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Metal surface hardening method

A metal surface, rare earth compound technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem of low density of infiltration layer, many hole defects, hardness and wear resistance of infiltration layer. Demand and other issues, to achieve the effect of high boron potential, improved infiltration ability, improved metal surface hardness and wear resistance

Active Publication Date: 2022-08-02
CHANGSHA TOPWELLWEAR METAL MATERIAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Boronizing is also a very effective surface strengthening method for various metal materials, which can greatly improve its surface hardness and wear resistance and corrosion resistance. At present, boronizing hardening methods on metal surfaces can be divided into solid method, liquid method, gas method, and plasma method. Body method, paste method, etc., the most widely used method for metal materials is the solid method (powder embedding method). Since the radius of boron atoms is much larger than that of carbon atoms and nitrogen atoms, the penetration rate of boron is lower than that of carburizing and carburizing. Nitrogen speed, at present, the density of the carburized layer obtained by solid method boronizing is low, there are many holes and defects, and the hardness and wear resistance of the carburized layer are also difficult to meet the needs of use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A metal surface hardening method:

[0027] 3000g of borax, 300g of boric acid, 400g of lanthanum oxide, 400g of lanthanum chloride, 100g of lanthanum aluminate, 2000g of silicon carbide and 3000g of graphite were vacuum-sealed in a closed tank, placed on a ball mill at room temperature for ball milling and powder mixing. The ratio is 50:1. After the ball milling is completed for 4 hours, 500 g of ammonium chloride and 650 g of sodium fluoride are added to the tank as infiltration agents, then vacuum-sealed, and placed on a ball mill to continue ball milling. After ball milling for 8 hours, the infiltration agent is obtained. 10wt% oxalic acid solution is used to clean the surface of TC4 titanium alloy to remove rust and oil, then wash and dry it for use, put the TC4 titanium alloy and the infiltrating agent into the graphite mold, bury the TC4 titanium alloy in the infiltrating agent, and seal the graphite mold. Put it into a resistance furnace for heating and impregnat...

Embodiment 2

[0031] A metal surface hardening method:

[0032] 3000g of borax, 500g of boric acid, 400g of lanthanum oxide, 400g of lanthanum chloride, 200g of lanthanum aluminate, 2000g of silicon carbide and 3000g of graphite were vacuum-sealed in a closed tank, placed on a ball mill at room temperature for ball milling and powder mixing. The ratio is 50:1. After the ball milling is completed for 4 hours, 500 g of ammonium chloride and 650 g of sodium fluoride are added to the tank as infiltration agents, then vacuum-sealed, and placed on a ball mill to continue ball milling. After ball milling for 8 hours, the infiltration agent is obtained. 10wt% oxalic acid solution is used to clean the surface of TC4 titanium alloy to remove rust and oil, then wash and dry it for use, put the TC4 titanium alloy and the infiltrating agent into the graphite mold, bury the TC4 titanium alloy in the infiltrating agent, and seal the graphite mold. Put it into a resistance furnace for heating and impregnat...

Embodiment 3

[0036] A metal surface hardening method:

[0037] 3000g of borax, 300g of boric acid, 400g of lanthanum oxide, 400g of lanthanum chloride, 200g of lanthanum aluminate, 2000g of silicon carbide and 3000g of graphite were vacuum-sealed in a closed tank, placed on a ball mill at room temperature for ball milling and powder mixing. The ratio is 50:1. After the ball milling is completed for 4 hours, 500 g of ammonium chloride and 650 g of sodium fluoride are added to the tank as infiltration agents, then vacuum-sealed, and placed on a ball mill to continue ball milling. After ball milling for 8 hours, the infiltration agent is obtained. 10wt% oxalic acid solution is used to clean the surface of TC4 titanium alloy to remove rust and oil, then wash and dry it for use, put the TC4 titanium alloy and the infiltrating agent into the graphite mold, bury the TC4 titanium alloy in the infiltrating agent, and seal the graphite mold. Put it into a resistance furnace for heating and impregnat...

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Abstract

The invention relates to the technical field of metal surface treatment, in particular to a metal surface hardening method, which comprises the following steps of: derusting and deoiling a metal surface by using an oxalic acid solution, filling metal and a permeating agent into a graphite mold, embedding the metal into the permeating agent, sealing the graphite mold, and heating and infiltrating in a resistance furnace, and after furnace cooling to the room temperature, quenching at the temperature of 600-650 DEG C and tempering treatment at the temperature of 220-240 DEG C. The hardness of the metal surface treated through the method is increased, the wear resistance is improved, and it can be known through comparison that the addition of the rare earth compound and the permeation accelerant plays a positive role in increasing the depth of a boriding layer and improving the hardness and the wear resistance.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a metal surface hardening method. Background technique [0002] In the metal smelting process, it is often necessary to harden the metal surface to improve wear resistance, corrosion resistance, heat resistance and fatigue strength. Commonly used surface hardening methods are: carburizing quenching, nitriding, surface quenching, etc. Boronizing is also a very effective surface strengthening method for various metal materials, which can greatly improve its surface hardness and wear resistance and corrosion resistance. At present, metal surface boronizing hardening methods can be divided into solid method, liquid method, gas method, plasma method The solid method (powder embedding method) is currently the most commonly used method for metal materials. Since the radius of boron atoms is much larger than that of carbon atoms and nitrogen atoms, the infiltration rate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/62
CPCC23C8/62
Inventor 彭宇清彭智虎
Owner CHANGSHA TOPWELLWEAR METAL MATERIAL SCI
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