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Titanium diboride
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===Exceptional hardness at extreme temperature=== *2nd hardest material at 3000°C ([[diamond]]) *3rd hardest material at 2800°C ([[Cubic boron nitride|cBN]]) *4th hardest material at 2100°C ([[Boron carbide|B<sub>4</sub>C]]) *5th hardest material at 1000°C ([[Boron suboxide|B<sub>6</sub>O]])
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