Influence of Carbon Content on the Qualities of Oxy-Fuel Float Glass

2010 ◽  
Vol 156-157 ◽  
pp. 1559-1563
Author(s):  
Xiao Qing Liu ◽  
Jun Lin Xie
Keyword(s):  
Thermal Expansion ◽  
Transition Temperature ◽  
Carbon Content ◽  
Water Content ◽  
Coefficient Of Thermal Expansion ◽  
Softening Temperature ◽  
Float Glass ◽  
Glass Melts ◽  
Glass Softening ◽  
Transition Temperature Increase

To optimize production technology of oxy-fuel float glass, a series of float glass with lower sulphate contents and 1%~5% carbon contents in glass batch were prepared under simulated oxy-fuel melting conditions. Infrared spectroscopy，thermal dilatometer and microscope were used to study water content and its state in glass melts, the change of coefficient of thermal expansion of glass, the glass softening temperature and transition temperature, and the number of bubbles in glass, respectively. The results show that the change of carbon content will slightly changes the water content, thermo properties of glass and the number of bubbles in glass. With the increase of carbon content, the coefficient of thermal expansion and the water content of glass generally decrease, while the number of bubbles, the softening temperature and the glass transition temperature increase. When the content of sulphate is 2%, the glass with 2% carbon content has the biggest water content and the best fining effect.

The Effect of Li2O and B2O3 on Thermal Properties and Chemical Solubility of Low-Fusing Dental Porcelain

2005 ◽  
Vol 284-286 ◽  
pp. 917-920
Author(s):  
Dae Jin Ko ◽  
Kyoung Nam Kim ◽  
Yong Keun Lee ◽  
B.H. Kim ◽  
Kwang Mahn Kim
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Softening Temperature ◽  
Glass Frit ◽  
Dental Porcelain ◽  
Alkali Oxides

Alkali oxides were added to glass frit in order to lower the firing temperature of dental porcelain, and the effects of Li2O and B2O3 on the thermal properties and chemical solubility of low-fusing dental porcelain were investigated. The glass transition temperature(Tg) and softening temperature(Ts) of glass frits were decreased remarkably by adding Li2O, but the coefficient of thermal expansion(CTE) was increased with Li2O. In the case of adding B2O3, the thermal properties were unchanged. Tg of B0L4, B2L4 and B4L4 specimens were lower than 500°C and Ts were lower than 550°C. The chemical solubility of prepared low-fusing dental porcelain with these glass frits were 37.3, 43.9, and 49.2µg·cm-2 respectively. The chemical solubility was increased by adding Li2O and B2O3, but all the results were below 100µg·cm-2 and satisfactory to ISO Standards. Further, the chemical solubility of the commercial low-fusing dental porcelains were 52.6µg·cm-2 for Ceramco Finesse(Clear), 70.8µg·cm-2 for Duceram-LFC(TC) and that of conventional dental porcelain, CeraMax(T-C), was 34.8µg·cm-2.

Highly transparent polyhydroxyimide/TiO2 and ZrO2 hybrid films with high glass transition temperature (Tg) and low coefficient of thermal expansion (CTE) for optoelectronic application

2017 ◽  
Vol 5 (33) ◽  
pp. 8444-8453 ◽  
Author(s):  
Shun-Wen Cheng ◽  
Tzu-Tien Huang ◽  
Chia-Liang Tsai ◽  
Guey-Sheng Liou
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Expansion Coefficient ◽  
Coefficient Of Thermal Expansion ◽  
High Glass Transition Temperature ◽  
Hybrid Films ◽  
Optoelectronic Application ◽  
Low Thermal Expansion

Highly transparent polyhydroxyimide/TiO2 and ZrO2 hybrids films with high glass transition temperature and low thermal expansion coefficient for optoelectronic application.

Properties Investigation of Yb3+-Doped Phosphate Glasses for Fiber Laser

2013 ◽  
Vol 573 ◽  
pp. 31-35
Author(s):  
His Wen Yang ◽  
Jin Ming Zhu ◽  
Yu Xiang Tsai ◽  
Chun Hsiung Lin ◽  
Cheng Hsing Hsu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fluorescence Spectra ◽  
Coefficient Of Thermal Expansion ◽  
Fluorescence Emission ◽  
Softening Temperature ◽  
Chemical Durability ◽  
Phosphate Glasses ◽  
Content Increase ◽  
Glass Softening ◽  
Bridge Oxygen

The physical and optical properties of P2O5-Al2O3-ZnO glasses doped with different concentration of Yb3+ions were investigated. The experimental results indicated that density, chemical durability, glass transition temperature (Tg) and glass softening temperature (Td) of glasses increase with increasing the Yb2O3content of glasses. However, the coefficient of thermal expansion (α) for glasses decrease with increasing the Yb2O3content. From the results of Fourier transform infrared spectroscopy, the numbers of (-P-O-P-) bonds decrease and (-P-O-M+-) bonds increase with increasing the Yb2O3content. Increase of non-bridge oxygen (-P-O-M+-) raise the refractive index of glasses. Moreover, the results of absorption spectra indicate that the absorption peak of glasses are observed at both wavelengths of 916nm and 977nm. As increasing the concentration of Yb2O3, the absorption efficiencies become stronger. In accordance with the results of fluorescence spectra, the fluorescence emission of glasses are detected at wavelengths of 970nm, 995nm, 1020nm and 1048nm, respectively. The intensity of the fluorescence emission peaks significantly decrease at wavelengths of 970nm and 995nm as the concentration of Yb2O3increases. However, the intensity of the fluorescence emission peaks significantly increase at wavelength of 1048nm under the same condition.

Effect of Bi2O3 on Thermal Properties of Barium-Free Glass-Ceramic Sealants in the CaO-MgO-B2O3-Al2O3-SiO2 System

2015 ◽  
Vol 659 ◽  
pp. 180-184 ◽  
Author(s):  
Pornchanok Lawita ◽  
Apirat Theerapapvisetpong ◽  
Sirithan Jiemsirilers
Keyword(s):  
Thermal Expansion ◽  
Thermal Properties ◽  
Thermal Treatment ◽  
Glass Ceramic ◽  
Mechanical Stability ◽  
Coefficient Of Thermal Expansion ◽  
Softening Temperature ◽  
X Ray Diffraction ◽  
Free Glass

Barium-free glass-ceramic sealants for the planar solid oxide fuel cell (pSOFC) have attracted considerable attention to avoid the crystallization of the high coefficient of thermal expansion (CTE) BaCrO4; reaction product at the interface between barium-containing glass-ceramic sealants and Crofer22 APU interconnect, which decreases the long-term mechanical stability of the sealant. In this study, Barium-free glass-ceramic sealants in the CaO-MgO-B2O3-Al2O3-SiO2 system with varying amounts of Bi2O3 from 0 to 10 wt. % were prepared by conventional melting and their thermal properties were investigated. The glass transition temperature (Tg), dilatometric softening temperature, and coefficient of thermal expansion (CTE) were determined by a dilatometer. The Tg, onset of crystallization (Tx) and crystallization temperature (Tc) were obtained from DTA. Results of phase analysis by X–ray diffraction of glasses after thermal treatment at 900 oC for 2 h indicated that the major phase of all glasses was diopside (MgCaSi2O6) and minor phases were åkermanite (Ca2MgSi2O7) and forsterite (Mg2SiO4). The Tg of the fabricated glasses tended to decrease with increasing Bi2O3 content while the CTE of glasses increased after the thermal treatment and was in the range of requirement for SOFC sealant.

Effect of Li2O on Viscosity and Thermal Expansion of Silicate Glass

2011 ◽  
Vol 403-408 ◽  
pp. 70-74
Author(s):  
Kun Yang ◽  
Wei Hong Zheng ◽  
Jin Shu Cheng
Keyword(s):  
Activation Energy ◽  
Thermal Expansion ◽  
Viscous Flow ◽  
Melting Temperature ◽  
Silicate Glass ◽  
Coefficient Of Thermal Expansion ◽  
Viscosity Coefficient ◽  
Soda Lime ◽  
Softening Temperature ◽  
Soda Lime Silicate Glass

Subscript textViscosity, coefficient of thermal expansion, glass transition temperature and dilatometric softening temperature of soda-lime-silicate glass doped with Li2O were investigated by the rotating crucible viscometer and dilatometry, the melting temperature and activation energy for viscous flow of the studied melt were derived on the basis of Arrhenius Equation, in order to reveal the effects of Li2O on the properties of soda-lime-silicate glass. The results showed that the viscosity of soda-lime-silicate glass was effectively decreased and the melting temperature decreased from 1457°C to 1420°C with the increase of Li2O from 0 to 1.0wt%, furthermore, the Tgand Tsreduced 30~40°C. The ΔT responded to the range of viscosity of glass formation (η=103-107Pa•s) increased from 309.84°C to 313.45°C, and the activation energy for viscous flow decreased form 178.47 kJ•mol-1to 168.34 kJ•mol-1. The CTE α(25～400°C)of specimen doped with 0.4% Li2O was 92.048×10-6°C-1and the lowest of the samples.

Investigation of CaSO4-KPO3-Na2B4O7 System as a Basis for Synthesis of Low-Melting Glasses Used as a Glass-Solder Material

2020 ◽  
Vol 989 ◽  
pp. 265-269 ◽  
Author(s):  
Alexey V. Stolbovsky ◽  
Svetlana Murzinova ◽  
Vita Vyatchina
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Softening Temperature ◽  
Glass Formation Region ◽  
Formation Region ◽  
Solder Material ◽  
Concentration Dependences

The possibility of using the compositions of CaSO4-KPO3-Na2B4O7 system as a glass-solder material is shown. A glass formation region has been established in ternary system. The concentration dependences of linear thermal expansion coefficient, the softening temperature and the glass transition temperature are determined and discussed.

Asymmetric bismaleimide-based high-performance resins with improved processability and high Tg over 400 °C

2019 ◽  
Vol 31 (9-10) ◽  
pp. 1132-1139
Author(s):  
Zhidong Ren ◽  
Sijia Hao ◽  
Yue Xing ◽  
Cheng Yang ◽  
Shenglong Dai
Keyword(s):  
Weight Loss ◽  
Thermal Expansion ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
High Performance ◽  
Coefficient Of Thermal Expansion ◽  
Processing Temperature ◽  
The Matrix ◽  
Temperature Window

Asymmetric 2-(4′-maleimido)phenyl-2-(4′-maleimidophenoxyl)phenylbutane (EBA-BMI) was successfully mixed with N, N′-(4,4′-diphenylmethane)bismaleimide (DDM-BMI) to prepare the matrix resins for high-temperature fiber-reinforced polymeric composites (glass transition temperature ( Tg) > 400°C). Experimental results imply that DDM-BMI/EBA-BMI (DE-BMIs) show excellent melting performance with wide processing temperature window and low molten viscosity, suggesting excellent compatibility between DDM-BMI and EBA-BMI. For example, the viscosity of DE-BMI41 (DDM-BMI/EBA-BMI, 4/1) is about 474–51 mPa·s in the temperature range of 148–180 °C. In addition, cured DE-BMIs represent remarkable thermal properties with Tg over 400°C, under which the storage modulus could still reach as high as 3.2 GPa. Meanwhile, the coefficient of thermal expansion of these cured resins is about 36–40 ppm °C−1 at 50–250°C, and the 5% weight loss temperature is about 470°C.

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