Abstract
In this study, fabrication and mechanical properties of alumina based ceramic matrix nanocomposite reinforced with 15 and 26·6 vol.-%Mo particles were investigated. Alumina–molybdenum nanocomposite powders were prepared by ball milling of Al and MoO3 in an SPEX8000 type ball mill. The powder particles were consolidated by cold uniaxial pressing followed by sintering in vacuum atmosphere at 1300 and 1400°C. The structural evaluation of as milled and sintered samples was studied by X-ray diffraction, differential scanning calorimetry and scanning electron microscopy. Sintered samples were examined by hardness measurements and three-point flexural strength. Results show a significant improvement in flexural strength of Al2O3–Mo nanocomposites in comparison to monolithic alumina and increases by Mo content. During sintering, grain growth and α-Al2O3 to γ-Al2O3 transformation occurred. In addition, an increase in temperature of sintering resulted in higher density and hardness of consolidated nanocomposites.
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