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Method for preparing porous foam steel by melt foaming process and apparatus thereof

A technology of porous foam and melt foaming, which is applied to the device for realizing the method and the field of preparing porous foam steel, which can solve the problems of poor foaming effect, short retention time, and fast cooling speed, so as to improve the pore structure and The distribution of pores, the increase of residence time, and the effect of preventing the foaming agent from floating

Inactive Publication Date: 2010-09-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the method of preparing foamed steel mainly adopts powder metallurgy sintering method. For the preparation of porous foamed steel by melt foaming, there are mainly the following difficulties: (1) The temperature of molten steel is high, and the cooling speed is fast during casting and foaming. The fixed residence time in the foaming temperature range is short; (2) When the molten steel is cast, the buoyancy is relatively large, the density of the foaming agent is lower than that of the molten steel, and a large amount of foaming agent floats to the surface of the molten steel, resulting in poor foaming effect; (3) The foaming agent is in direct contact with the molten steel during casting, and when the foaming agent heats up rapidly and reaches the decomposition temperature, it decomposes rapidly, resulting in low viscosity of the molten steel and a large amount of gas escaping; (4) The generated bubbles are unstable, due to The viscosity of molten steel is low, and the generated air bubbles receive little resistance during the rising process, resulting in large air bubbles and uneven distribution of air bubbles in the product

Method used

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  • Method for preparing porous foam steel by melt foaming process and apparatus thereof
  • Method for preparing porous foam steel by melt foaming process and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A, the blowing agent Cr 2 N is spread on the bottom of the crucible of the heating furnace according to the amount of 0.1% of the mass of molten steel, covered with a steel net on the foaming agent, and spread water glass sand on the steel net to harden it. The quality score is 3%;

[0027] B. Place the crucible containing the foaming agent in the heating furnace, raise the temperature to 1005°C for heat preservation, control the temperature rise rate at 5°C / min, keep heat for pouring;

[0028] C. Cast 45 molten steel with a melting temperature of 1450°C into the crucible in the heating furnace, adjust the temperature of the molten steel in the crucible to 1350°C for heat preservation, stir the molten steel at a speed of 200r / min, and heat and stir for 1min;

[0029] D. Take out the crucible and cool it to room temperature in air to make porous foam steel material.

Embodiment 2

[0031] A, the blowing agent Mn 4 N is spread flat on the bottom of the crucible of the heating furnace according to the addition of 0.6% of the molten steel mass, covered with a steel mesh on the foaming agent, and spread water glass sand on the steel mesh to harden it. The quality score is 5%;

[0032] B. Place the crucible containing the foaming agent in the heating furnace, raise the temperature to 1064°C for heat preservation, and control the temperature rise rate at 10°C / min, keep heat for pouring;

[0033] C. Cast molten 40Cr alloy steel molten steel with a pouring temperature of 1550°C into the crucible in the heating furnace, adjust the temperature of the molten steel in the crucible to 1510°C for heat preservation, stir the molten steel at a speed of 800r / min, and heat and stir for 2 minutes;

[0034] D. Take out the crucible and cool it to room temperature in air to make porous foam steel material.

[0035] Implementation results

[0036] The holes in the samples ...

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Abstract

The invention provides a method and a device for preparing porous blister steels through foaming of fused masses. The method comprises the following steps: firstly, a foaming agent is flatly laid at the bottom of a crucible and covered with a stainless steel mesh, so as to prevent the foaming agent from floating upward; secondly, the crucible is placed into a heating furnace for heating until thetemperature is 50 to 100 DEG C lower than the temperature that the foaming agent begins to discompose, and molten steels are poured into the crucible; thirdly, a heat-insulated heating device is utilized to adjust the temperature of the molten steels in the crucible until the temperature is 250 to 350 DEG C above the temperature that the foaming agent begins to discompose; and fourthly, after heat preserved stirring for 1 to 2 minutes, the crucible is taken out and air-cooled to the room temperature, and the porous blister steel materials are obtained. The method and the device can increase the residence time of the molten steels within a temperature region for decomposing the foaming agent, prevent the foaming agent from floating upward, and improve the structural characteristics and thedistribution characteristics of holes of prepared samples, has simple technique, is easy to operate, and is an ideal method for preparing the porous blister steels.

Description

technical field [0001] The invention relates to a process for preparing porous foamed steel, in particular to a method for preparing porous foamed steel by a melt foaming method and a device for realizing the method, belonging to the technical field of porous material preparation. Background technique [0002] Metal foam is a new type of material developed in the 1940s. At present, the research on metal foam mainly focuses on the research on metals with low melting point, and the research on porous steel foam with high melting point is still in its infancy. [0003] The development of modern industry has higher and higher requirements on the structure and performance of materials. For some special materials, not only light weight is required, but also high strength requirements are required, such as materials used in the aerospace field and so on. Compared with foamed aluminum and other low-melting point metal foams, which are the most widely studied at present, foamed steel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08
Inventor 蒋业华李祖来黎振华周荣张冬平
Owner KUNMING UNIV OF SCI & TECH
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