Preparation method of ceramic powder slurry capable of maintaining shape of billet, and direct ink writing three-dimensional structure preparation method
A ceramic powder, direct writing molding technology, applied in the field of 3D printing molding, can solve the problem that direct writing molding cannot continue, and achieve the effect of a wide range of applications
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Embodiment 1
[0027] Example 1. Preparation of ZrO using polyacrylamide as soluble long-chain organic matter 2 The three-dimensional structure is as follows:
[0028] 3g dispersant sodium polyacrylate and Y 2 O 3 Stable 180g of ZrO 2 The powder (D50 is 0.8μm) is added to 10mL deionized water for ball milling, and then 10% concentration, 2g polyacrylamide aqueous solution (MW 1 million) is added, and ball milling is continued for 1 hour to obtain ZrO2 slurry, where the ball is 200g zirconia balls, ball milling speed is 50 rad / min;
[0029] ZrO to be obtained 2 After the slurry is vacuum stirred and degassed for 5 minutes, direct writing is performed to obtain a crisscross three-dimensional structure. The temperature is controlled at about 32℃, the humidity is controlled at 41%, the direct writing molding pressure is 60PSI, and the print head moving speed is 8mm. / sec.
example 2
[0030] Example 2: Preparation of Si using polyacrylamide as soluble long-chain organic matter 3 N 4 The three-dimensional structure is as follows:
[0031] First combine 8g of dispersant polyethyleneimine and 820g of Si 3 N 4 Powder (D50 is 11μm), 5g sintering aid Y 2 O 3 With 2g of La 2 O 3 Add to 50mL deionized water for ball milling for 13 hours, then add 5% concentration, 2g polyacrylamide aqueous solution (M.W. 1.2 million), continue ball milling for 0.5 hours to obtain Si 3 N 4 Slurry, in which the grinding ball is 800g zirconia ball, and the ball grinding speed is 60 rad / min;
[0032] Si to be obtained 3 N 4 After the slurry is vacuum stirred and degassed for 8 minutes, direct writing is performed to obtain a 30-layer superimposed tubular three-dimensional structure. The temperature is controlled at about 22℃, the humidity is controlled at 61%, and the direct writing molding pressure is 30PSI; the printing head moving speed It is 5mm / sec.
example 3
[0033] Example 3: Preparation of Al by using polyvinyl alcohol as soluble long-chain organic matter 2 O 3 The three-dimensional structure is as follows:
[0034] Mix 6g of dispersant polyacrylic acid and 310g of Al 2 O 3 The powder (D50 is 1.5μm) and 3.1g of sintering aid MgO are added to 50mL of deionized water for ball milling for 20 hours, then 10% concentration, 1g of polyvinyl alcohol aqueous solution (MW 800,000) is added, and ball milling is continued for 2 hours to obtain Al 2 O 3 Slurry, in which the grinding ball is 320g alumina ball, and the ball grinding speed is 10 rad / min;
[0035] Al to be obtained 2 O 3 After the slurry is vacuum stirred and deaerated for 5 minutes, it is subjected to direct writing molding to obtain a three-dimensional structure. The temperature is controlled at about 32℃, the humidity is controlled at 42%, the direct writing molding pressure is 40PSI, and the print head moving speed is 10mm / sec.
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