Abstract
A novel microscopy is developed for evaluating the fracture toughness of thin ceramic sheets using the micro‐indentation method. This microscopy overcomes the theoretical limit of measurement resolution associated with optical microscopes. Using a modified optical microscope, the crack lengths produced by micro‐indentation on the surface of an as‐fired ceramic sheet can now be measured. Experimental results on an 8 mol% yttria‐stabilized zirconia ceramic substrate show that the accuracy of the fracture toughness evaluation is satisfactory. This micro‐indentation fracture toughness evaluation method is efficient and economical for thin ceramic substrate surfaces, either polished or as‐fired.
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