Method for preparing aperture gradient homogeneous Ti-Al intermetallic compound filter membrane
A technology of intermetallic compounds and filter membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as short service life, poor structure stability of metal materials, poor formability and sintering performance of ceramic particles, etc. , to achieve the effect of improving filtration performance and service life, improving anti-oxidation performance and excellent mechanical properties
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Embodiment 1
[0018] Ti powder with a particle size of 100-150 μm and Al powder with a particle size of 50-100 μm are used for mixing according to the composition ratio of Ti-46.5at.% Al; then molded under a pressure of 200 MPa, and the Al foil is placed in the The end of the punch of the ordinary molding machine is made into a composite sheet blank with a diameter of 50mm and a thickness of 1-2mm; the sintering adopts a two-stage reaction method, the atmosphere is vacuum, and the vacuum degree is controlled at 1×10 -2 ~1×10 -3 Pa, the low-temperature pre-reaction temperature is 600°C, the holding time is 60min, the high-temperature short-term reaction temperature is 1300°C, and the holding time is 20min; after the reaction is completed, the cooling rate is controlled at 40°C / min; Gradient homogeneous sheet filter membrane with a porosity of 40-45% and an open porosity of 30-35%. It also has good oxidation resistance and corrosion resistance.
Embodiment 2
[0020] Ti powder with a particle size of 20-50 μm and Al powder with a particle size of 50-100 μm are used for mixing according to the composition ratio of Ti-48at.% Al; then cold isostatic pressing is used to form a tubular billet, and the Al foil is closely attached to the On the outer side of the core rod, the taper of the core rod is 0.5°, and the pressure is 150MPa. After a small amount of machining, a composite tubular forming blank with an outer diameter of 30mm, an inner diameter of 28-29mm, and a height of 200mm is obtained; the sintering adopts a two-stage reaction method, The atmosphere is vacuum, and the vacuum degree is controlled at 1×10 -2 ~1×10 -3 Pa; the low-temperature pre-reaction temperature is 620°C, the holding time is 40min, the high-temperature short-term reaction temperature is 1260°C, and the holding time is 30min; after the reaction is completed, the cooling rate is controlled at 30°C / min. In this way, a TiAl intermetallic compound pore size gradien...
Embodiment 3
[0022] Ti powder with a particle size of 150-200μm and Al powder with a particle size of 20-50μm are used for mixing according to the composition ratio of Ti-48.5at.%Al; molded under a pressure of 200MPa to make a diameter of 50mm and a thickness of 1-2mm flake billet; then the composite forming billet is made by immersing the surface of Al liquid, the immersion temperature is 700°C, the immersion time is 2min, and the thickness of the immersion layer is 20μm; sintering adopts low-pressure hot isostatic pressing , the atmosphere is Ar gas, the pressure is 0.1MPa, the low-temperature pre-reaction temperature is 620°C, and the holding time is 40min; the high-temperature short-term reaction temperature is 1300°C, and the holding time is 10min; after the reaction, the cooling rate is controlled at 20°C / min. The thus prepared TiAl intermetallic compound pore size gradient homogeneous sheet filter membrane has a porosity of 35-40%, an open porosity of 25-35%, and has good oxidation r...
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