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Fast and efficient aluminum-silicon-nitrogen composite permeating technology for steel

A composite infiltration and high-efficiency technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of reducing the mechanical properties of the material matrix, unfavorably obtaining the elements to be infiltrated, and the quality of the infiltrating layer is not ideal. Reasonable distribution of hardness curve, high hardness and better mechanical properties

Inactive Publication Date: 2016-04-27
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the external factors affecting the formation of active atoms or active groups containing elements to be infiltrated in the infiltration box are mainly the treatment heating temperature, and the diffusion of active atoms and groups to the surface of the infiltrated parts can only be achieved by thermal diffusion. If the temperature is not high, it is not conducive to the rapid acquisition of elements to be infiltrated on the surface of the infiltrated part.
However, high heating temperature not only consumes high energy, but also reduces the mechanical properties of the material matrix.
Therefore, the traditional powder method of aluminum-silicon-nitriding compound not only has a high heating temperature in the aluminum-silicon co-infiltration section, but also has high energy consumption, low infiltration expansion efficiency, and unsatisfactory quality of the infiltration layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The material to be infiltrated is: 45 steel; the composition of aluminum-silicon co-infiltration agent: aluminum donor (aluminum powder, content 2%), activator (ammonium chloride, content 1%), loosening agent (charcoal, content 1%) %), filler, silicon-donating agent (green silicon carbide, content is 96%); Nitriding agent composition: nitrogen-donating agent (industrial urea, content is 40%), filler and nitrogen-donating agent (nitrogen-enriched charcoal, content is 60%).

[0013] First carry out the aluminum-silicon co-infiltration stage treatment: the sample is placed between two parallel plate-shaped electrodes in the infiltration box, and the two electrodes are respectively connected by wires to a 50Hz AC power supply whose voltage is continuously adjustable in the range of 0-250 volts , the electrode and the sample are sealed in the infiltration box together with the aluminum-silicon co-infiltration agent, placed in a heat treatment furnace from room temperature to...

Embodiment 2

[0017] The material to be infiltrated is: 45 steel; the composition of aluminum-silicon co-infiltration agent: aluminum donor (aluminum powder, content 2%), activator (ammonium chloride, content 1%), loosening agent (charcoal, content 1%) %), filler, silicon donor (green silicon carbide, content 96%); nitriding agent composition: nitrogen donor (industrial urea, content 40%), activator (ammonium chloride, content 2%) , filler and nitrogen supply agent (nitrogen-enriched charcoal, the content is 58%).

[0018] The compound infiltration method and device are the same as in Example 1. The temperature of the aluminum-silicon co-infiltration section is 800°C, the holding time is 4 hours, and the electric field current is 2A; the temperature of the nitriding section is 550°C, the electric field current is 0.5A, and the holding time is 2 hours.

[0019] Treatment results: A 200μm aluminum-silicon-nitride compound infiltrated layer was obtained on the surface of the sample, and the h...

Embodiment 3

[0021] The material to be infiltrated is: 45 steel; the composition of aluminum-silicon co-infiltration agent: aluminum donor (aluminum powder, content 2%), activator (ammonium chloride, content 1%), loosening agent (charcoal, content 1%) %), filler, silicon donor (green silicon carbide, content 96%); nitriding agent composition: nitrogen donor (industrial urea, content 40%), activator (ammonium chloride, content 1%) , filler and nitrogen supply agent (nitrogen-enriched charcoal, the content is 59%).

[0022] The compound infiltration method and device are the same as in Example 1. The temperature of aluminum-silicon co-infiltration section is 800°C, the holding time is 4 hours, and the electric field current is 2A; the nitriding section: 550°C, holding time for 2 hours + 600°C, holding time for 2 hours, and the electric field current is 0.5A.

[0023] Treatment results: A 200μm aluminum-silicon-nitride compound infiltrated layer was obtained on the surface of the sample, and...

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PUM

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Abstract

The invention provides a technology for rapidly, efficiently and compositely permeating aluminum-silicon-nitrogen into the steel surface so as to improve the high temperature oxidation resistance and the abrasive resistance of steel. Firstly, a piece needing to be treated is subject to alternating electric field strengthening powder method aluminum-silicon co-permeating at the temperature ranging from 700 DEG C to 850 DEG C, and an aluminum-silicon co-permeating layer with the surface layer without an aluminum-rich phase is obtained; and the part obtained after alternating electric field alumetizing is subject to alternating electric field strengthening powder method nitriding within the temperature scope ranging from 550 DEG C to 600 DEG C, nitride like AlN is formed in the aluminum-silicon co-permeating layer obtained in the former stage, and an aluminum-silicon-nitrogen composite permeating layer is obtained. Compared with traditional aluminum-silicon-nitrogen composite permeating, by means of the aluminum-silicon-nitrogen composite permeating technology, the permeating and expanding temperature of an aluminum-silicon co-permeating section falls to 50 DEG C to 200 DEG C, the aluminum-silicon-nitrogen composite permeating speed can be increased by one to three times, the performance of the composite permeating layer is improved, the permeating and expanding processing energy consumption is reduced, and meanwhile, the using rate of permeating agents in all fragments is obviously increased.

Description

technical field [0001] The invention belongs to the technology of modifying the surface of metal parts, and particularly refers to an energy-saving and efficient method for preparing an aluminum-silicon-nitrogen composite coating for improving the wear resistance, high temperature oxidation resistance and corrosion resistance of the surface of iron and steel parts. technical background [0002] The powder method aluminum-silicon-nitrogen compound infiltration penetrates the three elements of aluminum, silicon and nitrogen into the surface layer of steel material parts to form an aluminum-silicon-nitrogen compound with high hardness, wear resistance, high temperature oxidation resistance and corrosion resistance. Infiltrated layer, which can improve the service life of many steel parts used in friction, wear and high temperature oxidation environment. [0003] Aluminum-silicon-nitriding compound generally consists of two processes of aluminum-silicon co-infiltration and nitri...

Claims

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Application Information

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IPC IPC(8): C23C12/00
CPCC23C12/00
Inventor 谢飞张格
Owner CHANGZHOU UNIV