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Residual Stress Strengthening in Layered Tricalcium Phosphate (TCP) Bioceramics
E. Hahn1, T. Fey1, K. Zuo2, D.-L. Jiang2, P. Greil1
1 University of Erlangen-Nuremberg, Department of Materials Science (Glass and Ceramics), Erlangen, Germany
2 Shanghai Institute of Ceramics, State Key Laboratory for Engineering Ceramics, Academy of Sciences, Shanghai, China
received February 4, 2011, received in revised form March 18, 2011, accepted March 19, 2011
Vol. 2, No. 2, Pages 133-138 DOI: 10.4416/JCST2011-00005
Abstract
Residual compressive stress formation on the outer surface layers of bioresorbable calcium phosphate multilayer composites was investigated in order to increase their strength. Multilayer laminates of β-Ca3(PO4)2 (TCP) from two different powders were prepared by means of tape casting, laminate pressing, and pressureless sintering. As the laminates cooled from sintering temperature, differences in thermal contraction between the surface layer prepared from a Mg2+-doped β-TCP powder and the core layers caused the generation of surface stresses. The relaxation strain upon removing the surface layer by continuous etching in HNO3 was measured and the distribution of residual stress near the surface was derived. Compressive stresses of approximately 10 MPa were measured, which offer further potential to improve the load-carrying capability of resorbable TZP bioceramics for application in bone defect and trauma treatment.
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Keywords
Calcium phosphate bioceramics, tape-cast laminates, residual stress strengthening
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