Characterization of Hot-Pressed Al2O3 with a Mo-Dispersed Phase.
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS
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Compositions of alumina with a molybdenum-dispersed phase were investigated in the 0 to 5 volume percent Mo range. These compositions were also prepared with a 0.5 weight percent MgO addition. All specimens were fabricated by hot pressing and near theoretical densities were achieved. Specimens were characterized by metallographic and X-ray diffraction analyses, and the microhardness, elastic moduli, tensile strength, and fracture energy were determined. Results revealed that Mo additions did not affect grain growth while in contrast, MgO additions significantly inhibited grain growth. However, Mo additions did reduce the elastic moduli and microhardness, but did not measureably affect the tensile strength. A 50 increase in fracture energy was found in the Al2O3 5 Mo composition compared with Al2O3. In addition, specimens were successfully hot pressed with a microstructure graded from Al2O3 to the 5 Mo composition. Author
- Ceramics, Refractories and Glass