Method for preparing gadolinium oxysulfide ceramic hollow microspheres
A technology of ceramic hollow microspheres and gadolinium oxysulfide, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of limited storage capacity of liquid helium, difficulty in further improving refrigeration efficiency, etc., and achieves spherical size uniformity Guaranteed, high sphericity, the effect of increasing storage capacity
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[0041]Step 1. Gd 2 O 2 Preparation of S ceramic slurry
[0042] ① Preparation of premix
[0043] Select Gd with an average particle size of 1~2μm 2 O 2 S ceramic powder, use the gel injection molding process to prepare a premixed liquid with a solid content of 75~85% slurry. The proportion of mass is: dispersant accounts for 0.50%~2.12%, monomer accounts for 1.05%~5.50%, crosslinking agent accounts for 0.05%~0.51%, green body reinforcement accounts for 0.05~0.10%, closed cell pore former accounts for 18.8% ~27.4%, sintering aids account for 0.9~2.0%, always use a magnetic rotor or mechanical stirring bar to stir in the process of configuring the premix, so that the additives in the water solvent are mixed evenly;
[0044] Wherein the green body reinforcing agent is cotton fibers, the closed-cell pore-forming agent is one or more of calcium sulfate, calcium hydroxide, calcium carbonate, and aluminum sulfate, and the sintering aid is aluminum oxide, oxide One or more of ti...
Embodiment 1
[0066] A preparation of Gd 2 O 2 The method of S ceramic hollow microspheres
[0067] Take Gd with an average particle size of 1 μm 2 O 2 S powder 1000g, according to the target solid content of 85%, weigh a certain amount of water to prepare a premix. Add 2.80% of acrylamide, 0.43% of N-N' methylenebisacrylamide, 1.6% of ammonium polycarboxylate, 0.5% of cotton fiber reinforcement, 20% of calcium sulfate pore-forming agent in water , 1.6% bismuth oxide sintering aid, continue to stir for 20min to obtain a premix containing pore-forming agent and sintering aid. Gd 2 O 2 S powder and premix are added into a 20L planetary ball mill tank, wherein the ball tank is a polyurethane tank, and the ball milling medium is ZrO with a diameter of 5mm 2 The ratio of material to ball (mass ratio) is 2:1. The ball milling speed is set to 200r / min. After 15h ball milling, the slurry has good fluidity. The measured viscosity value is 121mPa s (room temperature, speed 20s). -1 ). Add 0...
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