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    • 40. 发明专利
    • PRODUCTION OF PHENIUM DIBORIDE SINGLE CRYSTAL
    • JPH10251095A
    • 1998-09-22
    • JP8191397
    • 1997-03-14
    • NAT INST RES INORGANIC MAT
    • OTANI SHIGEKIAIZAWA TAKASHIISHIZAWA YOSHIO
    • C30B13/00C30B29/10
    • PROBLEM TO BE SOLVED: To obtain a large high quality single crystal by growing a single crystal at a specified growing rate in such a manner that the melting zone compsn. of rhenium diboride has a specified B/Re atomic ratio. SOLUTION: A rhenium diboride powder and a boron powder are mixed in a specified ratio, compacted by a rubber press and heated to sinter in an inert gas atmosphere at 1,600 to 2,000 deg.C to obtain a source sintered rod having >=60% relative density. Then the chamber of a single crystal growing device by floating zone method is prepared as a He gas atmosphere of 2 to 15atm, and the source sintered rod is set to the upper holder, while a seed crystal or sintered rod to form the initial melting zone is set to the lower holder. Then the source sintered rod is joined to the sintered rod to form the initial zone, and the joined part is heated by induction by a work coil to form a melting zone having 1.9 to 2.4 B/Re atomic ratio (66 to 70 atomic % of B). The upper and lower axes are moved downward while rotated at 0.3 to 3cm/hour growing rate to glow the crystal to obtain a large single crystal.