35 parts of boron nitride powder, 25 parts of aluminum nitride powder, 30 parts of yttrium oxide powder, and 6 parts of zircon powder , 3 parts of mullite powder, 80 parts of yttrium gel, 2 parts of surfactant, 40 parts of octanol, and its preparation method is: carry out hot pressing sintering treatment to above-mentioned nitride powder, and yttrium oxide powder, zircon powder, Mo Put stone powder, yttrium gel, surfactant, and octanol into yttrium sol, and stir evenly.

[0027] As a further improvement to the above scheme, the nitride powder treatment method is: using magnesium oxide and tin oxide as sintering aids, applying 350 kg / cm2 at 1700°C 2 The pressure is high to obtain a high-pressure sintered body, which can be ground to a range of 0.1-0.3 microns.

[0028] As a further improvement to the above scheme, t...

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PUM

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Abstract

The invention relates to the field of investment precision casting technology, and discloses a composite coating for investment precision casting. The nitride after hot pressing and sintering treatment does not react with solutions such as water, ethanol, acid and alkali, and can be bonded with various Adding an appropriate amount of yttrium oxide powder on the basis of nitrides with excellent properties without chemical reaction, the powder-liquid ratio of the coating is greatly improved, and the thickness of the coating does not increase, so that the shrinkage of the coating is reduced when it is dried. Cracks are eliminated, the density is increased, and the problem of easy gelling of yttrium oxide paint is solved. The preservation performance is good, the service life is extended, the preparation cost of the mold shell is reduced, and the deficiency of the single nitride is made up.

Description

technical field [0001] The invention belongs to the technical field of investment precision casting, and in particular relates to a composite coating for investment precision casting. technical background [0002] Investment casting, also known as lost wax casting, includes processes such as wax pressing, wax repairing, tree formation, dipping, melting wax, casting molten metal and post-processing. Lost wax casting is to use wax to make a wax mold of the part to be cast, and then coat the wax mold with mud, which is the mud mold. After the clay mold is dried, it is fired into a pottery mold. Once fired, all the wax molds are melted and lost, leaving only the pottery molds. Generally, when the mud mold is made, the sprue is left, and then the molten metal is poured into the sprue, and after cooling, the required parts are made. [0003] In investment casting production, coating characteristics and coating process have a direct impact on shell quality, casting quality, espe...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C9/04
CPCB22C3/00B22C9/04
Inventor 孙爱琴
Owner HEFEI CITY TENVER PRECISION CASTING
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