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Method for preparing high-porosity molybdenum-silicon-boron porous material by adding pore-forming agent

A technology of porous material and high porosity, applied in the field of preparation of refractory metal porous materials, can solve the problems of high brittleness, poor ductility, poor thermal shock resistance, etc., and achieve excellent corrosion resistance, good economy and simple process flow. Effect

Inactive Publication Date: 2014-07-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Porous ceramic materials have excellent corrosion resistance, high temperature oxidation resistance, heat resistance and wear resistance, but they are brittle, poor in toughness, ductility and thermal shock resistance
There is no report on the preparation of porous Mo-Si-B alloys

Method used

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  • Method for preparing high-porosity molybdenum-silicon-boron porous material by adding pore-forming agent
  • Method for preparing high-porosity molybdenum-silicon-boron porous material by adding pore-forming agent
  • Method for preparing high-porosity molybdenum-silicon-boron porous material by adding pore-forming agent

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 32.37vol%Mo according to phase volume ratio 5 SiB 2 -4.5vol%Mo 3 Si-63.13vol%Mo 5 Si 3 Prepare the required mixed powder, use commercial Mo powder (4μm, 99.9wt.%), Si powder (6μm, 99.999wt.%), B powder (3.96μm, 99.99wt.%), add absolute ethanol as a mixture The material medium is placed in a full-range planetary ball mill for mixing for 24 hours, and then dried in a vacuum oven at 50°C for 6 hours; in the dried and uniformly mixed Mo-Si-B element powder, a paraffin gasoline forming agent (paraffin wax content is 20wt.%), the content of paraffin gasoline forming agent accounts for 9wt.% of the total amount of Mo-Si-B element powder and paraffin gasoline forming agent, and then add ammonium bicarbonate pore forming agent after uniformity, the content of ammonium bicarbonate pore forming agent It accounts for 30-60vol.% of the total amount of Mo-Si-B element powder, paraffin gasoline forming agent and ammonium bicarbonate pore-forming agent. After mixing evenly, take an...

Embodiment 2

[0020] 32.37vol%Mo according to phase volume ratio 5 SiB 2 -4.5vol%Mo 3 Si-63.13vol%Mo 5 Si 3 Prepare the required mixed powder, use commercial Mo powder (4μm, 99.9wt.%), Si powder (6μm, 99.999wt.%), B powder (3.96μm, 99.99wt.%), add absolute ethanol as a mixture The material medium was mixed in a full-range planetary ball mill for 24 hours, and then dried in a vacuum oven at 50°C for 6 hours. In the dried uniformly mixed Mo-Si-B element powder, add paraffin gasoline forming agent (paraffin content is 20wt.%), and the content of paraffin gasoline forming agent accounts for the total amount of Mo-Si-B element powder and paraffin gasoline forming agent 9wt.% of 9wt.%, and then add 50vol.% of the total amount of Mo-Si-B element powder, paraffin gasoline forming agent and ammonium bicarbonate pore-forming agent after uniformity, and the particle size is -50+80 mesh, -100+150 mesh, - 150+200 mesh, -200 mesh ammonium bicarbonate pore-forming agent, after mixing evenly, weigh an...

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PUM

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Abstract

The invention relates to a method for preparing a high-porosity molybdenum-silicon-boron porous material by adding a pore-forming agent, and belongs to the field of preparation of refractory metal porous materials. The pore-forming agent is ammonium bicarbonate. The method comprises the following steps of: blending commercial Mo powder, Si powder and B powder according to the volume percent of needed three phases, adding absolute ethyl alcohol, and mixing for 12-36 hours by using an omnibearing planetary ball mill; adding a paraffin gasoline forming agent to uniformly mixed Mo-Si-B element powder, wherein the content of the paraffin gasoline forming agent accounts for 5%-13% of the total weight of the Mo-Si-B element powder and the paraffin gasoline forming agent; uniformly mixing, and then adding the ammonium bicarbonate pore-forming agent, wherein the content of the ammonium bicarbonate pore-forming agent accounts for 30%-75% by volume of the total weight of the Mo-Si-B element powder, the paraffin gasoline forming agent and the ammonium bicarbonate pore-forming agent; uniformly mixing, placing into a high-temperature atmosphere sintering furnace through cold-press moulding, sintering under the protection of an argon atmosphere at normal pressure to prepare a high-porosity Mo5SiB2-Mo3Si-Mo5Si3 three-phase alloy. The prepared high-porosity molybdenum-silicon-boron porous material is adjustable in porosity and pore structure and can meet the requirements for different working conditions in industrial production. The process disclosed by the invention has the advantages of simple process flow and good economy.

Description

technical field [0001] The invention belongs to the field of preparation of refractory metal porous materials, and mainly relates to a preparation method of high-melting point, refractory and high-porosity intermetallic compound molybdenum-silicon-boron porous materials. Background technique [0002] Porous materials are materials containing a large number of pores. Different from dense materials, porous materials have the characteristics of low density, large specific surface area, high specific mechanical properties and good damping properties. They are functional structural materials with great application potential. At present, porous materials have been widely used in many fields such as aerospace, petrochemical, atomic energy, environmental protection, medical treatment, metallurgy, construction and electrochemistry, and are playing an increasingly significant role in the national economy (Liu Peisheng. Introduction to porous materials [M]. Beijing: Tsinghua University...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C27/04
Inventor 张来启王礞高强钟文强林均梁永锋
Owner UNIV OF SCI & TECH BEIJING