摘要
利用六面顶液压机,以铝、钴为烧结助剂,在压力5.5 GPa,温度1 470℃,保温时间5 min的条件下制备出碳化硼-立方氮化复合陶瓷.并通过XRD衍射仪、SEM扫描电镜、维式硬度仪对其进行了物相分析、微观形貌表征和硬度测量,并研究了不同含量的立方氮化硼对碳化硼复合陶瓷力学性能的影响.实验结果表明,当碳化硼和立方氮化硼的比例为7∶3时,复合陶瓷具有较好的综合性能,维式硬度为41.6 GPa、密度为2.45 g/cm3、磨耗比为2.5.将立方氮化硼作为增强材料不仅保持了碳化硼的硬度还兼顾了轻质性能.而铝、钴作为烧结助剂不仅降低了烧结温度还抑制了立方氮化硼向六方氮化硼的转变.
Abstract
In this study,a boron carbide-cubic boron nitride composite ceramic was pre-pared using a six-sided top hydraulic press with aluminum and cobalt as sintering aids.The composite was synthesized under a pressure of 5.5 GPa,a temperature of 1 470℃,and a holding time of 5 minutes.The phase analysis,microstructural characterization,and hardness measurement of the composite were conducted using XRD diffractometer,SEM scanning elec-tron microscope,and Vickers hardness tester,respectively.The influence of different contents of cubic boron nitride on the mechanical properties of the boron carbide composite ceramics was in-vestigated.The experimental results showed that the composite with a boron carbide to cubic boron nitride ratio of 7∶3 exhibited excellent comprehensive performance,with a Vickers hard-ness of 41.6 GPa,a density of 2.45 g/cm3,and a wear ratio of 2.5.The addition of cubic boron nitride as a reinforcement material maintained the hardness of boron carbide while also consider-ing lightweight properties.Furthermore,aluminum and cobalt,as sintering aids,not only re-duced the sintering temperature but also suppressed the transformation from cubic boron nitride to hexagonal boron nitride.
基金项目
黑龙江省属高校基本科研业务费科研项目(1354MSYQN023)
牡丹江师范学院大学生创新创业训练计划项目(202310233001)
维普
万方数据