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High vacuum gas boronization

A technology of gas infiltration and vacuum furnace, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., and can solve the problems of high cutting temperature, high price and high cost of boron carbide iron powder

Inactive Publication Date: 2009-06-17
SUZHOU WANTAI VACUUM FIRING FURNACE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High labor intensity, poor workpiece conditions, high cost, slow boronizing speed, expensive iron boron carbide powder, long thermal diffusion time, high cutting temperature, shallow infiltration layer, etc.

Method used

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Examples

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Embodiment Construction

[0004] Gas boronizing adopts a cold-wall resistance vacuum furnace, using boron trichloride and hydrogen as an agent in a certain volume ratio to control a certain gas flow rate (related to the size of the furnace and the amount of charge). The vacuum degree is controlled within the specified range. Below this range, the thickness of the infiltrated layer increases with increasing pressure. When the boronizing temperature is within a certain range, the thickness of the boronizing layer increases with the increase of the holding time.

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Abstract

The invention provides a method for improving quality in boronizing industry, which is characterized in that boron element is infiltrated in the surface of the steel, thus forming an extremely hard boride layer on the surface, thereby improving the hardness of the die. Compared with other normal methods, the method has quick boronizing speed and good infiltration quality and improves the quality of the product.

Description

Technical field: [0001] The invention is a practical method in the modern surface chemical heat treatment industry. Background technique: [0002] Today's boronizing is a new type of heat treatment process developed in modern times, but it refers to the chemical heat treatment of steel or other alloys diffused into boron to obtain iron borides. The brittleness of the carburized layer also limits its application range. Powder solid boronizing is a boronizing process in which the workpiece is boronized in a medium of powder or particles, sealed, heated and kept warm. High labor intensity, poor workpiece conditions, high cost, slow boronizing speed, expensive iron boron carbide powder, long thermal diffusion time, high cutting temperature, shallow infiltration layer, etc. Invention content: [0003] The invention mainly refers to passing the gas boronizing agent into the cold-wall resistance vacuum furnace group for cracking and decomposition to generate active boron atoms,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/08
Inventor 顾啸强
Owner SUZHOU WANTAI VACUUM FIRING FURNACE RES INST
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