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← TechnologyWhich risk acutely increases when grinding cemented tungsten carbide?
A)Cobalt binder thermal decomposition✓
B)Diamond abrasive grain pullout
C)Oxide layer passivation failure
D)Titanium diboride phase transformation
💡 Explanation
Tungsten carbide grinding generates intense heat; because cobalt has a lower melting point than tungsten carbide, thermal decomposition via **selective leaching** occurs, weakening the matrix. Therefore, A ensues, rather than a bond or passivation issue.
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