Characterization of C/C Composites Produced Using 3D-preforms by CVD/CVI Method for Biomedical Applications

Year 2025, Volume: 29 Issue: 1, 39 - 49

Cemalettin Çamyurdu , Şahin Ateş , Kerim Emre Öksüz , Ayşe Şükran Demirkıran

https://doi.org/10.16984/saufenbilder.1492476

Abstract

In this study, carbon/carbon (C/C) composite structures were produced by depositing a pyrolytic carbon matrix around carbon fibers found in a three-dimensional (3D) preform using the Chemical Vapor Infiltration (CVI) method. The preforms used as starting materials were in orthogonal fiber geometry and 3D carbon fiber knitting structure. The CVI process performed in the CVD (Chemical Vapor Deposition) device was carried out at 1250 ℃, under 2 mbar pressure, with a methane gas flow rate of 2.0 lt/min, for a total period of 312 hours gradually applied in an inert atmosphere consisting of argon and nitrogen gases. The produced block piece was processed to obtain small test samples; tensile and three-point bending tests were applied to the pieces, and their densities were measured. Samples were subjected to in-vitro biodegradation tests in 0.9 % isotonic sodium chloride solution by weight at 37 °C for a total of 21 days. The density and apparent porosity of the produced samples were measured to be 1.395 g/cm³ and 13.424%, respectively. The tensile strength and bending strength of the produced C/C composites were determined to be 252.5±6.20 MPa and 236.6±25.7 MPa, respectively. At the end of 21 days, the biodegradation ratio of C/C composites was calculated as 0.0095%.

Keywords

Carbon/Carbon composites, 3D Carbon fibers, Chemical vapor infiltration, Pyrolitic Carbon (PyC), Biodegradation

Biyomedikal Uygulamalar için CVD/CVI Yöntemiyle 3D-Öncüller Kullanılarak Üretilen C/C Kompozitlerin Karakterizasyonu

Abstract

Bu çalışmada, karbon/karbon (C/C) kompozit yapılar, Kimyasal Buhar Sızdırma (CVI) yöntemi kullanılarak üç boyutlu (3D) bir preformda bulunan karbon fiberlerin etrafına pirolitik bir karbon matrisin biriktirilmesiyle üretilmiştir. Başlangıç malzemesi olarak kullanılan preformlar ortogonal fiber geometrisinde ve 3D karbon fiber örgü yapısındaydı. CVD (Kimyasal Buhar Biriktirme) cihazında gerçekleştirilen CVI işlemi 1250 °C'de, 2 mbar basınç altında, 2,0 lt/dk metan gazı akış hızıyla, argon ve azot gazlarından oluşan inert atmosferde kademeli olarak toplam 312 saat süreyle uygulandı. Üretilen blok parça, küçük test numuneleri elde etmek için işlendi; parçalara çekme ve üç nokta eğme testleri uygulandı ve yoğunlukları ölçüldü. Örnekler, ağırlıkça %0,9 izotonik sodyum klorür çözeltisi içinde 37 °C'de toplam 21 gün boyunca in-vitro biyolojik bozunma testlerine tabi tutulmuştur. Üretilen numunelerin yoğunluğu ve görünür gözenekliliği sırasıyla 1.395 g/cm³ ve %13.424 olarak ölçülmüştür. Üretilen C/C kompozitlerin çekme mukavemeti ve eğilme mukavemeti sırasıyla 252,5±6,20 MPa ve 236,6±25,7 MPa olarak belirlenmiştir. 21 günün sonunda C/C kompozitlerin biyolojik bozunma oranı %0,0095 olarak hesaplanmıştır.

Keywords

Karbon/Karbon kompozitler, 3D Karbon fiberler, Kimyasal buhar infiltrasyonu, Pirolitik Karbon (PyC), Biyodegradasyon

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