Prediction of the resistance to machining-induced cracking in zirconia by nanoindentation

Alao, Abdur-Rasheed, and Yin, Ling (2014) Prediction of the resistance to machining-induced cracking in zirconia by nanoindentation. In: Recent Advances in Structural Integrity Analysis: Proceedings of the International Congress (APCF/SIF-2014). pp. 580-584. From: APCF/SIF-2014: Asian-Pacific Conference on Fracture and Strength and International Conference on Structural Integrity and Failure, 9-12 December 2014, Sydney, NSW, Australia.

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Zirconia is a unique material widely used in engineering, medicine and dentistry as load-bearing structures. Zirconia structures can be shaped either in pre-sintered or sintered states by abrasive machining. However, abrasive machining inevitably induces surface and sub-surface cracks in both pre-sintered and sintered zirconia materials, resulting in poor surface quality and shortened lifespans of zirconia products. This research was undertaken to predict the resistance to machining-induced cracking for pre-sintered and sintered zirconia in nanoindentation using the Sakai model at a peak load of 10 mN and loading rates of 0.1–2 mN/s. The results show that pre-sintered zirconia yielded higher ductility indices and better resistances to machining-induced cracking than sintered zirconia. Both materials revealed the loading rate-independent resistances to machining-induced cracking. This work suggests that pre-sintered zirconia can sustain more mechanical damage and absorb more energy and therefore can be more easily machined than sintered zirconia.

Item ID: 38541
Item Type: Conference Item (Research - E1)
ISBN: 978-0-08-100203-2
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Funders: James Cook University (JCU)
Date Deposited: 29 Apr 2015 05:34
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091201 Ceramics @ 100%
SEO Codes: 86 MANUFACTURING > 8610 Ceramics, Glass and Industrial Mineral Products > 861002 Ceramics @ 60%
92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920402 Dental Health @ 40%
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