Thermal shock behavior of alumina/MoSi2 plasma sprayed laminated composites
- Richard G.
- Rajendra U.
- Daniel
Alumina (Al{sub 2}O{sub 3}) is very susceptible to thermal shock, which leads to strength degradation. By reinforcing Al{sub 2}O{sub 3} with molybdenum disilicide (MoSi{sub 2}) layers, the tolerance to damage caused by thermal shock can be improved. The thermal shock resistance of plasma sprayed Al{sub 2}O{sub 3}/MoSi{sub 2} laminated composites were investigated. Three laminate microstructures having different layer thickness were fabricated by atmospheric plasma spraying while maintaining a 50/50-volume fraction. Quenching experiments done on 4-point bend bars showed a gradual decrease in the strength as the change in temperature ({Delta}T) increased. Thermal shock resistant parameters (R{prime} and R-quadruple prime) provided a representative numerical value of the thermal shock resistance for the laminated composites. The corresponding material properties for the different microstructures were determined experimentally in order to calculate the R{prime} and R quadruple prime values. The intermediate layered composite showed the highest R-quadruple prime va1ue at 1061 {micro}m, while the thin layered composite had the highest R{prime} value at 474 W/m.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 975322
- Report Number(s):
- LA-UR-01-2521; TRN: US201008%%50
- Resource Relation:
- Conference: "Submitted to: 3rd International Symposium on Applied Plamsa Science Conference held in Fairbank, Alaska, July 2-6, 2001".
- Country of Publication:
- United States
- Language:
- English
Similar Records
Molybdenum disilicide composites produced by plasma spraying
Use of plasma spraying in the manufacture of continuously graded and layered/graded molybdenum disilicide/alumina composites