The mechanical property of advanced ceramics by additive manufacturing through layer-by-layer processing and subsequent sintering has been employed as a key basis for optimizing the processing and developing future application. 3Y-TZP ceramic was fabricated by stereolithography-based additive manufacturing, and the mechanical properties were investigated by nanoindentation and microscratch testing. The microscopic mechanism and evolution of surface deformation and damage induced by scratching were revealed by scanning electron microscopy and surface interferometer. Results showed that the nanoindentation hardness and elastic modulus were comparable to those of conventional process. With the increase in the applied normal load, the scratch-induced damage followed three sequential stages, that is, plastic plowing, microcracking and surface spalling. The magnitude of the microcracks nucleated during scratching depended on the applied normal load. Concerning the homogeneity and integrity with the sintered parts without delaminated cracks and pores, the evolution of surface damage was discussed in different stages. It was concluded that the layer-by-layer process did not affect the characteristic of microcracking evolution. K E Y W O R D S3Y-TZP, additive manufacturing, micro-scratch test, nanoindentation, stereolithography

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