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Technological process for surface low temperature boriding of low carbon steel

A process method, low carbon steel technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of high brittleness, high energy consumption, easy peeling of borides, and reduce the boronizing temperature. , Improve the boronizing efficiency and overcome the effect of large deformation

Inactive Publication Date: 2005-11-23
SHANGHAI UNIV
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

However, there are still some shortcomings in the boronizing process, such as the boride itself is brittle and easy to peel off, the traditional boronizing process requires high temperature, high energy consumption, and large deformation of the workpiece after boronizing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The low-temperature boronizing process steps of the present embodiment are as follows:

[0018] 1. Before boronizing, the surface of the low-carbon steel sample is nano-treated with a surface grinder.

[0019] In this embodiment, the existing SNC-1 metal surface nanometerization testing machine is adopted. This machine is equipped with a cooling water circulation device. A container is arranged in the machine, and a piece of low-carbon metal surface prepared for nanometerization treatment is fixed on the container cover. steel sample; small steel balls for nano shot blasting are housed in the container, and the diameter of the small steel balls is 8mm, 200 in total; the container cover is closed and sealed, and vacuumized; then the motor is started to drive the testing machine to rotate at a high speed, and A vibration generator is used to make the nano-sized shot-peening small steel balls move vigorously to perform nano-processing on the metal surface itself, and the p...

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PUM

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Abstract

The present invention relates to a low temperature boriding process on mild steel surface, belonging to the field of surface heat treatment processing technology. The characteristic of the present invention is nanometerizing steel surface and then low temperature plasma boriding. The process includes the following procedures: 1) mechanical grinding of the surface of mild steel for nanometerization treatment before boriding, 2) charging the mild steel sample after nanometerization treatment in a plasma heat treatment furnace, vacuum pumping up to 40 Pa, starting heating by ion glow between electrodes, adding boriding reagent B(OCH3)3 and blowing the mixed gas of Ar and H2. Operation voltage is 800- 1200 V, the pressure of mixed gas is 400 -1000 Pa, plasma boriding temperature is kept at 500- 650 degree C for 4-8 hours. Then the furnace is cooled down to room temperature, resulting in obtaining surface boriding mild steel. The boriding layer mainly contains Fe2B of crystalline phase with hardness of HV 1700 - 2100.

Description

technical field [0001] The invention relates to a low-temperature boronizing process on the surface of low-carbon steel, which belongs to the technical field of metal surface heat treatment. Background technique [0002] Metal surface treatment engineering refers to the process of changing the shape, chemical composition, structure and stress state of the metal material surface after the metal is treated by surface coating, surface modification or multiple technologies to obtain the required surface properties. . [0003] The application of nanomaterials and nanotechnology to surface engineering has brought the development of surface engineering into a new stage. In 2000, some scholars put forward the concept of "nano surface engineering". It is pointed out that "nano surface engineering" is to make full use of nanomaterials and nanotechnology to enhance and improve traditional surface engineering, and to change the shape, composition, structure, etc. of the surface of sol...

Claims

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Application Information

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IPC IPC(8): C23C8/08
Inventor 吴晓春徐凌云汪宏斌
Owner SHANGHAI UNIV
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