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Khalid, Muhammad Waqas
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article
Microwave hybrid and conventional sintering of Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>/ZrO<sub>2</sub> multilayers fabricated by aqueous tape casting
Abstract
<jats:title>Abstract</jats:title><jats:p>In this study, microwave hybrid sintering and conventional sintering of Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>‐ and Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>/ZrO<jats:sub>2</jats:sub>‐laminated structures fabricated via aqueous tape casting were investigated. A combination of process temperature control rings and thermocouples was used to measure the sample surface temperatures more accurately. Microwave hybrid sintering caused higher densification and resulted in higher hardness in Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>/ZrO<jats:sub>2</jats:sub> than in their conventionally sintered counterparts. The flexural strength of microwave‐hybrid‐sintered Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>/ZrO<jats:sub>2</jats:sub> was 70.9% higher than that of the conventionally sintered composite, despite a lower sintering temperature. The fracture toughness of the microwave‐hybrid‐sintered Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> increased remarkably by 107.8% despite a decrease in the relative density when only 3 wt.% t‐ZrO<jats:sub>2</jats:sub> was added. The fracture toughness of the microwave‐hybrid‐sintered Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>/ZrO<jats:sub>2</jats:sub> was significantly higher (247.7%) than that of the conventionally sintered composite. A higher particle coordination and voids elimination due to the tape casting and the lamination processes, the microwave effect, the stress‐induced martensitic phase transformation, and the grain refinement phenomenon are regarded as the main reasons for the mentioned outcomes.</jats:p>