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Molybdenum foam with high porosity and controllable three-dimensional through-holes and its preparation method

A high-porosity, foam technology, applied in the field of porous metal materials, can solve the problems of affecting material properties, foaming agent segregation, affecting the uniformity and connectivity of pores, etc., and achieves simple preparation method, high porosity, good isotropic effect

Active Publication Date: 2016-10-05
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A key process of the foaming method is the mixing process of foaming agent and metal powder. The current general mixing method is to use a mixer for mixing, but when the particle size difference between the foaming agent and the metal powder is large, the mixing Foaming agent segregation will inevitably occur in the material process, which will seriously affect the uniformity and connectivity of pores, and then affect the material properties.

Method used

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  • Molybdenum foam with high porosity and controllable three-dimensional through-holes and its preparation method
  • Molybdenum foam with high porosity and controllable three-dimensional through-holes and its preparation method
  • Molybdenum foam with high porosity and controllable three-dimensional through-holes and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of molybdenum with a porosity of 75%

[0033] Step 1) Weighing. According to the required porosity and each layer of molybdenum powder and urea mass relationship formula, the required mass of each layer of molybdenum powder is 0.392g, and the required mass of urea is 0.154g. Divide 74μm molybdenum powder into 0.392g each, and urea into 0.154g each.

[0034] Step 2) charging. Put 1 part of molybdenum powder weighed in step 1 into the mold, flatten the molybdenum powder with a pressure rod, put it into the wire mesh, then introduce 1 part of urea into the mold, then put the wire mesh into the mold, pour the weighed urea, pull out the metal mesh and lightly press the urea with a pressure rod, so that the urea particles are rearranged and evenly embedded between the molybdenum powders (see figure 1 ). Repeat the above charging process 5 times.

[0035] Step 3) Compression. The mold that has been charged in step 2 is pressed into a billet at 300 MPa on a hy...

Embodiment 2

[0039] Preparation: Preparation of molybdenum with a porosity of 70%

[0040] According to the required porosity and each layer of molybdenum powder and urea mass relationship formula, the required mass of each layer of molybdenum powder is 0.471g, and the required mass of urea is 0.143g. Divide 74μm molybdenum powder into 0.471g each, and urea into 0.143g each. All the other steps are the same as in Example 1.

Embodiment 3

[0042] Preparation: Preparation of molybdenum with a porosity of 65%

[0043] According to the required porosity and each layer of molybdenum powder and urea mass relationship formula, the required mass of each layer of molybdenum powder is 0.55g, and the required mass of urea is 0.133g. Divide 74μm molybdenum powder into 0.55g each, and urea into 0.133g each. All the other steps are the same as in Example 1.

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Abstract

The invention discloses a high-pore controllable three-dimensional through hole foam molybdenum and a preparation method thereof. The molybdenum pore is in the shape of a three-dimensional sphere, and the pore is formed by mutually communicating generating holes with interstitial holes. The pore rate of the molybdenum structure is higher and is controllable, the pore is in the shape of a regular sphere, and the pore has isotropic mechanical characteristic. The preparation method is based on a traditional powder metallurgy method, a foaming method is combined, a novel layer spread method for material loading is adopted, and then, the foam molybdenum is obtained through pressing, dissolving and sintering. The preparation method provided by the invention is simple, the cost is low, the production cycle is short, pores are distributed uniformly, and the foam molybdenum has favorable mechanical and energy absorption properties.

Description

technical field [0001] The invention relates to a porous metal material, in particular to a high-porosity controllable three-dimensional through-hole foamed molybdenum with high porosity and uniform connected three-dimensional pore structure and a preparation method thereof. Background technique [0002] Porous metal materials combine the characteristics of metals such as electrical conductivity, thermal conductivity, weldability and plasticity, and the unique functional properties of porous structures such as high permeability, energy absorption, capillarity, fire resistance and heat insulation. They are widely used in industry for filtration and separation, In high-speed fields such as shock absorption, fire protection, penetration devices and aerospace. According to comprehensive literature reports, most of the research on porous metal materials focuses on light metals and low melting point materials, which greatly restricts the application of porous materials in extreme ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C27/04
Inventor 刘龙飞曹富华颜建辉郭世柏
Owner HUNAN UNIV OF SCI & TECH
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