Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

Browse

Filters

2021 - 20252

Settings

Author: search.filters.author.Demir, Mustafa M.Publisher: search.filters.publisher.Springer

Search Results

Now showing 1 - 2 of 2
  • Article
    Effect of TiO2 and ZrO2 Additions on Sintering and Mechanical Properties of Dental Porcelain Material
    (Springer, 2025) Aouadja, Faycal; Toprak, Seyra; Demir, Mustafa M.; Boudchicha, Mohamed Redda
    This study investigates the influence of varying TiO2 (0-15 wt.%) and ZrO2 (15-0 wt.%) additions on the microstructure, densification, and mechanical properties of dental porcelain composites fabricated from local Algerian raw materials. The samples were produced by cold compaction and sintered at temperatures ranging from 1100 degrees C to 1250 degrees C. Advanced characterization techniques-X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy-were employed to analyze phase evolution and microstructural morphology. The results indicated that increasing TiO2 content while decreasing ZrO2 enhanced both densification and mechanical strength. The optimal composition-15 wt.% TiO2 sintered at 1200 degrees C-achieved the highest bending strength (177 MPa) and Martens hardness (2931 MPa). TiO2 functioned as a fluxing agent, promoting grain cohesion, whereas excessive ZrO2 content led to the formation of structural defects. These findings highlight the potential of optimized formulations to meet the requirements for high-performance, biocompatible dental ceramics and support the development of sustainable porcelain using abundant natural resources.
  • Article
    Citation - WoS: 5
    Citation - Scopus: 7
    Effect of High Salinity and Temperature on Water-Volcanic Rock Interaction
    (Springer, 2021) Gören, Ayşegül Yağmur; Gören, Ayşegül Yağmur; Topçu, Gökhan; Demir, Mustafa Muammer; Demir, Mustafa M.; Baba, Alper; Baba, Alper
    In order to understand the processes occurring in natural hydrothermal systems, it was carried out a series of water-volcanic rock interaction studies in the laboratory and an intermediate volcanic rock samples from geothermal production wells in Tuzla geothermal field (TGF) in western Turkey. A high-pressure autoclave was used to conduct water-rock interaction experiments under similar conditions of the field. Rainwater and seawater were treated with volcanic rocks at 140 degrees C (reservoir temperature) and 4.5 bar pressure. The change in the ionic content of the resulting fluids was examined in terms of the type of volcanic rocks and mineral saturation index. The results indicate that talc and diopside minerals in geothermal systems may cause scaling at high temperatures depending on the geothermal fluid and pH.