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High-temperature anti-adhesive coating for cemented carbide production and preparation method thereof

A cemented carbide and anti-stick coating technology, applied in the direction of coating, can solve problems such as poor anti-stick effect, and achieve the effect of superior performance and prevention of high temperature diffusion bonding

Active Publication Date: 2011-12-14
昆山长鹰硬质材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned cemented carbide sintering anti-stick coating is used for sintering of cobalt, nickel and other metal binders with a high binder phase cemented carbide with a content of 20wt%, and the anti-sticking effect is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the following composition ratio, the anti-adhesive coating for high temperature carbonization was prepared by traditional wet grinding process. The wet grinding process parameters are: cemented carbide grinding ball:material=5:1 (mass fraction), and the wet grinding time is 36h. Paint the new graphite boat after calcining 3 times, and paint the old graphite boat 2 times. After the paint is completely dry, put the mixed powder of FSSS of 11.0 μm coarse tungsten powder and carbon black directly into the graphite carbon tube. Carbonization at 1850°C in the furnace. After leaving the boat, it was found that there was no bonding between the tungsten carbide solidified block and the graphite boat, and the tungsten carbide solidified block could be easily detached from the boat. Use a wire brush to gently brush off the paint adherents on the surface of the consolidated block, and put the cleaned consolidated block into the barrel. Production practice has proved ...

Embodiment 2

[0028] According to the following composition ratio, the anti-adhesive coating for high temperature carbonization was prepared by traditional wet grinding process. The wet grinding process parameters are: cemented carbide grinding ball: material = 4:1 (mass fraction), and the wet grinding time is 48 hours. Paint the new graphite boat after calcination 3 times, and paint the old graphite boat 2 times. After the paint is completely dry, directly fill it with 0.035% cobalt-doped ultra-coarse tungsten powder with a FSSS of 30.5 μm. The mixed powder with carbon black is carbonized in a graphite carbon tube furnace at 2050°C. After leaving the boat, it was found that there was no bonding between the tungsten carbide solidified block and the graphite boat, and the tungsten carbide solidified block could be easily detached from the boat. Use a wire brush to gently brush off the paint adherents on the surface of the consolidated block, and put the cleaned consolidated block into the b...

Embodiment 3

[0036] According to the following composition ratio, the anti-adhesive coating for high temperature carbonization was prepared by high-efficiency stirring wet grinding process. The parameters of the wet grinding process are: cemented carbide grinding ball:material=7:1 (mass fraction), the stirring speed is 500rpm, and the wet grinding time is 10h. Paint the new graphite boat after calcination 3 times, and paint the old graphite boat 2 times. After the paint is completely dry, directly fill it with 0.03% cobalt-doped ultra-coarse tungsten powder with a FSSS of 28.5 μm. The mixed powder with carbon black is carbonized in a graphite carbon tube furnace at 2050°C. After leaving the boat, it was found that there was no bonding between the tungsten carbide solidified block and the graphite boat, and the tungsten carbide solidified block could be easily detached from the boat. Use a wire brush to gently brush off the paint adherents on the surface of the consolidated block, and put ...

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PUM

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Abstract

The invention discloses a high-temperature anti-adhesive coating for producing hard alloy and a preparation method thereof. The high-temperature anti-adhesive coating is used for carbonizing tungsten powder at high temperature and sintering hard alloy, and comprises 5 to 10 weight percent of rare-earth oxide anti-adhesive member, 15 to 20 weight percent of oxide B, 5 to 15 weight percent of high-purity carbon black isolated member, 3 to 5 weight percent of Tween, 3 to 5 weight percent of polyethylene glycol (PEG) and auxiliary film-forming members such as deionized water or ethanol and the like. The coating is prepared by a wet-milling process. When the high-temperature anti-adhesive coating is used for carbonizing the tungsten powder at the high temperature, the oxide B is tungstic oxide; and when the high-temperature anti-adhesive coating is used for sintering the hard alloy, the oxide B is magnesium oxide or aluminum oxide. When the high-temperature anti-adhesive coating is used for preparing coarse or ultra-coarse tungsten carbide powder by carbonization at a temperature of over 1,800 DEG C (high-temperature carbonization with cobalt), diffusion bonding between tungsten carbide consolidated blocks and a graphite boat can be prevented effectively; and when the high-temperature anti-adhesive coating is used for sintering the hard alloy, diffusion bonding between the hard alloy and particularly high-bonding phase hard alloy with the content of a metal bonding agent of more than or equal to 20 weight percent and the graphite boat can be prevented effectively.

Description

technical field [0001] The invention relates to an anti-adhesive coating, in particular to a high-temperature anti-adhesive coating for preventing high-temperature diffusion bonding between a graphite boat and a product, and also relates to a preparation method of the high-temperature anti-adhesive coating. Background technique [0002] Cemented carbide is produced by powder metallurgy and consists of refractory metal compounds (WC, TiC, TaC, NbC, etc.) and binder metals (Co, Ni, Fe, etc.), with a hard phase + binder phase structure Structural characteristics, engineering composite materials with optimal strength, hardness and toughness matching. Tungsten carbide is an important member of cemented carbide, and the grain size of cemented carbide mainly depends on the particle size of tungsten carbide powder. Coarse tungsten carbide powder is prepared by using tungsten powder with Fischer particle size (FSSS) > 10.0 μm as raw material, and the carbonization temperature is ...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/12
Inventor 张立吴厚平熊湘君黄兰萍陶辉锦
Owner 昆山长鹰硬质材料科技股份有限公司
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