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RISS 인기검색어
- 검색키워드
- 저자 : Faruk Ozel (검색결과 3 건)
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Abdulkerim Karabulut,Adem Sarilmaz,Faruk Ozel,İkram Orak,Mehmet Akif Şahinkaya 한국물리학회 2020 Current Applied Physics Vol.20 No.1
Cu2NiSnS4 nanorods were synthesized by the usage of hot-injection technique and used as interlayer between the p-Si and Al metal in order to examine their behavior against the temperature and frequency changes. The current-voltage measurements were performed in 80–300 K temperature range with 20 K steps. The X-Ray Diffraction (XRD) was used to prove the crystal structure of the synthesized Cu2NiSnS4 nanorods. Some crucial device parameters such as barrier height, series resistance and ideality factor values were calculated, and the obtained values were compared with other studies in the literature. It has been seen that the calculated parameters of the prepared device are strongly dependent on temperature changes. Besides, the capacitor behavior of fabricated device was investigated depending on the frequency and voltage changes. The experimental results indicated that the prepared device with Cu2NiSnS4 nanorods interlayer could be utilized in the electronic technology, especially applications in wide temperature range.
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Mechanical properties of zirconia after different surface treatments and repeated firings
Ozlem Kara,A. Nilgun Ozturk,Faruk Ozel,Necla Demir,Meryem Gulce Subası 대한치과보철학회 2014 The Journal of Advanced Prosthodontics Vol.6 No.6
PURPOSE This study investigated the influence of surface conditioning procedures and repeated firings on monoclinic content and strength of zirconia before cementation. MATERIALS AND METHODS Sintered bar-shaped zirconia specimens were subjected to no surface treatment (control), air abrasion, or grinding (n=21). Their roughness was evaluated using a profilometer, and microscope analysis was performed on one specimen of each group. Then, 2 or 10 repeated firings (n=10) were executed, the monoclinic content of specimens was analyzed by X-ray diffraction, and a three-point flexural strength test was performed. Surface roughness values were compared using one-way analysis of variance (ANOVA) and Tukey honestly significant difference (HSD) tests, the monoclinic content values were tested using Kruskal-Wallis and Mann-Whitney U tests, and the flexural strength values were tested using two-way ANOVA and Tukey HSD tests (P=.05). Spearman's correlation test was performed to define relationships among measured parameters. RESULTS Surface-treated specimens were rougher than untreated specimens and had a higher monoclinic content (P<.005), and the relationship between roughness and monoclinic content was significant (P<.000). Neither surface treatment nor firing significantly affected the flexural strength, but Weibull analysis showed that for the air-abraded samples the characteristic strength was significantly lower after the 10th firing than after the 2nd firing. CONCLUSION After firing, a negligible amount of monoclinic content remained on the zirconia surfaces, and rougher surfaces had higher monoclinic contents than untreated surfaces. Multiple firings could be performed if necessary, but the fracture probability could increase after multiple firings for rougher surfaces.
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Mechanical properties of zirconia after different surface treatments and repeated firings
Subasi, Meryem Gulce,Demir, Necla,Kara, Ozlem,Ozturk, A. Nilgun,Ozel, Faruk The Korean Academy of Prosthodonitics 2014 The Journal of Advanced Prosthodontics Vol.6 No.6
PURPOSE. This study investigated the influence of surface conditioning procedures and repeated firings on monoclinic content and strength of zirconia before cementation. MATERIALS AND METHODS. Sintered bar-shaped zirconia specimens were subjected to no surface treatment (control), air abrasion, or grinding (n=21). Their roughness was evaluated using a profilometer, and microscope analysis was performed on one specimen of each group. Then, 2 or 10 repeated firings (n=10) were executed, the monoclinic content of specimens was analyzed by X-ray diffraction, and a three-point flexural strength test was performed. Surface roughness values were compared using one-way analysis of variance (ANOVA) and Tukey honestly significant difference (HSD) tests, the monoclinic content values were tested using Kruskal-Wallis and Mann-Whitney U tests, and the flexural strength values were tested using two-way ANOVA and Tukey HSD tests (P=.05). Spearman's correlation test was performed to define relationships among measured parameters. RESULTS. Surface-treated specimens were rougher than untreated specimens and had a higher monoclinic content (P<.005), and the relationship between roughness and monoclinic content was significant (P<.000). Neither surface treatment nor firing significantly affected the flexural strength, but Weibull analysis showed that for the air-abraded samples the characteristic strength was significantly lower after the $10^{th}$ firing than after the $2^{nd}$ firing. CONCLUSION. After firing, a negligible amount of monoclinic content remained on the zirconia surfaces, and rougher surfaces had higher monoclinic contents than untreated surfaces. Multiple firings could be performed if necessary, but the fracture probability could increase after multiple firings for rougher surfaces.
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