Hydroxyapatite reinforced with monocrystalline Al2O3 platelets was densified by hot pressing. The effect of volume fraction and size of platelets on the microstructure, strength and toughness was investigated. It was demonstrated that no phase degradation occured during thermal treatments. A better homogeneity of composite mixtures was achieved when large platelets had been used. In return, the incorporation of small platelets appeared more favourable to increase the mechanical characteristics although limiting effect induced by microstructural defects. The flexural strength can reach 140 MPa with an associated fracture toughness of 2.5 MPa % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaOaaaeaaca% qGTbaaleqaaaaa!36F8!\[\sqrt {\text{m}} \] compared to 137 MPa and 1.2 MPa % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaOaaaeaaca% qGTbaaleqaaaaa!36F8!\[\sqrt {\text{m}} \] for dense monolithic HAP. The observation of crack propagation allowed us to point out the mechanisms responsible of this toughening. Crack deflection on disk faces should be considered as the initiating phenomenon leading to platelet debonding, crack bridging or branching. Crack deflection and branching may also result in the formation of unbroken ligaments of material which bridge the crack.
Similar content being viewed by others
References
L. L. HENCH, J. Amer. Ceram. Soc. 74 [7] (1991) 1487.
G. HEIMKE, Adv. Ceram. Mater. 2 (1987) 764.
D. BERNACHE-ASSOLANT, in “Biomaterials degradation: fundamental aspects and related clinical phenomena”, edited by M. A. BARBOSA (Elsevier Science, Amsterdam, 1991) p. 11.
M. JARCHO, Clin. Orthop. Rel. Res. 157 (1981) 259.
M. HEISE, J. F. OSBORN and F. DUWE, Int. Orthopaedics 14 (1990) 329.
H. OONISHI, Biomaterials 12 (1991) 171.
J. HES and K. De MAN, Int. J. Maxillofac. Surg. 19 (1990) 275.
M. JARCHO, C. H. BOLEN, M. B. THOMAS, J. BOBICK, J. F. KAY and R. H. DOREMUS, J. Mater. Sci. 11 (1976) 2027.
M. B. THOMAS, R. H. DOREMUS, M. JARCHO and R. L. SALSBURY, J. Mater. Sci. 15 (1980) 891.
M. AKAO, H. AOKI and K. KATO, J. Mater. Sci. 16 (1981) 809.
G. de WITH, H. J. A. Van DIJK, N. HATTU and K. PRIJS, J. Mater. Sci. 16 (1981) 1592.
M. AKAO, N. MIURA and H. AOKI, Yogyo Kyokai Shi 92 (1984) 78.
Y. HIRAYAMA, H. IKATA, H. AKIYMA, K. NAGANUMA, S. OJIMA and M. KAWAKAMI, in “Sintering 87”, edited by S. SOMIYA, M. SHIMASA, M. YOSHIMURA and M. WATANABE (Elsevier, New York, 1987) p. 1332.
J. LI and L. HERMANSSON, Interceram 39 (1990) 13.
R. HALOUANI, D. BERNACHE-ASSOLLANT, E. CHAMPION and A. ABABOU, J. Mater. Sci. Mater. Med. 5 (1994) 563.
R. W. RICE, Ceram. Engng. Sci. Proc. 2 (1981) 661.
F. F. LANGE, J. Mater. Sci. 17 (1982) 225.
A. G. EVANS and K. T. FABER, J. Amer. Ceram. Soc. 64 (1981) 394.
K. YAMASHITA, T. KOBAYASHI, T. UMEGAKI and T. KANAZAWA, in “Sintering 87”, edited by S. SOMIYA, M. SHIMASA, M. YOSHIMURA and M. WATANABE (Elsevier, New York, 1987) p. 1320.
J. M. WU and T. S. YEH, J. Mater. Sci. 23 (1988) 3771.
H. JI and P. M. MARQUIS, J. Mater. Sci. 28 (1993) 1941.
T. NOMA, N. SHOJI, S. WADA and T. SUZUKI, J. Ceram. Soc. Jpn. 101 (1993) 923.
K. IOKU, M. YOSHIMURA and S. SOMIYA, Biomaterials 11 (1990) 57.
M. TAKAGI, M. MOCHIDA, N. UCHIDA, K. SAITO and K. UEMATSU, J. Mater. Sci. Mater. Med. 3 (1992) 199.
J. LI, B. FARTASH and L. HERMANSSON, Interceram 39 (1990) 20.
K. T. FABER and A. G. EVANS, Acta Metall. 31 (1983) 565.
N. CLAUSSEN, in “11th Riso international symposium on metallurgy and Material”, edited by J. J. BENTZEN, J. B. BILDESORENSEN and N. CHRISTIANSEN (Riso nat. Lab., Roskilde, Denmark, 1990) p. 1.
G. PEZZOTI, Acta Metall. Mater. 41 (1993) 1825.
J. ZHOU, X. ZHANG, J. CHEN, S. ZENG and K. de GROOT, J. Mater. Sci. Mater. Med. 4 (1993) 83.
K. ISHIKAWA, P. DUCHEYNE and S. RADIN, J. Mater. Sci. Mater. Med. 4 (1993) 165.
R. RAJ and R. K. BORDIA, Acta Metall. 32 (1984) 1003.
D. T. REILLY and A. H. BURSTEIN, J. Bone Jt Surg. 56-A (1974) 1001.
W. BONFIELD and J. C. BEHIRI, in “Application of fracture mechanics to composite materials”, edited by K. FRIEDRICH (Elsevier Science Publishers, Amsterdam, 1989) p. 615.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Champion, E., Gautier, S. & Bernache-Assollant, D. Characterization of hot pressed Al2O3-platelet reinforced hydroxyapatite composites. J Mater Sci: Mater Med 7, 125–130 (1996). https://doi.org/10.1007/BF00058724
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00058724