Preparation technique of porous stainless steel-ceramic compound film
A preparation process, stainless steel technology, applied in the field of composite membrane material preparation, can solve problems such as poor adhesion of ceramic layers, and achieve the effect of improving surface flatness
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Embodiment 1
[0026] (1) The substrate used is a 316L porous stainless steel tube with an outer diameter of 20 mm and a wall thickness of 3 mm, with an average pore diameter of 30 μm. They were cleaned by acid-base ultrasonic cleaning, then cleaned with deionized water, and dried for later use.
[0027] (2) Mix 100g 316L stainless steel powder (particle size range 20-50μm) with 100ml of 5% PVA solution and stir vigorously to form a slurry, spray the slurry evenly on the surface of the substrate to form a stainless steel powder layer with a thickness of 200μm, put it in an oven Dry at 120°C for 2 hours.
[0028] (3) Add 1g PEI and 0.5g silicone defoamer to 100ml PVA solution with a concentration of 5%, stir and mix, and slowly add 30g Al with an average particle size of 1 μm 2 O 3 powder, then add distilled water to dilute to 200ml, and prepare a suspension by ultrasonic dispersion. It was sprayed on the surface of the stainless steel powder layer of the substrate to form a ceramic powder...
Embodiment 2
[0031] (1) A 304L-type porous stainless steel disc with a diameter of 30 mm, a thickness of 2 mm and an average pore diameter of 30 μm was used as the substrate, which was cleaned by acid and alkali ultrasonic cleaning, then cleaned with deionized water, and dried for use.
[0032] (2) Mix 300g of 316L stainless steel powder (particle size range 20-50μm) with 100ml of 5% PVA solution and vigorously stir to form a slurry, brush the slurry evenly on the surface of the substrate to form a stainless steel powder layer with a thickness of 500μm. Dry in an oven at 120°C for 2 hours.
[0033] (3) Same as step (3) of Example 1, with a thickness of 200 μm.
[0034] (4) Same as step (4) in Example 1, the sintering temperature was kept at 1300° C. for 1 hour.
Embodiment 3
[0036] (1) The substrate used is a 316L porous stainless steel tube with an outer diameter of 20 mm and a wall thickness of 3 mm, with an average pore diameter of 10 μm. They were cleaned by acid-base ultrasonic cleaning, then cleaned with deionized water, and dried for later use.
[0037] (2) Mix 10g of 316L stainless steel powder (particle size range 1-5μm) with 100ml of 3% PVA solution and stir vigorously to form a slurry. Brush the slurry evenly on the surface of the substrate to form a stainless steel powder layer with a thickness of 50μm. Dry in an oven at 120°C for 2 hours.
[0038] (3) Add 1g PEI, 1g MC and 0.5g organosilicon defoamer to 200ml ionized water, stir and mix, and slowly add 10g TiO with an average particle size of 0.2μm 2 The powder was dispersed by ultrasonic to prepare a suspension. It was sprayed on the surface of the stainless steel powder layer of the substrate to form a ceramic powder layer with a thickness of 20 μm, which was air-dried at room tem...
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