Method for preparing high Nb-Ti-Lu porous material

A technology of high niobium titanium aluminum and porous materials, applied in the field of intermetallic compounds, to achieve the effects of low density, improved service life and service environment, and high service temperature

Active Publication Date: 2007-12-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing high Nb-Ti-Lu porous material
  • Method for preparing high Nb-Ti-Lu porous material

Examples

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Embodiment 1

[0017] Example 1: Ti powder and Al powder with a particle size of 40-75 μm, and Nb powder with a particle size of 5-25 μm are used, and the proportions are carried out according to the composition of Ti-48AI-6Nb (at.%). Pressing is carried out at the bottom, and a sheet-like cold compact with a diameter of 33 mm and a thickness of 2 to 3 mm is pressed out. Sintering adopts a two-stage reaction synthesis process, and the vacuum atmosphere is controlled at 1 × 10 -2 ~1×10 -3 pa. The low temperature reaction sintering temperature is 600℃, the holding time is 120min, the high temperature sintering is 1350℃, the holding time is 180min, and the pressing pressure is 1.2KPa. After the reaction was completed, the cooling rate was controlled at 30°C / min. The high-niobium-titanium-aluminum porous material obtained in this way has a pore structure with uniform pore distribution, different sizes and a labyrinth-like pore structure, as shown in Figure 1. The framework of the sintered bo...

Embodiment 2

[0018] Example 2: Ti powder and Al powder with a particle size of 75-150 μm and Nb powder with a particle size of 5-25 μm are used, and the proportions are carried out according to the composition of Ti-48Al-8Nb (at.%). Pressing is carried out at the bottom, and a sheet-like cold compact with a diameter of 33 mm and a thickness of 2 to 3 mm is pressed out. Sintering adopts a two-stage reaction synthesis process, and the vacuum atmosphere is controlled at 1 × 10 -2 ~1×10 -3 pa. The low temperature reaction sintering temperature is 550°C, the holding time is 150min, and the high temperature sintering is 1350°C, and the holding time is 180min. The pressing pressure was 2.1KPa. After the reaction was completed, the cooling rate was controlled at 40°C / min. The high niobium titanium aluminum porous material obtained in this way has a pore structure with uniform pore distribution, different sizes and a labyrinth-like pore structure. The sintered body skeleton consists of γ / α 2 ...

Embodiment 3

[0019] Example 3: Ti powder and Al powder with a particle size of 10-25 μm and Nb powder with a particle size of 5-25 μm are used, and the proportions are carried out according to the composition of Ti-48Al-6Nb (at.%). Pressing is carried out at the bottom, and a sheet-like cold compact with a diameter of 33 mm and a thickness of 2 to 3 mm is pressed out. Sintering adopts a two-stage reaction synthesis process, and the vacuum atmosphere is controlled at 1 × 10 -2 ~1×10 -3 Pa. The low temperature reaction sintering temperature is 600 ℃, the holding time is 120 min, and the high temperature sintering is 1335 ℃, and the holding time is 180 min. The pressing pressure was 1.6KPa. After the reaction was completed, the cooling rate was controlled at 30°C / min. The high niobium titanium aluminum porous material obtained in this way has a pore structure with uniform pore distribution, different sizes and a labyrinth-like pore structure. The sintered body skeleton consists of γ / α 2...

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Abstract

This invention relates to the production of intermetallic compounds. The raw materials of titanium powder, aluminium powder and niobium powder mixture is pressed to form billets by using die forming method. The lower temperature pre-reaction at temperature of 500-800 deg.C for 50-150 min is proceeded upon the billets; and then higher temperature sintering synthesis of up-said billets is proceeded at temperature of 1300-1400 deg.C for 60-180 min. vacuum low pressure sintering method is used for said reaction with its vacuum degree of 0.1-0.001 Pa, and its pressure of 0.5-10 KPa to produce high niobium titanium aluminium porous intermetallic compound.

Description

technical field [0001] The invention belongs to the technical field of intermetallic compounds, and particularly provides a method for preparing high niobium titanium aluminum porous materials. Specifically, it is a preparation method for synthesizing high-niobium titanium-aluminum porous intermetallic compound by reaction of titanium, aluminum and niobium element powder. Background technique [0002] Porous materials have become high-performance functional-structural materials with great application potential due to their excellent physical and mechanical properties. The high porosity of the porous material makes it have a small density and low thermal conductivity, resulting in a huge thermal resistance and a small volumetric heat capacity, making it a traditional thermal insulation material. Porous materials have been widely used in many industrial fields such as aerospace, energy, chemical industry and metallurgy. The biggest defects of ordinary porous metal materials ...

Claims

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Application Information

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IPC IPC(8): C22C1/04B22F3/12
Inventor 林均品王衍行贺跃辉王艳丽叶丰孙刚陈国良
Owner UNIV OF SCI & TECH BEIJING
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