Ceramics-Silikáty 58, (2) 99 - 105 (2014) |
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MECHANICAL PROPERTIES OF MACROPOROUS SILICON NITRIDE-BASED CERAMICS DESIGNED FOR BONE SUBSTITUTES
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Bodišová Katarína 1, Kašiarová Monika 2, Vilčeková Zuzana 2,
Domanická Magdaléna 2,
Lenčéš Zoltán 1,
Hnatko Miroslav 1,
Gromošová Silvia 3,
Šajgalík Pavol 1
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1 Institute of Inorganic Chemistry, Slovak Academy of Science,
Dúbravská cesta 9, 842 36 Bratislava, Slovakia
2 Institute of Materials Research, Slovak Academy of Sciences,
Watsonova 47, 04353 Košice, Slovakia
3 Associated Tissue Bank of Faculty of Medicine of P.J. Šafárik University and L. Pasteur Faculty Hospital,
Triedna SNP 1, Košice, Slovakia
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Keywords: Bone substitute, Silicon nitride, Macroporous structure, Mechanical properties
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Porous silicon nitride preforms designed for bone substitutes were prepared by two different forming methods: by introduction
of semolina as pore forming agent and by template method with polyurethane sponge. Silicon nitride-based green bodies were
sintered in air at two different temperatures, while the Si + 20 % Si3N4 samples were sintered by reaction bonding process
in nitrogen. Template method yields samples with interconnected macroporous structure comparable to the bone structure
while introduction of semolina results only in isolated macropores formation. All sintered samples were characterized in
terms of phase composition and microstructure. Moreover, some of the mechanical properties (hardness, elastic modulus,
bending strength) were measured and compared to the bone properties in order to select the most suitable method for the
preparation of trabecular bone substitute. Despite of relatively low strength, the template method with subsequent sintering
in air appeared to be the most promising way for the preparation of trabecular bone-like silicon nitride-based porous
ceramic structures, whereas the hardness and elastic modulus of as prepared samples were in perfect accordance with bone
characteristics. |
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