This paper presents the micro-shot peening of zirconia (ZrO2)-advanced ceramics applicable for bio-medical, dental, automotive and aerospace sectors. A ZrO2-advanced ceramic was micro-shot blasted with selected parameters as a first-step investigation focused on the topography, microstructure, surface hardness and the surface fracture toughness (KIc) characteristics. A new technique of micro-blasting was conducted using a portable shot blaster. A white-light interferometer, scanning electron microscopy and Vickers indentation technique were employed for the analysis. This was followed by determining the KIc using an empirical equation. Surface roughness was improved by 34 % after micro-shot blasting treatment. No surface cracking was present which generally exists due to the brittle nature of the ceramic. The hardness, however, reduced by 5.6 % with a reduction in the Vickers crack length of 9 %. This improved the KIc by 3 % when comparing the micro-shot peened surface to the original, as-received surface. It is difficult to conclude if the ZrO2-advanced ceramic has undergone plastic deformation and the movement of dislocations increased to strengthen the ZrO2 ceramic at this stage. However, based on the results, it can be predicted that a level of surface compression was induced beneath the micro-shot peened layer as indicated from the result of the surface topography and integrity. This would justify the hardness modification and the enhancement in KIc.
Bibliographical notePublisher Statement: The final publication is available at Springer via http://dx.doi.org/10.1007/s10853-014-8734-x
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering