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Hard alloy vacuum anti-sticking coating

A technology of anti-adhesive coatings and hard alloys, which is applied in the direction of polyether coatings, coatings, and devices for coating liquid on the surface, can solve the problems of unhealthy operators and high labor intensity, and reduce production costs and labor. Strength, the effect of improving the product qualification rate

Inactive Publication Date: 2009-09-02
ZHUZHOU JINGGONG CEMENTED CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now there are coatings composed of carbon black, polyethylene glycol, Tween, formaldehyde, negative ion water, etc. During the application, there is no surface fouling, carburization, and decarburization of the product, and the problem of sticking boats is also partially solved. The type of paint must be scraped off and repainted after each use, which is labor-intensive, and formaldehyde is very harmful to the health of the operator

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: 25% of high-purity carbon black, polyethylene glycol 2%, n-butanol 1%, zirconia 1%, negative ion water 59%, Tween 80 12%.

Embodiment 2

[0023] Embodiment 2: high-purity carbon black 22%, polyethylene glycol 4%, n-butanol 1.5%, zirconium oxide 1%, negative ion water 57.5%, Tween 80 14%.

Embodiment 3

[0024] Embodiment 3: high-purity carbon black 30%, polyethylene glycol 3%, n-butanol 2%, zirconium oxide 2%, negative ion water 51%, Tween 80 12%.

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PUM

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Abstract

The invention relates to a coating for preventing hard carbide from sticking to the boat in the process of vacuum and low-pressure sintering. The coating comprises high purity soot (20-30% in mass), polyethylene glycol (2-4%), defoamer (0.5-2%), metal oxide (0.5-2%), anionic water (48-60%) and Tween-80 (10-15%). The invention has the advantages that hard carbide does not stick to the boat in sintering and the products do not bend or deform. The single coating layer can be used five to eight times, so the production cost and labor intensity are reduced, while the product qualification rate is raised.

Description

technical field [0001] The invention relates to a paint for preventing boat sticking during vacuum sintering and low-pressure sintering of cemented carbide. Background technique [0002] Cemented carbide powder is pressed into a product of a certain shape and size. After removing the forming agent, it is placed in a graphite boat and sintered in a vacuum sintering furnace or a low-pressure furnace to become a final cemented carbide product. If the compact is directly placed on the boat, due to the diffusion and migration between atoms at high temperature, especially in vacuum and high temperature, the wetting angle between cobalt and graphite is very small, so that the cemented carbide product and the boat Bonding occurs between them, resulting in inconsistent shrinkage and deformation, causing the product to bend and deform, which seriously affects the accuracy of the product. Severe sticking of boats has led to carburization of the product, resulting in waste products. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D171/08C09D7/12B05D7/14
Inventor 陈明
Owner ZHUZHOU JINGGONG CEMENTED CARBIDE