Abstract
A novel fast heating thermal shock test (FHTST) was carried out to evaluate the thermal shock behaviour of pressureless sintered β-SiAlON. Molten nonferrous metals, including molten Sn and Al, were used as the heating medium for the FHTST. The retained strength and Vickers crack propagation of the samples after the FHTST were evaluated. For comparison, a quenching thermal shock test (QTST) with room temperature water was also carried out. The differences between the FHTST and QTST for the β-SiAlON ceramic were investigated. For the FHTST with molten metal, the retained strength showed no decrease and Vickers cracks did not propagate with a temperature difference (ΔT) up to 900°C. However, for the QTST with room temperature water, the retained strength reduced sharply at the ΔT larger than 600°C and the indentation cracks propagated significantly. The finite element method (FEM) calculation showed that the differences between FHTST and QTST results could be caused by the different stress status (compressive stress or tensile stress) on the surface. FHTST with molten metal would be a suitable thermal shock evaluating method for the ceramics used in nonferrous metals industry.
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