Biomedical Engineering Reference
In-Depth Information
6
HydrothermalCrystallizationwith
MicrostructuralSelf-HealingEffecton
MechanicalandFailureBehaviorsofPlasma-
Sprayed
H
ydroxyapatiteCoatings
Chung-WeiYangandTruan-ShengLui
CONTENTS
Introduction ................................................................................................................................. 237
Characteristics of HA Coatings ................................................................................................. 240
Phase Stability of the Crystalline HA Powders.................................................................. 240
Plasma-Sprayed HACs .......................................................................................................... 243
Crystallization of Plasma-Sprayed HACs during Heat Treatments ............................... 248
Hydrothermal Synthesis and Crystallization ......................................................................... 253
Hydrothermal Technology for the HA: Principles and Applications............................. 255
Hydrothermal Crystallization with Self-Healing Effect of Plasma-Sprayed HACs..... 257
Kinetics of Hydrothermal Crystallization under a Saturated Steam Pressure.............. 264
Crystallization Effect on Mechanical Properties of Plasma-Sprayed HACs ...................... 268
Effect of Hydrothermal Crystallization on the Bonding Strength of HACs .................. 269
Erosive Wear Behaviors......................................................................................................... 274
Statistical Evaluation and Reliability Engineering for Biomaterials.................................... 276
Statistical Significance of Data Distribution ....................................................................... 277
The Weibull Distribution Function ...................................................................................... 279
Weibull Model for the Analysis of Failure Behaviors ....................................................... 282
Summary ...................................................................................................................................... 285
References..................................................................................................................................... 286
Introduction
With the same chemical and crystallographic structure as the major inorganic constitu-
inorganic constitu-
ents of human bone, teeth, and hard tissues, hydroxyapatite (Ca
10
(PO
4
)
6
(OH)
2
; HA) is a
widely used calcium phosphate bioceramic, which is considered an excellent bone sub-
major inorganic constitu-
ceramic, which is considered an excellent bone sub-
stitute [1,2] in dentistry and orthopedics because of its favorable bioactive properties and
excellent osteoconductivity [3-5]. Like other calcium phosphate biomaterials, HA is an
osteoconductive biomaterial that allows the formation of bone on its surface by serving as
a scaffold or a template. The advantages for the use of HA include (1) faster stabilization,
rapid fixation, and stronger chemical bonding between the host bone and the implant
used calcium phosphate bioceramic, which is considered an excellent bone sub-
calcium phosphate bioceramic, which is considered an excellent bone sub-
bioceramic, which is considered an excellent bone sub-
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