Laser ablation behavior of SiHfC-based ceramics prepared from a single-source precursor: Effects of Hf-incorporation into SiC

被引:32
作者
Wen, Qingbo [1 ]
Luan, Xingang [2 ,3 ]
Wang, Lei [2 ,3 ]
Xu, Xinming [2 ,3 ]
Ionescu, Emanuel [1 ]
Riedel, Ralf [1 ,3 ]
机构
[1] Tech Univ Darmstadt, Inst Mat Wissensch, Otto Berndt Str 3, D-64287 Darmstadt, Germany
[2] Northwestern Polytech Univ, Sci & Technol Thermostruct Composite Mat Lab, Xian 710072, Shaanxi, Peoples R China
[3] NPU TU Darmstadt, Joint Int Res Lab Ultrahigh Ceram Matrix Composit, Darmstadt, Germany
关键词
Laser ablation; Ablation mechanism; HfC/SiC nanocomposites; C-f/SiHfC; UHT CMCs; SILICON-CARBIDE; OXIDATION RESISTANCE; NANOCOMPOSITES; COMPOSITES; PHASE; ZRB2;
D O I
10.1016/j.jeurceramsoc.2019.01.040
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Laser ablation test of SiHfC-based ceramic nanocomposites as well as ceramic matrix composites (CMCs) was conducted by exposure to a CO2 laser beam in air. Laser ablation behavior and possible degradation mechanisms of dense monolithic HfC/SiC ceramic nanocomposites as well as of C-f/SiHfC CMCs were investigated. Dense SiC monoliths and C-f/SiC CMCs were exposed to same laser ablation conditions and considered as reference materials. The evolution of microstructure and chemical/phase composition of the studied ceramics was addressed by scanning electron microscopy (SEM) combined with energy dispersive X-ray spectroscopy (EDX) as well as by X-ray diffraction. The results reveal that from the center to the edge of the damaged region of the materials three sections with different surface morphologies and ablation mechanisms are identified. The comparation between the SiC-based monoliths and CMCs with and without Hf demonstrates the positive effects of Hf-incorporation on their laser ablation resistance.
引用
收藏
页码:2018 / 2027
页数:10
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