Bo Guangxu, Tian Xiaoke, Li Huanhuan, Ye Luona, Xu Xiaoling, Gu Zhaorui, Yan Jinyong, Su Xingjian, Yan Yunjun
Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
Materials (Basel). 2024 Jul 9;17(14):3394. doi: 10.3390/ma17143394.
Ultra-high temperature ceramics (UHTCs) have been widely applied in many fields. In order to enhance the comprehensive properties of TaB-based UHTCs, the first collaborative use of fine TaC particles and dispersed multi-walled carbon nanotubes (MWCNTs) was employed via spark plasma sintering (SPS) at 1700 °C. The derived UHTCs exhibited an average grain size of 1.3 μm, a relative density of 98.6%, an elastic modulus of 386.3 GPa, and a nano hardness of 21.7 GPa, leading to a greatly improved oxidation resistance with a lower linear ablation rate at -3.3 × 10 μm/s, and a markedly reinforced ablation resistance with mass ablation rate of -1.3 × 10 mg/(s·cm). The enhanced ablation resistance was attributable to the physical pinning effect, sealing effect and self-healing effect. Thus, this study provides a potential strategy for preparation of UHTCs with bettered ablation resistance and physical properties.
超高温陶瓷（UHTCs）已在许多领域得到广泛应用。为了提高TaB基超高温陶瓷的综合性能，首次通过在1700℃下进行放电等离子烧结（SPS），协同使用了细TaC颗粒和分散的多壁碳纳米管（MWCNTs）。所得的超高温陶瓷平均晶粒尺寸为1.3μm，相对密度为98.6%，弹性模量为386.3GPa，纳米硬度为21.7GPa，从而极大地提高了抗氧化性，线性烧蚀率降低至-3.3×10μm/s，并且显著增强了抗烧蚀性，质量烧蚀率为-1.3×10mg/(s·cm)。抗烧蚀性增强归因于物理钉扎效应、密封效应和自愈合效应。因此，本研究为制备具有更好抗烧蚀性和物理性能的超高温陶瓷提供了一种潜在策略。
