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Coating for high bonding phase cemented carbide sintering

A cemented carbide, high-bonding technology, applied in the direction of fireproof coatings, coatings, etc., can solve problems such as carburizing and boat sticking

Active Publication Date: 2010-12-29
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the sticking and carburizing problems that cannot be completely solved by the current coating and anti-sticking methods, and improve the first pass rate of sintering large cemented carbide products with high binder phase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Aluminum oxide powder 58.3%; titanium oxide powder 5%; high-purity metallurgical carbon black 3.33%; methyl cellulose 0.37%; distilled water 33%.

[0017] This example is mainly applicable to WC-based cemented carbide with binder phase content ≥ 22%, such as our company's ZY28 (average binder phase content 24%), ZY26 (average binder phase content 26%) and ZY27 (average binder phase content Content 30%) and other grades of roll blanks.

Embodiment 2

[0019] Aluminum oxide powder 50%; zirconia powder 7%; high-purity metallurgical carbon black 6.0%; polyethylene glycol (PEG400) 3.4%; distilled water 33.6%.

[0020] This example is mainly applicable to WC-based cemented carbide with a binder phase content of 15% to 22% and TiC-WC cemented carbide with a binder phase content of 15-35%, such as our company's ZY29 (average binder phase content of 21%) , ZY30 (average binder phase content 19%), ZY31 (average binder phase content 17%), ZY32 (average binder phase content 15.5%) and other brands of roll blanks, as well as TiC-WC-based guide rolls and pinch rolls sintering.

Embodiment 3

[0022] Aluminum oxide powder 64.5%; magnesium oxide powder 2%; high-purity metallurgical carbon black 3.0%; hydroxyethyl methylcellulose 0.25%; distilled water 29.85%; ammonia water (25% by mass) 0.4%.

[0023] This example is suitable for small-sized cemented carbide products with a binder phase content of about 15%. Such as the sintering of our company's YG15 and other grades of plates.

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Abstract

The invention discloses a coating for high bonding phase cemented carbide sintering. The coating comprises the following components in percentage by mass: 55-69.5 percent of metal oxide powder, 2.85-6.1 percent of carbon black, 0.15-3.5 percent of water soluble adhesive (powder) and 27.5-38 percent of distilled water. When the coating prepared by utilizing the components is painted on a graphite sintering boat, the coating can effectively separate the direct contact between a high bonding phase cemented carbide sintering product and the graphite boat, prevent the occurrence of diffusion and migration of liquid phase and carbon between the sintered alloy and the graphite boat under the liquid phase sintering temperature and achieve the purposes of anti-bonding and anti-carburizing. The coating has the advantages of low cost, simple preparation and no pollution on a sintering furnace, no toxicity for an operator, no dust harm and easy cleaning and is an ideal coating for high bonding phase cemented carbide sintering.

Description

technical field [0001] The invention relates to a coating for cemented carbide sintering, in particular to a coating for cemented carbide sintering with high bonding phase. Background technique [0002] As far as the production of WC-based and TiC-WC-based cemented carbides with high binder phase (cobalt and nickel mass percentages are 15-35%) is concerned, the difficult production process control process is the final process of product rough production. 1. Sintering process control. Due to the high content of the binder phase (cobalt, nickel) in this type of alloy, and the binder phase has good wetting with graphite, the liquid phase and carbon will occur between the sintered alloy and the graphite boat at the liquid phase sintering temperature. The process of diffusion and migration will lead to sticking of sintered products and carburization of the alloy at the bottom of the contact boat, which will eventually affect the deformation and unqualified performance of the sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/00C09D5/18C22C1/05
Inventor 郑直彭晖郑成霞
Owner ZIGONG CEMENTED CARBIDE CORP
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