Preparation method of steel-based lotus-root-shaped porous material based on induction suspension zone melting

A technology of porous material and steel-based lotus root is applied in the field of obtaining regular porous structure, which can solve the problems of coarsening, uneven and uneven distribution of pores, and achieve the effect of easy operation and cost saving.

Inactive Publication Date: 2021-06-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims at the problems of poor regularity and uneven distribution of porosity in the preparation of steel porous materials by die-casting method, and uses the difference in solubility of hydrogen (or nitrogen) in steel-based materials to induce the suspension area under high-pressure hydrogen (or nitrogen, etc.) Melting, so that supersaturated hydrogen (or nitrogen, etc.) precipitates from the liquid metal to form bubbles and grows along the solidification direction to form pores, and finally obtains a regular porous structure in the steel-based material
Since the solidification speed in the zone melting process is roughly equal to the drawing speed, as long as the drawing speed is kept constant, the problem of coarsening and uneven pores in the die casting method can be solved

Method used

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  • Preparation method of steel-based lotus-root-shaped porous material based on induction suspension zone melting
  • Preparation method of steel-based lotus-root-shaped porous material based on induction suspension zone melting

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Clamp the cylindrical pure iron test bar with a size of Φ8×300mm on the sample holder 6 of the melting furnace in the vacuum induction area, and move the test bar up to the place where the bottom end of the test bar is 30mm away from the water-cooled copper tube ring, lock Tighten the upper furnace cover 1 of the melting furnace in the vacuum induction area, turn on the vacuum pump to evacuate from the exhaust channel 14, so that the pressure in the furnace is 5 Pa;

[0022] (2) Turn on the cooling device to feed the circulating cold ring water, turn on the heating power supply of the high-frequency induction coil to heat the high-frequency induction coil, start the traction device to drive the pure iron test rod to move vertically downward, and control the traction speed to 30mm / min, so that The pure iron test rod passes through the high-frequency induction coil and the water-cooled copper tube coil below the high-frequency induction coil in turn from bottom to top....

Embodiment 2

[0025] (1) Clamp the cylindrical 304 stainless steel test rod with a size of Φ8×300mm on the sample holder 6 of the melting furnace in the vacuum induction area, and move the test rod up to the place where the bottom end of the test rod is 28mm away from the water-cooled copper tube ring, lock Tighten the upper furnace cover 1 of the melting furnace in the vacuum induction area, turn on the vacuum pump to evacuate from the exhaust channel 14, so that the pressure in the furnace is 5 Pa;

[0026] (2) Turn on the cooling device to feed circulating cold ring water, turn on the heating power supply of the high-frequency induction coil to heat the high-frequency induction coil, start the traction device to drive the stainless steel test rod to move vertically downward, and control the traction speed to 30mm / min, so that the stainless steel The test rod passes through the high-frequency induction coil and the water-cooled copper tube coil below the high-frequency induction coil in tu...

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Abstract

The invention discloses a preparation method of a steel-based lotus-root-shaped porous material based on induction suspension zone melting. The preparation method comprises the following steps: carrying out induction suspension zone melting in a hydrogen or nitrogen atmosphere to obtain a steel-based regular porous material with pores which are directionally arranged along a solidification direction; and carrying out induction suspension zone melting by utilizing the solubility difference of hydrogen or nitrogen in liquid and solid metals to obtain the steel-based porous material with a regular pore structure. The method is suitable for preparing high-melting-point porous metals, and does not introduce impurities in the preparation process; and the method is simple and easy to operate, and is low in cost, and the prepared regular porous steel-based material can be applied to macromolecular filters, catalyst carriers, light materials and the like.

Description

technical field [0001] The invention relates to a method for obtaining a regular porous structure in a steel base material, belonging to the field of metal material preparation. Background technique [0002] Porous metal materials have broad application space in lightweight materials, sound-absorbing materials, macromolecular filters, catalyst supports, heat sinks, etc., and have attracted extensive attention. The melt method is an important method for preparing porous metal materials, including blown foam method, infiltration casting method, investment casting method and so on. However, most of these preparation methods are only suitable for low-melting non-ferrous metals. For high-melting metals, such as steel-based materials, regular and uniform pores cannot be obtained due to the lack of suitable foaming agents or difficult control of the process. structure. [0003] Directional solidification of metal / gas eutectic is a new technique developed in recent years to prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04
CPCC22C33/04
Inventor 金青林刘沉
Owner KUNMING UNIV OF SCI & TECH
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