Method for preparing gadolinium oxysulfide ceramic hollow microspheres
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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
Pending Publication Date: 2022-07-22
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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[0003] Currently Gd 2 o 2 The S cold storage material mainly adopts solid microspheres with a diameter of 0.16~0.45mm. Such solid microspheres limit the storage capacity of liquid helium and make it difficult to further improve the refrigeration efficiency.
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preparation example Construction
[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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Abstract
The invention discloses a method for preparing gadolinium oxysulfide ceramic hollow microspheres, which comprises the following steps: adding additives into a water solvent, uniformly mixing to prepare a premixed solution, and the additives comprise a dispersing agent, a monomer, a cross-linking agent, a green body reinforcing agent, a closed pore forming agent and a sintering aid; carrying out ball milling on Gd2O2S ceramic powder and the premixed liquid to prepare Gd2O2S slurry with the solid content of 75-85%, adding an initiator and a catalyst, and uniformly mixing for later use; a semi-arc-shaped super-hydrophobic track coated with a super-hydrophobic film is manufactured, the track is arranged on an inclined rack, and a heating belt is attached to the lower portion of the inclined plane of the track; a dispensing machine needle head is selected to enable a titration needle cylinder to be located at the position 18-15 cm above the track, Gd2O2S ceramic slurry is injected into the titration needle cylinder, the inclined plane is controlled to be heated to 150-210 DEG C, the size of liquid drops is controlled to be 0.18-1 mm through the air inlet pressure of compressed air and the size of a needle hole, the liquid drops drop on the metal track coated with the super-hydrophobic film from the top end of the inclined plane, and the Gd2O2S ceramic slurry is obtained. The Gd2O2S microspheres roll downwards and are heated and cured into Gd2O2S microsphere blanks; and drying and degreasing the formed Gd2O2S ball blank, and sintering to obtain the Gd2O2S ceramic hollow microsphere.
Description
technical field [0001] The invention belongs to the technical field of preparation of inorganic ceramic hollow microspheres, in particular to a method for preparing gadolinium oxysulfide ceramic hollow microspheres. Background technique [0002] With the rapid development of quantum communication technology, the demand for quantum communication in the military, government affairs, and financial industries is very urgent, and the demand for supporting ultra-low temperature technology below 2.5K and the application of related equipment raw materials is increasing. As one of the important devices for quantum computing, the most used refrigerator is a new type of cold storage material Gd 2 O 2 S, among many magnetic regenerator materials, Gd 2 O 2 S has a magnetic phase transition in the temperature range of 2 to 7K, and has a high peak specific heat capacity, which is a practical cold storage material. [0003] Currently Gd 2 O 2 S regenerator materials mainly use solid m...
Claims
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Application Information
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