Top > Search of International Patents > STISHOVITE SINTERED POLYCRYSTAL AND METHOD FOR PRODUCING SAME

STISHOVITE SINTERED POLYCRYSTAL AND METHOD FOR PRODUCING SAME

Foreign code F130007344
File No. S2011-1127-N0
Posted date May 8, 2013
Country WIPO
International application number 2012JP061806
International publication number WO 2013/054561
Date of international filing May 9, 2012
Date of international publication Apr 18, 2013
Priority data
  • P2011-223844 (Oct 11, 2011) JP
Title STISHOVITE SINTERED POLYCRYSTAL AND METHOD FOR PRODUCING SAME
Abstract

The purpose of the present invention is to provide: a stishovite sintered polycrystal having high hardness and high toughness

and a method for producing the stishovite sintered polycrystal. A stishovite sintered polycrystal can be produced by heating a mass of silicon dioxide glass at 1000 to 1400 DEG C under a pressure of 12 to 16 GPa. The stishovite sintered polycrystal produced in this manner is composed of microcrystals having an average particle diameter of 300 nm or less, and therefore the amount in grain boundaries is increased and microcrystals each having a long and thin shape are penetrated into the sintered polycrystal, whereby the toughness of the stishovite sintered polycrystal is improved. As a result, it becomes possible to produce a highly hard and highly tough stishovite sintered polycrystal having a Vickers hardness of 28 to 29 GPa and a fracture toughness of 10 to 16 MPam1/2.

  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • NATIONAL UNIVERSITY CORPORATION EHIME UNIVERSITY,
  • NISHIYAMA, NORIMASA,
  • IRIFUNE, TETSUO
  • Inventor
  • NISHIYAMA, NORIMASA,
  • IRIFUNE, TETSUO
IPC(International Patent Classification)
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