STABILIZED GRAIN SIZE REFRACTORY METAL POWDER METALLURGY MILL PRODUCTS

WIPO Patent Application WO2003062482

A3

A powder metal (P/M) mill product and the method of fabrication such product made out of low oxygen (<400 ppm) refractory metal, or alloys thereof, using oxide additive (such as MgO, SiO2, and Y2O3) for co-fabrication to achieve refractory metal grain size stabilization as required in high temperature applications. One such product is a sheet with small grain size containing oxide particles as grain size stabilizers. The product has good mechanical properties, low oxygen content in refractory metal fiber derivatives of the powder within the mill product and if is available as large pieces of sheet (lateral dimensions). The metal powder is consolidated to a sheet bar by different methods, which may weigh 50 pounds or more.

AIMONE PAUL R (US)
GOLDBERG HOWARD V (US)
MALEN RICHARD (US)
MORSE THOMAS A (US)
KUMAR PRABHAT (US)
ULENHUT HENNING (US)

PCT/US2003/001823

February 26, 2004

January 21, 2003

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STARCK H C INC (US)
AIMONE PAUL R (US)
GOLDBERG HOWARD V (US)
MALEN RICHARD (US)
MORSE THOMAS A (US)
KUMAR PRABHAT (US)
ULENHUT HENNING (US)

B22F3/10; B22F1/00; B22F1/145; B22F3/20; B22F3/24; C22C32/00; (IPC1-7): C22C32/00

US6261337B1	2001-07-17
US4950327A	1990-08-21

R.F.CHENEY: "Sintering of refractory metals", METALS HANDBOOK, ASM, 9TH ED. VOL. 7, 1984, PAGES 389-393, METALS PARK, OHIO, US, XP002245862

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