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Polyfunctional Interface Coatings for High Temperature Resistant Ceramic Composite of SiC/SiC Type

机译：SiC / SiC型耐高温陶瓷复合材料的多功能界面涂层

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摘要

preliminary results are presented of fabricating protective MoSi2 coating and so called `"rheological" SiC coating on both SiC/C and SiC-coreless fibres. The study is carried out in order to solve one of the major problems in creating a high oxida- tion resistant ceramic matrix composites (CMC) of SiC/SiC type for a long work at 1800 - 2100 K. Chemical vapour depo- sition (CVD), reactive vapour deposition (RVD) and preceramic polymer deposition (PPD) were explored. The fibres of Nicalon and SiC/C types were coated. CVD protective coatings deposited under mild regime (< 1100 K ) in the system of Mo(CO)6 and SiH4 had a multiphase composition: Mo5i3, Mo5Si3, Si and Mo were identified by XRD. A consecutive depo- sition of Mo- and Si-layers followed by a heat treatment demonstrated the impossibility of coating the Nicalon first with Mo-layer. Molybdenum disappeared quickly at heat treatment working temperatures due to interaction with initial oxygen of coreless SiC-fibres. The experiments with Hi-Nicalon (not more than 0.8 mass. of O2) are under study now. The best results were got by RVD with SiC/C-fibres, when a layer of Mo was silicided with SiCl4.
机译：给出了在SiC / C和SiC无芯纤维上制造保护性MoSi2涂层和所谓的“流变” SiC涂层的初步结果。进行这项研究是为了解决在1800-2100 K的长期工作中创建SiC / SiC型高抗氧化陶瓷基复合材料（CMC）的主要问题之一。化学气相沉积（CVD） ），反应性气相沉积（RVD）和陶瓷前聚合物沉积（PPD）。涂覆了Nicalon和SiC / C型纤维。 Mo（CO）6和SiH4体系中在温和条件下（<1100 K）沉积的CVD保护涂层具有多相组成：XRD鉴定了Mo5i3，Mo5Si3，Si和Mo。连续沉积Mo和Si层，然后进行热处理，证明不可能先在Nicalon上涂Mo层。由于与无芯SiC纤维的初始氧相互作用，钼在热处理工作温度下迅速消失。现在正在研究用Hi-Nicalon（不超过0.8质量的O2）进行的实验。当用SiCl4对一层Mo进行硅化处理时，采用SiC / C纤维的RVD可获得最佳结果。

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