SBIR PHASE I: Combustion Chemical Vapor Deposition Processing of Lanthanum Phosphate and Beta-Alumina Fiber Coatings for Mullite Matrix Composites

这个小型企业创新研究第一阶段项目将展示燃烧化学气相沉积（CCVD）的能力，以低成本沉积高质量的磷酸镧和β -铝酸盐薄膜，用于复合材料应用。将进行一系列的运行研究，以优化工艺并证明再现性。在这个项目中，磷酸镧和β -氧化铝薄膜将使用CCVD在平面基底和纤维上生长。薄膜的组成、形态、微观结构和机械性能将作为沉积条件的函数来确定。燃烧化学气相沉积（CCVD~M）是目前唯一的开放式气相沉积技术。CCVD方法已被证明以低成本和快速的方式连续应用致密、粘附、外延薄膜。该技术可用于生产磷酸镧和-铝酸盐涂层热结构复合纤维，以提高莫来石基复合材料的稳定性和增韧性能。CCVD法具有成本低、质量高、通用性强等优点。它不需要反应室或炉，但所生产的薄膜在质量上与CVD膜相当，并且允许纤维很容易地通过沉积区，用于多层生产线涂层。该公司在开放气氛中使用CCVD生产了许多材料的CVD质量薄膜。这使得易于处理纤维束，这是其他现有涂层技术的主要问题。传统的陶瓷纤维CVD涂层速度慢、难度大、价格昂贵，并且需要专门设计的炉。相比之下，CCVD技术提供了在没有专门设备或环境的情况下涂覆多根纤维的能力。一家大公司对该技术表示了兴趣，以生产低成本，高质量的磷酸镧和β -铝酸盐薄膜，用于高温防护和莫来石基复合材料中的结构复合材料。由于这些原因，CCVD技术在开发风扇叶片、气缸刀片、制动转子和相关应用的复合材料方面处于有利地位。＊＊＊

*** 9561712 Hunt This Small Business Innovation Research Phase I project will demonstrate the ability of Combustion Chemical Vapor Deposition (CCVD) to inexpensively deposit high quality lanthanum phosphate and beta-aluminate thin films for use in composite applications. A series of run studies will be performed to optimize the process and demonstrate reproducibility. In this project, thin films of lanthanum phosphate and beta-alumina will be grown onto flat substrates and fibers using CCVD. The composition, morphology, microstructure, and mechanical properties of the films will be determined as a function of deposition conditions. Combustion Chemical Vapor Deposition (CCVD~M) is the only open atmosphere CVD technique for ceramics. The CCVD method has been shown to inexpensively and quickly apply dense, adherent, epitaxial thin films in a continuous manner. This technology can be used for the production of lanthanum phosphate and beta-aluminate coated thermostructural composite fibers for stability and toughened behavior in mullite matrix composites. The CCVD method is low cost, high quality and versatile. It does not require a reaction chamber or furnace, yet the thin films produced are comparable in quality to CVD films, and allows fibers to be easily passed through a deposition zone for multi-layered, production line coatings. This firm has produced CVD quality films of numerous materials using CCVD in the open atmosphere. This allows for easy handling of fiber tows which is a major problem for other existing coating techniques. Traditional CVD coating of ceramic fibers is slow, difficult and expensive, and requires a specially designed furnace. In contrast, the CCVD technology offers the ability to coat multiple fibers without specialized equipment or environments. A large corporation has expressed interest in this technique for the production of low cost, high quality lanthanum phosphate and beta-aluminate films on fibers for high temperature protective and structural composites in mullite matrix composites. For these reasons, the CCVD technology is well-positioned to be used in the development of composites for fan blades, cylinder inserts, brake rotors and related applications. ***