本文主要研究了不同烧结工艺对碳纳米管/羟基磷灰石复合材料力学性能与微观结构的影响.力学性能测试结果显示,在真空气氛下烧结的复合材料力学性能在总体上要高于Ar或N2气氛保护下烧结所得复合材料,断裂韧性的提高幅度最大,其最高值达到了2.2 MPa·m1/2,远高于纯羟基磷灰石.XRD及IR研究发现,所制备复合材料纯度高,无其它杂质.SEM观察发现,1100℃,真空下所得复合材料的致密性高,晶粒细,但碳纳米管管径增大;而Ar或N2气氛保护下所得复合材料中碳纳米管容易以原始形态保存,但孔隙率高,晶粒粗.
In this paper, the influence of different sintering technique on mechanical properties and microstructure of CNTs/HAp composite was studied. The mechanical properties of CNTs/HAp composite sintered in vacuum is more higher than that in Ar or N2. The increasing range of fracture toughness is the biggest. The maximum is 2.2 MPa·m1/2 which is higher than that of the pure hydroxyapatite. We found that the composite is very pure by XRD and IR. After sintered in vacuum at 1100℃, CNTs/HAp composite has less pore and more thin grain , at the same time, the diameter of CNTs will be enlarged. After sintered in Ar or N2 at 1100℃,the CNTs in composite can easily be preserved in its primitive shape but the composite is more porous and grains are bigger.
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