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Hard alloy surface boronizing method

A cemented carbide and boronizing technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of poor boronizing effect, etc. The effect of improving the flexural strength

Active Publication Date: 2020-09-25
广东正信硬质材料技术研发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this invention is that the practical effect of boronizing is not good

Method used

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  • Hard alloy surface boronizing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for boronizing a cemented carbide surface, comprising the following steps:

[0022] (1) Sandblasting the cemented carbide to remove the oxide layer on the surface of the cemented carbide;

[0023] (2) Bake the graphite boat at 100°C for 1 hour to remove moisture, pour the boronizing agent into the graphite boat, embed the cemented carbide treated in step (1) in the boronizing agent, and then seal the boronizing container And put it into a box-type resistance furnace; the boronizing agent is composed of the following components by weight percentage: boron supplying agent 14%, activator 26%, and the balance is filler, wherein, the boron supplying agent is made of equal weight nitriding Composed of boron and boron carbide, the activator is composed of equal weight of potassium fluoroborate and pyrrolidinium tetrafluoroborate, and the filler is silicon carbide;

[0024] (3) Vacuumize the box-type resistance furnace until the vacuum degree is 100Pa, fill in nitroge...

Embodiment 2

[0028] A method for boronizing a cemented carbide surface, comprising the following steps:

[0029] (1) Sandblasting the cemented carbide to remove the oxide layer on the surface of the cemented carbide;

[0030] (2) Bake the graphite boat at 100°C for 1 hour to remove moisture, pour the boronizing agent into the graphite boat, embed the cemented carbide treated in step (1) in the boronizing agent, and then seal the boronizing container and put it into a box-type resistance furnace; the boronizing agent is composed of the following components by weight percentage: 10% boron supply agent, 30% activator, and the balance is filler, wherein, the boron supply agent is made of equal weight nitriding Composed of boron and boron carbide, the activator is composed of equal weight of potassium fluoroborate and pyrrolidinium tetrafluoroborate, and the filler is silicon carbide;

[0031] (3) Vacuumize the box-type resistance furnace until the vacuum degree is 100Pa, fill in nitrogen unti...

Embodiment 3

[0034] A method for boronizing a cemented carbide surface, comprising the following steps:

[0035] (1) Sandblasting the cemented carbide to remove the oxide layer on the surface of the cemented carbide;

[0036] (2) Bake the graphite boat at 100°C for 1 hour to remove moisture, pour the boronizing agent into the graphite boat, embed the cemented carbide treated in step (1) in the boronizing agent, and then seal the boronizing container and put it into a box-type resistance furnace; the boronizing agent is composed of the following components by weight percentage: 15% boron supply agent, 25% activator, and the balance is filler, wherein, the boron supply agent is made of equal weight nitriding Composed of boron and boron carbide, the activator is composed of equal weight of potassium fluoroborate and pyrrolidinium tetrafluoroborate, and the filler is silicon carbide;

[0037] (3) Vacuumize the box-type resistance furnace until the vacuum degree is 100Pa, fill in nitrogen unti...

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Abstract

The invention provides a hard alloy surface boronizing method. The method comprises the following steps that (1), sand blasting treatment is performed on a hard alloy, and an oxide layer on the surface of the hard alloy is removed; (2), a boronizing agent is poured into a boronizing container, the hard alloy treated in the step (1) is buried into the boronizing agent, and then the boronizing container is closed and put into a sintering furnace, wherein the boronizing agent is composed of the following components, by weight percentage, 10-15% of a boron supply agent, 25-30% of an activator andthe balance a filler, wherein the boron supply agent is composed of equal weight of boron nitride and boron carbide; the activator is composed of equal weight of potassium fluoborate and tetrafluoroboric acid pyrrolidine salt; the filler is silicon carbide; and (3), the sintering furnace is vacuumized until the vacuum degree is 100 Pa, inert gas is injected into the sintering furnace until the pressure in the sintering furnace reaches 0.07 MPa, heating starts to be performed, heat preservation is performed for 2-6 hours after the temperature is increased to 1,100-1,300 DEG C, heating is stopped, and then the temperature is cooled to the room temperature. By the adoption of the hard alloy surface boronizing method, a boronizing layer formed by the method is large in thickness, and the hardness, the wear resistance, the bending strength and the toughness of the hard alloy can be effectively improved.

Description

technical field [0001] The invention relates to a boronizing method on the surface of cemented carbide. Background technique [0002] The post-treatment of cemented carbide sintering generally refers to the mechanical, physical and chemical methods adopted to make the geometric shape, precision and roughness of the product meet the requirements of use, and to further strengthen certain properties of the material, or a combination of these methods These are the main technical development directions in the field of cemented carbide at present. At present, the widely used post-processing technologies mainly include grinding, coating, heat treatment, cryogenic treatment, laser treatment, ion implantation, polishing, boronizing and so on. Among them, boronizing can improve the service life, wear resistance and hardness of cemented carbide without reducing the service strength of cemented carbide. Therefore, boronizing process has received widespread attention at home and abroad ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/68
CPCC23C8/68
Inventor 叶惠明叶少良叶戈诸优明
Owner 广东正信硬质材料技术研发有限公司
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