Autor: Erkmen, Z. E. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigation of Indentation Fracture Toughness (KIC) and Weibull Parameters of 0.25Li2O.2SiO2-0.75BaO.2SiO2 Glass-Ceramic
Autorzy:: Ertuğ, B.
Çetiner, B. R.
Gökçe, H.
Erkmen, Z. E.
Öveçoğlu, M. L.
Powiązania:: https://bibliotekanauki.pl/articles/351907.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: lithium barium silicate glass-ceramic
indentation fracture toughness
hardness
statistical analysis
weibull modulus
Opis:: In the present study, mechanical properties of 0.25Li₂O.2SiO₂-0.75BaO.2SiO₂ glass-ceramic were investigated. The trans-formations‘ temperatures were determined by DTA instrument. The optimum nucleation temperature was found to be 540°C. This suggested the crystallization temperatures as 675, 720 and 800°C. After carrying out crystallization heat treatments, Vickers indentation test was applied. In order to determine the indentation fracture toughness (K_IC), crack half-length ‚c‘ of the samples was measured. To calculate K_IC, Young’s modulus, E and the measured hardness, H_v were used. Using K_IC and probability of fracture ‚P‘, ln ln[1/(1 − P)] – ln K_IC graph was drawn based on the Weibull distribution equation. Consequently, Weibull modulus, ‚m‘ and scale parameter, ‚K₀‘ were determined and compared with each other.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 4; 1963-1968
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Comparison of Microstructural and Mechanical Properties of Hydroxyapatite-Al₂O₃ Composites with Commercial Inert Glass (CIG) Addition
Autorzy:: Bulut, B.
Demirkol, N.
Erkmen, Z.
Kayali, E.
Powiązania:: https://bibliotekanauki.pl/articles/1401291.pdf
Data publikacji:: 2015-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 87.85.J
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2015, 127, 4; 1094-1096
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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