The major objective in glass tank melters is to optimize the entire process by reducing the maximum temperature of melting, improving refractory performance and/or improving melter fuel efficiency. The required characteristics of refractories used in melters are: thermal shock resistance, corrosion resistance, controlled expansion behavior, low thermal conductivity, and adequate creep resistanc...

This paper introduces the concepts of Moldability and Castability of simple polygons and relates Moldability to Monotonicity. We detail a (n) algorithm for determining all n forward maximal monotone chains of a simple polygon and apply this algorithm to the problems of determining 2-Moldability, 2-Castability and the minimum monotone decomposition of a simple polygon 9]. Our results include a s...

Refractory castables are utilized in hazardous environments and thus their reliability should be accurately evaluated to avoid incidents. This work aims measure the fracture energy of a high-alumina refractory with mullite-zirconia aggregates at 600 °C. Wedge Splitting Tests were performed on 5 samples different sintering temperatures. Images acquired analyzed via Digital Image Correlation (DIC...

the basic trait in the ceramics is their high brittle or low fracture toughness, and the main criteria in the design and application is specifying the fracture toughness in ceramics. in this paper, a new method is proposed to determine the fracture toughness of ceramics, which is enhanced in lowering the cost of fracture toughness determination relative to the previous methods. hence due to the...

Field-assisted sintering technique (FAST) is used for the preparation of Nb–Al2O3 composite materials. The electrical conductivity investigated depending on particle size starting powders and under varying volume contents refractory metal in powder mixture. percolation threshold found to be influenced not only by fraction but also alumina sample preparation. For fine- coarse-grained alumina, a ...

OBJECTIVES This study aimed to compare the dimensional accuracy of two indexing materials, an acrylic resin (GC pattern resin) and a castable composite (Bredent). The effect of time lapse until investment was also investigated. MATERIALS AND METHODS Two standardized brass dies 15 mm apart were prepared and then 20 identical coping-bar assemblies were designed and fabricated by a rapid prototy...