Using a six-faced hydraulic press and employing aluminum and cobalt as sinte-ring 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 scan-ning electron microscope,and Vickers hardness tester.The study investigated the influ-ence of pressure and temperature on the mechanical properties of the boron carbide com-posite ceramics.Experimental results demonstrated that at 5.5 GPa and 1 550℃,the bo-ron 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.
关键词
高温高压/碳化硼/硬度/磨耗比
Key words
High-temperature and high-pressure/Boron carbide/Hardness/Wear ratio
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