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2020•International Journal of Applied Ceramic TechnologyRequires access

Microstructure and mechanical properties of Al 2 O 3 /ZrO 2 composites by two‐step sintering

Christiane Lago Ojaimi, Julieta Adriana Ferreira, Adilson Luiz Chinelatto, Raphael Euclides Prestes Salem, Adriana Scoton Antônio Chinelatto, Eliria María de Jesus Agnolon Pallone

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Abstract

Abstract Composites of Al 2 O 3 /ZrO 2 (containing 25, 50, and 75 vol% ZrO 2 ) were prepared by mixing Al 2 O 3 and ZrO 2 suspensions. The microstructural control via two‐step sintering (TSS) was the main objective of this work. For this purpose, different sintering curves were constructed, aiming to achieve the best temperature combination for the sintering steps that provides higher density and finer microstructure. The results were compared with single‐step sintering (SSS). Furthermore, microhardness and fracture toughness were measured for the best TSS specimens under each composition. The results showed that the high densities were obtained, and the reduction of grain size was greater than 40% for two‐step sintered specimens, compared to SSS ones. Consequently, microhardness values increased. However, fracture toughness values remained unchanged.

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What this paper is about

Abstract Composites of Al 2 O 3 /ZrO 2 (containing 25, 50, and 75 vol% ZrO 2 ) were prepared by mixing Al 2 O 3 and ZrO 2 suspensions. The microstructural control via two‐step sintering (TSS) was the main objective of this work. For this purpose, different sintering curves were constructed, aiming to achieve the best temperature combination for the sintering steps that provides higher density and finer microstructure. The results were compared with single‐step sintering (SSS). Furthermore, microhardness and fracture toughness were measured for the best TSS specimens under each composition. The results showed that the high densities were obtained, and the reduction of grain size was greater than 40% for two‐step sintered specimens, compared to SSS ones. Consequently, microhardness values increased. However, fracture toughness values remained unchanged.

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Available abstract

Abstract Composites of Al 2 O 3 /ZrO 2 (containing 25, 50, and 75 vol% ZrO 2 ) were prepared by mixing Al 2 O 3 and ZrO 2 suspensions. The microstructural control via two‐step sintering (TSS) was the main objective of this work. For this purpose, different sintering curves were constructed, aiming to achieve the best temperature combination for the sintering steps that provides higher density and finer microstructure. The results were compared with single‐step sintering (SSS). Furthermore, microhardness and fracture toughness were measured for the best TSS specimens under each composition. The results showed that the high densities were obtained, and the reduction of grain size was greater than 40% for two‐step sintered specimens, compared to SSS ones. Consequently, microhardness values increased. However, fracture toughness values remained unchanged.

Key concepts: Materials science, Sintering, Microstructure, Fracture toughness, Indentation hardness, Composite material, Grain size

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