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Preparation method of through-hole foamed steel

A foam steel and precursor technology, applied in the field of foam metal materials, can solve the problems of difficult gypsum removal in the manufacture of porous gypsum molds, the inability to obtain large-sized through-hole foam steel, and the inability to achieve large-scale production, etc., to achieve material reliability The effect of recycling, uniform and controllable structure, and high porosity

Inactive Publication Date: 2008-06-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder metallurgy method uses steel powder and a pore-forming agent to mix, press to densify, and remove the pore-forming agent after sintering (or at the same time) to obtain foam steel. This method is limited by the powder metallurgy process itself and cannot obtain large-sized through-hole foam. Steel can not be produced on a large scale; the hollow steel ball sintering method has the disadvantages of difficult preparation of hollow balls and low production efficiency; the method of sintering after depositing (or coating) metal on the foamed plastic substrate has the burning and removal of plastics, which is easy to cause damage to the environment The problem of pollution; porous gypsum mold seepage method has problems such as difficulty in making porous gypsum molds and removal of gypsum after seepage

Method used

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  • Preparation method of through-hole foamed steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Copper balls (big ball diameter 5mm, small ball diameter 0.3mm, volume ratio of large and small balls 11:1) are mixed evenly in the mixer (rotational speed: 120rpm, mixing time: 20min.;), put into reducing atmosphere H 2 Sintering in silicon carbon rod sintering furnace (sintering temperature: 950°C, sintering time 25min.) to obtain copper infiltration precursor, preheat the sintered copper infiltration precursor (preheating temperature: 880°C, preheating time 10min.) spare. At the same time, Q235 steel is heated to 1780°C in a graphite crucible with an induction furnace to melt and hold for 30 minutes. It penetrates into the copper precursor through pressure seepage (seepage pressure: 6MPa, seepage temperature: 1770°C, seepage velocity: 3mm / s) , the complex water after percolation can obtain the complex body of Q235 steel and copper precursor, and the complex body is heated and melted in the induction furnace to remove copper (heating temperature: 1350 ° C, melting tim...

Embodiment 2

[0014] Copper balls (big ball diameter 1mm, small ball diameter 0.2mm, volume ratio of big and small balls 4:1) are mixed evenly in the mixer (rotational speed: 100rpm, mixing time: 30min.;), put into reducing atmosphere H 2 Sintering in silicon carbon rod sintering furnace (sintering temperature: 900°C, sintering time 50min.) to obtain copper infiltration precursor, preheat the sintered copper infiltration precursor (preheating temperature: 850°C, preheating time 20min.) spare. At the same time, 45 steel is heated to 1700°C in a graphite crucible, melted and kept for 40min., and penetrates into the copper precursor through pressure seepage (seepage pressure: 10MPa, seepage temperature: 1680°C, seepage velocity: 4mm / s.) In the composite body after infiltration, the composite body of 45 steel and copper precursor was obtained, and the composite body was heated to remove copper (heating temperature: 1300°C, melting time 30min.), and the porosity was obtained after air cooling. ...

Embodiment 3

[0016] Copper balls (big ball diameter 4mm, small ball diameter 0.5mm, volume ratio of big and small balls 3:1) were evenly mixed in the mixer (rotational speed: 80rpm, mixing time: 50min.;), put into reducing atmosphere H 2 Sintering in silicon carbon rod sintering furnace (sintering temperature: 850°C, sintering time 60min.) to obtain copper infiltration precursor, preheat the sintered copper infiltration precursor (preheating temperature: 820°C, preheating time 30min.) spare. At the same time, eutectoid steel (containing 0.77wt.% C) is heated and melted in a graphite crucible with an induction furnace (heating temperature 1650°C, holding time 30min.), and seeps through pressure (seepage pressure: 15MPa, seepage body temperature: 1640°C , percolation velocity: 5mm / s) infiltrated into the copper precursor, and the composite after percolation was water-cooled to obtain a composite of eutectoid steel and copper precursor, and the composite was heated to remove copper (heating t...

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Abstract

The invention discloses a preparation method for porous foamed steel and belongs to the porous foam metal field. The invention adopts copper metal balls with different diameters of which melting point is lower than that of the steel to be sintered into a precursor, takes the steel as a filtration body to permeate into the precursor through the method of pressure seepage flow, a composite body being obtained after cooling; then the composite body is heated to make the metal copper of the precursor to be melted away from the composite body, and the porous foamed steel is obtained. The invention has the characteristics of simple process, low cost, recycled materials and no pollution to the environment, and can realize the industrialization production.

Description

technical field [0001] The invention belongs to the field of foamed metal materials, in particular to a process for preparing through-hole foamed steel. Background technique [0002] Through-hole foam steel has the characteristics of high specific surface area, high specific strength, sound absorption, heat preservation, heat insulation, penetration, filtration, energy absorption, etc. The field has huge market potential. [0003] At present, the known preparation methods of through-hole foam steel are mainly powder metallurgy method, hollow steel ball sintering method, method of depositing (or coating) metal on foam plastic substrate and sintering method and porous gypsum mold infiltration method. The powder metallurgy method uses steel powder and a pore-forming agent to mix, press to densify, and remove the pore-forming agent after sintering (or at the same time) to obtain foam steel. This method is limited by the powder metallurgy process itself and cannot obtain large-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08B22D23/04
Inventor 左孝青陆建生周芸
Owner KUNMING UNIV OF SCI & TECH
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