Glass defects can arise for various reasons, such as unmolten raw materials or the extensive use of recycled glass cullet, and result in the occurrence of unsightly and partly dangerous inclusions. Furthermore, also melting conditions and their influence on the refractory materials in the furnace can stimulate glass defects.
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Refractory related glass defects Glass defects occur in many different forms while the defect sources exhibit a considerable diversity. For instance, two defects may have the same structure and character but an origin which comes from different sources and driven by different mechanisms. The glass
Sep 01, 2010· Glass defects are typically unavoidable, but their occurrence must be minimized during the production of high-quality glasses. Common glass defects include bubbles, stones, knots, cords and scratches. One unusual stone defect in a pattern glass was recently discovered, and a scrupulous methodology was necessary to investigate its source.
SOLUBILITY OF GLASS TANK REFRACTORIES INTRODUCTION In the -past few years glass tank operation has been subjected to much serious study in regard to the all important refractory lining of the tank. Economical and efficient operation of a glass tank will depend pri marily upon the composition and the type of the refrac
In this paper the formation of boundary layers and their behaviour regarding corrosion and glass defect potential of different refractory/glass melt combinations will be discussed. The reaction between refractories and glass melts is determined by the diffusion of the different ions from the glass melt into the refractory material and vice versa.
Jun 26, 2015· The interaction of glass melts and refractories in glass furnaces has a large impact on the resulting glass quality. The mostly applied type of refractory in the glass industry, in direct contact with the glass melt, is fused cast AZS. Due to the interaction of the glass melt with fused cast AZS, glass defects like…
Glass defects have a major impact on glassmakers' production cost. When a glass quality crisis occurs, the glassmaker must quickly identify its origin and apply corrective measures. Analyzing the origin of defects requires a vast knowledge of both the various defects' types and refractory …
3. REFRACTORY DEFECTS, QUALITY CONTROL AND NEW POSSIBILITIES [WEDNESDAY 6 TH SEPTEMBER & THURSDAY 7 TH SEPTEMBER] MASSO, FT • How to reduce glass defects generated by fused-cast AZS (Jérôme Canaguier, MASSO) • Latest improvements on feeder refractory expendables (Mathieu Girard, MASSO)
The area inside a glass furnace with potential for defect generation from refractories is large (~ 3600 ft 2 for container furnaces ~ 14000 ft 2 for float furnaces). Batching errors, temperature generated devitrites, and mechanical finishing steps can also contribute to defect generation.
Analysis of a range of solid, gaseous and surface defects and inclusions for all types of glass - from compositional analysis of inclusions, stone, cord, knot, bubbles or blisters to delamination, misting, bloom and assessment of forming defects or quality concerns in finished products.
Refractories. Bucher Emhart Glass refractories are formulated from high purity, special oxide raw materials and manufactured with the properties necessary for the success of each specific glass making operation. In our laboratory, manufacturing, and quality operations, we bring together people, processes, and products to meet your needs.
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Corrosion of glass contact and superstructure refractories is the main reason for formation of undesirable glass defects. Fused cast AZS block is the most widely used refractory in glass contact areas and superstructure. Exudation is thought as the leading cause of knot and cord defects. It is only a short-term cause of glass defects.
Figure 4. SEM image at 200X of glass defect from separation media that was not washed off of the glass prior to tempering. Figure 5. EDS spectrum of deposit shown in figure 4. Figure 6. SEM image at 150X of refractory dust on glass. Figure 7. EDS spectrum of alumino-silicate refractory dust from fiber insulation on the glass as seen in figure 6.
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71st Conference on Glass Problems: A Collection of Papers Presented at the 71st Conference on Glass Problems, The Ohio State University, Columbus, Ohio, October 19-20, 2010, Volume 32, Issue 1 ... Studying Bubble Glass Defects That are Caused by Refractory Materials 67 Jiri Ullrich and Erik Muijsenberg. Analysis of Cord and Stones in Glass 81 ...
Refractories . IMI-NFG Course on Processing of Glass - Lecture 3: Basics of industrial glass melting furnaces [email protected] 5 • Different furnace types and designs exist, depending on the quantity of glass to be produced, the type of glass production, plus economic (and logistic) factors
We are the driving force of the refractory industry. As global refractory leaders, we are in a position to drive positive change in our industry and the industries that rely on us. RHI Magnesita is a global supplier to the glass industry, increasing the productivity and product quality of our partners.
Refractory products for glass industry Electrofused AZS + Our range of electrofused products has been designed by European experts to bring the best performance, especially for optical, float and borosilicate glass and where low level of "refractory defects" is required.
Refractories Glass International November 2016 00 Unusual behaviour of knots in a float glass furnace Bala Mookoni* discusses the problem and possible causes of knots in a float glass furnace. I dentifying the source in an outbreak of defects in a glass melting furnace is always tricky. When the defects are
JTF Microscopy provides microanalytical services to the glass, raw materials, refractory, recycling, and related industries. We specialize in identification and analysis of defects and contaminants in glass, refractory products, and raw materials.
Our laboratory is equipped with latest technology including three Mass Spectrometers, SEM/EDX microprobe, various optical microscopes and very precise sample preparation equipment to address any melting, refining and forming defect problem in any kind of glass product. It is the biggest world independent laboratory for glass defects.
that the castable refractory is able to produce a smooth, pore free surface against a model. The refractory molds can be used for repeated casts without wear or damage provided the mold surface is smooth and minor defects are repaired between runs. The one-inch thick glass charges saw a …
Glass melting furnace refractories and refractory related defects. ... The refractories used in glass furnaces are in contact with the glass, the superstructure, the crown and the regenerator ...
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. Silica brick is a kind of acid refractory mainly made from tridymite, cristobalite and a small amount of residual quartz as well as glass phase.
Glass kiln refractory materials (such as fused zirconia corundum brick) in the course of its use, to withstand high temperature, rapid temperature changes, changes in the atmosphere and dust, flue gas, molten metal and slag erosion, the damage mechanism is …
68(1 J.F. Wosinski / Defects in specialty and container glasses defect from a barium-alumino-silicate glass. 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.
Original papers ORIGIN OF DEFECTS RELATED TO THE CORROSION OF THE REFRACTORIES IN LEAD CRYSTAL GLASS JEAN _ LOUIS HEITZ CRITT Materiaux LNE Est. 67305 SCHILTIGHEIM.France Submitted Jute 24, 1999; accepted July 23, 1999, This paper reports mechanisms of corrosion of the refractories used in industrial melting of lead crystal glass hollowware, and some chosen examples of defects …
Glass defects originating from glass melt/fused cast AZS refractory interaction Citation for published version (APA): van Dijk, F. A. G. (1994). Glass defects originating from glass melt/fused cast AZS refractory interaction ... The ultimate objective is a (semi) quantitative model for glass defect prediction from fused cast AZS in contact with ...