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Microwave liquid phase sintering method of high temperature resistant tial porous composite material

A porous composite material, liquid phase sintering technology, applied in the field of TiAl composite material preparation, can solve problems such as unsuitable for industrial application, uncontrollable pore structure, difficult heat insulation, filtration, etc., to enhance the forming process performance, save energy, pore size Rate adjustable effects

Active Publication Date: 2017-11-24
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the TiAl porous composite material prepared by the reaction synthesis method has low porosity and high thermal conductivity, making it difficult to be really applied in the fields of heat insulation and filtration.
[0004] In addition, there are also reports in the literature that magnetron sputtering or spraying methods are used to form TiAl porous materials on the surface of alloy substrates. However, these methods can only prepare porous TiAl locally or on the surface. At the same time, the pore structure cannot be controlled, and the preparation cost is high. Industrial application

Method used

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  • Microwave liquid phase sintering method of high temperature resistant tial porous composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] first step:

[0025] Mixing powder: mix titanium powder and aluminum powder according to the ratio of 64% and 36% by weight, and add 10% SiC particles, wherein the particle size of titanium powder is 10 μm, the particle size of aluminum powder is 100 μm, and the particle size of SiC particles is is 10 μm.

[0026] Step two:

[0027] Powder mixing: adding stearic acid with a weight fraction of 1% of the TiAl powder, adding ammonium bicarbonate with a weight fraction of 1% of the TiAl powder, and putting them into a planetary ball mill for powder mixing, wherein the particle size of the pore-forming agent is 100 μm; The speed of the ball mill is 2 rpm, the time of ball milling is 1 hour, and the ratio of ball to material is 5:1;

[0028] third step:

[0029] Compact: add the powder after powder mixing to a plasticizer with a weight fraction of 3% of the TiAl alloy powder, and mold it into a compact with a molding pressure of 200 MPa, wherein the plasticizer is polyviny...

Embodiment 2

[0036] first step:

[0037] Mixing powder: mix titanium powder and aluminum powder according to the ratio of 70% and 30% by weight, add 50% SiC particles, wherein the particle size of titanium powder is 50 μm, the particle size of aluminum powder is 10 μm, and the particle size of SiC particles 5 μm;

[0038] Step two:

[0039] Powder mixing: add polyethylene glycol with a weight fraction of 20% of the TiAl powder to ammonium carbonate with a weight fraction of 60% of the TiAl powder, add the prepared TiAl powder, and put it into a planetary ball mill for powder mixing, wherein The particle size of the porogen is 200 μm, and the weight fraction in the ingredients is 80%; the ball mill speed is 100 rpm, the ball milling time is 5 hours, and the ball-to-material ratio is 10:1;

[0040] third step:

[0041] Compact: Add the powder after powder mixing to a plasticizer with a weight fraction of 10% of the TiAl powder and mold it into a compact with a molding pressure of 500 MPa,...

Embodiment 3

[0048] first step:

[0049] Mixing powder: mix titanium powder and aluminum powder according to the ratio of 66% and 34% by weight, add 20% SiC particles, wherein the particle size of titanium powder is 20 μm, the particle size of aluminum powder is 50 μm, and the particle size of SiC particles 7μm;

[0050] Step two:

[0051] Powder mixing: for stearic acid with a weight fraction of 10% of the TiAl powder, ammonium carbonate with a weight fraction of 30% of the TiAl powder is added to the prepared TiAl powder, and then put into a planetary ball mill for powder mixing, wherein The particle size of the porogen is 100 μm, and the weight fraction in the ingredients is 50%; the ball mill speed is 80 rpm, the ball milling time is 2 hours, and the ball-to-material ratio is 7:1;

[0052] third step:

[0053] Compact: add the mixed powder to 5% plasticizer of TiAl powder and mold it into a compact with a molding pressure of 400MPa, wherein the plasticizer is polyvinyl acetate;

[00...

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Abstract

A microwave liquid phase sintering method for TiAl porous composite material resistant to high temperature is characterized by comprising the steps of 1, powder blending, wherein titanium powder, aluminum powder and SiC particles are blended according to a proportion; 2, powder mixing, wherein pore forming substances are added into prepared TiAl powder and the mixture is placed in a ball mill for powder mixing; 3, blank pressing, wherein polyvinyl acetate is added into the mixed powder and serves as plasticizers; 4, plasticizer removing, wherein the plasticizers are heated in a muffle furnace and then removed; 5, microwave sintering, wherein after pressed blanks with the plasticizers removed are covered with Al2O3 sand, vacuumizing and argon gas inputting are carried out for microwave sintering. Compared with the prior art, the method has the advantages that the prepared porous composite material is adjustable in porosity and excellent in mechanical property, corrosion resistance and high temperature resistance and can be applied to the fields of heat insulation of special environment, filtering, the chemical industry and catalysis.

Description

technical field [0001] The invention relates to a method for preparing a TiAl composite material. Background technique [0002] Metal bonds and covalent bonds coexist in TiAl intermetallic compounds, and have the properties of both metal and ceramics, such as high melting point, low density, high elastic modulus, good high temperature strength (700-900°C), good flame retardancy, good Its anti-corrosion properties such as strong acid, strong alkali, chloride ion, salt spray, etc., is a new type of lightweight high-temperature resistant structural material with application prospects, and can be widely used in high-temperature heat insulation, chemical industry, filtration, catalysis and other industrial fields. [0003] At present, TiAl alloy porous composite materials are mainly prepared by reaction synthesis. This type of literature can refer to the Chinese invention patent "Preparation method of a fine-grained TiAl intermetallic compound material" (the authorized announcem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C14/00C22C32/00
CPCC22C1/05C22C14/00C22C32/0063
Inventor 陈艳飞刘宽心李晓静郑阳升李睿郑顺奇倪杨
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH