The chemical formula of gadolinium oxide is Gd2O3, a molecular weight of 362.498000, a melting point of 2330℃, and a density of 7.407. It is a white powder.
Gadolinium oxide appears as a white, odorless, amorphous powder, with a density of 7.407g/cm3, a monoclinic system with a density of 8.297g/cm3, and a melting point of approximately 2330±20℃ (some data say it is 2420℃). Gadolinium oxide is insoluble in water, but soluble in acid to form the corresponding salt. When exposed to the air, it is easy to absorb water and carbon dioxide in the air and deteriorate. It can react with ammonia to form gadolinium hydrate precipitation.
Mix 10g of micron-grade gadolinium oxide powder with hydrochloric acid with a concentration of 3.23 mol·L, heat it until the reaction is complete, and add a certain amount of polyethylene glycol (which acts as a dispersant to make the prepared gadolinium chloride). The milky white colloidal precursor will exist stably for a long time), fully stir to dissolve and disperse polyethylene glycol, and then add deionized water to adjust the Gd concentration to 0.2mol·L. , And cooled to room temperature; under vigorous stirring, add dropwise ammonia water with a concentration of 1 mol·L to the prepared gadolinium chloride solution until the pH value reaches 9, and fully react with stirring for 30 min to generate gadolinium hydroxide colloid. Then, under vigorous stirring, deionized water was added to the prepared colloid to obtain 500 mL of a suspension solution, which was spray-dried after being uniformly dispersed to obtain a precursor. The precursor is calcined at different temperatures (600-900℃) for several hours to obtain nano-gadolinium oxide.
1. Used to prepare gadolinium oxide ceramics. Gadolinium has no solubility in stainless steel or nickel-based metals, and a gadolinium-rich second-phase eutectic product (Ni, Cr) Gd is easily formed on the grain boundary. Hot rolling is likely to produce a second phase and cause anisotropy. The incorporation of gadolinium oxide into the composite material greatly improves the neutron shielding performance of the material. Gadolinium oxide ceramics have the advantages of high mechanical strength, good wear resistance, corrosion resistance, and excellent thermal stability.
2. Used to prepare polyether ether ketone compound containing gadolinium oxide. Polyether ether ketone resin is an important family of special engineering plastics that have been successfully developed. It has high heat resistance, radiation resistance, hydrolysis resistance, antistatic, high impact strength, good wear resistance and fatigue resistance, and Excellent combustion and electrical performance. Since its commercialization, it has been widely used in the fields of aerospace, automobiles, electronic appliances, chemicals, machinery, and medical and health.
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