Method for preparing silicon carbide ceramic impeller through gel casting and pressureless sintering
A technology of gel injection molding and silicon carbide ceramics, which is applied in the field of material preparation, can solve the problems of complex and accurate large-size pump impellers, etc., and achieve the effects of ensuring high strength, suppressing cracks, and eliminating cracks
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Embodiment 1
[0029] Add 9500g of silicon carbide powder, 200g of boron carbide powder, and 300g of carbon black powder into 25L of deionized water, add 100ml of glycerol as a dispersant, ball mill and mix for 24 hours, and spray dry to obtain a uniformly mixed powder for use;
[0030] Add 1905g of acrylamide, 95g of N,N-methylenebisacrylamide, and 200ml of tetramethylammonium hydroxide into 7.8L of deionized water, stir fully, and prepare an organic premix for use;
[0031]Take 523ml of organic premixed solution, and gradually add 2000g of premixed ceramic powder while stirring mechanically, to prepare ceramic slurry;
[0032] Put the ceramic slurry in the vacuum box, vacuum defoaming for 20min;
[0033] Add 2.76g initiator APS and 0.28g catalyst TEMED to the ceramic slurry, and stir evenly;
[0034] Inject the ceramic slurry into a special ceramic impeller mold, solidify at room temperature, and demould to obtain a complex-shaped silicon carbide ceramic impeller green body;
[003...
Embodiment 2
[0041] Add 9920g of silicon carbide powder, 30g of boron carbide powder, and 50g of carbon black powder into 25L of deionized water, add 100ml of glycerol as a dispersant, stir and grind the mixture for 8 hours, vacuum dry, crush, and sieve to 80 meshes to obtain The mixed powder that is mixed evenly is ready for use;
[0042] Add 1,200g of acrylamide, 100g of N,N-methylenebisacrylamide, and 500ml of tetramethylammonium hydroxide into 8,200L of deionized water, fully mechanically stir, and prepare an organic compound solution for use;
[0043] Take 760ml of organic premixed liquid, and gradually add 2000g of premixed ceramic powder while stirring mechanically, to prepare ceramic slurry;
[0044] Put the ceramic slurry in a vacuum box, and vacuum defoaming for 10 minutes;
[0045] Add 0.55g initiator APS and 1.38g catalyst TEMED to the ceramic slurry, and stir evenly;
[0046] Inject the ceramic slurry into a special ceramic impeller mold, ...
Embodiment 3
[0053] Add 9920g of silicon carbide powder, 30g of boron carbide powder, and 50g of carbon black powder into 25L of deionized water, add 100ml of glycerol as a dispersant, stir and grind the mixture for 8 hours, vacuum dry, crush, and sieve to 80 meshes to obtain The mixed powder that is mixed evenly is ready for use;
[0054] Add 1,200g of acrylamide, 100g of N,N-methylenebisacrylamide, and 500ml of tetramethylammonium hydroxide into 8,200L of deionized water, fully mechanically stir, and prepare an organic compound solution for use;
[0055] Take 760ml of organic premixed liquid, and gradually add 2000g of premixed ceramic powder while stirring mechanically, to prepare ceramic slurry;
[0056] Put the ceramic slurry in a vacuum box, and vacuum defoaming for 10 minutes;
[0057] Add 0.55g initiator APS and 1.38g catalyst TEMED to the ceramic slurry, and stir evenly;
[0058] Inject the ceramic slurry into a special ceramic impeller mold, solidify at room temperature, and de...
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