Chemical vapor deposition of tantalum carbide/titanium carbide/aluminum oxide/titanium nitride multilayer coatings on cemented carbide cutting tools
Thesis/Dissertation
·
OSTI ID:7004672
Multi-layered TaC-TiC/Al/sub 2/O/sub 3//TiN coatings were deposited onto mixed cemented carbide (WC-Co-TiC-TaC) cutting tools using chemical vapor deposition in a large, commercial reactor. The variability of microstructure, deposition rate, machining performance, phases present, and adherence with position within the deposition reactor were studied for Al/sub 2/O/sub 3/ deposition temperatures of 915, 1000, and 1035/sup 0/C where coating layers were deposited separately in a discontinuous manner. A continuous deposition of TaC-TiC/Al/sub 2/O/sub 3/ with separate subsequent TiN overlayer deposition was studied also. X-ray diffraction of low-angle-taper sectioned coatings was used to selectively analyze coating and substrate phases present. Phases were similar for all the discontinuously coated inserts with TiN, Al/sub 2/O/sub 3/, TiC, and WC phases positively identified. Auger electron spectroscopy of taper sectioned coatings improved depth resolution by one to two orders of magnitude over conventional SEM/EDS of 90/sup 0/ sections. The interdiffusion between highly adherent coatings and coating/substrate pairs was low with metallic constituents exhibiting diffusion coefficients of the order of 10/sup -17/ cm/sup 2//sec.
- Research Organization:
- Rutgers--the State Univ., New Brunswick, NJ (USA)
- OSTI ID:
- 7004672
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COATINGS
CRYSTAL STRUCTURE
CUTTING TOOLS
DEPOSITION
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
PROTECTIVE COATINGS
REFRACTORY METAL COMPOUNDS
SURFACE COATING
TANTALUM CARBIDES
TANTALUM COMPOUNDS
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TITANIUM NITRIDES
TOOLS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COATINGS
CRYSTAL STRUCTURE
CUTTING TOOLS
DEPOSITION
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
PROTECTIVE COATINGS
REFRACTORY METAL COMPOUNDS
SURFACE COATING
TANTALUM CARBIDES
TANTALUM COMPOUNDS
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TITANIUM NITRIDES
TOOLS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE