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HYDROXYAPATITE COATING ON TITANIUM SUBSTRATE BY ELECTROPHORE

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zeynep aslantürk

on 18 June 2014

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Transcript of HYDROXYAPATITE COATING ON TITANIUM SUBSTRATE BY ELECTROPHORE

HYDROXYAPATITE COATING ON TITANIUM SUBSTRATE BY ELECTROPHORETIC DEPOSITION METHOD

Zeynep ASLANTÜRK
Supervisor: Prof.Dr.Nuran AY

COATING TECHNIQUES
Electrophoretic Deposition

Plasma Spraying
Dip Coating
Sputter coating
Biomimetic coating

WHAT TYPE OF MATERIAL IS HYDROXYAPATITE?
BONE
is consist of three main types;
organıc, inorganic and water.
The inorganic phase is contains HA and HA is created of bone 70% by volume ,50% of bone weight.
Ceramic material

Bioceramics offer many advantages compared to other materials;
More heat and corrosion resistant than metals or polymers
Less dense than most metals and their alloys
Their raw materials are both plentiful and inexpensive

WHY DO YOU NEED FOR HYDROXYAPATITE COATING ON METALLIC IMPLANTS ?
WYH DO YOU CHOOSE Ti AND Ti ALLOYS FOR İNSTEAD OF OTHER METALLIC MATERIALS?

The best biocompatibility of implantation in long life,
Less allergic property,
Less chemical reaction with human tissues
Ligth weigth because of low density
CLASSIFICATION OF BIOMATERIALS
WHAT IS THE BIOMATERIAL?
OUTLINE
OBJECTIVE OF EXPERIMENT
INTRODUCTION

BIOMATERIALS
CLASSIFICATION OF BIOMATERIAL
ELECTROPHORETIC DEPOSITION
COATING TECHNIQUES
PROCESS PARAMETERS IN EPD
EXPERIMENTAL MATERIALS AND METHOD
SUBSTRATE TREATMENT
PREPARATION OF SUSPENSION
ELECTROPHORETIC DEPOSITION
HEAT TREATMENT
CHARACTERIZATION
OPTIMUM PARAMETERS
RESULT AND DISCUSSION
SEM ANALYSIS
XRD ANALYSIS
CONCLUSION
OBJECTIVE OF EXPERIMENT
to achieve hydroxyapatite coating on titanium substrate by EPD and determine the optimum parameters
METALLIC BIOMATERIAL
Stainless steel
Cobalt alloy
Ti and Ti alloy
CERAMIC BIOMATERIAL
Aluminum oxide
Zirconia
Hydroxyapatite
POLYMERIC BIOMATERIAL
Silicons
poly(ethylene)
poly(vinyl chloride)
CONCEQUENTLY; while the corrosion resistance is good of Ti-Ti alloys in use today. Ti-Ti alloys can obtain
allergical reaction in human tissues
because of ions dissolved and being weak in corrosive enviroments
ELECTROPHORETIC DEPOSITION
Cathodic EPD
Positively charged particles in suspension migrate toward the negative electrode.
Anodic EPD
Negatively charged particles in suspension migrate toward the positive electrode.
PROCESS PARAMETERS IN EPD
Particle size
Ph of medium
Zeta potential
Applied voltage and deposition time
Distance between electrode
EXPERIMENTAL METARIALS AND METHOD
SUBSTRATE TREATMENT
Polished
Washed
Passivated
PREPARATION OF SUSPENSION
0.5% HA,1% HA
(Reinforced Polyvyinyl alcohol)
Adherence,
Strenght

Add 80 ml ethanol
Magnetic stirring
Ultrasonic both
ZETA POTENTIAL ANALYSIS
Zeta Potential Analysis as a function of Ph for HA/ Ethanol Suspension
ELECTROPHORETIC DEPOSITION
EPD REQUIREMENTS
Solution Concenration:
0.5% and 1%
Deposition Time:
15-30-60 second
Electrode Distance:
5-10 mm
Deposition Voltage:
100-200-300 V
HEAT TREATMENT
After deposition,the green form coatings were dried at room temperature,and sintered respectively in tube furnace
1000 C-900 C-800 C
for 1 h in argon atmosphere heating rate 1C/min and cooling rate
2 C/min.
0
0
CHARACTERIZATION
HA36:
1000C
0
HA72:
900 C
0
HA108:
800 C
0
60 second-10mm-1%-300V
60 second-10 mm-1%-100 V
HA34:
1000 C
0
HA70:
900 C
0
HA106:
800 C
0
HA37:15s-5mm-
0.5%
-
100V
-900 C
0
0
1000 C
0
HA40:15s-5mm-
1%
-
100V
-900 C
HA40
HA37
HA38:15s-5mm-
0.5%
-
200V
-900 C
HA41:15s-5mm-
1%
-
200V
-900 C
HA38
HA41
HA40
HA76
HA78
HA40:15s-5mm-1%-100V-
900 C
HA76:15s-5mm-1%-
100V
-
800 C
HA78:15s-5mm-1%-
300V
-800 C
1% ACCEPT
ACCEPT 800 C
HA78
HA90
HA102
HA78:
15s
-5mm-1%-300 V-800 C
HA90:
30s
-5mm-1%-300V-800 C
HA102:
60s
-5mm-1%-300V-800 C
HA84
HA96
ACCEPT 30 SECOND
HA108
HA84:
15s
-10mm-1%-300 V
HA96:
30s
-10mm-1%-300V
HA108:
60s
-10mm-1%-300V

ACCEPT 10 mm and 300V
THE OPTIMUM PARAMETERS
Voltage:
300 V
Solution Concentration:
1%
Deposition Time:
30 second
Electrode Distance:
10 mm
Heat Treatment:
800 C

O
RESULT AND DISCUSSION
HA84:
15s
-10mm-1%-300V
HA96:
30s
-10mm-1%-300V
HA108:
60s
-10mm-1%-300V
SURFACE MORPHOLOGY BY SEM
Surface morphology by SEM of coatings obtained %1 HA particle concentration at different deposition time (a) 15 s, (b) 30 s and (c) 60 s during 300 V. The magnification is 10,000x
a
b
c
Surface morphology by SEM of coatings obtained %1 HA particle concentration at different deposition time (a) 15 s, (b) 30 s and (c) 60 s during 300 V. The magnification is 1,000x
a
b
c
XRD ANALYSIS
XRD spectra of coating surface for 300 V 15 s at 800 C sintering, blue circle is used for TiO ,unsigned peaks are HA.
2
The coating thickness as a function of different deposition time at 300 V
Time
Intensity
15
30
60
93
123
327
CONCLUSION
HA coating on titanium substrate using EPD method with the parameters of concentration :1%,deposition time :15 s (instead of 30 s ) ,deposition voltage :300 V,electrode distance :10mm and heat treatment :800C, a crack-free surface was obtained.
If the deposition time is increased,the crack occurrence is increased, but coating thickness is increased with increasing deposition time at 300 V.
THANK YOU FOR LISTENING
INTRODUCTION
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(count)
(sec)
SiC sandpaper
Diamond paste
alumina paste
Detergent and aseton in ultrasonic bath for 30 minutes
with nitric acid
(15 min)
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