Ceramic Group

Karaj, Iran

Ceramic Group

Karaj, Iran
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Ahmadi Mooghari H.R.,Islamic Azad University at Tehran | Nemati A.,Sharif University of Technology | Eftekhari Yekta B.,Iran University of Science and Technology | Hamnabard Z.,Ceramic Group
Ceramics International | Year: 2012

The effects of SiO 2 and K 2O were investigated on the glass forming ability (GFA) and structural characteristics of CaOTiO 2P 2O 5 system. Differential thermal analyzer (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), FT-IR and 31P magic angle spinning NMR methods were applied for characterizations of the system. Unwanted crystallization in the initial three components base glass composition was observed by adding SiO 2 and crystalline phases such as TiP 2O 7, rutile (TiO 2) and cristobalite (SiO 2) were formed in it. The results showed that K 2O prevents crystallization of glasses and promotes the formation of glass. FT-IR and X-ray diffraction showed that the addition of K 2O caused the formation of phosphate-silicate network as POSi, and formation of isolated droplet phases (rich of Si and P) separated from the phosphate matrix. The optimum amounts of SiO 2 and K 2O in phosphate structure were respectively 6 and 2 wt.%, 0 in accordance with glass forming ability (GFA) parameters. Despite addition of SiO 2 along with K 2O; the 31P MAS NMR and infrared spectrums of glasses show that no Q 2 sites were in the phosphate network. The Q 1 and the pyrophosphate groups was the predominant structural unit in these glasses. © 2011 Elsevier Ltd and Techna Group S.r.l.


Ghasemzadeh M.,Islamic Azad University at Tehran | Nemati A.,Sharif University of Technology | Golikand A.N.,Ceramic Group | Hamnabard Z.,Ceramic Group | Baghshahi S.,Imam Khomeini International University
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2011

Non-isothermal differential thermal analysis (DTA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to study the nucleation and crystallization behavior of mica glass-ceramics with LiF as nucleating agent. The models enabled establishing the kinetic parameters for crystal growth of individual phases. The activation energies for crystal growth were found to be in the range of 161-301 KJ/mol, 416-424 KJ/mol, and 583-1011 KJ/mol for base glasses, samples with substitution of Li 2O for K 2O and samples with addition of LiF, respectively. Formation of transparent glass-ceramics from studied glass-samples has been investigated. Transparency is assumed to occur in the samples with nanocrystalline structure. Copyright © Taylor & Francis Group, LLC.


Ghasemzadeh M.,Islamic Azad University at Tehran | Nemati A.,Sharif University of Technology | Hamnabard Z.,Ceramic Group | Baghshahi S.,Imam Khomeini International University | Golikand A.N.,Ceramic Group
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2012

Effect of NaF on crystallization kinetics, microstructure, and mechanical properties of mica glass ceramics were investigated by the differential thermal analysis (DTA), X-ray diffractometry (XRD), scanning electron microscopy (SEM), and microhardness tests. Non-isothermal DTA experiments showed that the crystallization activation energies of base glasses are changed in the range of 235-246 KJ/mol, while the crystallization activation energies of samples with addition of NaF are changed in the range of 263-367 KJ/mol. The increase of crystallization temperature is helpful for the increase of aspect ratio, and the microstructure of the glass ceramics becomes interconnected, which contributes the improvement of the machinability of the glass ceramics. Microhardness (H v), cutting energy (μ 1), and machinability parameter (m) can be used for estimating the machinability of mica glass ceramics. Transparency in the studied glass samples is assumed to occur due to the presence of crystallites with nano size. © 2012 Copyright Taylor and Francis Group, LLC.


Khalkhali Z.,Iran University of Science and Technology | Hamnabard Z.,Ceramic Group | Eftekhari Yekta B.,Iran University of Science and Technology | Nasiri M.,Iran University of Science and Technology | Khatibi E.,Iran University of Science and Technology
Journal of Materials Engineering and Performance | Year: 2013

Mica-based glasses in the SiO2-Al2O 3-MgO-K2O-F system were prepared by a sintering method to investigate the effects of different amounts of hematite (Fe2O 3) on thermal and sintering behaviors besides machinability of the glasses by means of differential thermal analysis (DTA), X-ray diffraction, and scanning electron microscope techniques. DTA analysis on fine and coarse glass powders indicated that the main crystallization mechanism in this system occurred in the bulk rather than the surface. Increasing Fe2O 3 content to 5 wt.% improved machinability of the glass ceramic. Fe2O3 led to the disruption of the glass matrix and facilitated the nucleation of the crystalline phase. Precipitation of sellite (MgF2) crystals as heterogeneous nucleating sites for potassium phlogopite crystals acted as a second contribution to the machinability of the 5 wt.% Fe2O3-containing sample. However, introducing more than 5 wt.% Fe2O3 to the base glass prohibited the nucleation of MgF2, and as a result, large micas formed within the glass. This together with precipitation of cordierite aggregates in highly doped glass with Fe2O3 led to lower machinability in these samples. © 2012 ASM International.


Heydari F.,Material and Energy Research Center | Maghsoudipour A.,Material and Energy Research Center | Hamnabard Z.,Ceramic Group | Farhangdoust S.,Material and Energy Research Center
Materials Science and Engineering A | Year: 2012

In the present work, barium calcium aluminosilicate glass matrix was reinforced by 10, 15, and 20. vol% nanoparticles of total stabilized zirconia (TSZ). X-ray diffraction and scanning electron microscopy were used to evaluate the microstructure features of the final composites. Mechanical properties of the heat-treated specimens at the SOFC application temperature (800 °C) were determined at ambient temperature for different times (1, 10, 30, 50. h). The obtained results show that mechanical properties were somehow improved in the presence of zirconia nanoparticles. © 2012 Elsevier B.V.


Heydari F.,Material and Energy Research Center | Maghsoudipour A.,Material and Energy Research Center | Hamnabard Z.,Ceramic Group | Farhangdoust S.,Material and Energy Research Center
Journal of Materials Science and Technology | Year: 2013

To develop suitable sealants for intermediate temperature solid oxide fuel cells (IT-SOFC), glass-ceramics based on the CaO-BaO-B2O3-Al2O3-SiO2 system were studied. Coefficient of thermal expansion (CTE), glass transition temperature (Tg) and dilatometric softening point temperature (Td) of specimens were determined by means of dilatometer analysis and crystallization temperature was measured by differential thermal analysis (DTA). Also, crystallization behavior during prolonged heat-treatment and microstructure properties were studied by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Electrical properties were measured at different temperatures, and the results showed a high resistance (>104 Ω) at the SOFC operation temperature (600-800 °C). Moreover, mechanical properties of heat-treated specimens (1, 10, 30, 50 h) were measured. Microstructure investigation revealed a well-adhered bonding between the sealant glass-ceramic electrolyte and glass. © 2013.


Maghsoudipour A.,Material and Energy Research Center | Shabani M.O.,Material and Energy Research Center | Hamnabard Z.,Ceramic Group | Farhangdoust S.,Material and Energy Research Center
Journal of Ceramic Processing Research | Year: 2014

The objective of the present work is to study properties of a composite material consisting of zirconia nanoparticles in a glass matrix based on the system of BaO-CaO-SiO2-B2O3-Al2O3. Zirconia nanoparticles are added by 0-20 vol.% into the glass matrix to prepare the glass composites. Coefficient of thermal expansion, glass transition temperature and dilatometric softening point temperature of specimens are determined by means of dilatometry analysis. Coefficient of thermal expansion of base glass is 10.38 × 10-6 k-1 and by increasing zirconia content to 10, 15, and 20 vol.%, coefficient of thermal expansion reduces down to 9.88 × 10-6, 9.84 × 10-6 and 9.76 × 10-6 k-1 respectively. Sinterability of different specimens is studied by increasing zirconia nanoparticles. Electrical properties are measured in different temperatures, and results show that with increment of zirconia nanoparticles, temperature resistivity of specimens has been decreased. Microstructural investigation reveals a well-adhered bonding between the sealants and electrolyte.


This report studies Glass Ceramics in Global market, especially in North America, Europe, China, Japan, Southeast Asia and India, with production, revenue, consumption, import and export in these regions, from 2011 to 2015, and forecast to 2021. This report focuses on top manufacturers in global market, with production, price, revenue and market share for each manufacturer, covering  Corning  ILVA Glass  NEG  OHARA  Schott  Dongguan Hongtai Glass Products  Far East Cable Co  Hehe Science and Technology Group  Jingniu Glass Ceramic Group  KEDI Glass-ceramic Industrial  Tahsiang By types, the market can be split into  Type I  Type II  Type III By Application, the market can be split into  Housing and construction  Aerospace  Electrical  Medical  Optical By Regions, this report covers (we can add the regions/countries as you want)  United States  EU  Japan  China  India  Southeast Asia 1 Industry Overview of Glass Ceramics  1.1 Definition and Specifications of Glass Ceramics  1.1.1 Definition of Glass Ceramics  1.1.2 Specifications of Glass Ceramics  1.2 Classification of Glass Ceramics  1.2.1 Type I  1.2.2 Type II  1.2.3 Type III  1.3 Applications of Glass Ceramics  1.3.1 Housing and construction  1.3.2 Aerospace  1.3.3 Electrical  1.3.4 Medical  1.3.5 Optical  1.4 Market Segment by Regions  1.4.1 United States  1.4.2 EU  1.4.3 Japan  1.4.4 China  1.4.5 India  1.4.6 Southeast Asia 2 Manufacturing Cost Structure Analysis of Glass Ceramics  2.1 Raw Material and Suppliers  2.2 Manufacturing Cost Structure Analysis of Glass Ceramics  2.3 Manufacturing Process Analysis of Glass Ceramics  2.4 Industry Chain Structure of Glass Ceramics 3 Technical Data and Manufacturing Plants Analysis of Glass Ceramics  3.1 Capacity and Commercial Production Date of Global Glass Ceramics Major Manufacturers in 2015  3.2 Manufacturing Plants Distribution of Global Glass Ceramics Major Manufacturers in 2015  3.3 R&D Status and Technology Source of Global Glass Ceramics Major Manufacturers in 2015  3.4 Raw Materials Sources Analysis of Global Glass Ceramics Major Manufacturers in 2015 4 Global Glass Ceramics Overall Market Overview  4.1 2011-2016E Overall Market Analysis  4.2 Capacity Analysis  4.2.1 2011-2016E Global Glass Ceramics Capacity and Growth Rate Analysis  4.2.2 2015 Glass Ceramics Capacity Analysis (Company Segment)  4.3 Sales Analysis  4.3.1 2011-2016E Global Glass Ceramics Sales and Growth Rate Analysis  4.3.2 2015 Glass Ceramics Sales Analysis (Company Segment)  4.4 Sales Price Analysis  4.4.1 2011-2016E Global Glass Ceramics Sales Price  4.4.2 2015 Glass Ceramics Sales Price Analysis (Company Segment) 8 Major Manufacturers Analysis of Glass Ceramics  8.1 Corning  8.1.1 Company Profile  8.1.2 Product Picture and Specifications  8.1.2.1 Type I  8.1.2.2 Type II  8.1.2.3 Type III  8.1.3 Corning 2015 Glass Ceramics Sales, Ex-factory Price, Revenue, Gross Margin Analysis  8.1.4 Corning 2015 Glass Ceramics Business Region Distribution Analysis  8.2 ILVA Glass  8.2.1 Company Profile  8.2.2 Product Picture and Specifications  8.2.2.1 Type I  8.2.2.2 Type II  8.2.2.3 Type III  8.2.3 ILVA Glass 2015 Glass Ceramics Sales, Ex-factory Price, Revenue, Gross Margin Analysis  8.2.4 ILVA Glass 2015 Glass Ceramics Business Region Distribution Analysis  8.3 NEG  8.3.1 Company Profile  8.3.2 Product Picture and Specifications  8.3.2.1 Type I  8.3.2.2 Type II  8.3.2.3 Type III  8.3.3 NEG 2015 Glass Ceramics Sales, Ex-factory Price, Revenue, Gross Margin Analysis  8.3.4 NEG 2015 Glass Ceramics Business Region Distribution Analysis  8.4 OHARA  8.4.1 Company Profile  8.4.2 Product Picture and Specifications  8.4.2.1 Type I  8.4.2.2 Type II  8.4.2.3 Type III

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