HVOF and plasma sprayed molybdenum coatings -- microstructure and properties

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:377774

Zimmermann, S; Kreye, H ^[1]

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1. Univ. of the Federal Armed Forces, Hamburg (Germany)

High velocity oxy-fuel (HVOF) and plasma spray experiments were carried out to investigate the oxidation mechanism of molybdenum in the spray process and to determine how the various process parameters affect the microstructure and properties of the coatings. HVOF coatings exhibit their highest hardness and wear resistance at an oxygen content of 6 to 8% by weight. Such an oxygen level can be achieved with Mo and Mo-MoO{sub 2} composite powders as well. In the plasma spray process oxidation of molybdenum is less pronounced and Mo-MoO{sub 2} composite powders containing 6 to 8% oxygen have to be used to obtain similar properties as compared to HVOF-coatings. When Mo-Mo{sub 2}C composite powders are used oxidation of molybdenum becomes greatly reduced and highly wear resistant coatings are obtained at a low hardness level in both spray processes.

• OSTI ID: 377774
• Report Number(s): CONF-9509182--; ISBN 0-87170-541-9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACETYLENE
COMPOSITE MATERIALS
EXPERIMENTAL DATA
FLAME SPRAYING
MECHANICAL PROPERTIES
MELTING
MICROHARDNESS
MICROSTRUCTURE
MOLYBDENUM
MOLYBDENUM CARBIDES
MOLYBDENUM OXIDES
OXIDATION
OXYGEN
PARTICLE SIZE
PLASMA ARC SPRAYING
POWDERS
PROPANE
SCANNING ELECTRON MICROSCOPY
WEAR RESISTANCE