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Monday, May 15, 2006 - 2:00 PM
SEAA061.2

HVOF Alternative: Kinetic MetallizationTM WC-Co Coatings

J. A. Henness, R. Tapphorn, H. Gabel, Inovati, Santa Barbara, CA

Kinetic Metallization (KM) allows deposition of fully dense tungsten carbide-cobalt (WC-Co) coatings with tailorable hardness over an expanded range of 700 - 1400HV.  Hardness is functionally related to the concentration of the tungsten carbide in the cobalt matrix, carbide particle size, and carbide grain structure.  The enabling technology is a range of Inovati developed KM WC-Co powders with average carbide particle sizes from <1 to 4-5 micron. As a results of these developments, the National Science Foundation (NSF) awarded Inovati a Phase I Small Business Innovation Research (SBIR) grant to develop nano-grain structured WC-Co.  We anticipate that KM coatings produced with this powder will exhibit hardness of up to 2000HV.  Low temperature Kinetic Metallization is uniquely capable of depositing this powder without decarburization or thermal degradation (i.e. no loss of nano structure). Kinetic Metallization is a low temperature deposition process and offers advantages over the High Velocity OxyFuel (HVOF) thermal spray process including minimal surface pretreatment and no masking.  In addition, no pre, post, or in process thermal management is required.  Along with these technical advantages, KM is 20-30% less expensive than HVOF and safer to operate.


Summary: Kinetic Metallization (KM) allows deposition of fully dense tungsten carbide-cobalt (WC-Co) coatings with tailorable hardness over an expanded range of 700 - 1400HV