193 results about "Yttrium iron garnet" patented technology

The invention relates to a preparation method of a continuous fiber of a yttrium aluminum garnet. The method comprises the steps of preparing a spinnable precursor sol from aluminum oxide sol containing Al13 colloidal particles, a gamma-AlOOH nano dispersion liquid, yttrium oxide sol, glacial acetic acid and polyvinylpyrrolidone (PVP), preparing a gel continuous fiber by adopting a dry spinning technology and carrying out thermal treatment to obtain the continuous fiber of yttrium aluminum garnet, which is 6-12 microns in diameter. The precursor sol prepared by adopting a sol-gel method is uniform and stable, and can be stored for a long period of time. The length of the gel continuous fiber prepared with dry spinning can reach 3,000m, the fiber subjected to thermal treatment is smooth in surface, the internal structure is compact, the strength is high, and the fiber has very good flexibility, is small in high-temperature creep in a high-temperature using process, and can be widely applied to a composite material and a thermal protection material in the industries such as aerospace. The method is simple in process and short in production period, and industrialization is easy to implement.

The invention discloses a hairpin-type magneto-electric double-tunable microwave filter and a tuning method thereof. The hairpin-type magneto-electric double-tunable microwave filter comprises an aluminum oxide substrate, an electromagnet, a microstrip line, and a magneto-electric laminating material structure. The magneto-electric laminating material structure includes a piezoelectric phase and a ferromagnetic phase from top to bottom. The piezoelectric phase and the ferromagnetic phase are adhered through epoxy resin. Two metal films Ag are plated on the upper and lower surfaces of the piezoelectric phase respectively to form electrodes. The piezoelectric phase is made of Pb-based lanthanum-doped zirconate titanate. The ferromagnetic phase is made of YIG (yttrium iron garnet). The metal microstrip line made on the upper surface of the aluminum oxide substrate by photoetching serves a signal transmission line. The metal microstrip line is hairpin-typed and is in axial symmetry with a lengthwise center line of the substrate as an axis of symmetry. The defects of tuning failure of the traditional filter in operating frequency, failure in precise adjustment of operating frequency and the like are overcome. The hairpin-type magneto-electric double-tunable microwave filter has the advantages of small size and magneto-electric double-tunability. The defects that the traditional magnetically-tunable microwave device is high in operation loss, long in response time and the like are overcome. The hairpin-type magneto-electric double-tunable microwave filter is widely applicable to wireless communication.