Pressureless Sintering of Zirconium Diboride Using Boron Carbide and Carbon Additions
Pressureless Sintering of Zirconium Diboride Using Boron Carbide and Carbon Additions
复制标题
DOI：
10.1111/j.1551-2916.2007.01936.x
复制
发表时间：
2007-11
影响因子：
3.9
通讯作者：
Sumin Zhu;W. Fahrenholtz;G. Hilmas;S. Zhang
中科院分区：
文献类型：
--
作者：
Sumin Zhu;W. Fahrenholtz;G. Hilmas;S. Zhang
研究了碳化硼和碳添加物在通过无压烧结增强二硼化锆（ZrB2）致密化方面的协同作用。 ZrB2 在 1900°C 下烧结至相对密度 >99%。 2 wt% 碳化硼和 1 wt% 碳的组合通过去除表面氧化物杂质（ZrO2 和 B2O3）并抑制晶粒生长来促进致密化。测量四点弯曲强度（473±43 MPa）、维氏显微硬度（19.6±0.4 GPa）、断裂韧性（3.5±0.6 MPa·m1/2）和杨氏模量（507 GPa）。热重分析表明，添加剂的组合不会对氧化行为产生不利影响。
The synergistic roles of boron carbide and carbon additions in the enhanced densification of zirconium diboride (ZrB2) by pressureless sintering have been studied. ZrB2 was sintered to >99% relative density at 1900°C. The combination of 2 wt% boron carbide and 1 wt% carbon promoted densification by removing surface oxide impurities (ZrO2 and B2O3) and inhibiting grain growth. Four-point bending strength (473±43 MPa), Vickers' microhardness (19.6±0.4 GPa), fracture toughness (3.5±0.6 MPa·m1/2), and Young's modulus (507 GPa) were measured. Thermal gravimetry showed that the combination of additives did not have an adverse effect on the oxidation behavior.