According to the non-isothermal dynamics theory, the kinetic parameters of each exothermic peak of a low-aluminum Li2O-Al2O3-SiO2 transparent glass-ceramics are calculated by Kissinger method and Ozawa method, including crystallization (phase separation) activation energy E and Avrami index n. The results showed that the activation energy calculated by the two methods was not much different. The phase separation activation energy of the phase separation peak calculated by Kissinger method was 446.66 kJ/mol, and the crystallization activation energy of the first crystallization peak and the second crystallization peak were 320.93 kJ/mol and 255.37 kJ/mol, respectively. The Avrami indexes were 0.73, 3.57 and 1.57, respectively. The phase separation mechanism was the nucleation-growth phase separation of primary nucleation. The crystallization mechanism was the coexistence of two-dimensional growth bulk crystallization and three-dimensional growth bulk crystallization, and the coexistence of surface crystallization and one-dimensional growth body crystallization, respectively.
This study investigated the ultra-thin low-aluminum touch screen produced by the float process, analyzed the effects of air-side silicon coating and the average particle sized of the SiO2 colloidal particles in the coating solution on the chemical tempering warpage value of glass. At the same time, the effects of co-solvent, water consumption and reaction time were studied by controlling variables on the particle size of SiO2 colliods. The results showed that the coating of the air side of the glass can reduce the chemical tempering warpage value, the SiO2 particle size in the coating solution had a linear relationship with the chemical tempering warpage value, and the difference between the predictive value and actual value were 0.59% to 0.63%. Keeping other conditions unchanged, increased the chain length of the alcohol solvent and prolonged the reaction time can increase the SiO2 particle size, while reduced the water consumption can decrease the SiO2 particle size. Therefore, by regulating the particle size of SiO2 in the coating solution, the warpage value of chemical tempered ultra-thin float glass can be effectively predicted and controlled.
Analysis of the drawing process is very important for understanding the drawing behavior of the high performance glass fiber and adjusting the quality of fiber products. A simple quasi-2D mathematical model was established to describe the characteristics of fiber drawing process by applying the principles of fluid dynamics, heat transfer and solved numerically. The above model and calculation method were applied to simulate and calculate boron-free and alkali-free high-performance glass fibers, and to discuss the role of surface tension in drawing process. The effects of the tip radius and temperature and the winder velocity on the fiber size, temperature and velocity were studied. Results showed that surface tension mainly affects the velocity and radius of the fiber in the early stage of drawing process and has little effect on the later stage. When keeping the glass liquid flow rate and drawing speed constant, the lower tip temperature, the thinner the fiber and the faster velocity of fiber in the early stage. When keeping the winder velocity unchanged, the smaller tip radius, the thinner radius of fiber, the faster velocity of fiber. Winder velocity had influential effected on the temperature, velocity and radius of the fiber. When the tip radius, temperature, and flow rate remain unchanged, the faster the winder velocity, the lower the fiber temperature, the thinner the fiber and the faster fiber velocity. With the increasing of winder velocity the final fiber radius decreased. When the winder velocity reaches 50 m/s, the final fiber radius decreased slowly, with the fiber radius of about 2 m. From the point of technical and production efficiency the winder velocity should be controlled under 100 m/s.
Bi2O3-ZnO-B2O3 series lead-free low-melting glass was prepared by high temperature melt-quenching method using quartz glass crucible and corundum crucible under the same conditions. The glass powder of Bi2O3-ZnO-B2O3 series was characterized by X-ray powder diffractometer, Thermal dilatometer, X-ray photoelectron spectroscopy, FTIR spectrometer and Raman spectroscopy. The differences between the Bi2O3-ZnO-B2O3 glass powders melted in quartz glass crucible and corundum crucible were compared, and the effects of two types of crucible materials (quartz glass crucible and corundum crucible) on the properties of the glass were analyzed. The results showed that when preparing bismuthate glass with less SiO2 and Al2O3 or more Bi2O3, using a quartz glass crucible for melting glass with excellent properties and small experimental errors. However, if corundum crucible was used, it will corrode the inner wall of the crucible, leading to the introduction of Al2O3 into the glass melt. While this improved the thermal stability of the glass, it reduced its chemical stability.
Photovoltaic (PV) glass, as an important material in PV module construction, often involves multiple glass suppliers due to the current production characteristics and development level of the industry. When quality issues occur, it is necessary to quickly, accurately, and effectively identify and distinguish the PV glass suppliers. This has become one of the focal points of the industry. Glass supplier information through four direct analysis methods of “module appearance”, “glass performance”, “surface morphology” and “glass composition”, as well as two indirect methods of “production records” and “module power data” were traced and distinguished, listing and comparing the advantages and disadvantages of various methods. In the process of traceability and distinction, it was necessary to balance the relationship between efficiency, accuracy and cost, paid attention to the changes in new industry equipment and cross-field developments, attached importance to cooperation with identification and testing institutions, promptly obtained the latest industry information, focused on operation standardization, and paid attention to the identification characteristics of products. At the same time, it relied on detailed data induction, analysis and deduction, as well as the production quality records of enterprises. The research results have certain guiding significance for the industry's code of conduct and sustainable development.
All-electric glass melting furnaces are widely used in the glass manufacturing industry due to their advantages of environmental protection, small footprint, good operating environment and stable operation. However, there are many safety issues that need to be paid attention to during the operation of the all-electric glass melting furnace, mainly including electric shock, scalding, mechanical injuries, glass lacerations or cuts, and melt leakage accidents. The main safety issues were discussed from the aspects of design, operation and others. And the corresponding precautionary measures and some details were put forward, in order to effectively reduce the safety risks in the operation of the kiln, to protect the safety of personnel and equipment.
In order to produce high quality perfume bottles, a new type radiant tubular metal recuperator was designed for 10 t/d unit glass furnace. After more than 4 years of operation, the furnace and the metal recuperator had been running well. The waste gas heat had been recovered efficiently, which brings good economic benefits to the customer.
Various defects such as surface scratches, over-grinding, under-grinding, pits and others that may occur during the polishing process of ultra-thin electronic glass were investigated and analyzed. The causes of these defects were examined, and improvement measures were proposed. Additionally, future research directions in this area were discussed and anticipated.