Invention Grant
- Patent Title: Molybdenum crucible
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Application No.: US16079733Application Date: 2017-02-23
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Publication No.: US10858759B2Publication Date: 2020-12-08
- Inventor: Makoto Watanabe , Yoshitake Fukaya , Masahiro Katoh , Hidenobu Nishino
- Applicant: A.L.M.T. Corp.
- Applicant Address: JP Tokyo
- Assignee: A.L.M.T. Corp.
- Current Assignee: A.L.M.T. Corp.
- Current Assignee Address: JP Tokyo
- Agency: Baker Botts L.L.P.
- Agent Michael A. Sartori
- Priority: JP2016-035421 20160226
- International Application: PCT/JP2017/006793 WO 20170223
- International Announcement: WO2017/146139 WO 20170831
- Main IPC: C30B35/00
- IPC: C30B35/00 ; C30B29/20 ; C22F1/18 ; F27B14/10 ; F27D1/00 ; C22F1/00 ; B22F5/00 ; B22F3/12 ; C22C1/04

Abstract:
The molybdenum crucible includes a cylindrical side wall and a bottom provided integrally with one end of the side wall. The side wall includes a coarse grain region configured to extend from an outer wall toward an inner wall and a fine grain region configured to extend from the inner wall toward the outer wall so as to be in contact with the coarse grain region. The ratio of the coarse grain region in the side wall in the thickness direction thereof is 10% or more and less than 90%. The coarse grain region is defined as such a region in which crystal grains having a grain size of 1 mm or more determined by an intercept method in the height direction of the crucible occupy 95% or more of an area of a measurement region.
Public/Granted literature
- US20190071793A1 MOLYBDENUM CRUCIBLE Public/Granted day:2019-03-07
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