Why Nitride Bonded Silicon Carbide Cracks in Cyclic Kilns
Why Nitride Bonded Silicon Carbide Cracks in Cyclic Kilns Even When Strength Numbers Look High I’ve spent twelve years working with silicon nitride bonded silicon carbide in kiln furniture and high-temperature fixtures, and the failures that show up most often aren’t from simple overload. They come from repeated thermal cycling that opens up oxidation damage in the nitride bond phase. The material starts with good room-temperature strength and decent thermal shock resistance, but once it sees enough heat-up and cool-down cycles in air, the silicon nitride that ties the silicon carbide grains together begins to oxidize. That oxidation creates volume expansion and micro-cracks that eventually link up. Nitride bonded silicon […]
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