High Nb containing TiAl porous intermetallic compound gradient material and preparation method thereof

A porous metal, high niobium titanium aluminum technology, applied in the field of intermetallic compounds, can solve problems such as complex processes, and achieve the effects of simple operation, uniform pores, and strong acid and alkali corrosion resistance.

Inactive Publication Date: 2011-03-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing process for preparing porous alloy materials and gradient porous materials is complex, therefore, it is necessary to study a simple, fast and efficient technology for preparing high Nb-TiAl porous gradient materials
[0004]

Method used

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  • High Nb containing TiAl porous intermetallic compound gradient material and preparation method thereof
  • High Nb containing TiAl porous intermetallic compound gradient material and preparation method thereof
  • High Nb containing TiAl porous intermetallic compound gradient material and preparation method thereof

Examples

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Example Embodiment

[0025] Example 1: 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 ratio is carried out according to the Ti-48Al-6Nb (at.%) composition. Compression molding is carried out under the bottom, and a sheet-shaped cold-pressed billet with a diameter of 32mm and a thickness of 2~3mm is pressed. The sintering adopts a two-stage reaction synthesis process, vacuum atmosphere, and the vacuum degree is controlled at 1×10 -2 ~1×10 -3 Pa. The low-temperature reaction sintering temperature is 600°C, and the holding time is 120 minutes; the high-temperature sintering is 1400°C, and the holding time is 180 minutes. After the reaction was completed, the cooling rate was controlled at 10° C. / min. The obtained high-niobium titanium-aluminum porous intermetallic compound has a uniform distribution of pores, a labyrinthine pore structure of different sizes, and a sintered body skeleton composed of γ / α 2 Lamellar composit...

Example Embodiment

[0026] Example 2: 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 ratio is carried out according to the Ti-48Al-8Nb (at.%) composition. Compression molding is carried out under the bottom, and a sheet-shaped cold-pressed billet with a diameter of 32mm and a thickness of 2~3mm is pressed. The sintering adopts a two-stage reaction synthesis process, vacuum atmosphere, and the vacuum degree is controlled at 1×10 -2 ~1×10 -3 Pa. The low-temperature reaction sintering temperature is 600°C, and the holding time is 120 minutes; the high-temperature sintering is 1400°C, and the holding time is 180 minutes. After the reaction was completed, the cooling rate was controlled at 10° C. / min. The obtained high-niobium titanium-aluminum porous intermetallic compound has a uniform distribution of pores, a labyrinthine pore structure of different sizes, and a sintered body skeleton composed of γ / α 2 It consists of shee...

Example Embodiment

[0027] Example 3: Ti powder and Al powder with a particle size of 10 to 25 μm and Nb powder with a particle size of 5 to 25 μm are used for proportioning according to the Ti-48Al-8Nb (at.%) composition. Compression molding is carried out under the bottom, and a sheet-shaped cold-pressed billet with a diameter of 32mm and a thickness of 2~3mm is pressed. The sintering adopts a two-stage reaction synthesis process, vacuum atmosphere, and the vacuum degree is controlled at 1×10 -2 ~1×10 -3 Pa. The low-temperature reaction sintering temperature is 600°C, and the holding time is 120 minutes; the high-temperature sintering is 1400°C, and the holding time is 180 minutes. After the reaction was completed, the cooling rate was controlled at 10° C. / min. The obtained high-niobium titanium-aluminum porous intermetallic compound has a uniform distribution of pores, a labyrinthine pore structure of different sizes, and a sintered body skeleton composed of γ / α 2 It consists of sheets wit...

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Abstract

The invention provides a high Nb containing TiAl porous intermetallic compound gradient material and a preparation method thereof, belongs to the technical field of itermetallic compounds, and relates to a method for preparing the intermetallic compound porous material. The method comprises four parts, namely (1) preparing a high Nb containing TiAl (Ti-48Al-(5-10)N bat. percent) porous intermetallic compound by adopting a powder metallurgical vacuum sintering process, wherein the porosity is between 30 and 60 percent; (2) mixing Ti powder, Al powder and Nb powder for 8 hours according to the atomic percentage (Ti-48Al-(5-10)N bat. percent), and drying the mixed powder to prepare a cold-spraying powder; (3) cleaning the high Nb containing TiAl coarse porous substrate material prepared in the step (1), and depositing the cold-spraying powder which is prepared in the step (2) onto the coarse porous substrate at one time; and (4) performing vacuum insulation sintering by adopting a three-stage sintering process to obtain a fine pore-coarse pore composite gradient porous material. The method has the advantages that the mixed powder of the Ti powder, the Al powder and the Nb powder is directly sprayed on the outer surface of the high Nb-TiAl porous material, and the process is simple and efficient.

Description

[0001] technical field [0002] The invention belongs to the technical field of intermetallic compounds, and in particular provides a gradient material for preparing high-niobium-titanium-aluminum porous intermetallic compound gradient material and a preparation method thereof, specifically combining cold spraying process and powder metallurgy sintering process to prepare high-niobium-titanium-aluminum porous gradient material Methods. Background technique [0003] As a potential lightweight high-temperature structural material, high-niobium-titanium-aluminum intermetallic compounds combine the advantages of ceramics and ordinary metals, exhibiting excellent physical and mechanical properties, as well as excellent high-temperature oxidation resistance and acid-base salt spray corrosion resistance. Using high-niobium-titanium-aluminum intermetallic compounds as porous materials can better solve the technical difficulties of ordinary metals such as poor high-temperature oxidat...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/08
Inventor 林均品杨帆王辉吕昭平郝国建刘敬春陈国良
Owner UNIV OF SCI & TECH BEIJING
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