Dysprosium oxide white crystalline powder with strong magnetic force 12.8 times that of ferric oxide. Relative density 7.81(27/4℃), melting point 2391℃. Dysprosium salt solution, insoluble in water, soluble in acid to form corresponding acid. Easy to absorb carbon dioxide from the air, into the basic dysprosium carbonate. Obtained by burning dysprosium hydroxide, dysprosium carbonate or dysprosium nitrate at 900℃. Used in electronics, radio and nuclear industries.
Dysprosium oxide is a white powder that is slightly hygroscopic and can absorb water and carbon dioxide in the air. Dysprosium oxide is an important rare earth material with wide applications. In addition to the atomic energy industry used as a nuclear reactor control rod, can also be used for metal halogen lamp, magneto-optical memory material, glass, Ndfeb permanent magnet additives. Dysprosium oxide is an important raw material for the preparation of dysprosium metal. Dysprosium is a strategic metal with extremely important uses and is an important part of infrared generator and laser materials. Examples of its applications are as follows:
1) Preparation of a graphene-coated dysprosium oxide nanoparticles by the following steps: 1. Preparation of dysprosium oxide nanoparticles by pyrolysis; Dysprosium oxide nanorods were prepared by hydrothermal method. Three, preparation of go solution; Fourth, dysprosium oxide nanoparticles and dysprosium oxide nanocolumns are added to the go solution, stirred and filtered to obtain a filter residue, which is heat treated to obtain graphene coated dysprosium oxide nanoparticles. In addition, the invention also provides an application of graphene-coated dysprosium oxide nanoparticles prepared by the above method in the process of preparing binary doped magnesium diboride superconducting block material. The present invention has a simple technological method, and uses graphene with high surface area as the coating material, which is conducive to the uniform dispersion of dysprosium oxide nanoparticles and dysprosium oxide nanocolumns on graphene without agglomeration, and is conducive to improving the critical current density Jc performance of binary doped magnesium diboride superconducting block material under low and high fields.
2) Preparation of a kind of dysprosium oxide scandium oxide as an additive to produce high-performance Si3N4 ceramics without pressure sintering. Its composition and mass percentage content are: dysprosium oxide 3%~7%, scandium oxide 5%~8%, silicon nitride 85%~92%. The purpose is to overcome the shortcomings of the existing technology and provide a method for producing high-performance silicon nitride ceramics with dysprosium oxide and scandium oxide as additives without pressure sintering, which can be widely used in chemical, mechanical, metallurgical, aerospace and other fields of spare parts preparation.
3) Molybdenum based dysprosium oxide materials were prepared. Under the protection of inert gas, dried dysprosium oxide powders with a purity of more than 99% and dried molybdenum powders with a purity of more than 99.5% were prepared according to the mass percentage of Mo? (3~55)wt%Dy2O3 was weighed and mixed, then process control agent was added and the final mass concentration was not more than 2.5wt% to get the mixed powder; Under the conditions of ball/material ratio of 0.8~ 35:1, loading coefficient of 0.05~0.85, and ball grinding speed of 80~650rpm, the powder was milled for 2~100h in 45-60min and stopped for 4~12min. Then, the mixed powder after ball milling was pressed 0.05~4h under the pressure of 80~550MPa to form a blank body. After sintering at 1200~1900℃ for 2~110h under inert gas protection, molybdenum base dysprosium oxide pellets were obtained, which are excellent neutron absorption pellets for gray control rods.
