Fabrication of Bioactive High Porous Hydroxyapatite Ceramics

Abstract

The main subject of this study was to produce a net shaped micro porous hydroxyapatite ceramics. For this aim, initially fabrication of hydroxyapatite powder was achieved by a thermal extraction method which is inexpensive processing route. Phase determination of the yield of the process was carried out by X-ray diffraction method. Replica technique was used to produce a reticulated structure from hydroxyapatite powder. The foams were produced with various rates of additive as binder and additive-free compositions. After the HAp daubed on surfaces of substrate polymer was fired and sintered in the process at > 1100°C. The obtained ceramic foam was characterized using optical microscopy. The preform exhibited different pore sized structures depending binder rate and sintering temperature. As a result, hydroxyapatite preforms were produced with high porosity and their properties were improved by adding the binder which supports biocompability of HAp.

Keywords

• Hydroxyapatite, bioactive ceramic, ceramic foam, replica method

Gözenekli Biyoaktif Hidroksiapatit Seramiklerinin Üretimi

Abstract

Bu çalışmanın ana konusu, ağ yapılı mikro poroz hidroksiapatit seramiklerinin üretidir. Bu amaçla, ilk olarak hidroksiapatit tozu ekonomik bir üretim prosesi olan termal ekstraksiyon yöntemiyle üretilmiştir. Proses ürünündeki faz dönüşümü X-ray kırınımı metoduyla belirlenmiştir. Hidroksiapatit tozundan ağ yapılı gözenekli malzeme üretmek için Replika tekniği kullanılmıştır. Seramik köpükler, bağlayıcı olarak çeşitli oranlarda katkılar kullanarak veya katkısız kompozisyonlar kullanılarak üretilmiştir. Yüzeylerine HA sıvanmış altlık polimer yakılıp peşinden 1100°C üzerindeki sıcaklıklarda sinterlenmiştir. Elde edilen seramik köpükler optic mikroskopla karakterize edilmiştir. Preformlar, sinterleme sıcaklığı ve bağlayıcı oranına bağlı olarak farklı gözenek büyüklüklü yapılar ortaya koymuştur. Sonuç olarak, hidroksiapatit köpükler, yüksek poroziteli olark üretilmiş ve HAp biyoaktivitesini destekleyen bir bağlayıcı ilavesiyle özellikleri geliştirmiştir.

Keywords

• Hidroksiapatite, biyoaktif seramikler, seramik köpük, replica method

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