Effects of MAR-M247 substrate (modified) composition on coating oxidation coating/substrate interdiffusion. M. S. Thesis. Final report

Technical Report · Fri Feb 01 00:00:00 EST 1985

OSTI ID:5679517

Pilsner, B H

The effects of ..gamma..+..gamma..' Mar-M247 substrate composition on ..gamma..+..beta.. Ni-Cr-Al-Zr coating oxidation and coating/substrate interdiffusion were evaluated. These results were also compared to a prior study for a Ni-Cr-Al-Zr coated gamma Ni-Cr-Al substrate with equivalent Al and Cr atomic percentages. Cyclic oxidation behavior at 1130 C was investigated using change in weight curves. Concentration/distance profiles were measured for Al, Cr, Co, W, and Ta. The surface oxides were examined by x-ray diffraction and scanning electron microscopy. The results indicate that variations of Ta and C concentrations in the substrate do not affect oxidation resistance, while additions of grain boundary strengthening elements (Zr, Hf, B) increase oxidation resistance. In addition, the results indicate that oxidation phenomena in gamma+beta/gamma+gamma Mar-M247 systems have similar characteristics to the l gamma+beta/gamma Ni-Cr-Al system.

• Research Organization: Michigan Technological Univ., Houghton (USA)
• OSTI ID: 5679517
• Report Number(s): N-85-19073; NASA-CR-174851
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
PROTECTIVE COATINGS
OXIDATION
TANTALUM ALLOYS
DIFFUSION
GAS TURBINE ENGINES
GRAIN BOUNDARIES
MICROSTRUCTURE
SUBSTRATES
VERY HIGH TEMPERATURE
ALLOYS
CHEMICAL REACTIONS
COATINGS
CRYSTAL STRUCTURE
ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
360105* - Metals & Alloys- Corrosion & Erosion