Ultra-high temperature ablation behavior of Ti2AlC ceramics under an oxyacetylene flame
Ultra-high temperature ablation behavior of Ti2AlC ceramics under an oxyacetylene flame
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DOI：
10.1016/j.jeurceramsoc.2010.11.035
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发表时间：
2011-05
影响因子：
5.7
通讯作者：
G. Song;Shibo Li;Chuangxin Zhao;W. Sloof;S. Zwaag;Y. Pei;J. Hosson
中科院分区：
文献类型：
--
作者：
G. Song;Shibo Li;Chuangxin Zhao;W. Sloof;S. Zwaag;Y. Pei;J. Hosson
通过测量烧蚀样品的尺寸和重量变化，研究了 Ti2AlC 陶瓷在氧乙炔火焰和高达 3000°C 温度下的线性和质量烧蚀速率。线性消融率从消融前30秒的0.14μms−1下降到180秒后的0.08μms−1。 Ti2AlC 陶瓷在烧蚀时会增加少量重量，这是由于烧蚀表面上形成了氧化产物。烧蚀表面呈现两层结构：氧化物外层，主要由α-Al2O3和TiO2以及一些Al2TiO5组成，以及多孔亚表面层，含有Ti2Al1−xC和TiCxOy。随着烧蚀时间的增加，外层TiO2和Al2TiO5含量增加，亚表层孔隙增多。 Ti2AlC在火焰下的热氧化和气炬高速流动对粘性氧化产物的冲刷是主要的烧蚀机制。
The linear and mass ablation rates of Ti2AlC ceramics under an oxyacetylene flame at a temperature up to 3000°C were examined by measuring the dimensions and weight change of the ablated samples. The linear ablation rate was decreased from 0.14μms−1for the first 30s of the ablation to 0.08μms−1after 180s. Ti2AlC ceramics gained small amounts of weight upon ablation, which is attributed to the formation of oxidation products on the ablated surface. The ablation surface exhibits a two-layer structure: an oxide outer layer, consisting mainly of α-Al2O3and TiO2and some Al2TiO5, and a porous sub-surface layer containing Ti2Al1−xC and TiCxOy. With increasing ablation time, the content of TiO2and Al2TiO5in the outer layer increased, and more pores developed in the sub-surface layer. The thermal oxidation of Ti2AlC under the flame and scouring of the viscous oxidation products by high-speed flow of gas torch are the main ablation mechanisms.