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Thermal electron reinforced ionic boronizing device and process

A hot electron and ion infiltration technology, applied in the field of ion boronization, can solve the problems of inconvenient gas source supply, poor controllability of components, high labor intensity, etc., to expand the range of working air pressure, increase infiltration speed, and strong operability Effect

Inactive Publication Date: 2007-05-30
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid, liquid, and gas boronizing speed is slow, composition controllability is poor, and the environment is polluted
Paste boronizing, poor working conditions, poor controllability, high labor intensity, long processing time
Vacuum boronizing and gas ion boronizing equipment are complicated and costly, and the boron supply source is flammable and toxic gas, and the gas supply is inconvenient, etc.

Method used

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  • Thermal electron reinforced ionic boronizing device and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0020] As shown in the attached picture. Place a steel workpiece 3 with a size of 40mm×20mm (diameter×height) on a steel cathode tray 2 with a size of 80mm (diameter), and hang 6 pieces of steel with a size of 25mm×15mm×5mm (length×width×thickness) around it. The source electrode 4 of the iron-boron strip ensures that the distance between the iron-boron strips and between the iron-boron strip and the workpiece is 10cm-25cm. Vacuum up to 10 -1 After Pa, fill in argon gas to 50Pa, apply a voltage of -500V between the workpiece 3 and the vacuum container 5, and apply a voltage of -1000V between the workpiece 3 and the vacuum container 5, and apply a voltage of -1000V between the iron boron source electrode 4 and the vacuum container 5, and wait for the temperature of the workpiece to rise to 850°C. Keep warm for 2 hours, drop to room temperature, take out the sample out of the oven. The thickness of the boronizing layer on the surface of 45 steel workpiece is 0.03mm, and the su...

Embodiment approach 2

[0022] Furnace loading is the same as embodiment 1. The workpiece 3 is made of Ti6Al4V alloy, and the source 4 is made of boron iron. Vacuum up to 10 -1 After Pa, fill in argon gas to 50Pa, apply a voltage of -400V between the workpiece 3 and the vacuum container 5, and apply a voltage of -800V between the iron boron source 4 and the vacuum container 5, ignite the thermionic emission device, and reduce The pressure in the furnace is reduced to 3Pa, when the temperature of the workpiece is raised to 800°C, keep it warm for 2 hours, then drop to room temperature, and take out the sample from the furnace. The thickness of boron-iron co-infiltration layer on the surface of Ti6Al4V alloy workpiece is 0.01mm, and the surface hardness reaches 1100HV.

Embodiment approach 3

[0024] Furnace loading is the same as embodiment 1. The workpiece 3 is made of 20 steel, and the source 4 is made of boron nickel. Vacuum up to 10 -1 After Pa, fill in argon gas to 50Pa, apply a voltage of -600V between the workpiece 3 and the vacuum container 5, and apply a voltage of -1200V between the iron boron source electrode 4 and the vacuum container 5, ignite the thermionic emission device, and reduce The pressure in the furnace is reduced to 3Pa. When the temperature of the workpiece is raised to 950°C, the temperature is kept for 2 hours, and then it is lowered to room temperature, and the sample is taken out of the furnace. The thickness of the boron-iron co-infiltration layer on the surface of 20 steel workpiece is 0.04mm, and the surface hardness reaches 1000HV.

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Abstract

A thermal electron reinforced ionic boronizing device and a process thereof belongs to the category of metallic material surface chemistry heat treating process engineering, through which ion boronizing and boron-metalizing are executed by taking advantage of hollow cathode effect and thermal electron emission effect at surfaces of ferrous metal and non-ferro metals. There is also provided apparatus and method for ion boronizing by adopting solid metal boride as supplying source of boron. The hollow cathode effect and the thermal electron emission effect enhance the boronizing and the controllability thereof. Ferroboron, titanium-boron, chromium-boron, nickel-boron and the like are adopted as boride source materials to realize boronizing, and titanium-boronizing, chromium-boronizing and nickel-boronizing. The present invention privides hydrogen nonexistent boronizing glow-discharge technology and apparatus with conveniency of boron atomic formation, shortcut, without pollutions, uniform, controllable components, simple equipments and low cost.

Description

[0001] 1. Technology area [0002] The thermal electron enhanced ion boronizing device and process of the present invention belong to the category of metal material surface chemical heat treatment process technology. Specifically, it is a technology and device for ion boronizing on the surface of a conductive material by using the hollow cathode effect and thermionic emission effect. The invention provides an ion boronizing device and method using solid boride as a supply source. 2. Background technology [0003] Existing boronizing methods, such as solid boronizing, liquid boronizing, gas boronizing, paste boronizing, electrolytic boronizing, vacuum boronizing and gas ion boronizing methods, all have different shortcomings. Solid, liquid, and gas boronizing have slow speed, poor controllability of composition, and pollute the environment. Paste boronizing has poor working conditions, poor controllability, high labor intensity and long processing time. Vacuum boronizing and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/68
Inventor 秦林李咏梅范爱兰唐宾
Owner TAIYUAN UNIV OF TECH
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