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Yin Sheng. ZrO2 PARTICLE GROWTH MECHANISM AND TOUGHENING MECHANISM OF ZrO2/β″-Al2O3[J]. Powder Metallurgy Technology, 1990, 8(2): 66-74.
Citation: Yin Sheng. ZrO2 PARTICLE GROWTH MECHANISM AND TOUGHENING MECHANISM OF ZrO2/β″-Al2O3[J]. Powder Metallurgy Technology, 1990, 8(2): 66-74.
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ZrO2 PARTICLE GROWTH MECHANISM AND TOUGHENING MECHANISM OF ZrO2/β″-Al2O3

  • University of Science and Technology Beijing

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  • This paper discusses the particle growth mechanism of intergranular ZrO2 particles of t-ZrO2/β″-Al2O3 and the toughening mechanism of ZrO2 of c-ZrO2/β″-Al2O3 composites and of t-ZrO2/β″-Al2O3 composites.Direct particle coalescence was identified as magor growth mechanism but ostwald ripering was also observed to contribute. The coalescence of ZrO2 particles progressed via encounter and spheroidization processes. The increase of fracture toughness leads to an increased strength of c-ZrO2/β″-Al2O3 and t-ZrO2/β″-Al2O3. Dispersion toughening is the toughening mechanism of c-ZrO2.
    Stress-induced transformation toughening is the predominant toughening mechanism of t-ZrO2. Dispersion toughening also contributes to the increase of fracture toughness of the t-ZrO/β″-Al2O3.
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