SURFACE ALLOYED HIGH TEMPERATURE ALLOYS

WIPO Patent Application WO2001090441

A3

There is provided a surface alloyed component which comprises a base alloy with a diffusion barrier layer enriched in silicon and chromium being provided adjacent thereto. An enrichment pool layer is created adjacent the diffusion barrier and contains silicon and chromium and optionally titanium or aluminum. The method comprises depositing a surface alloy on the base alloy at a temperature in the range of 400 to 1000 DEG C and heat treating the surface alloy at a ramp temperature rate of at least 5 DEG C/minute, preferably 10 to 20 DEG C/minute, to a desired maximum temperature at which the surface alloyed component is maintained for a time sufficient to provide the enrichment pool or the enrichment pool with a diffusion barrier layer. A reactive gas treatment may be used to generate a replenishable protective oxide scale of alumina or chromia on the outermost surface of the surface alloyed component.

WYSIEKIERSKI ANDREW GEORGE (CA)
FISHER GARY ANTHONY (GB)
PETRONE SABINO STEVEN ANTHONY (CA)
MANDYAM RADHAKRISHNA CHAKRAVAR (US)

PCT/CA2001/000755

August 08, 2002

May 24, 2001

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SURFACE ENGINEERED PRODUCTS CO (CA)
WYSIEKIERSKI ANDREW GEORGE (CA)
FISHER GARY ANTHONY (GB)
PETRONE SABINO STEVEN ANTHONY (CA)
MANDYAM RADHAKRISHNA CHAKRAVAR (US)

C22C1/00; C10G9/20; C23C4/18; C23C10/52; C23C12/02; C23C14/14; C23C16/06; C23C26/00; C23C30/00; (IPC1-7): C23C26/00; C10G9/16; C23C4/18; C23C10/52

WO1997041275A1	1997-11-06
WO1999014400A1	1999-03-25
WO2000050663A1	2000-08-31

EP0956373A1	1999-11-17
US5873951A	1999-02-23
US5807613A	1998-09-15
US4937042A	1990-06-26
US4468308A	1984-08-28
DE19607979A1	1997-09-04
US5795659A	1998-08-18
GB2066696A	1981-07-15

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