Improvement of fracture toughness in dense ATZ composites prepared from zirconia powders with different yttria content

• Autorzy: Grabowy Marek , Delikhovskyi Yurii , Wilk Agnieszka , Pędzich Zbigniew

Warianty tytułu

PL

Poprawa odporności na pękanie gęstych kompozytów ATZ wytworzonych z proszków cyrkonu o różnej zawartości itru

• Języki publikacji: EN

Abstrakty

EN

Alumina toughened zirconia (ATZ) composites with 2.3 vol.% Al₂O₃ (ATZ-B) and 12.3 vol.% Al₂O₃ (ATZ-10) were fabricated. The used starting zirconia powders were prepared as a mixture of powders with different yttria content. The alumina additive was commercially available Al₂O₃ powder. The specific preparation method and optimized sintering conditions allowed us to achieve ATZ products with exceptional properties. These properties were compared with 3Y-TZP sintered samples prepared from commercial powder (Tosoh). The structural and mechanical properties of the investigated ATZ composites were systematically studied. The microstructures were observed by scanning electron microscopy (SEM) on polished and thermally etched surfaces, then the micrographs were binarized and subjected to stereological analysis. Dense (> 99% of relative density), uniform and pore-free microstructures with homogeneously distributed Al₂O₃ inclusions without any visible agglomerates were obtained. The Vickers hardness and Young’s modulus were enhanced according to the rule of mixtures for the composites. The mechanical behaviour was especially oriented towards increasing the fracture toughness. The K_1c parameter reached the extraordinary value of 12.MPa⋅m^1/2 for ATZ-B and 9.8 MPa⋅m^1/2 for ATZ-10. Comparatively, K_1c of the 3Y-TZP reference material was 5.1 MPa⋅m^1/2. The mechanisms contributing to the increase in K_1c were identified to explain the reason for such a large improvement in the fracture toughness. The investigations were particularly focused on crack propagation analysis. The identified mechanisms include crack path deviation and mixed transgranular-intragranular crack migration (crack bridging), crack propagation through the Al₂O₃ grains and frequent changes in the fracture propagation directions of a high angle (close to even 90°). Nevertheless, the occurrence of t→m (tetragonal to monoclinic) transformation of the ZrO₂ phase was considered to be the main toughening factor. Due to the specific method of preparation, leading to an intensification of yttrium diffusion during sintering, the final microstructure revealed very small grains of a tetragonal zirconia phase. These grains exhibited high transformability, which was the main reason for the distinctin crease in fracture toughness.

Słowa kluczowe

EN

ATZ composites; fracture toughness; toughening mechanisms; crack propagation

PL

kompozyty ATZ; odporność na pękanie; mechanizmy hartowania; propagacja pęknięć

• Wydawca: Polskie Towarzystwo Materiałów Kompozytowych
• Czasopismo: Composites Theory and Practice
• Rocznik: 2021
• Tom: R. 21, nr 4
• Strony: 161--168
• Opis fizyczny: Bibliogr. 54 poz., rys., tab.

Twórcy

autor

Grabowy Marek

• IEN Institute of Power Engineering, ul. Mory 8, 01-330 Warsaw, Poland, Ceramic Branch CEREL, ul. Techniczna 1, 36-040 Boguchwała, Poland

autor

Delikhovskyi Yurii

• AGH – University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories al. A. Mickiewicza 30, 30-059 Krakow, Poland

autor

Wilk Agnieszka

• AGH – University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories al. A. Mickiewicza 30, 30-059 Krakow, Poland

autor

Pędzich Zbigniew

• AGH – University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories al. A. Mickiewicza 30, 30-059 Krakow, Poland

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).