SiC compounds and increasingly also SiC plates are being used in the combustion chambers of refuse incineration plants for moderating heat transfer and for avoiding corrosion. At a series of plants, the life cycle of a supply of SiC compound hasconsiderably reduced in the past year, partly to under 10,000 hours of operation. The failure of the SiC compound is, as a rule, characterized by a relatively rapid and extensive bulging, peeling off and decomposition and can be accompanied byconsiderable corrosion of the boiler tubing. In order to assess the causes of the defects and to explain the dynamics of the damage, a comparative chemical-mineralogical investigation has been carried out on SiC Compounds at several plants. SiC plantshave also been involved in the investigation. The results show that the damage to the SiC compounds is characterized by an increasing loading of salt and by rampant pin hole corrosion and phase transformation.
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