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Porous rare earth titanate heat-isolating material and preparation method and application thereof

A technology of rare earth titanate and thermal insulation materials, applied in the field of materials, can solve problems such as volume expansion and structural damage, and achieve the effects of reduced absorption, low stability, and low thermal conductivity

Active Publication Date: 2019-04-09
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the operating temperature of the reactor usually fluctuates above 300 °C, it will lead to a monoclinic phase transition, causing volume expansion and structural damage

Method used

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  • Porous rare earth titanate heat-isolating material and preparation method and application thereof
  • Porous rare earth titanate heat-isolating material and preparation method and application thereof
  • Porous rare earth titanate heat-isolating material and preparation method and application thereof

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preparation example Construction

[0041] As an example of a preparation method of a porous rare earth titanate-based ceramic heat insulating material, the composition of the porous rare earth titanate based ceramic heat insulating 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 with water or liquid organic solvents for ball milling or sand milling. 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 are ...

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. In the above slurry, add PMMA that accounts for 50% of the volume ratio of all solid raw materials 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 was 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 materi...

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. In the above slurry, add polystyrene balls with a volume ratio of 70% 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 body was subjected to debinding treatment 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 ...

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Abstract

The invention relates to a porous rare earth titanate heat-isolating material and a preparation method and an application thereof. The porous rare earth titanate heat-isolating material is of a porousstructure and the composition of the material is (Re2O3)X(TiO2)(1-X), wherein Re is at least one of Y and lanthanide elements, and X is equal to 0.2-0.8, preferably 0.4-0.7. The porosity of the porous rare earth titanate heat-isolating material is 10-90% and the pore diameter is 0.1-500 microns.

Description

technical field [0001] The invention relates to a porous rare-earth titanate thermal insulation material which can be used in high-temperature, high-humidity and nuclear reactors and a preparation method thereof, belonging to the field of materials. Background technique [0002] As the electric energy with the least greenhouse gas emission, nuclear power is one of the most effective ways for human beings to utilize nuclear energy. There are more than 400 nuclear power plants in operation in the world, mainly of the second-generation type of PWR and BWR. After the Fukushima accident in 2011, all countries are promoting the development and construction of more advanced and safe third-generation pressurized water reactors. shutdown. In addition, by simplifying the design of pipelines and valve pumps, and for the zirconium alloy cladding tube to react with water in a high-temperature hydrothermal environment to generate hydrogen, a hydrogen elimination device is added. A cool...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/505C04B35/50C04B38/06C04B35/462C04B38/02C04B35/64
CPCC04B35/462C04B35/50C04B35/505C04B35/64C04B38/02C04B38/067C04B2235/3232C04B2235/656C04B2235/96C04B2235/9607C04B38/0074
Inventor 范武刚张兆泉董满江
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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