glass defects from refractory
Corrosion of AZS Refractories
Abstract. This paper highlights relationship between the composition of defects presented at tableware glass products and a glass phase of the Alumina Zirconia Silicate (AZS) refractory material ...
Analysis of Quality Parameters of Fused Cast AZS …
The problem of glass defects due to exudation and corrosion of fused cast AZS refractories in the working space is especially important for glass-melting …
RHI Magnesita | Glass
Extensive and sophisticated product portfolio that enables the delivery of optimal material solutions, providing for longer tank service lifetimes and low glass defect rates. The portfolio comprises refractory bricks and blocks as well as mixes and mortars from the following material groups: Magnesia and zircon-magnesia
Combined SEM-EDX and μ-Raman spectroscopy for the
Crystalline inclusions, commonly called stones, are very dangerous defects present in industrial glass products. Refractory materials of the furnace, raw materials and ceramic grains introduced with glass cullet, are the main sources of stones. To improve the quality of glass products, the understanding of the mechanisms responsible for the …
Analysis of Defects in Alumina Glass Produced by Full …
Analysis of Alumina Glass Defects. After running a full oxygen combustion float glass furnace for two years, alumina stones and nodules appeared in the glass at a rate of approximately 4-10 per square meter. Eight samples were taken for defect analysis, and their external appearance is shown in Figure 1. 1.Polarized Light Microscope Analysis.
Studying Bubble Glass Defects That Are Cused By Refractory …
Digital Library Publications. Studying Bubble Glass Defects That Are Cused By Refractory Materials. Studying Bubble Glass Defects That Are Cused By Refractory Materials. In this paper, various laboratory measurements will be discussed to determine the best approach for identification of gas bubble defects in glass, with a focus upon those ...
Critical review on blistering models of molten glass in …
The contact between refractories and molten glass is subject to various blistering phenomena: release of gases trapped in the closed porosity of the refractory, reduction of oxides dissolved in the glass by impurities of the refractory, formation of gas bubbles at the glass/refractory interface on sites favorable to the nucleation of gas ...
Studying Bubble Glass Defects that are Caused by Refractory …
Studying Bubble Glass Defects that are Caused by Refractory Materials. Jiri Ullrich, Jiri Ullrich. Search for more papers by this author. Erik Muijsenberg, Erik Muijsenberg. ... 71st Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 32. Related; Information; Close Figure Viewer. Return to …
Refractory Corrosion and Glass Defects
The refractory materials used in glass furnaces are exposed to high temperature and mechanical corrosion during the operation, which results in corrosion of refractories and glass defects.
A New Fused Refractory for Glass Furnace Superstructures
The technological changes underway will likely have a significant impact on the wear exerted on these refractories, thus increasing the risk of glass defects and intensifying the wear on refractory materials that make up the furnace superstructure. One promising solution is the use of a fused cast AZS refractory with a low glassy phase …
TC11: Refractory Materials – ICG | International …
TC11: Refractory Materials. TC11 discuses advanced refractory materials and worldwide industrial experience on glass melting furnaces. The material properties and application problems are reported …
(PDF) Refractory Solutions for the New Challenges in Glass …
rates due to refractory-related glass defects. Su itable a lternatives are ceramic-bonded bricks. RHI's products are optimally developed for such concepts. Citations (2) References (0)
SPECIAL REPORT/GLASS: Identifying Glass Defects
The unusual structure and chemistry of this defect was puzzling, as no refractory or raw material source made sense. The focus of the examination then turned to other ceramic materials used in furnace construction, such as insulation fiber blankets. ... For more information regarding glass defect analysis, contact RHI Monofrax Ltd. at 1870 …
INTERACTION OF MELTED AND CAST REFRACTORIES …
ser, are presented. Refractory corrosion resistance and tendency to form defects in contact with the glass are studied. It is shown that melted and cast corundum-spinelid refractory containing 5% MgO in contact with molten optical glass has good performance characteristics and may be recommended for industrial develop-ment.
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Application Of Refractories In Glass Industry | glassonwebglassonwebRefractories for Glass Industry| High QualityWEBThe corrosion rate of a superstructure refractory is a function of many variables including the continuous attack by high temperatures, unsuitable vapors and particulates. The …
Defects in specialty and container glasses
Alumina enrichment of the glass by an alumina refractory is the source. Figs. 23 and 24 show molybdenum defects in a borosilicate glass; the source is a molybdenum electrode. Fig. 25 displays recrystallized zircon, the devitrification product of a zirconium rich glass; the source of the defect is a zirconia bearing refractory.
Glass Defects Analyses | Glass Service
GS offers analyses of defects in glass & bubble source studies, which include: Defect analysis – bubbles & stones, cords and others such as gall, knots, surface defects. Bubble source identification procedure. Classification of the sources according to mechanism of bubble generation. Bubble features and estimated composition in the product ...
Knots: Analysis and Minimization in High-Quality Glasses
Glass contamination can and does occur from the exudation and corrosion of superstructure and glass contact fusion-cast AZS refractories. This paper documents investigations of real and synthetic knot defects believed to be commonly experienced in TV panel glass production, and highlights the process of identifying the likely source ...
Corrosion of AZS Refractories ‐ Source of Defects in Tableware Glass
This paper highlights relationship between the composition of defects presented at tableware glass products and a glass phase of the Alumina Zirconia Silicate (AZS) refractory material. Furthermore, this study also represents that microstructure of the AZS refractory material located above the metal line differs from the AZS located below …
Furnace start-up defects: AZS exudation or corrosion?
Glass defects, such as knots, cords and scratches, are often attributed to fused cast AZS refractory. The mechanism behind these defect formations is thought to be either run down of viscous ...
Influence of glass composition on high zirconia …
This paper reports mechanisms of corrosion of the refractories used in industrial melting of lead crystal glass hollowware, and some chosen examples of defects linked to this corrosion.
Ruth Engel* discusses the refractories and issues for …
Over time, the refractories have undergone many changes to improve their consistency and quality, address environmental concerns, while at the same time, minimise glass …
GLASS MELTING FURNACE REFRACTORIES AND …
The refractory problems can cause glass defects dur-Journal of Chemical Technology and Metallurgy, 50, 4, 2015 406 ing the campaign. The defects which are determined by the refractory type and their location in furnace listed in Table 3. A troubleshooter should know the furnace opera-
Characterization and identification of local defects in glass
Defects in or on the surface caused by contamination, mechanical, or chemical influences are also called glass defects. Bubbles are hollow spaces within the glass filled with gas. They are one of the most common types of defect. The bubbles contain one or more gases such as oxygen, carbon dioxide, sulfur dioxide, argon, carbon monoxide, and ...
GLASS MELTING FURNACE REFRACTORIES AND …
The refractory problems can cause glass defects dur-Journal of Chemical Technology and Metallurgy, 50, 4, 2015 406 ing the campaign. The defects which are determined by
The solutions for the feeder defects of the glass furnaces
The sintered dense α-Al2O3 forehearth refractory brick made with sintered alumina as the main raw material has excellent properties such as high purity, good compactness, and excellent resistance to molten glass; it can prevent the generation of glass defects and is the ideal fire-resistant refractory brick for the forehearth of the …
AZS fused-cast refractory: different oxidizing methods and …
AZS fused cast refractory changed the very concept of quality and productivity in glass manufacturing. Resistance to corrosion is an intrinsic property of these refractories, but the low potential for defect generation is the result of continuous technological improvement.
GLASS DEFECT DIAGNOSIS (INTRODUCTORY TRAINING)
Examples of defects (from container, tableware and flat glass) will be shown and the participants will be given the chance to analyze the defects themselves. Bubble diagnosis will be explained using case studies. Contents: Explanation of solid defect sources (raw materials, recycling cullet, refractory, melting & fining processes)
REFEL Laboratory – REFEL
The refractory materials in a glass furnace have to resist not only extremely high temperatures, but also the corrosion coming from the glass melt and the furnace atmosphere. ... Through the identification of glass defects REFEL's experts can give comments and recommendations based on their long-term experience regarding …
Studying Bubble Glass Defects that are Caused by …
PDF | bubble glass defects;refractory materials;melting curve;melting temperatures;contamination | Find, read and cite all the research you need on ResearchGate.
(PDF) EXAMINATION OF DEFECTS IN …
Glass melting, liquidus determination techniques, and glass-refractory corrosion testing methods can all be utilized to better define defect sources. Correlations between these laboratory tests ...