Reinforced with Al2O3 fiber and using mullite as the ceramic matrix,Al2O3f/Mullite composites are prepared through an process involving impregnation,drying,pre-sintering,and sintering at sintering temperatures of 600℃,800℃,1 000℃ and 1 200℃ to reveal the effects of different sintering temperatures and holding times under low-temperature pre-sintering conditions on the mechanical properties,dielectric properties,and transparency of the resulting composites.The results show that as the sintering temperature increases,the flexural strength of the composite specimens first increases and then decreases,with the highest flexural strength achieved at a sintering temperature of 1 000℃;specimens sintered at 1 200℃ exhibit brittle fracture characteristics,while those sintered at other temperatures show ductile fracture characteristics.When the composites are prepared at a sintering temperature of 1 000℃,the flexural strength and dielectric constant of the specimens with a holding time of 6 hours are superior to those with a holding time of 2 hours,reaching 45 MPa and 3.2,respectively.
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