An improved Cr{sub 3}C{sub 2}-NICHROME powder

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:160435

Hays, C ^[1]; Douglas, R; Sokol, L S ^[2]

---

1. Hays Metallurgical Engineering Corp., Pearland, TX (United States)
2. Miller Thermal Inc., Baytown, TX (United States)

The need for cost effective, wear resistance and corrosion resistant coatings is omnipresent in the oil and gas or petrochemically-related industries. In general, WC-Co powder mixtures are specified but, for the environments of elevated temperature and severe corrosion service, engineers prefer mixtures which contain an (X) amount of chromium carbide dispersed in a matrix of (1-X) NICHROME. Within this singular class of Cr{sub 3}-C{sub 2}-type coatings, a typical choice involves 75% Cr{sub 3}C{sub 2}-25% [80Ni-20Cr]. However, the actual NICHROME composition varies with different blends that range from 10-to-25%. Currently available powders also exhibit a wide variability because of the many different manufacturing methods that are applied. This paper maintains that, if the matrix alloy composition is properly varied and, if the associated chromium carbide content is correctly adjusted, improved results are obtained. For example, erosion resistance is comparable to that for a WC-Co mixture and a uniform microstructure reveals no apparent oxide stringers. Powder is prepared by sintering/crushing to proper size with low iron contents as the end result. Flame spraying has been successful using these spray guns: JET-KOTE II, HV-2000 or GATOR-GARD.

• OSTI ID: 160435
• Report Number(s): CONF-940684--; ISBN 0-87170-509-5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
36 MATERIALS SCIENCE
BULK DENSITY
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CHROMIUM CARBIDES
COMPOSITE MATERIALS
CORROSION RESISTANCE
EROSION
FLAME SPRAYING
METALLOGRAPHY
MICROSTRUCTURE
NATURAL GAS INDUSTRY
NICKEL ALLOYS
PARTICLE SIZE
PETROLEUM INDUSTRY
POWDERS
PROTECTIVE COATINGS
SCANNING ELECTRON MICROSCOPY