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采用化学共沉淀法合成石墨烯(rGO)/羟基磷灰石(HA)粉末,并通过微波烧结制备rGO/HA复合材料。采用XRD、场发射扫描电镜、数显维氏硬度计和万能试验机对其组织和力学性能进行分析和测定,探讨烧结工艺对复合材料显微硬度、断裂韧性和抗弯强度的影响。结果表明:微波烧结较常规烧结可以降低烧结温度,缩短保温时间,随烧结温度提高和保温时间的增加,rGO/HA复合材料的显微硬度、断裂韧性和抗压强度均呈先增大后减小。相比于纯HA,rGO/HA复合材料显微硬度、断裂韧性和抗弯强度分别提高7.16%、31.59%和76.2%。
The graphene (rGO) / hydroxyapatite (HA) powders were synthesized by chemical coprecipitation and the rGO / HA composites were prepared by microwave sintering. The microstructure and mechanical properties of the composites were analyzed and measured by XRD, field emission scanning electron microscopy, digital Vickers hardness tester and universal testing machine. The effects of sintering process on the microhardness, fracture toughness and flexural strength of the composites were investigated. The results show that microwave sintering can reduce the sintering temperature and shorten the holding time compared with conventional sintering. The microhardness, fracture toughness and compressive strength of rGO / HA composites increase at first and then decrease with the increase of sintering temperature and holding time small. Compared with pure HA, the microhardness, fracture toughness and flexural strength of rGO / HA composites increased by 7.16%, 31.59% and 76.2%, respectively.