Dynamic oxidation protective ultrahigh temperatureceramic TaB2-20%wtSiC composite coating for carbon material
Dynamic oxidation protective ultrahigh temperatureceramic TaB2-20%wtSiC composite coating for carbon material
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动态%20氧化%20防护%20超高%20温度%20陶瓷%20TaB2-20%%20wtSiC%20复合%20涂层%20for%20碳%20材料
DOI：
10.1016/j.compositesb.2018.10.080
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Ziyu Li
中科院分区：
文献类型：
--
作者：
Xuanru Ren;Wenhao Wang;Tianqi Shang;Hongsheng Mo;Peizhong Feng;Litong Guo;Ziyu Li
为提高碳材料的抗氧化性能，采用液相烧结法制备了含高含量TaB2的TAB2-20%wt碳化硅复合涂层。涂层样品呈现持续增重的趋势，最终失重率约为1.35%，失重率曲线上没有失重区，但在80 0 °C附近有一个快速增重区。生成的复合玻璃层呈现出Ta氧化物/Tasingle键B单键Sisingle Bondo/SiO2三层结构。表面粗糙的Ta氧化物层增加了玻璃层的氧化防御区，而自封闭的Tasingle Bone Bond Sisingle Bondo/SiO2复合微晶玻璃层可以阻止微裂纹，阻断了氧的快速扩散通道。
TaB2–20%wtSiC composite coating containing high content of TaB2was synthesized by liquid phase sintering method to enhance the anti-oxidation property of the carbon materials. The coated sample exhibits a trend of sustained weight gain whose final value is about 1.35%, while there is no weight loss zone in weight loss rate curves, but a rapid weight gain region around 800 °C. The generated compound glass layer presents a structure of Ta-oxides/Tasingle bondBsingle bondSisingle bondO/SiO2triple glass layer. The rough surface of top Ta-oxides layer increases the oxidation defensive area of the glass layer, while the self-sealing Tasingle bondBsingle bondSisingle bondO/SiO2compound glass ceramics layer can arrest the microcracks, blocking the fast diffusion channel of oxygen.