A kind of porous rare earth titanate thermal insulation material and its preparation method and application
A technology of rare earth titanate and thermal insulation material, applied in the field of materials, can solve problems such as volume expansion and structural damage
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[0041] As an example of a preparation method of a porous rare-earth titanate-based ceramic insulation material, the composition of the porous rare-earth titanate-based ceramic insulation material is Re 2 TiO 5 and Re 2 Ti 2 o 7 , R stands for Y and lanthanide rare earth elements, using a solid-phase synthesis process, the steps are as follows: the compound containing titanium, including TiO 2 , Ti 2 o 3 And Ti powder, etc., are mixed with rare earth oxides, hydroxides, nitrates, etc. according to a certain molar ratio, and then mixed by ball milling or sand milling with water or liquid organic solvent as the medium. The mixing time is 0.5-48 hours. Add a certain proportion of pore-forming agent into the slurry and continue mixing for 0.5-5 hours. The slurry is dried at 60-100°C or pre-filtered and then dried, and sieved (the mesh size of the sieve can be 80-200 mesh.) to remove large particles. The obtained powder is pressed into tablets, and debinding and sintering ar...
Embodiment 1
[0045] Example 1 Y 2 TiO 5 Porous insulation ceramics
[0046] Titanium dioxide powder (10g) and yttrium oxide were mixed in a molar ratio of 1:1, citric acid (0.2g) was added as a dispersant, water (30g) was used as a ball milling medium, and zirconia balls were used to mill for 4 hours. Add PMMA accounting for 50% of the volume ratio of all solid raw materials into the above slurry as a pore-forming agent, continue ball milling for 1 hour, and then dry at 80°C. After sieving, dry pressing and cold isostatic pressing, the biscuit is obtained. The green compact is subjected to debinding treatment at 600° C. for 2 hours, and then sintered at 1200° C. for 10 hours under air atmosphere conditions to obtain a porous yttrium titanate ceramic heat insulating material. It was made into a disc with a diameter of 50mm and a thickness of 5mm for heat insulation test, and the thermal conductivity was 0.18W / mK at 30°C. The obtained porous yttrium titanate ceramic heat insulating mater...
Embodiment 2
[0047] Example 2 Y 2 Ti 2 o 7 Porous insulation ceramics
[0048] Ti powder (50g) and yttrium oxide were mixed according to the molar ratio of 2:1, polyethylene glycol (5g) was added as a dispersant, ethanol (50g) was used as a ball milling medium, and a sand mill was used to circulate the mixture for 1 hour. Add polystyrene balls with a volume ratio of 70% to the above slurry as a pore-forming agent, continue sanding for 0.5 hour, and then dry at 60°C. After sieving, dry pressing and cold isostatic pressing, the biscuit is obtained. The green compact was debinding at 500°C for 1 hour, and then sintered at 1300°C for 5 hours under an oxygen atmosphere to obtain porous yttrium titanate (Y 2 Ti 2 o 7) Ceramic insulation material. It was made into a disc with a diameter of 50mm and a thickness of 5mm for heat insulation test, and the thermal conductivity was 0.12W / mK at 30°C. The obtained porous yttrium titanate ceramic heat insulating material had a porosity of 68% and a...
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