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Anti-sticking coating for vacuum sintering of hard alloy and preparation method of anti-sticking coating

A technology of vacuum sintering and anti-stick coating, which is applied in the direction of coating, etc., can solve the problem of scrapping workpieces and achieve the effect of avoiding scrapping

Inactive Publication Date: 2014-09-03
DONGGUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For cemented carbide, it generally includes refractory metal compounds and bonding metals, such as cobalt, nickel, etc.; in the cemented carbide processing industry, as an important sintering equipment, vacuum carbon tube sintering furnace is used Widely used; for cemented carbide, in the actual sintering process, the cemented carbide workpiece is easily bonded to the carbon boat used to hold the workpiece, which will cause the workpiece to be scrapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, a kind of anti-stick coating for cemented carbide vacuum sintering, includes the following material components, specifically:

[0034] Industrial alcohol 1000ml

[0035] Carbon black powder 100g

[0036] Aluminum oxide powder 200g;

[0037] Among them, for carbon black powder, the particle size is 15um, and the specific surface area is 250-300m 2 / g, the specific gravity is 1.8-2.1g / cm 3 , the tinting strength is 125%, and the DBP oil absorption value is 68×10 -5 m 3 / kg, PH value is 7-8, ash content≦0.1﹪;

[0038] For alumina powder, the particle size is 10-30um, the content of alumina is ≧99.5%, SiO 2 content of ≤0.03%, Fe 2 o 3 The content of ≤0.02%, Na 2 O content ≤ 0.03%, the true specific gravity is 3.5g / cm 3 , the forming density is 2.3 g / cm 3 , the linear shrinkage rate is 15.0﹪;

[0039] For industrial alcohol, the industrial alcohol is a colorless, transparent, odorless liquid, ethanol content (20°C) ≥ 96.0% (V / V), sulfuric acid test ...

Embodiment 2

[0042] Embodiment 2, a kind of anti-stick coating for cemented carbide vacuum sintering, includes the following material components, specifically:

[0043] Industrial alcohol 900ml

[0044] Carbon black powder 80g

[0045] Aluminum oxide powder 160g;

[0046] Among them, for carbon black powder, the particle size is 15um, and the specific surface area is 250-300m 2 / g, the specific gravity is 1.8-2.1g / cm 3 , the tinting strength is 125%, and the DBP oil absorption value is 68×10 -5 m 3 / kg, PH value is 7-8, ash content≦0.1﹪;

[0047] For alumina powder, the particle size is 10-30um, the content of alumina is ≧99.5%, SiO 2 content of ≤0.03%, Fe 2 o 3 The content of ≤0.02%, Na 2 O content ≤ 0.03%, the true specific gravity is 3.5g / cm 3 , the forming density is 2.3 g / cm 3 , the linear shrinkage rate is 15.0﹪;

[0048] For industrial alcohol, the industrial alcohol is a colorless, transparent, odorless liquid, ethanol content (20°C) ≥ 96.0% (V / V), sulfuric acid test nu...

Embodiment 3

[0051] Embodiment 3, a kind of anti-adhesive coating for cemented carbide vacuum sintering, including the following material components, specifically:

[0052] Industrial alcohol 1100ml

[0053] Carbon black powder 120g

[0054] Alumina powder 240g;

[0055] Among them, for carbon black powder, the particle size is 15um, and the specific surface area is 250-300m 2 / g, the specific gravity is 1.8-2.1g / cm 3 , the tinting strength is 125%, and the DBP oil absorption value is 68×10 -5 m 3 / kg, PH value is 7-8, ash content≦0.1﹪;

[0056] For alumina powder, the particle size is 10-30um, the content of alumina is ≧99.5%, SiO 2 content of ≤0.03%, Fe 2 o 3 The content of ≤0.02%, Na 2 O content ≤ 0.03%, the true specific gravity is 3.5g / cm 3 , the forming density is 2.3 g / cm 3 , the linear shrinkage rate is 15.0﹪;

[0057] For industrial alcohol, the industrial alcohol is a colorless, transparent, odorless liquid, ethanol content (20°C) ≥ 96.0% (V / V), sulfuric acid test num...

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Abstract

The invention discloses an anti-sticking coating for vacuum sintering of a hard alloy and a preparation method of the anti-sticking coating. The anti-sticking coating for the vacuum sintering of the hard alloy comprises the following materials: 900-1100 ml of industrial alcohol, 80-120 g of carbon black powder and 160-240 g of alumina powder. The anti-sticking coating for the vacuum sintering of the hard alloy, which is disclosed by the invention, can be used for completely isolating a hard alloy workpiece from the surface of a carbon boat during sintering through the combination of the materials, thereby avoiding the phenomenon of hard alloy workpiece scrapping caused due to adhesion. The preparation method of the anti-sticking coating for the vacuum sintering of the hard alloy comprises the steps: mixing and stirring the materials; statically standing; brushing; and naturally drying. The preparation method disclosed by the invention can be used for effectively generating the anti-sticking coating layer structure on the surface of the carbon boat through process step design. The anti-sticking coating layer structure can be used for completely isolating the hard alloy workpiece from the surface of the carbon boat during the sintering, thereby avoiding the phenomenon of hard alloy workpiece scrapping caused due to the adhesion.

Description

technical field [0001] The invention relates to the technical field of cemented carbide sintering processing, in particular to an anti-adhesive coating for cemented carbide vacuum sintering and a preparation method thereof. Background technique [0002] For cemented carbide, it generally includes refractory metal compounds and bonding metals, such as cobalt, nickel, etc.; in the cemented carbide processing industry, as an important sintering equipment, vacuum carbon tube sintering furnace is used Widely used; for cemented carbide, in the actual sintering process, the cemented carbide workpiece is easily bonded to the carbon boat used to hold the workpiece, which will cause the workpiece to be scrapped. Contents of the invention [0003] The purpose of the present invention is to provide a kind of anti-stick coating for cemented carbide vacuum sintering in view of the deficiencies in the prior art. The surface is completely isolated, which can effectively avoid the scrappi...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/12
Inventor 陈勇志
Owner DONGGUAN UNIV OF TECH
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