Ceramic Composites with Multilayer Interface Coatings
Ceramic Composites with Multilayer Interface Coatings
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具有多层界面涂层的陶瓷复合材料
DOI：
10.1111/j.1151-2916.2000.tb01676.x
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
K. More
中科院分区：
文献类型：
--
作者：
T. Besmann;E. Kupp;E. Lara‐Curzio;K. More
碳化硅基复合材料由陶瓷级NicalonTM或Hi-NicalonTM纤维制成，纤维表面涂有由六层碳和碳化硅交替层组成的界面材料。最初的努力涉及使用化学气相渗透来生产微型复合材料（单束纤维）。在随后的工作中，强制流动的热梯度化学气相渗透被用来生产一个单一的复合板与多层界面的陶瓷级Nicalon织物和两个板的Hi-Nicalon织物，一个与一个单一的碳层和一个与多层界面。从板上切下的微型复合材料和试样的拉伸试验显示了加工样品的典型复合材料行为和强度。拉伸试样暴露于950°C空气中100 h导致强度和应变容限的大幅损失，而与界面涂层无关。结果表明，强制流动热梯度化学气相渗透法可用于制备多层界面材料。结果还证实，相对厚（>100 nm）的单个或多个碳层易受氧化影响，从而导致复合材料性能的损失。
Silicon carbide matrix composites have been fabricated from either ceramic-grade NicalonTM or Hi-NicalonTM fibers coated with an interface material consisting of six alternating carbon and silicon carbide layers. Initial efforts involved the use of chemical vapor infiltration to produce minicomposites (single tows of fibers). In subsequent work, forced-flow thermal-gradient chemical vapor infiltration was used to produce a single composite plate with a multilayer interface from ceramic-grade Nicalon fabric and two plates from Hi-Nicalon fabric, one with a single carbon layer and one with a multilayer interface. Tensile testing of the minicomposites and of specimens cut from the plates revealed typical composite behavior and strengths for the as-processed samples. Exposure of tensile specimens to 950°C air for 100 h resulted in large losses in strength and strain tolerance regardless of the interface coating. The results demonstrate that forced-flow thermal-gradient chemical vapor infiltration can be used to prepare multilayer interface material. The results also verified that relatively thick (>100 nm) single or multiple carbon layers are susceptible to oxidation that causes the loss of composite properties.