Effect of strontium hexaaluminate addition on the damage-tolerance of yttria-stabilized zirconia. Issue 17 (1st December 2017)

• Record Type: Journal Article
• Authors: Gottwik, L.; Wippermann, A.; Kuntz, M.; Denkena, B.
• Is Part Of: Ceramics international. Volume 43:Issue 17(2017)
• Page Start: 15891
• Page End: 15898
• Publication Date: 2017-12-01
• Subjects: Damage tolerance -- Zirconia -- Indentation -- Grinding -- Residual strength; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.08.163
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A detailed and systematic comparison of the residual strength, after indentation and grinding, of three different zirconia-based materials is reported. The materials analyzed were: yttria-stabilized zirconia (Y-TZP "MZ111"), alumina-toughened zirconia (ATZ "TZ-3Y20AB"), and a newly-developed strontium hexaaluminate-toughened zirconia ("HTZ500"). HTZ500 showed higher residual strength after indentation and grinding than the reference materials MZ111 and TZ-3Y20AB. HTZ500 combines an initial strength exceeding 1700 MPa, fracture toughness of 8.6 MPa·√m, and an elastic modulus of 213 GPa. The strain to failure was 1.7 times that of the reference materials. These features make the newly-developed material a desirable alternative to the commonly-used materials Y-TZP and ATZ, for example for use in medical implants. The damage tolerance, in particular, may be attributed to the strengthening mechanisms applied. Beside the phase transformation, the addition of dispersed strontium hexaaluminate platelets into the zirconia microstructure provides a supplementary strengthening mechanism.