Accession Number:

ADP011809

Title:

Thermal Sprayed Nanostructured Hard Coatings

Descriptive Note:

Conference proceedings

Corporate Author:

RUTGERS - THE STATE UNIV PISCATAWAY NJCENTER FOR NANOMATERIALS RESEARCH

Personal Author(s):

• Kear, B. H.
• Mayo, W. E.

Report Date:

2000-01-01

Pagination or Media Count:

17.0

Abstract:

Hardcoatings of WC12Co and Al2O313TiO2, produced by High Velocity Oxy-Fuel HVOF and High Energy Plasma HEP spraying, have been investigated. In HVOF spraying, nanostructured WCCo coatings experience more extensive decarburization than conventional coatings, whereas in HEP spraying, just the opposite effect occurs. This is explained in terms of the influence of temperature on the decarburization mechanism. In the Al2O313TiO2 case, HEP spraying generates a metastable coating, due to rapid quenching of the plasma melted particles on the substrate. The metastable phase has a defect spinel structure and a nanocrystalline grain size. When heated, it decomposes into an equilibrium two-phase structure, consisting of alpha-Al2O3 and beta-Al2O3-TiO2. Both nanostructured cermets and ceramics have potential as wear-resistant coatings.

Descriptors:

• *CERAMIC MATERIALS
• *PROTECTIVE COATINGS
• *PLASMA SPRAYING
• *CERMETS
• THERMAL PROPERTIES
• SYMPOSIA
• PLASMAS(PHYSICS)
• GRAIN SIZE
• SUBSTRATES
• EQUILIBRIUM(GENERAL)
• QUENCHING
• HIGH ENERGY
• PARTICLES
• SURFACE PROPERTIES
• HARDNESS
• TWO PHASE FLOW
• METASTABLE STATE
• WORKSHOPS
• WEAR RESISTANCE
• SPINEL
• NANOTECHNOLOGY
• NANOSTRUCTURES

Subject Categories:

• Coatings, Colorants and Finishes

Distribution Statement:

APPROVED FOR PUBLIC RELEASE