Titre :	دراسة الخصائص الفيزيائية و النشاط الحيوي للهيدروكسيأباتيت الطبيعي Ca10(PO4)6(OH)2
Type de document :	texte imprimé
Auteurs :	أسماء حرابي ; جامعة قسنطينة, Éditeur scientifique ; عبد الحميد حرابي, Directeur de thèse
Année de publication :	2009
Importance :	100 ورقة
Format :	30 سم
Note générale :	02 نسخ موجودة في مخزن المكتبة المركزية 01 قرص مضغوط
Langues :	Arabe (ara)
Catégories :	Arabe الفيزياء
Tags :	فيزياء المواد:الخزفيات  التلبيد  الهيدروكسيأباتيت  السائل الفيزيولوجي  النشاط الحيوي  hydroxyapatite  sintring  P2O5  B2O3  Bioactivity  SBF  frittage  Bioactivité
Index. décimale :	530 الفيزياء
Résumé :	The main objective of this research is to study the hydroxyapatite (HA: Ca10(PO4)6(OH)2,) which was extracted from cortical bovine. This latter because of both its abundance and high purity may be considered as an exciting starting material for cheap bioceramics production. The effect of various experimental conditions and P2O5 et B203 additions on sintering, microhardness, bioactivity and compatibility of HA have also been taken into account. In order to accomplish the above objectives, many techniques have been used to study and characterize the chemical and physical properties of prepared samples. The most important of them are Scanning Electronic Microscope (SEM), Infra-Red (IR) and X-ray Diffractio (XRD). The first result from this research is the effect of temperature and time of sintering on the properties of HA. Where there was a close correlation between the sintering temperature and mechanical properties of these samples. Indeed, the sintering time has a significant influence on the growth of grains. In addition, the effect of milling time on particle size has not been overlooked. Powders of sub-micron particle sizes have been obtained. The influence of P2O5 and B203 additions on HA properties was also studied. The addition of P2O5 decreased the sintering temperature to a maximum of 1200°C, where the rate of densification of about 93% is obtained for the various additions. As far as micro-hardness is concerned, a value of 5.2 GPa was obtained for 3 wt% P2O5 addition, under the same conditions. This value is much higher than that (2.1 GPa) obtained for samples without additions. A relatively higher tensile strength value of 67 MPa, was measured for samples with 3 wt% P2O5 addition, well above that (13 MPa) of samples without addition and sintered at 1250°C. In the case of the second addition type (B203), it has no positive effect on samples densification. Micro-hardness values of 4.97 and 5.68 GPa were measured for samples with 3 wt% P2O5 addition and sintered at 1250 and 1300°C, respectively. These values are also relatively higher than the 3.4 and 4.7 GPa, measured for samples without additions. Finally, it has also been found that Apatite formation on HA surface during its immersion in "Simulated Body Fluid (SBF), was confirmed. In addition, these samples resisted well to lactic acid (the weight loss ratio was relatively low).
Diplôme :	Magistère
En ligne :	../theses/physique/AHAR2956.pdf
Format de la ressource électronique :	pdf
Permalink :	index.php?lvl=notice_display&id=6617

دراسة الخصائص الفيزيائية و النشاط الحيوي للهيدروكسيأباتيت الطبيعي Ca10(PO4)6(OH)2 [texte imprimé] / أسماء حرابي ; جامعة قسنطينة, Éditeur scientifique ; عبد الحميد حرابي, Directeur de thèse . - 2009 . - 100 ورقة ; 30 سم.
02 نسخ موجودة في مخزن المكتبة المركزية 01 قرص مضغوط
Langues : Arabe (ara)

Catégories :	Arabe الفيزياء
Tags :	فيزياء المواد:الخزفيات  التلبيد  الهيدروكسيأباتيت  السائل الفيزيولوجي  النشاط الحيوي  hydroxyapatite  sintring  P2O5  B2O3  Bioactivity  SBF  frittage  Bioactivité
Index. décimale :	530 الفيزياء
Résumé :	The main objective of this research is to study the hydroxyapatite (HA: Ca10(PO4)6(OH)2,) which was extracted from cortical bovine. This latter because of both its abundance and high purity may be considered as an exciting starting material for cheap bioceramics production. The effect of various experimental conditions and P2O5 et B203 additions on sintering, microhardness, bioactivity and compatibility of HA have also been taken into account. In order to accomplish the above objectives, many techniques have been used to study and characterize the chemical and physical properties of prepared samples. The most important of them are Scanning Electronic Microscope (SEM), Infra-Red (IR) and X-ray Diffractio (XRD). The first result from this research is the effect of temperature and time of sintering on the properties of HA. Where there was a close correlation between the sintering temperature and mechanical properties of these samples. Indeed, the sintering time has a significant influence on the growth of grains. In addition, the effect of milling time on particle size has not been overlooked. Powders of sub-micron particle sizes have been obtained. The influence of P2O5 and B203 additions on HA properties was also studied. The addition of P2O5 decreased the sintering temperature to a maximum of 1200°C, where the rate of densification of about 93% is obtained for the various additions. As far as micro-hardness is concerned, a value of 5.2 GPa was obtained for 3 wt% P2O5 addition, under the same conditions. This value is much higher than that (2.1 GPa) obtained for samples without additions. A relatively higher tensile strength value of 67 MPa, was measured for samples with 3 wt% P2O5 addition, well above that (13 MPa) of samples without addition and sintered at 1250°C. In the case of the second addition type (B203), it has no positive effect on samples densification. Micro-hardness values of 4.97 and 5.68 GPa were measured for samples with 3 wt% P2O5 addition and sintered at 1250 and 1300°C, respectively. These values are also relatively higher than the 3.4 and 4.7 GPa, measured for samples without additions. Finally, it has also been found that Apatite formation on HA surface during its immersion in "Simulated Body Fluid (SBF), was confirmed. In addition, these samples resisted well to lactic acid (the weight loss ratio was relatively low).
Diplôme :	Magistère
En ligne :	../theses/physique/AHAR2956.pdf
Format de la ressource électronique :	pdf
Permalink :	index.php?lvl=notice_display&id=6617