RAPID SINTERING OF POROUS COMPACTS

RAPID SINTERING OF POROUS COMPACTS

1281675 Sintering cemented carbide E I DU PONT DE NEMOURS & CO 24 June 1970 [31 July 1969] 30720/70 Heading C7D Green compacts of 97-75% WC with 3-25% CO and a green density > 30% theoretical are vacuum presintered to between 1100‹C and the eutectic temperature at a heating rate not more than...

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Bibliographische Detailangaben
1. Verfasser: DONG M. CHAY
Format: Patent
Sprache:eng
Schlagworte:
ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Zusammenfassung:1281675 Sintering cemented carbide E I DU PONT DE NEMOURS & CO 24 June 1970 [31 July 1969] 30720/70 Heading C7D Green compacts of 97-75% WC with 3-25% CO and a green density > 30% theoretical are vacuum presintered to between 1100‹C and the eutectic temperature at a heating rate not more than 10‹C/minute. They are the vacuum sintered at temperature T s for not more than 10 minutes and raised to Ts at a rate R s = (1.25M + 45) Œ10‹ C. per minute; where T s = The sintered body is cooled from T s to 800‹ C. in an oxygen free atmosphere in 4-30 minutes. The WC and CO have particle sizes 0.1-2 microns and 0.1-5 microns respectively. The powder mixture has a specific surface area of 1-7 sq. m/gm. and an oxygen content