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SEM images of the fractured surfaces of MWNT-reinforced HA composites. ((a1), (a2), (a3)) pure HA; ((b1), (b2), (b3)) 1 vol%; ((c1), (c2), (c3)) 3 vol%; ((d1), (d2), (d3)) 5 vol%; and ((e1), (e2), (e3)) 10 vol% MWNT-reinforced HA composites. The numbers (1, 2, 3) represent the sintering temperatures (900, 1000, and 1100°C, resp.).
