[Evaluation of plasma sprayed crucible coatings for melt processing copper-refractory metal alloys]

Conference · Wed Apr 01 04:00:00 EST 1992

OSTI ID:10132024

A study was made to access the suitability of several plasma arc sprayed coatings applied to graphite for application as containment crucibles for melt processing copper-refractory metal alloys. Coatings of Ta, TaC, TaB{sub 2} and ZrO{sub 2}{center_dot}8w/o Y{sub 2}O{sub 3} were evaluated and compared to uncoated graphite. The ZrO{sub 2}{center_dot}8w/o Y{sub 2}O{sub 3} coating was sprayed over a tungsten bond coat. Prealloyed samples of Cu-15v/o Cr and Cu-15v/o Nb were placed within the crucibles and heated inductively to 1800{degrees}C and 2100{degrees}C, respectively. Compatibility of the coating-alloy system was evaluated by optical and scanning electron microscopy, EDS, XRD and combustion chromatography.

• Research Organization: Ames Lab., IA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 10132024
• Report Number(s): IS-M--698; CONF-9206135--1; ON: DE92008912
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101
360601
CHROMIUM ALLOYS
COPPER BASE ALLOYS
CRUCIBLES
DEFORMATION
GRAPHITE
MELTING
NIOBIUM ALLOYS
PLASMA ARC SPRAYING
POWDERS
PREPARATION AND FABRICATION
PREPARATION AND MANUFACTURE
REFRACTORY METALS
SPRAYED COATINGS
TANTALUM
TANTALUM BORIDES
TANTALUM CARBIDES
ZIRCONIUM OXIDES