A method for preparing a 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 excellent high-temperature mechanical properties and oxidation resistance, low density and high service temperature
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Embodiment 1
[0017] Example 1: Ti powder and Al powder with a particle size of 40 to 75 μm and Nb powder with a particle size of 5 to 25 μm are used for proportioning according to the Ti-48Al-6Nb (at.%) composition. Compression molding is carried out under the bottom, and a sheet-shaped cold compact with a diameter of 33 mm and a thickness of 2 to 3 mm 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, the holding time is 120min, the high-temperature sintering is 1350°C, the holding time is 180min, and the pressurized 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 uniform distribution of pores, a labyrinthine pore structure of different sizes, such as figure 1 shown. The skeleton of the sintered ...
Embodiment 2
[0018] Example 2: Ti powder and Al powder with a particle size of 75 to 150 μm and Nb powder with a particle size of 5 to 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 compact with a diameter of 33 mm and a thickness of 2 to 3 mm 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 550°C, the holding time is 150min, and the high-temperature sintering is 1350°C, and the holding time is 180min. The pressurized pressure is 2.1KPa. After the reaction was completed, the cooling rate was controlled at 40° C. / min. The high niobium titanium aluminum porous material thus obtained has a labyrinthine pore structure with uniform pore distribution and different sizes. The skeleton of the sintered body is compose...
Embodiment 3
[0019] 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-6Nb (at.%) composition. Compression molding is carried out under the bottom, and a sheet-shaped cold compact with a diameter of 33 mm and a thickness of 2 to 3 mm 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, the holding time is 120min, and the high-temperature sintering is 1335°C, and the holding time is 180min. The pressurized pressure is 1.6KPa. After the reaction was completed, the cooling rate was controlled at 30° C. / min. The high niobium titanium aluminum porous material thus obtained has a labyrinthine pore structure with uniform pore distribution and different sizes. The skeleton of the sintered body is composed of γ / α 2 I...
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