Oxidation protection of C/C–SiC composites by an electrophoretically deposited mullite precursor: Cyclic thermogravimetric analysis
Oxidation protection of C/C–SiC composites by an electrophoretically deposited mullite precursor: Cyclic thermogravimetric analysis
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DOI：
10.1016/j.jeurceramsoc.2006.04.026
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发表时间：
2007
影响因子：
5.7
通讯作者：
T. Damjanović;C. Argirusis;B. Jokanović;G. Borchardt;K. Moritz;E. Müller;R. Herbig;R. Weiss
中科院分区：
文献类型：
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作者：
T. Damjanović;C. Argirusis;B. Jokanović;G. Borchardt;K. Moritz;E. Müller;R. Herbig;R. Weiss
采用溶胶-凝胶技术在C/C-Si-SiC复合材料表面制备了足够厚且均匀的莫来石层，在温度为10 0 0℃时转变为莫来石。沉积莫来石层的保护性在空气中1200≤T≤1550°C的温度范围内进行了等温测试，最长可达200h。当温度高于1600℃时，由于在碳化硅涂层裂纹上方形成CO气泡和液相的存在，降低了沉积层的保护能力。为了延长我们的莫来石层在高温下的保护性，在含有5wt%Al_2O_3粉末的莫来石前驱体悬浮液中沉积了额外的一层。还测试了莫来石和莫来石/Al_2O_3多层膜体系在循环条件下的保护性能。这些实验产生了令人鼓舞的结果，这需要在更高的温度下才能得到证实。
Sufficiently thick and homogeneous layers which transform into mullite at T≥1000°C were synthesized by means of sol–gel technology and electrophoretically deposited onto the surface of C/C–Si–SiC composites. The protectiveness of the deposited mullite layers was isothermally tested in air in the temperature range 1200≤T≤1550°C for up to 200h. At temperatures above 1600°C, the protectiveness of the deposited layer is reduced due to the existence of a liquid phase and the formation of CO bubbles above the cracks in the SiC layer. In order to prolong the protectiveness of our mullite layers at higher temperatures an additional layer from a suspension of mullite precursor with 5wt.% of Al2O3powder was deposited. The protectiveness of the obtained mullite and mullite/Al2O3multilayer systems were also tested under cyclic conditions. These experiments yielded encouraging results, which will have to be confirmed at higher temperatures.