It is mainly used to manufacture magnetic materials for microwave and important military materials (single crystal, yttrium iron garnet, yttrium aluminium garnet and other composite oxides), as well as optical glass, ceramic additives, high brightness phosphors for large screen TV and other picture tube coatings. It is also used to manufacture thin film capacitors and special refractories, as well as magnetic bubble materials for high-pressure mercury lamps, lasers, storage elements, etc. Adding yttrium oxide during sintering can effectively reduce the grain size of tungsten alloy.