TUNGSTEN BASED SINTERED MATERIAL HAVING HIGH STRENGTH AND HIGH HARDNESS AND MOLD FOR HOT PRESS MOLDING OF OPTICAL GLASS LENS

Title:

TUNGSTEN BASED SINTERED MATERIAL HAVING HIGH STRENGTH AND HIGH HARDNESS AND MOLD FOR HOT PRESS MOLDING OF OPTICAL GLASS LENS

Document Type and Number:

WIPO Patent Application WO/2005/085486

Kind Code:

A1

Abstract:

A W based sintered material which is composed of 0.2 to 1.5 % of Ni and 0.1 to 1 % of Y₂O₃, and optionally, (a) 0.05 to 0.5 % of VC and/or (b) 0.01 to 0.5 % of Co and/or Fe, the balance being W, wherein w phases form a sintering boding with one another and Ni phases or Ni-Co/Fe alloy phases and Y₂O₃phases are dispersed and distributed along boundaries of the above W phases and wherein the above W phase has a maximum particle diameter of 30 μm or less. The above W based sintered material is suitable for use as a mold for the hot press molding of an optical glass lens.

Inventors:

YANG JI-BIN (JP)
OTSUKI MASATO (JP)

Application Number:

PCT/JP2004/010278

Publication Date:

September 15, 2005

Filing Date:

July 13, 2004

Export Citation:

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Assignee:

MITSUBISHI MATERIALS C M I CORP (JP)
YANG JI-BIN (JP)
OTSUKI MASATO (JP)

International Classes:

C03B11/08; C22C27/04; (IPC1-7): C22C27/04

Foreign References:

JPS5341087B1	1978-10-31
JPS647141B2	1989-02-07
JPH06128604A	1994-05-10
JP2001220634A	2001-08-14
JP2004083968A	2004-03-18

Other References: