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Preparation method of gradient pore porous high-niobium titanium-aluminum alloy

A titanium-aluminum alloy and gradient hole technology is applied in the field of preparation of gradient hole porous high-niobium-titanium-aluminum alloy to achieve the effects of high yield, simple preparation process and low cost

Inactive Publication Date: 2011-02-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the existing problem of preparing porous high-niobium-titanium-aluminum alloys with gradient pores, the present invention proposes a method for preparing porous high-niobium-titanium-aluminum alloys with a gradient pore structure that is simple in preparation process, low in cost, high in yield, and capable of realizing large-scale size.

Method used

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  • Preparation method of gradient pore porous high-niobium titanium-aluminum alloy
  • Preparation method of gradient pore porous high-niobium titanium-aluminum alloy
  • Preparation method of gradient pore porous high-niobium titanium-aluminum alloy

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Embodiment 1

[0025] The first step: uniformly mix titanium, aluminum and niobium element powders in proportions of 50% (mass fraction, the same below), 40% and 10% respectively, the particle size of the titanium powder is 50um, and the particle size of the aluminum powder is 50um , the particle size of niobium powder is 12um;

[0026] The second step: 5 parts of mixed titanium aluminum niobium powder and NH 4 HCO 3 and polyethylene glycol were made into 5 sheet blanks, the pressing pressure was 50MPa, and the thickness was 1.5mm, of which NH 4 HCO 3 The contents are 46%, 40%, 31%, 25% and 11%, polyethylene glycol and NH 4 HCO 3 The ratio of 25:1;

[0027] The third step: According to the ratio of the amount of titanium, aluminum and niobium powder, five sheet-shaped blanks are sequentially stacked and regularized, and then rolled for the second time. The pressing pressure is 120MPa to obtain the total billet;

[0028] Step 4: Put the total billet into a vacuum drying oven and heat it...

Embodiment 2

[0031] The first step: uniformly mix titanium, aluminum and niobium element powders according to the ratio of 55%, 35% and 10% respectively, the particle size of titanium powder is 100um, the particle size of aluminum powder is 100um, and the particle size of niobium powder is 12um;

[0032] The second step: 5 parts of mixed titanium aluminum niobium powder and NH 4 HCO 3 and polyethylene glycol were made into 5 sheet blanks, the pressing pressure was 50MPa, and the thickness was 2mm, of which NH 4 HCO 3 The contents were 51%, 41%, 31%, 21%, 11% and 1%, polyethylene glycol and NH 4 HCO 3 The ratio of 25:1;

[0033] The third step: According to the ratio of the amount of titanium, aluminum and niobium powder, the 6 sheet-shaped billets are stacked sequentially and then rolled for the second time. The pressing pressure is 180MPa to obtain the total billet;

[0034] Step 4: Put the total billet into a vacuum drying oven and heat it to 110°C, and keep it warm for 2 hours to ...

Embodiment 3

[0037] The first step: uniformly mix titanium, aluminum and niobium element powders in proportions of 55% (mass fraction, the same below), 35% and 10% respectively, the particle size of the titanium powder is 10um, and the particle size of the aluminum powder is 5um , the particle size of niobium powder is 2um;

[0038] Step 2: Mix 3 parts of titanium, aluminum and niobium powder with NH by compression molding 4 HCO 3 and polyethylene glycol were made into three sheet blanks, the pressing pressure was 50MPa, and the thickness was 2.5mm, of which NH 4 HCO 3 The contents were 51%, 31% and 11%, polyethylene glycol and NH 4 HCO 3 The ratio of 25:1;

[0039]Step 3: According to the ratio of the amount of titanium, aluminum and niobium powder, the three sheet-shaped blanks are stacked in sequence, and then rolled for the second time. The pressing pressure is 200MPa to obtain the total billet;

[0040] Step 4: Put the total billet into a vacuum drying oven and heat it to 120°C,...

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Abstract

The invention belongs to the field of porous metal materials and particularly relates to a preparation method of a gradient pore porous high-niobium titanium-aluminum alloy. The method comprises the following steps of: mixing pure titanium powder, pure aluminum powder and pure niobium powder and sintering the mixture by a Kerkendill effect reaction pore-forming method and a pore-forming agent physical pore-forming method; adding a plurality of ingredients; compacting the ingredients which contain different pore-forming agents and have different content into single blanks respectively; rolling a plurality of single blanks with different pore-forming agent content into the total blank; and performing a vacuum drying degreasing pore-foaming and high-temperature sintering reaction pore-forming process so as to finally obtain a porous high-niobium titanium-aluminum alloy material with a gradient hole structural characteristic and adjustable porosity. The material has gradient porosity change, optionally-adjustable pore structural characteristic, adjustable stress cross section, light weight, high specific stiffness and high heat insulation performance; simultaneously, the material has high material design flexibility and can be widely applied to the industrial fields of high temperature heat insulation, filtering separation, catalysis and the like.

Description

technical field [0001] The invention relates to a porous intermetallic compound material, and discloses a method for preparing a porous high-niobium-titanium-aluminum alloy with gradient pores. Background technique [0002] Titanium-aluminum intermetallic compounds have properties such as light weight, high strength, corrosion resistance and high-temperature oxidation resistance due to the joint action of interatomic metal bonds and covalent bonds. The niobium-titanium-aluminum intermetallic compound can significantly improve the high-temperature resistance and creep strength of titanium-aluminum materials, and has broad application prospects in high-temperature heat insulation, filtration and catalysis and other industrial fields. Due to the Kerkendill effect, porous high-niobium-titanium-aluminum alloys can be obtained by elemental powder metallurgy. The micron-sized pores not only further improve the modulus and light-weight properties of high-niobium-titanium-aluminum al...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C14/00
Inventor 王辉吕昭平杨帆林均品贺跃辉陈国良
Owner UNIV OF SCI & TECH BEIJING
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