2 results about "Dysprosium titanate" patented technology

The invention relates to the technical field of reactor and material preparation and processing, in particular to a preparation method of scandium oxide trace doped cubic phase dysprosium titanate, Sc2O3 is used as a doping agent for trace doping, so that the Dy-site average ion radius is reduced to a cubic phase range, chemical components are designed, and the scandium oxide trace doped cubic phase dysprosium titanate is prepared. And the dysprosium titanate material with a cubic phase structure is prepared by a high-temperature solid-phase reaction method. The material is good in structural thermal stability, low in thermal expansion coefficient, high in thermal conductivity and good in application prospect.

This invention discloses a method for preparing high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores, comprising the following steps: S1, ball milling and mixing: Dy2O3 powder and TiO2 powder are dried to completely remove crystal water, and then mixed at a molar ratio of Dy2O3 powder to TiO2 powder of 1:(1~1.2), followed by high-energy mechanical ball milling to obtain a mixed powder; S2, pre-sintering: the mixed powder after high-energy mechanical ball milling is heated at a heating rate of 5~10℃ / min. After holding at 1300-1600℃ for 3-12 hours, the material is cooled to room temperature in the furnace to obtain calcined dysprosium titanate; S3, Smelting: The calcined dysprosium titanate is heated to complete melting, and then the melt is allowed to cool naturally at room temperature. After solidification, as-cast dysprosium titanate is obtained; S4, Mechanical crushing of ingots: The re-solidified as-cast dysprosium titanate is subjected to jaw crushing, high-energy mechanical ball milling, and then the crushed powder is sieved to obtain high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material for nuclear reactor cores.