Thermal residual stresses near the interface between plasma-sprayed hydroxyapatite coating and titanium substrate: Finite element analysis and synchrotron radiation measurements

被引:16
作者
Cofino, B [1 ]
Fogarassy, P [1 ]
Millet, P [1 ]
Lodini, A [1 ]
机构
[1] Univ Reims, LACM, F-51687 Reims, France
关键词
interface; residual stresses; synchrotron; finite element analysis; hydroxyapatite;
D O I
10.1002/jbm.a.30044
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Plasma-sprayed hydroxyapatite (HA) coatings on titanium alloy are often used in prosthetic implants. The metallic substrate gives the implant good mechanical strength which is combined with good biocompatibility and osteointegration of the ceramic coating. However, the interface between the HA coating and titanium alloy substrate is an area of critical weakness when compared with the interlamellar cohesive strength of the HA coating structure. Knowledge of the stresses in materials near the interface seems to be an important step in understanding why failure occurs. Synchrotron radiation, using Beamline BM16 at the European Synchrotron Radiation Facility (Grenoble, France), has been used to determine local stresses near the interface, down to 10 mum in resolution, between a plasma-sprayed HA coating and a titanium alloy substrate. This experimental determination of residual stresses is compared with the results found by a finite element analysis modeling the thermal effects of the plasma-spraying process. Residual stresses have been found in deposited ceramic near the interface due to a thermal properties mismatch of the materials. If the plane stress state is assumed, meaning the perpendicular component of residual stress is ignored (sigma(z) = 0), then the synchrotron residual stress measurements should be interpreted as mainly compressive in the ceramic coating. This is in contradiction with the coefficient of thermal expansion mismatch; therefore, the simplified plane stresses assumption seems to be inappropriate for the deposited morphology characterized by pores and a network of microcracks. The detailed finite element analysis model, taking into account the real morphology of the coating and the real three-dimensional stress field distribution, allowed the estimation of sigma(z), leading to a more accurate interpretation of synchrotron measurements, which is validated by the experimental results. (C) 2004 Wiley Periodicals, Inc.
引用
收藏
页码:20 / 27
页数:8
相关论文
共 22 条
[1]   RESIDUAL-STRESS MEASUREMENT IN THERMAL SPRAYED HYDROXYAPATITE COATINGS [J].
BROWN, SR ;
TURNER, IG ;
REITER, H .
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE, 1994, 5 (9-10) :756-759
[2]   DENSIFICATION AND STRENGTHENING OF SILVER-REINFORCED HYDROXYAPATITE-MATRIX COMPOSITE PREPARED BY SINTERING [J].
CHAKI, TK ;
WANG, PE .
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE, 1994, 5 (08) :533-542
[3]  
ELSING R, 1990, SURF COAT TECH, V43, P426
[4]  
HASTINGS GW, 1994, BIOCERAMICS, V7, P207
[5]   EFFECT OF SURFACE-ROUGHNESS OF HYDROXYAPATITE-COATED TITANIUM ON THE BONE-IMPLANT INTERFACE SHEAR-STRENGTH [J].
HAYASHI, K ;
INADOME, T ;
TSUMURA, H ;
NAKASHIMA, Y ;
SUGIOKA, Y .
BIOMATERIALS, 1994, 15 (14) :1187-1191
[6]  
HEAD WC, 1995, CLIN ORTHOP RELAT R, P85
[7]  
JARCHO M, 1981, CLIN ORTHOP RELAT R, P259
[8]   Simulation of the thermo-mechanical behavior and residual stresses in the spray coating process [J].
Ju, DY ;
Nishida, M ;
Hanabusa, T .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 1999, 93 :243-250
[9]  
KAY JF, 1990, CRC HDB BIOACTIVE CE, V2, P111
[10]   LONG-TERM IN-VIVO STUDY OF PLASMASPRAYED COATINGS ON TITANIUM-ALLOYS OF TETRACALCIUM PHOSPHATE, HYDROXYAPATITE AND ALPHA-TRICALCIUM PHOSPHATE [J].
KLEIN, CPAT ;
PATKA, P ;
WOLKE, JGC ;
DEBLIECKHOGERVORST, JMA ;
DEGROOT, K .
BIOMATERIALS, 1994, 15 (02) :146-150