碳化硼陶瓷的高温高压制备及性能研究

High-temperature and high-pressure synthesis and performance study of boron carbide ceramics

利用六面顶液压机,以铝、钴为烧结助剂,在压力5.0-5.5 GPa、温度1 350-1 700℃、保温时间5 min的条件下制备出碳化硼陶瓷,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,研究了压力、温度对碳化硼复合陶瓷力学性能的影响。实验结果表明,在5.5 GPa、1 550℃时,碳化硼陶瓷具有较好的综合性能,维式硬度为4 022 HV、磨耗比为2.5。其中铝、钴作为烧结助剂不仅降低了烧结温度还促进烧结反应,增强颗粒间的扩散促使陶瓷更快地达到高致密度,改善其力学性能。

Using a six-faced hydraulic press and employing aluminum and cobalt as sintering additives,boron carbide ceramics were prepared under the conditions from 5.0 to 5.5 GPa,and the temperature rage of 1 350 ℃-1 700 ℃,and a 5-minute insulation period.The phase analysis,microstructural characterization,and hardness measurements of the boron carbide composite ceramics were conducted using XRD diffractometer,SEM scanning electron microscope,and Vickers hardness tester.The study investigated the influence of pressure and temperature on the mechanical properties of the boron carbide composite ceramics.Experimental results demonstrated that at 5.5 GPa and 1 550 ℃,the boron carbide ceramics exhibited excellent overall performance,with a Vickers hardness of 4 022 HV and a wear ratio of 2.5.Aluminum and cobalt,serving as sintering additives,not only reduced the sintering temperature but also promoted sintering reactions,enhancing the diffusion between particles and enabling the ceramics to achieve high density more rapidly,thus improving their mechanical properties.