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A method for preparing foamed zinc-based materials by powder metallurgy

A powder metallurgy and foamed zinc technology, which is applied in the field of powder metallurgy to prepare foamed zinc-based materials, can solve the problems of large pore size, high cost and complex process method of the sample, and achieves the effects of small pore size, reduced preparation cost and flexible process.

Active Publication Date: 2017-01-11
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the foaming agents used in powder metallurgy to prepare metal foam are TiH 2 , the cost is expensive and the prepared sample has a large pore size, and most of them need to be pretreated, and the process method is very complicated

Method used

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  • A method for preparing foamed zinc-based materials by powder metallurgy
  • A method for preparing foamed zinc-based materials by powder metallurgy
  • A method for preparing foamed zinc-based materials by powder metallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix zinc powder and magnesium powder with a mass ratio of 9:1 and calcium carbonate powder with a total mass of zinc powder and magnesium powder of 1.0%; weigh a certain amount of mixed powder and cold press it into a block in a cold pressing mold; The pressed sample is alloyed at 360°C for 16 hours, and then hot-pressed at 330-350°C and 300MPa for 15 minutes to make a foamable preform, and the relative density of the preform is greater than 99.99%. After the surface is cleaned, put it into a resistance furnace with a preheating temperature of 610-650 ° C and pass through a protective gas (argon) to keep it foaming for 2-3 minutes; take out the foamed sample and cool it down. The average pore diameter is 0.1-1mm, the porosity is 68.0%, and the foamed zinc-based material with uniform pore structure is obtained, such as figure 2 shown.

Embodiment 2

[0030] Mix zinc powder and magnesium powder with a mass ratio of 9:1 and calcium carbonate powder with a total mass of zinc powder and magnesium powder of 3.0%; weigh a certain amount of mixed powder and cold press it into a block in a cold pressing mold; The pressed sample is alloyed at 360°C for 16 hours, and then hot-pressed at 330-350°C and 300MPa for 15 minutes to make a foamable preform, and the relative density of the preform is greater than 99.99%. After the surface is cleaned, put it into the preheating temperature of 610 ~ 650 ℃, with protective gas (SF 6 with CO 2 Insulated and foamed in a resistance furnace for 2 to 3 minutes; take out the foamed sample and cool it to obtain a zinc-based foam with an average pore diameter of 0.1 to 1 mm, a porosity of 55.3%, and a uniform pore structure. materials such as image 3 shown.

Embodiment 3

[0032] Mix zinc powder and magnesium powder with a mass ratio of 7:3 and calcium carbonate powder with a total mass of zinc powder and magnesium powder of 5.0%; weigh a certain amount of mixed powder and cold press it into a block in a cold pressing mold; The pressed sample is alloyed at 400°C for 12 hours, and then hot-pressed at 330-345°C and 300MPa for 10 minutes to make a foamable preform, and the relative density of the preform is greater than 99.99%. After the surface is cleaned, put it into a resistance furnace with a preheating temperature of 610-650°C and keep it foamed for 2-4 minutes; after taking out the foamed sample, cool it down to obtain an average pore size of 0.1-3mm. The ratio is 62.2%, and the foamed zinc-based material with uniform pore structure, such as Figure 4 shown.

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Abstract

The invention discloses a method for preparing a foam zinc-based material through a powder metallurgic method and belongs to the field of foam metal materials. According to the method, a foaming agent is calcium carbonate, a metallic matrix is zinc powder and magnesium powder, and foaming gas is carbon monoxide generated by liquid-solid reaction between magnesium melt and calcium carbonate. The method comprises the following specific steps: after the zinc powder, magnesium powder and calcium carbonate powder are uniformly mixed, carrying out cold-pressing so as to form a precast block, carrying out heat treatment, alloying, carrying out hot-pressing for 5-60 min so as to prepare into a foamable preform, after the surface of the preform is cleaned, putting the preform into a resistance furnace for heating foaming, and finally, cooling a sample, so as to obtain the foam zinc-based material with a relatively uniform pore structure. The method provided by the invention is simple to operate, basic components are adjustable, the finished product adopts a sandwich structure, namely multiple holes are formed in the finished product, and the external part of the finished product is compact, and the foam zinc-based material has a wide application prospect.

Description

technical field [0001] The invention relates to a method for preparing foamed zinc-based materials by powder metallurgy, and belongs to the field of preparation of foamed metal materials. Background technique [0002] Porous metal material is a new type of functional material and structural material with excellent performance, which has unique structure and performance. Its excellent physical, mechanical, thermal, electrical and acoustic properties realize the lightweight and multi-functional structural materials, and have broad application prospects in industrial and national defense technology fields such as automobiles, aviation, highway construction, and architectural decoration. At present, foamed aluminum is the most researched on metal foam, followed by foamed magnesium, and there is little research on foamed zinc. Studies have shown that foamed zinc alloy has good mechanical properties and high damping capacity. Therefore, foamed zinc can be As a shock-absorbing and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C18/00
Inventor 杨东辉陈伟萍胡中芸陈建清江静华马爱斌
Owner HOHAI UNIV