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Boron Nitride ceramics are renowned for their excellent thermal stability and oxidation resistance, allowing them to be used in oxidizing atmospheres at around 1000°C and in inert atmospheres at nearly 3000°C. 
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High Thermal Stability: Boron Nitride ceramics can withstand very high temperatures without decomposing. In inert atmospheres (such as nitrogen, argon, or vacuum), Boron Nitride can maintain its structural integrity at temperatures close to 3000°C. This is because there are no reactive species to cause degradation, allowing the material to endure extremely high temperatures.
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Oxidation Resistance: In oxidizing atmospheres, such as air, Boron Nitride starts to oxidize at temperatures above approximately 700°C. However, it forms a protective oxide layer (boron oxide, B2O3), which can slow down further oxidation. This allows Boron Nitride ceramics to be used at temperatures up to about 1000°C without significant degradation. The protective oxide layer helps maintain the material's properties at these high temperatures.
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Stability Differences Among BN Forms: Hexagonal Boron Nitride (h-BN) exhibits different stability characteristics compared to cubic Boron Nitride (c-BN) and other forms.
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Disadvantages: The synthesis and processing of high-quality Boron Nitride are costly.
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