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A method for preparing steel-based porous materials based on nitrogen precipitation in solid-state phase transition

A porous material and solid-state phase transition technology, applied in the field of material preparation, can solve the problems of poor solubility and difficulty in preparing steel-based materials with micro-nano pores, and achieve the effect of uniform distribution of pores

Active Publication Date: 2022-03-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims at the problem that it is difficult to prepare steel-based materials with micro-nano pores in the prior art, and provides a method for preparing steel-based porous materials based on the precipitation of nitrogen in solid-state phase transition. There is a poor solubility in the body α. During the transformation process from austenite γ to ferrite α, the supersaturated nitrogen gas is precipitated to form micro-nano pores, and the steel-based porous material is obtained.

Method used

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  • A method for preparing steel-based porous materials based on nitrogen precipitation in solid-state phase transition
  • A method for preparing steel-based porous materials based on nitrogen precipitation in solid-state phase transition
  • A method for preparing steel-based porous materials based on nitrogen precipitation in solid-state phase transition

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Embodiment 1

[0029] Embodiment 1: A method for preparing a steel-based (pure iron) porous material based on the precipitation of nitrogen in solid-state phase transition, the specific steps are as follows:

[0030] (1) Turn on the water pump to ensure that the cooling water pressure is about 0.2MPa, turn on the pneumatic switch to raise the furnace cover, and wipe the sealing rubber ring and the furnace body clockwise with cotton dipped in alcohol;

[0031] (2) Polish the surface of the rod-shaped material with a size of Φ10×300mm, clean it with absolute ethanol, pass it through the induction coil after drying and fix it in the furnace body;

[0032] (3) Close all inlet valves and outlet valves, start the vacuum pump and mechanical pump, open the high-pressure valve, evacuate until the vacuum in the furnace is about 0.05MPa, turn and lock the furnace cover, and continue to evacuate to the vacuum in the furnace not higher than 10 -3 Pa;

[0033] (4) Turn on the switch of the nitrogen cyli...

Embodiment 2

[0037] Embodiment 2: A method for preparing a steel-based (pure iron) porous material based on the precipitation of nitrogen in solid-state phase transition, the specific steps are as follows:

[0038] (1) Turn on the water pump to ensure that the cooling water pressure is about 0.2MPa, turn on the pneumatic switch to raise the furnace cover, and wipe the sealing rubber ring and the furnace body clockwise with cotton dipped in alcohol;

[0039] (2) Polish the surface of the rod-shaped material with a size of Φ10×300mm, clean it with absolute ethanol, pass it through the induction coil after drying and fix it in the furnace body;

[0040] (3) Close all inlet valves and outlet valves, start the vacuum pump and mechanical pump, open the high pressure valve, evacuate until the vacuum in the furnace is about 0.05MPa, turn and lock the furnace cover, and continue to evacuate to the vacuum in the furnace not higher than 10 -3 Pa;

[0041] (4) Turn on the switch of the nitrogen cyli...

Embodiment 3

[0045] Embodiment 3: A method for preparing a steel-based (pure iron) porous material based on the precipitation of nitrogen in solid-state phase transition, the specific steps are as follows:

[0046] (1) Turn on the power supply of the device, start the circulating water cooling system, open the isolation valve between the furnace body and the vacuum system, put pure iron into the melting crucible, close the furnace cover, and initially lock the furnace body;

[0047] (2) Start the mechanical pump, turn on the vacuum gauge, when the air pressure reaches 10 2 After Pa, further lock the furnace cover, continue to evacuate to 10Pa, open the Roots pump and high vacuum valve to evacuate to 10Pa -2 Pa;

[0048] (3) When the vacuum degree in the furnace reaches 10 -2 After Pa, turn on the heating power supply of the upper mold and the lower mold;

[0049] (4) When the temperature of the upper and lower molds reaches the experimental set temperature, turn on the melting power sup...

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Abstract

The invention relates to a method for preparing a steel-based porous material based on nitrogen precipitation in solid-state phase transition, and belongs to the technical field of material preparation. The present invention first melts steel in a high-pressure nitrogen atmosphere to obtain a steel melt; since nitrogen has a poor solubility in austenite γ and ferrite α, by controlling the cooling rate, nitrogen can be transferred from austenite γ to ferrite α Micro-nano-scale pores are precipitated during the transformation process, and a steel-based porous material is obtained. The steel-based porous material prepared by the invention has spherical pores, micronano-scale pore size, uniform distribution of pores, and adjustable pore size in the range of (100nm-10μm) by controlling the working air pressure.

Description

technical field [0001] The invention relates to a method for preparing a steel-based porous material based on nitrogen precipitation in solid-state phase transition, and belongs to the technical field of material preparation. Background technique [0002] Steel-based porous material is a widely used metal material. Compared with low-melting point porous metals such as aluminum foam and magnesium, steel-based porous material has more prominent advantages, such as: low electrical conductivity, high thermal insulation performance, high sound insulation Performance, high damping, energy absorption and shock absorption, but also higher strength, energy absorption and high temperature resistance than low melting point porous metal. Therefore, steel-based porous materials have broad application prospects in aerospace, ships, vehicles, construction and other fields. At present, the preparation of steel-based porous materials mainly includes powder metallurgy, melt foaming and solid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04
CPCC22C33/04
Inventor 金青林刘恩典李再久王彬刘沉吕建平杨志浩李中成刘明诏
Owner KUNMING UNIV OF SCI & TECH