Mechanical properties of cBN–Al composite materials

Mechanical properties of cBN–Al composite materials,10.1016/j.ceramint.2010.07.034,Ceramics International,Amanda McKie,Jami Winzer,Iakovos Sigalas,Mat

Mechanical properties of cBN–Al composite materials  
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The relationship between microstructure and mechanical properties for a wide range of composite materials based on polycrystalline cubic boron nitride and aluminium as a binder phase (PcBN–Al) has been examined. The PcBN–Al composites were made using high-pressure, high-temperature (HPHT) sintering methods, yielding materials with grain sizes of cBN between 2 and 20μm and an initial amount of Al binder between 15 and 25vol.%. Hardness ranged between 15 and 40GPa, while fracture toughness and strength were between 6.4–8.0MPam1/2 and 355–454MPa, respectively. Fractography was employed to investigate the large scatter in fracture strengths and correlate fracture strength with fracture toughness through the size of the fracture origins.
Journal: Ceramics International - CERAM INT , vol. 37, no. 1, pp. 1-8, 2011
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