SIMILARITIES NALYSIS ON HYDROXYAPATITE IRCONIA …
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 – – – 9 9 9 th th th Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Herceg Herceg Herceg Novi, Montenegro, September 10 Novi, Montenegro, September 10 Novi, Montenegro, September 10 - - - 14 14 14 S S IMILARITIES IMILARITIES A A NALYSIS NALYSIS ON ON H H YDROXYAPATITE YDROXYAPATITE - - Z Z IRCONIA IRCONIA C C OMPOSITES OMPOSITES Sorana D. BOLBOACĂ & Lorentz JÄNTSCHI Cluj-Napoca, Romania
Transcript of SIMILARITIES NALYSIS ON HYDROXYAPATITE IRCONIA …
YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
SSIMILARITIES IMILARITIES AANALYSISNALYSIS ONON
HHYDROXYAPATITEYDROXYAPATITE--ZZIRCONIAIRCONIA
CCOMPOSITESOMPOSITES
Sorana D. BOLBOACĂ & Lorentz JÄNTSCHI
Cluj-Napoca, Romania
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
OOUTLINEUTLINE
BackgroundAimMaterial: hidroxyapatite-zirconia compositeMethod: Hierarchical Cluster AnalysisResultsConcluding remarks
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
BBACKGROUNDACKGROUND: H: HYDROXYAPATITEYDROXYAPATITE
Importance:implants materialsdrug delivery systems
Connection with Zirconia dioxide (ZrO2)Reinforcing phases due to its good toughnessWhy? The properties of both materials are combined advantageously
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AAIMIM
To analyze the similar characteristics of hydroxyapatite and three hydroxyapatite-zirconia powders with different phase composition, shape and grains size
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
MATERIAL: HYDROXYAPATITE AND
HYDROXYAPATITE-ZIRCONIA COMPOSITES
HIDROXYAPATITE: HApHIDROXYAPATITE COARSE - GRAINED ZIRCONIA: HAp-CGZHIDROXYAPATITE FINE - GRAINED ZIRCONIA: HAp-FGZHIDROXYAPATITE NEEDLE - GRAINED ZIRCONIA: HAp-NGZSintering temperature: 1150°C, 1200°C, 1250°C & 1300°C
A. Rapacz-Kmita, A. Ślósarczyk and Z. Paszkiewicz: J. Eur. Ceram. Soc. Vol. 26 (2006) p. 1481-1488.
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
MATERIAL: HYDROXYAPATITE AND
HYDROXYAPATITE-ZIRCONIA COMPOSITES1. Vickers hardness = ability to resist to plastic deformation2. Bending strength = upper limit of normal stress at which
fracture or excessive deformation occurs3. Characteristic strength and Weibull modulus =
measurements of the degree of material reliability4. Anisotropy = measurement of the speed of ultrasonic waves
in directions perpendicular and parallel to the axes5. Young modulus = physical property of being inflexible and
hard to bend6. Rigidity modulus = property of being stiff and resistant to
bend7. Poisson ratio = between strain of expansion in the direction
of force and the strain of conc. perpendicular to the force
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
METHOD: HHIERARCHICAL IERARCHICAL CCLUSTER LUSTER AANALYSISNALYSIS
Find relatively homogeneous clusters on cases based on measured characteristicsIdentify the relationship among entities by constructing a hierarchy or tree-look structure based on an ordering conceptSPSS 12.0
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
RRESULTS ESULTS –– PPROXIMITY ROXIMITY MMATRIXATRIX
1250°C - ↓ Poisson ratio, Young modulus, rigidity, Weibull modulus anisotropy –↑ characteristic value
↑ characteristic strength, bending strength, anisotropy, inflexibility and hardness to bend & Vickers hardness
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
The best alikeness:HAp-FGZ & HAp-NGZ (1250°C): ↓ Poisson ratio (0.004), Young’s modulus (0.1 GPa), rigidity (0.2 GPa), Weibull modulus (0.3 MPa), anisotropy (0.37%) & ↑ characteristic value (4 MPa)
The worst alikeness:HAp (1300°C) & HAp-NGZ (1150°C): a value of absolute difference of 45 MPa is obtained for characteristic strength, of 44.7 MPa for bending strength, of 1.47 % for anisotropy, of 8.8 GPa for inflexibility and hardness to bend and of 1.4 GPafor Vickers hardness
RRESULTS ESULTS –– PPROXIMITY ROXIMITY MMATRIXATRIX
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
RRESULTS ESULTS –– IICICLECICLE PPLOTLOT
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RRESULTSESULTS –– DDENDOGRAMENDOGRAM
Poisson ration, anisotropy, stiffness and resistance to bend, plastic deformations and reliability
Poisson ration, stiffness and resistance to bend, abilities to resist to plastic deformations
Poisson ration, stiffness and resistance to bend, inflexibility and hardness to bend
Poisson ration, stiffness and resistance to bend, inflexibility and hardness to bend
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
CCONCLUDING ONCLUDING RREMARKSEMARKS
Hierarchical cluster approach is useful in identification and characterization of similarities of studied hydroxyapatite and hydroxyapatite-zirconiacomposites. Sintering temperature is the most important variable used in clusterization, followed by Poisson ration. Other four parameters (out of nine) with importance in clusterization were Vickers hardness, anisotropy, Young’s modulus and rigidity modulus.
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YUCOMAT 2007 YUCOMAT 2007 YUCOMAT 2007 ––– 999ththth Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, Annual Conference of the Yugoslav Materials Research Society, HercegHercegHerceg Novi, Montenegro, September 10Novi, Montenegro, September 10Novi, Montenegro, September 10---141414
AACKNOWLEDGMENTCKNOWLEDGMENT
The research was partly supported by UEFISCSU Romania through project ET108/2006.
Thank you for your attention!
Sorana D. BOLBOACAhttp://sorana.academicdirect.ro
Lorentz JANTSCHIhttp://lori.academicdirect.org
