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Vacuum foaming preparation method of blister steel

A technology of vacuum foaming and steel foam, which is applied in the field of metal foam materials, and can solve the problems of limited product size, high cost, and difficult control of pore structure.

Inactive Publication Date: 2013-08-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the high cost and limited size of the product in the preparation of foamed steel by the existing powder metallurgy method, and the low porosity and difficult control of the pore structure of the foamed steel prepared by the melt foaming method Not enough , providing a vacuum foaming preparation method for foamed steel

Method used

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  • Vacuum foaming preparation method of blister steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Heat carbon steel with a carbon content of 0.45% and a melting point of 1530-1480°C to 1560°C and keep it warm for 2 hours;

[0064] (2) First heat SiC to 1500°C and keep it warm for 3 hours, then add 15% of the steel volume SiC (particle size is 10 μm) to the molten steel after step (1) heat preservation, and then stir at a stirring speed of 2500r / min Viscosification 8min;

[0065] (3) Add Gr by 0.1% of the steel mass to the steel melt after step (2) viscosity increasing 2 N (particle size is 20μm), and then stirred at a stirring rate of 1500r / min for 5min to produce uniformly distributed, large number of initial pores with a pore size of 0.08-0.18mm in the steel melt;

[0066] (4) Cover and seal the melt obtained in step (3) and vacuumize it, and perform vacuum foaming at a vacuum degree of 5Pa for 10s;

[0067] (5) Cooling and solidifying the foamed steel melt after vacuum foaming in step (4) under vacuum conditions to finally obtain foamed steel with a porosit...

Embodiment 2

[0069] (1) Heat carbon steel with a carbon content of 0.20% and a melting point of 1530-1480°C to 1580°C and keep it warm for 2 hours;

[0070] (2) First heat SiC to 1500°C and keep it warm for 3 hours, then add SiC with 13% steel volume (particle size is 10 μm) to the molten steel after step (1) and keep it warm, and then stir at a stirring speed of 2000r / min Viscosification for 10 minutes;

[0071] (3) Add Gr by 0.15% of the steel mass to the steel melt after step (2) viscosity increasing 2 N (particle size is 20μm), and then stirred at a stirring rate of 2000r / min for 6min to produce uniformly distributed, large number of initial pores with a pore size of 0.05-0.13mm in the steel melt;

[0072] (4) Cover and seal the melt obtained in step (3) and vacuumize it, and perform vacuum foaming at a vacuum degree of 1Pa for 25s;

[0073] (5) Cooling and solidifying the foamed steel melt after vacuum foaming in step (4) under vacuum conditions to finally obtain foamed steel with a...

Embodiment 3

[0075] (1) Heat eutectoid carbon steel with a carbon content of 0.77% and a melting point of 1530-1480°C to 1530°C and keep it warm for 2 hours;

[0076] (2) First heat SiC to 1500°C and keep it warm for 3 hours, then add 10% of the steel volume SiC (particle size is 10μm) to the molten steel after step (1) and keep it warm, and then stir at a stirring speed of 1500r / min Viscosification for 15 minutes;

[0077] (3) Add Gr by 0.05% of the steel mass to the steel melt after step (2) viscosity increasing 2 N (particle size is 20μm), and then stirred at a stirring rate of 2500r / min for 8min to produce uniformly distributed, large number of initial pores with a pore size of 0.03-0.11mm in the steel melt;

[0078] (4) Cover and seal the melt obtained in step (3) and vacuumize it, and perform vacuum foaming at a vacuum degree of 10 Pa for 5 seconds;

[0079] (5) cooling and solidifying the foamed steel melt after vacuum foaming in step (4) under vacuum conditions to finally obtain ...

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Abstract

The invention provides a vacuum foaming preparation method of blister steel and belongs to the technical field of a foam metal material. The vacuum foaming preparation method comprises the following steps of: carrying out steel smelting, tackifying a steel melt, generating initial air pores in the steel melt, foaming in vacuum, and cooling a blister steel melt to finally obtain the blister steel with the porosity of 70-85% and the pore diameter of 0.5-5mm. According to the vacuum foaming preparation method disclosed by the invention, SiC is used as a tackifier to carry out tackifying treatment on the steel melt; and a small amount of Cr2N is added into the steel melt tackified by the SiC, and gas is generated by agitating and dispersing the Gr2N and decomposing the Gr2N, so that the initial air pores which are uniformly distributed, great in quantity and fine are generated in the steel melt, and the blister steel is prepared by foaming in the vacuum. The control of the distribution, the quantity, the size, the vacuum degree, the foaming time and the like of the generated initial air pores is carried out so as to control the porosity and the pore structure of the blister steel to prepare the blister steel with the excellent performance in short time. The vacuum foaming preparation method of the blister steel, disclosed by the invention, has the characteristics of high efficiency, simple process, controllable pore structure, stable process and the like, and can realize the industrial production.

Description

technical field [0001] The invention relates to a vacuum foaming preparation method of foamed steel, which belongs to the technical field of foamed metal materials. Background technique [0002] The unique pore structure of foam steel makes it have the characteristics of both structural materials and functional materials. As a structural material, it has the characteristics of light weight and high specific strength; as a functional material, it has various properties such as sound absorption, sound insulation, heat insulation, heat dissipation, flame retardancy, shock absorption, shock absorption, and electromagnetic shielding. Therefore, Foam steel has broad application prospects in aerospace, aviation, transportation, electronics, military industry, chemical industry, environmental protection, energy, machinery and other fields. [0003] At present, the preparation of foam steel mainly adopts powder metallurgy method and melt foaming method. Although the powder metallur...

Claims

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Application Information

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IPC IPC(8): C22C33/00C22C38/00C22C1/08
Inventor 左孝青王俊陆建生周芸刘荣佩
Owner KUNMING UNIV OF SCI & TECH
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