Carbon, a promising material in endoprosthetics. Part 1: the carbon materials and their mechanical properties
| Autor: | K.J. Hüttinger, H. Brückmann |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
Hot Temperature
Materials science Composite number Isotropy Biophysics Reinforced carbon–carbon Modulus Bioengineering In Vitro Techniques Tribology Fatigue limit Carbon Biomechanical Phenomena Biomaterials chemistry.chemical_compound chemistry Flexural strength Mechanics of Materials Ceramics and Composites Silicon carbide Humans Hip Prosthesis Stress Mechanical Composite material |
| Zdroj: | Biomaterials. 1:67-72 |
| ISSN: | 0142-9612 |
| Popis: | Progress in endoprosthetics depends to a large extent on the availability of materials. Carbon is known for its excellent biocompatibility. Carbon materials can also be manufactured with a great variety of properties. The application of carbon materials has been restricted to some special cases like heart valves or tooth roots. Construction of high-loaded endoprosthetic joints has been impossible due to insufficient mechanical strength or manufacturable size of the materials. Three new carbon materials have been developed which seem to offer new possibilities: 1. (1) a high strength Isotropie carbon, 2. (2) a silicon carbide/carbon composite (SiC/C) and 3. (3) a carbon fibre reinforced carbon (CFRC). The mechanical properties of these materials were investigated including size effects (length / to thickness d ratio of samples) and manufactured parameters (final heat treatment temperature, fibre volume content and fibre orientation). Flexural strength of the first two materials, which are both isotropic, increases with decreasing I/d ratio, whereas the CFRC behaves contrarily. In the latter case, failure at low I/dof ratios is caused by shear failure. The Wohler diagram of all three materials demonstrates limits of fatigue even after only 103 to 104 cycles. The fatigue strength of the isotropic C and the SiC/C is between 70 and 80% of the static strength, even in Ringer's solution. The Young's modulus of the isotropic C is comparable to that of femoral bone. The modulus of the SiC/C is still appreciably low. It follows that both isotropic materials are applicable for sliding parts like ball and socket. Their tribological properties are described in a following paper. The CFRC finally combines high fatigue strength (∼ 400 MN/m2) with a moderate Young's modulus (∼ 150 × 103MN/m2). These properties indicate application for shafts and pins. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|