Corrosion of azs refractories source of defects in. Jun 26, 2015 fused cast azs corrosion is a more potent and longterm source of defects. It also describes the structure of the heatinsulating and refractory materials used to line such furnaces. In the casting process, molten material is poured into the mould, and th occurs during annealing and e shrinkage of material solidification of the melt. The chemical composition of fused cast azs is one of the key factors that determine the crystal structure and the. Pdf fusedcast refractories for high quality glasses.
Fluxes high temperature products refractory engineers. If an internal link led you here, you may wish to change the link to point directly to the intended article. Fused cast high zirconia bricks are made of artificial synthesis high purity raw materials through special casting process. He songshen follow engineer manager at zhengzhou sunrise refractory co. Glass furnaces suffer permanent infiltrations of the alkali compounds, vapours and liquid. You are correct about the uses of refractory brick in high temperature applications. Flux is used in foundries for removing impurities from molten nonferrous metals. Course content abstract refractories are heat resistant materials used in almost all processes involving high temperatures andor corrosive environment.
Technical materials mission is simple but not easy. Glass melt contact refractory corrosion can lessen with time due to boundary layer formation and the effect of external cooling at the metal line. The currently available azs refractories enable the glass maker to. When the azs lining interacts with molten glass, there is typically a corrosion reaction layer at glass contact that remains attached to the lining. Let reis refractory experts provide technical advice and assistance with any of your flux selection, refractory product, or refractory service requirements. Api 936, refractory installation quality control inspection and testing monolithic refractory linings and materials, provides installation quality control guidelines for monolithic refractory linings and may be used to supplement owner specifications. China electrofused cast azs refractory for glass furnaces. The glass melter for this process will consist of a refractory lined tank enclosed in a watercooled, steel vessel and fed by an aqueous slurry of glass frit plus radioactive waste.
The main products of sunrise include fused cast azs block, fused cast alumina block, mullite brick, zircon brick, alumina bubble brick, sillimanite brick, corundum brick, low porosity fireclay brick, high alumina brick, all kinds of glass furnace ramming masses, etc. The feasibility of pieces made out of sintered materials is a complex issue which depends on the interaction between several parameters, such as the type of material, the type of manufacturing process, the complexity of the shape, the dimensions of the pieces and the number of pieces to be made. Technology of refractory materials and heat insulating. Fused cast azs has no open porosity but there are some closed voids and pores which arise from the manufacturing process. Explosive spalling of low cement castable refractories a. 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. Technical materials sells best quality high temperature materials such as azs refractories, ceramic brick, and graphite insulation materials for high temperature applications. Sunrise is a refractory material supplier from china. The fused cast aluminazirconiasilica azs refractory is an indispensable material for state of the art glass melting furnaces. This disambiguation page lists articles associated with the title azs. Fused cast high zirconia bricks description the series of tyz are fused cast high zirconia refractories which are specially designed refractory for glass furnace application.
These refractory standards help materials science laboratories, material processing companies, product manufacturers, and other producers and users of such materials and products in their proper fabrication and treatment procedures to ensure good quality and workmanship towards safe utilization. Comparison of azs made with different manufacturing processes. Infact,theelaborationconsistsincooling from 2400 c to room temperature a material which solidi. The refractory compositions consist essentially of a 4085 wt. It is widely applied to glass furnace for superstructure, working pool side wall, paving blocks, feeder channels, tank bottoms, cshaped block and doghouse crown,etc. Refractory solutions for glass harbisonwalker international. This book encompasses the entire range of industrial refractory materials and forms. Apart from these we can classify refractories into few more.
Fused azs grain refractory compositions suitable for making ceramically or chemically bonded refractory articles, and the articles so made, are disclosed. However, another problem encountered in glass industry is contamination by refractory material that fall into the molten glass, which can produce a series of defects in the final product. This industry profile of the refractory manufacturing industry provides information to support the regulation. Mechanical behavior characterization of high zirconia. As an aid to understanding the melting process and scaling data. You have received study materials for extramural studies for the subject refractory materials and heat insulating materials of 2nd semester of following masters study field. China electrofused cast azs refractory for glass furnaces, find details about china azs refractory, fused cast azs refractory from electrofused cast azs refractory for glass furnaces zhengzhou dongfang ancai refractory co. Requirements are formulated for the quality of electrofused aluminazirconiasilica azs refractories used in high capacity glassfounding furnaces. Commercial azs aluminazirconiasilica refractories are a good alternative in refractory materials for the glass industry because they can support the aggressive conditions during liquid processing of glass.
The azs family of shapes consists of end pieces and an 18 wide x 12 to 22 middle channel section with 2 joints. A fundamental approach has been taken, centered on the development of a three. Prerequisites there are no prerequisites set for the studies of this subject. How to classify refractory materials the best method to classify the refractory materials is on the basis of their chemical behavior, i. The products are manufactured in wide variety of shapes and sizes and special requirements can be accomodated too this insert is grinded and assembled by refmon. Refractory brick, or fire brick as it is often called, can withstand temperatures as high as 4,000 f and is commonly found in furnaces, fireplaces or exhaust stacks.
An increase in bulk density of a given refractory increases its volume stability, heat capacity and resistance to slag. Since calcium aluminate bonded low cement castable refractories were first developed, explosive spalling during dryout has been an ongoing problem for refractory manufacturers, installers, the end user and the service company hired to perform the initial dryout. A refractory is a material that retains its shape and chemical identity when subjected to high temperatures and is used in applications that require extreme resistance to heat. Call 18773652995 to order azs bricks, zirconia bricks, zircon mullite bricks, and other refractory bricks, and our fast, responsive customer service and reliable delivery service will save you time and money. Apr, 2006 this research was conducted to develop new formulations of azs aluminazirconiasilica refractories with different amounts of zro2 with the purpose of improving properties and the work conditions in the glass melting furnaces and, at the same time, lower the costs this type of refractories. We want to sell the best quality high temperature materials needed by our customers at the best price they can get to allow them to be competitive in their product area, product material,tungsten and molybdenum, tungsten and molybdenum products, steelmaking, steelmaking products, carbon felt and graphite felt,carbon felt and graphite felt. Dec 18, 20 this article describes the parameters for the efficient operation of modern glassfounding furnaces designed to produce commercial glass. Azs refractories have three microstruc tural components. Their types are defined according to the zro 2 content and they are mainly composed of 49%al 2 o 3, 32. For more information on thermbond refractory solutions installation guides, please contact us at 561 3309300.
These are typically used to insulate and protect industrial furnaces and vessels due to their excellent resistance to heat, chemical attack and. As the pioneer of monolithic refractories, plibrico japan has since been engaged in the. Pdf fused cast refractories for high quality glasses. The bulk density is useful property of refractories, which is the amount of refractory material within a volume kgm3. Electrofused azs refractories for highcapacity glass. Harbisonwalker international hwi provides the largest refractory manufacturing capacity to the glass industry in north america. Standard test method for testing of glass exudation from azs.
We can special order depths greater than 12 inches. Ceramic refractories, azs, ceramic, azs refractory. Refractories school of materials science and engineering. Fused cast azs 33 block has dense micro structure which ensures its great resistance in glass liquid, thus it is widely applied to glass furnace for superstructure, paving blocks, etc. Refractories because of their high heat resistance, ceramic materials are used as refractories. The development of nondestructive inspection method for. Fused cast azs refractoryrefractory brick refractory furnace. Accordingly we have three categories of refractory materials.
Refractory ceramics are insulating materials and are designed to withstand high stresses and temperatures and must also resist the effects of molten metals, abrasive particles and hot gases. Direct attack occurs by condensation of the hot face of the refractory. Development of azs refractories for the glass industry. Cast azs made with different manufacturing processes. Products specs zircon mullite brick mz20 zircon mullite brick mz30 bonded azs brick azs 30a bond azs brick azs 30b zirconia corund um brick za33. Our refractory products provide a competitive edge. Kt refractories distributes azs bricks, zirconia bricks, zircon mullite bricks, and other refractory bricks of the best quality at the most competitive prices worldwide. A wide variety of azs refractory options are available to you, such as shape, material, and refractoriness degree. Published on february 23, 2016 february 23, 2016 11 likes 6 comments. Materials, equipment, and personnel are qualified by the methods described, and applied. Over 85 years of research and development in the glass market have enabled us to pioneer innovative glass solutions.
The formation of the microstructure during production of the fused cast azs blocks can be illustrated by phase diagrams and with the help of an ice block. University of missourirolla, department of ceramic engineering, rolla, missouri 654090330, usa glasses, natetraborate and b 2 o 3 predominate. The azs style glass tank is designed primarily for the glass artist who desires 400600800 lb. Jul 16, 2015 fused cast azs block is the essential refractory material used in the demanding areas of glass furnaces.
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