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Comparison of Microstructural and Mechanical Properties of Hydroxyapatite-Al₂O₃ Composites with Commercial Inert Glass (CIG) Addition

100%

Bulut B., Demirkol N., Erkmen Z., Kayali E.

Acta Physica Polonica A

2015

vol. 127

issue 4

1094-1096

Hydroxyapatite (HA) is one of the most widely used biomaterials for orthopedic and dental applications. However, HA is a brittle and weak material and this constrains its orthopedic applications. There are several methods for the improvement of mechanical properties of the HA. One of these methods is to strengthen the HA material by a secondary phase (i.e polymer, metal or ceramics), to make a stronger composite material. Alumina (Al₂O₃) is a bioinert material, which has been widely investigated as a reinforcing agent for HA. The aim of this study is to compare the microstructural and mechanical properties of HA-Al₂O₃ composites with the addition of 5 and 10 wt.% of commercial inert glass (CIG). The grain samples were produced according to BS 7253 at 350 MPa. Then, they were sintered at temperatures between 1000-1300°C for 4 hours. The samples were also analyzed by SEM + EDS to determine microstructural properties, phase analysis was done by X-ray diffractometer (XRD), mechanical properties were measured by compression and hardness tests. Results show that HA-Al₂O₃ composites with addition of 5 and 10 wt.% CIG have reached high density values and high mechanical properties, such as compression strength and hardness at 1300°C. The compression strength and hardness of composites has increased with the increasing CIG content.

The Effect of Mechanical Alloying on the Microhardness and Fracture Toughness of BaTiO_3

76%

Ertuğ B., Çetiner B., Sadullahoğlu G., Gökçe H., Erkmen Z., Öveçoğlu M.

Acta Physica Polonica A

2013

vol. 123

issue 2

188-190

In this work, the effects of mechanical alloying on the mechanical properties of BaTiO_3 were investigated. In order to examine the milling conditions and sintering parameters on the solid state formation of BaTiO_3, X-ray diffraction technique was used. After mechanical alloying process, nanosized powder mixtures were produced. Sintering temperatures were 600, 700, 800, 900, 1000, and 1200C and sintering duration was 1 h. Besides X-ray diffraction examinations, mechanical properties of the BaTiO_3 samples were determined by Vickers microhardness test.

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2 Acta Physica Polonica A

1 2015

1 2013

2 Erkmen Z.

1 Bulut B.

1 Demirkol N.

1 Ertuğ B.

1 Gökçe H.

1 Kayali E.

1 Sadullahoğlu G.

1 Çetiner B.

1 Öveçoğlu M.

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Comparison of Microstructural and Mechanical Properties of Hydroxyapatite-Al₂O₃ Composites with Commercial Inert Glass (CIG) Addition

The Effect of Mechanical Alloying on the Microhardness and Fracture Toughness of BaTiO_3