In-situ starch solidifying formation process to prepare ceramic biscuit
A ceramic material, solidification molding technology, applied in the field of ceramic materials, to achieve the effects of low price, strong practicability, and a wide range of sources
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Embodiment 1
[0022] Example 1: Preparation of carbon powder body for pure carbon reaction sintering silicon carbide material
[0023] (1) Preparation of ceramic slurry
[0024] First, according to the proportion of its components (wt%), the industrial carbon raw materials are calcined petroleum coke (average particle size 5-20 μm) 78, filler SiO 2 (average particle size 5-10 μm) 21.47, sodium lignosulfonate dispersant 0.5, defoamer 0.03 After metering, add water and ball mill for 1-2 hours to make a ceramic puree with a solid content higher than 50vol%. Then, according to calcined petroleum coke and SiO 2 Wheat starch is added in an amount of 3-5wt% of the dry basis of the raw material, ball milled for 15 minutes, and the remaining air bubbles generated in the pulping process are removed by vacuuming to obtain a ceramic slurry.
[0025] (2) Gelatinization molding
[0026]Put the mold filled with ceramic slurry into a water bath device or a constant temperature oven to heat to the starch...
Embodiment 2
[0033] Example 2: Molding preparation for reaction sintered silicon carbide material green body
[0034] (1) Preparation of ceramic slurry
[0035] First, according to the proportion of its components (wt%), silicon carbide powder (average particle size 5-80 μm) 86, petroleum coke (average particle size 5-20 μm) 13.5, sodium polyacrylate dispersant 0.5, add water , after ball milling and mixing for 1-2 hours, a ceramic puree with a solid phase content of 60 vol% was prepared. Then, add cornstarch and 1-2% hydrolyzed starch according to the amount of silicon carbide and petroleum coke dry basis of 15wt%, and then ball mill for 15-30 minutes, and remove the gas in the slurry by vacuuming to obtain ceramic slurry .
[0036] (2) Subsequent operations, i.e. gelatinization molding, demoulding, drying and carbonization are the same as in Example 1.
[0037] The strength of the dry billet molded according to this formula can reach more than 4.0MPa.
Embodiment 3
[0038] Embodiment 3: for the green body molding of quartz glass ceramics
[0039] (1) Preparation of ceramic slurry
[0040] Firstly, according to the ratio (wt%) of its components, the fused silica glass powder is divided into coarse particle size (average particle size 300 μm) 30, medium particle size (average particle size 35-55 μm) 50, fine particle size (average particle size 2-5μm)20 ratio gradation, adding water, and ball milling for 1-2 hours to make a ceramic puree with a solid content higher than 50vol%. Then, add potato starch according to the mass of quartz glass powder at 1.0 wt%, add acetic acid to adjust the pH value of the mud to 3, and make mud with a water content of about 45 vol%. Subsequent procedures are with embodiment 1.
[0041] (2) Gelatinization molding
[0042] Except that the gelatinization temperature is raised to 85° C., all the other steps are the same as in Example 1.
[0043] (3) demoulding
[0044] The demoulding of wet base is the same w...
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