BETA - SYALON |
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| The different SYALON forms: Syalons/Sialons are alloys, based on silicon nitride as the solvent. Because beta-Syalon has the same atomical arrangement, its mechanical and physical properties are almost similar to those of silicon nitride. Chemically, it has some of the features of alumina, Al2O3 . Our standard product range is based on beta silicon nitride. Clearly Syalons can also be made that are based on alpha silicon nitride and on oxynitride each of which has a different crystallographic structure. These different forms have traditionally been denoted by the notations alpha-prime, beta-prime or O-prime, also known as alpha-Sialon, beta-Syalon or O-Sialon. O-Sialon is based on silicon oxynitride; it is not as strong or as hard as beta-Syalon. It is not cheaper than other SiN/Syalon/Sialon types unless it is produced by some novel processing techniques which are more and more common for the production of O-Sialon. Such techniques involve carbothermal reduction in which cheap raw materials such as coke and sand are converted to a Sialon by heating in nitrogen. Usually our material is described as Syalon. Our material is a hundred percent beta-quality (no other, probably cheaper components are added). We fire our beta-Syalon at 2000° C (!) meanwhile most O-types are fired at 1200 - 1300° C. The higher temperature results into a material which is absolutely gastight with zero porosity. |
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