Sol-gel mullite matrix-SiC and -mullite 2D woven fabric composites with or without zirconia containing interphase: Elaboration and properties
Sol-gel mullite matrix-SiC and -mullite 2D woven fabric composites with or without zirconia containing interphase: Elaboration and properties
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DOI：
10.1016/0955-2219(95)00189-1
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发表时间：
1996
影响因子：
5.7
通讯作者：
P. Colomban;E. Bruneton;J. Lagrange;E. Mouchon
中科院分区：
文献类型：
--
作者：
P. Colomban;E. Bruneton;J. Lagrange;E. Mouchon
报道了用尼龙NLM202碳化硅或Nextel®440莫来石纤维织物制成的复合材料的性能。用于制造复合材料的方法是三个阶段的溶胶凝胶法：(I)在陶瓷纤维织物中原位凝胶化混合醇盐；(Ii)在浸渍的织物上沉积基质前体；(Iii)在碳模中热压堆叠的织物。用扫描电子显微镜和透射电子显微镜对复合材料进行了研究。在室温和900℃空气中测量了三点弯曲强度。在RT条件下测定了材料的局部杨氏模数、显微硬度和界面剪应力。用显微拉曼光谱和X射线微区分析研究了光纤-界面反应。以铝硅酯和三丁基硼酸盐的混合物为界面前驱体，得到了无碳膜的碳化硅-莫来石滑动界面。使用互补的ZrO2-GeO2凝胶界面前驱体使我们能够在低温下获得致密的复合材料，并具有良好的机械性能(线性性能高达~180兆帕，即使在空气中热处理后也是如此)。讨论了氧化锆界面相对莫来石-莫来石复合材料力学性能的影响。
The properties of composites made with fabrics of Nicalon®NLM202 SiC or Nextel®440 mullite fibers are reported. The method used to make composites is a three stages sol-gel process: (i) in situ gelation of a mixture of alkoxides in a ceramic fiber fabric; (ii) the deposit of a matrix precursor onto the impregnated fabrics and (iii) hot-pressing of the stacked fabrics in a carbon mold. The composites have been studied by SEM and TEM. Three point flexural strength has been measured at room temperature and at 900 °C in air. Local Young's modulus, microhardness and interfacial shear stress have been determined at RT. Micro-Raman spectra and X-ray microanalysis have been used to study the fiber-interface reactions. Using a mixture of aluminium-silicon ester and tributylborate as interface precursor, we obtained a carbon film free SiC-mullite sliding interface. The use of a complementary ZrO2-GeO2gel interface precursor allows us to obtain dense composites at a low temperature exhibiting good mechanical properties (linear behaviour up to ~180 MPa, even after annealing in air). The effects of a zirconia interphase on the mechanical properties of mullite-mullite composite are also discussed.