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 porosi

Method used

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  • Vacuum foaming preparation method of blister steel
  • Vacuum foaming preparation method of blister steel

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0062] Example 1

[0063] (1) The carbon steel with a carbon content of 0.45% and a melting point of 1530-1480°C is heated to 1560°C and kept for 2 hours;

[0064] (2) First heat the SiC to 1500℃ and keep it for 3h, and then add 15% of the steel volume of SiC (grain size 10μm) to the molten steel after step (1), and then stir at a stirring speed of 2500r / min 8min thickening;

[0065] (3) Add Gr according to 0.1% of the steel mass to the steel melt after step (2) viscosity increase 2 N (particle size is 20μm), then stir for 5min at a stirring rate of 1500r / min, so that the steel melt will have evenly distributed and numerous initial pores with a diameter of 0.08~0.18mm;

[0066] (4) The melt obtained in step (3) is sealed and evacuated, and vacuum foaming is carried out at a vacuum of 5 Pa for 10 seconds;

[0067] (5) The foam steel melt after vacuum foaming in step (4) is cooled and solidified under vacuum conditions, and finally foam steel with a porosity of 85% and a pore size of 2.5...

Example Embodiment

[0068] Example 2

[0069] (1) The carbon steel with a carbon content of 0.20% and a melting point of 1530-1480°C is heated to 1580°C and kept for 2 hours;

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

[0071] (3) Add Gr according to 0.15% of the steel mass to the steel melt after step (2) viscosity increase 2 N (particle size is 20μm), and then stir for 6min at a stirring rate of 2000r / min, so that the steel melt will have evenly distributed, numerous initial pores with a diameter of 0.05~0.13mm;

[0072] (4) Cover the melt obtained in step (3) and evacuate, and perform vacuum foaming at a vacuum of 1 Pa for 25 seconds;

[0073] (5) The foam steel melt after vacuum foaming in step (4) is cooled and solidified under vacuum conditions, and finally a foam steel with a porosity of 75% and a pore size of 0...

Example Embodiment

[0074] Example 3

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

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

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

[0078] (4) The melt obtained in step (3) is sealed and evacuated, and vacuum foaming is performed at a vacuum of 10 Pa for 5 seconds;

[0079] (5) Cool and solidify the foam steel melt after vacuum foaming in step (4) under vacuum conditions, and finally obtain eutectoid foam steel with a porosity of 70% an...

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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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