Preparation method for porous ceramics
A technology of porous ceramics and steaming, applied in the field of porous ceramics, can solve problems such as difficult control of process conditions, limited shape of ceramic products, complicated process, etc., to expand the range of product shapes and varieties, easy control of preparation process parameters, and preparation The effect of simple process
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Embodiment 1
[0036] Take 100 parts of alumina granular aggregate in parts by mass as a benchmark, add 2 parts of polyvinyl alcohol organic binder, 150 parts of ordinary flour, and 5 parts of yeast for batching, and stir for 120 minutes to obtain a uniform mixture; press Mix 30% of the total mass of the material is added to the mixture with tap water at a temperature of 25°C, and mixed for 3 minutes at 40 rpm to obtain a green body of the desired shape; Under the condition of ℃, leave it for 240 minutes to carry out fermentation; under normal pressure and air atmosphere, the green body is steamed, the steaming temperature is 100 ℃, and the steaming time is 50 minutes, so that carbon dioxide gas escapes; The steamed green body is sintered in an air atmosphere, the sintering temperature is 1500 ℃, and the sintering time is 200 minutes to volatilize the organic matter and obtain a high-porosity, low-density, high-quality alumina porous ceramic. figure 1 It is a microstructure diagram of the al...
Embodiment 2
[0038] Take 100 parts by mass of silicon carbide granular aggregate as a benchmark, add 10 parts of polycarbosilane inorganic binder, 50 parts of ordinary flour, and 1 part of yeast for batching, stir for 30 minutes, and obtain a uniform mixture; press Mix 10% of the total mass of the material is added to the mixture with hot water at a temperature of 40°C, and mixed for 20 minutes at 20 rpm to obtain a green body of the desired shape; put the green body into a closed space, Under the condition of 40°C, leave it for 120 minutes for fermentation; bake the green body under normal pressure and air atmosphere, the baking temperature is 260°C, and the baking time is 10 minutes, so that carbon dioxide gas can escape; 1. Sinter the baked green body in an air atmosphere, the sintering temperature is 1400 ℃, and the sintering time is 150 minutes, so that the organic matter is volatilized, and a high-porosity, low-density, high-quality silicon carbide porous ceramic is obtained.
Embodiment 3
[0040] Take 100 parts of silicon nitride granular aggregate in parts by mass as a benchmark, add 5 parts of polyvinyl alcohol organic binder, 100 parts of refined grade flour, and 3 parts of yeast for batching, and stir for 90 minutes to obtain a uniform mixture; press 20% of the total mass of the mixture is added to the mixture with pure water at a temperature of 30 °C, and mixed for 10 minutes at 30 rpm to obtain a green body of the desired shape; put the green body into a closed space, Under the condition of 30°C, leave it for 180 minutes to ferment; bake the green body under normal pressure and air atmosphere, the baking temperature is 180°C, and the baking time is 40 minutes, so that carbon dioxide gas escapes; The baked green body was sintered under the protective atmosphere of pressure and flowing nitrogen. The sintering temperature was 1750°C and the sintering time was 90 minutes to volatilize the organic matter and obtain a high-porosity, low-density, high-quality sili...
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