Abstract
A study was conducted on the effect of surface cracks on the tensile strength of ceramics used for the lower-quality fueled gas turbine or diesel engine. The former study already reported that the existence of artificial corrosive ash containing vanadium pentoxide and sodium sulphate on flaws significantly enhances the tensile strength of the partially stabilized zirconia at 650°C where the specimens were heated with an electric furnace. This report deals with the burner rig test results of ceramics having considerable surface defects. After 49-hour exposure in a 900°C corrosive gas stream, the tensile strength of the silicon nitride specimens which had a surface defect induced with the vickers indentation load of 30kgf considerably increased. This strength is the same or better then that of smooth specimens.
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