UHMWPE/Al2O3-HAp Hibrit Kompozitlerin Üretimi ve Karakterizasyonu

Year 2022, , 887 - 894, 01.06.2022

Gözde Efe , Tuba Yener

https://doi.org/10.2339/politeknik.997061

Abstract

Total Kalça Protezi, kalça ekleminin fonksiyonunu görmediği durumlarda kullanılan ve kalça ekleminin yerini alan, vücuda uyumlu malzemelerden yapılmış implantlardır. Kalça protezlerinde görülen en yaygın hasar, asetabular yuva ve liner parçalarında hareket sırasında zamanla meydana gelen aşınmadan kaynaklanmaktadır. Total kalça protezlerinde en yaygın kullanılan malzeme çifti metalik femur başı üzerine yüksek molekül ağırlıklı polietilen (UHMWPE) yuva ve linerdır. Mevcut çalışmada total kalça protez implantlarının yuva ve liner parçalarının sürtünme ve aşınma dayanımlarının arttırılması hedeflenmiştir. Bu amaçla UHMWPE’e ağırlıkça % 1 , 2 ve 3 oranında biyouyumlu, doğal kemik ile benzer yapıda olan Hidroksiapatit (HAp) tozu ve biyouyumlu, aşınmaya karşı dayanıklı Al2O3 tozu ilave edilmiştir. Santrifüj metodu ile karıştırılan toz karışımları 20mm çapındaki silindirik bir kalıp içerisinde 200°C’ de 1 saat sıcak preslenmiştir. Numunelerin kırık yüzey SEM incelemeleri, takviye elemanlarının UHMWPE matris içerisinde homojen olarak dağıldığını göstermiştir. Takviye elemanlarının varlığı, SEM-EDS ve XRD analizi ile ispatlanmıştır. Kompozitlerin sertlik değerlerinin takviye elemanlarının ilavesi ile 40 MPa dan 66,6 MPa değerine arttığı gözlenmiştir. Kompozit numunelerin ergime sıcaklığının yaklaşık 140 °C olduğu DSC analizi ile belirlenmiştir.

Keywords

Al2O3, HAp (Hidroksiapatit), Hibrit kompozit, Sertlik, Kırık Yüzey, UHMWPE (çok yüksek moleküler ağırlıklı polietilen)

Production and Characterization of UHMWPE- Al2O3-HAp Hybride Composites

Abstract

Total Hip Replacement is implants made of body-compatible materials that are used in cases where the hip joint does not function and replaces the hip joint. The most common damage seen in hip prostheses is due to wear on the acetabular socket and liner parts during movement over time. The most common pair of materials used in total hip replacements is a high molecular weight polyethylene (UHMWPE) socket and liner on the metallic femoral head. In the current study, it was aimed to increase the friction and wear resistance of the socket and liner parts of total hip prosthesis implants. For this purpose, 1, 2 and 3% by weight of biocompatible Hydroxyapatite (HAp) powder, which has a similar structure to natural bone, and biocompatible, wear-resistant Al2O3 were added to UHMWPE. Powder mixtures mixed by centrifugation method were hot pressed at 200°C for 1 hour in a cylindrical mold with a diameter of 20mm. Fractured surface SEM investigations showed that the reinforcement elements were homogeneously dispersed in the UHMWPE matrix. The presence of reinforcement elements has been proven by SEM-EDS and XRD analysis. It was observed that the hardness values of the composites increased from 40 MPa to 66.6 MPa with the addition of reinforcement elements. It was determined by DSC analysis that the melting temperature of the composite samples was approximately 140 °C.

Keywords

UHMWPE (Very High Molecular Weight Polyethylene), α-Al2O3, HAp (Hydroxyapatite), Hybride Composite, Hardness, Fracture Surface

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