| Summary: | 碩士 === 大同大學 === 材料工程學系(所) === 100 === Reticulated porous Al2O3, ZrO2, Al2O3-20%ZrO2 porous oxide ceramics were fabricated by replica method using polyurethane sponge as templates. Polyurethane sponge was fist treated with NaOH solution. Then it was dipped into Al2O3, ZrO2, or Al2O3-20%ZrO2 slurry. Excess slurry was removed either by a preset rollers or by air jet blowing. After drying, the samples were heated to remove PU and binder, followed by 1450℃/2hr sintering.
Slurries of ~30vol% solid content were suitable for coating. The coating amounts were 2.5 cm3 per gram of PU for Al2O3, 2.9cm3 per gram of PU for Al2O3-20vol%ZrO2 slurries. The sintered samples exhibited 0.2MPa for Al2O3 and 0.41MPa for Al2O3-20vol%ZrO2 in compressive strength.
After shape modification of PU struts by heating at 225 ℃, the fabricated Al2O3-20vol%ZrO2 sample could increase its compressive strength to 1.6MPa.
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