材料科学
放电等离子烧结
微观结构
烧结
碳化硼
复合材料
碳化钛
陶瓷
二硼化钛
钛
断裂韧性
大气温度范围
碳化物
透射电子显微镜
冶金
纳米技术
气象学
物理
作者
Filiz Çınar Şahin,Mubashir Mansoor,Meral Cengiz,Burcu Apak,Leyla Yanmaz,Katalin Balázsi,Zsolt Fogarassy,Bora Derin,Gültekin Göller,Onuralp Yücel
标识
DOI:10.1021/acs.jpcc.2c06179
摘要
Square-shaped boron carbide ceramic composites have been produced by spark plasma sintering with the addition of 5 to 20 vol % titanium metal powder in the B4C matrix in order to initiate an in situ self-propagating high-temperature synthesis (SHS) of TiB2. The SHS reaction not only enhances many of the physical and mechanical properties of B4C, but also reduces the required sintering temperature and pressure because of the enthalpy of reaction between metallic Ti and B4C. Sintering has been carried out in the SPS-temperature range of 1450 to 1550 °C with a uniaxial pressure of 40 MPa and a dwell time of 4 min under a 1 atm argon atmosphere. The effects of various amounts of Ti additions and sintering temperature on the phase composition, density, hardness, fracture toughness, and microstructure are examined. X-ray diffraction and transmission electron microscopy evaluations have shown that added Ti completely transforms into TiB2, resulting in a core–shell microstructure with a carbon core, surrounded by a TiB2 shell in the B4C matrix. Moreover, by carrying out a control experiment where TiB2 was added instead of Ti, and performing a molecular dynamics simulation of the B4C-Ti interface, the significance of the in situ SHS process has been validated.
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