Mold and crucible coatings. Final report, April 1984-December 1985

Technical Report · Mon Apr 28 00:00:00 EDT 1986

OSTI ID:5660650

Canino, S J; Geary, A L

This report details the investigation of coating materials and their application to the graphite crucible and molds used in melting and casting DU-0.75 Ti Alloy. Different types of washes were investigated: zirconium oxide, zirconium silicate, yttrium oxide, titanium carbide ( used as an undercoat), and boron nitride. The parameters investigated in the application of these coatings were number of burnouts of the crucible, method of cleaning, surface condition of the crucible, temperature of the crucible during painting, number and time between coats, and method of drying the crucible. The method of applying the wash affects its adherence to the graphite. The more thorough the drying of the first coat, the more effectively the coating protects the crucible. Drying in still air was detrimental to the success of most washes. Both oven or vacuum drying of the coated crucibles improved the adherence of most washes. Performance of yttrium oxide washes was dependent on the physical properties of the CMC binders. Yttria coating of the molds improved ingot surface quality, compared with zirconia coated or uncoated molds. Generally, zirconium oxide washes outperformed titanium carbide under coated systems and yttrium oxide washes in the elevated temperature tests and in chemistry and ultrasonic results.

• Research Organization: Nuclear Metals, Inc., Concord, MA (USA)
• OSTI ID: 5660650
• Report Number(s): AD-A-167864/8/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CASTING MOLDS
PROTECTIVE COATINGS
CRUCIBLES
DEPLETED URANIUM
MELTING
ADHESION
AIR
BINDERS
BORON NITRIDES
BURNOUT
CHEMISTRY
CLEANING
DRYING
GRAPHITE
HIGH TEMPERATURE
OXIDES
PHYSICAL PROPERTIES
PROJECTILES
SILICATES
TITANIUM ALLOYS
TITANIUM CARBIDES
YTTRIUM OXIDES
ZIRCONIUM
ACTINIDES
ALLOYS
BORON COMPOUNDS
CARBIDES
CARBON
CARBON COMPOUNDS
CHALCOGENIDES
COATINGS
ELEMENTAL MINERALS
ELEMENTS
FLUIDS
GASES
METALS
MINERALS
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PNICTIDES
SILICON COMPOUNDS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
URANIUM
YTTRIUM COMPOUNDS
360205* - Ceramics
Cermets
& Refractories- Corrosion & Erosion
360101 - Metals & Alloys- Preparation & Fabrication