POLYCRYSTALLINE TUNGSTEN, TUNGSTEN ALLOY SINTERED COMPACT, AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2016/152780

A1

A starting material powder comprising particles of W, or a starting material powder blended from a powder of W particles and one or more powders of alloy component particles selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and Mn, or a powder compact molded body thereof, is charged into a pressure sintering apparatus, and while applying pressure of 2.55-13 GPa, is sintered in a temperature range of 1,200°C to the melting point, to obtain a polycrystalline W sinter or polycrystalline W alloy sinter of high density and devoid of anisotropy of the microstructure, having relative density of 99% or greater, and a pore area of 0.2 area% or less, an average crystal grain diameter of 50 μm or less, and an average aspect ratio of crystal grains of 1-2.5, as measured in any cross section of the sintered compact.

WO/2021/039828	SILICON OXIDE-COATED FE-BASED SOFT MAGNETIC POWDER, AND METHOD FOR MANUFACTURING SAME
JP2002146406	LUBRICANT FOR WARM COMPACTING AND POWDERY MIXTURE FOR WARM COMPACTING
JPS6350435	MANUFACTURE OF TOUGH TITANIUM-BASE SINTERED HARD ALLOY

AKHMADI EKO WARDOYO (JP)
MATSUO TOSHIHIKO (JP)
SAKURAZAWA CHIHIRO (JP)
MATSUMOTO SHOTARO (JP)

PCT/JP2016/058713

September 29, 2016

March 18, 2016

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MITSUBISHI MATERIALS CORP (JP)

B22F1/00; B22F3/14; C22C1/04; C22C27/02; C22C27/04; C22C30/00; C22C14/00; C22C16/00; C22C27/06; C22C28/00

WO2009147900A1	2009-12-10
WO2012042791A1	2012-04-05

JPS5362709A	1978-06-05
JP2003193111A	2003-07-09
JP2005307235A	2005-11-04
JP2015221935A	2015-12-10
JP2016049562A	2016-04-11

See also references of EP 3275573A4

SHIGA Masatake et al. (JP)
Masatake Shiga (JP)

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