【百家大讲堂】第208 期：自愈合热障涂层的制备与表征

【百家大讲堂】第208 期：自愈合热障涂层的制备与表征

　　讲座题目： 自愈合热障涂层的制备与表征

　　报  告 人： Denise Koch

　　时  　 间：2019年5 月31 日 上午 9:0 0-11 : 00

　　地  　 点：5号教学楼502-1 

　　主办单位：研究生院、 材料学院

　　报名方式：登录乐动（中国）微信企业号---第二课堂---课程报名中选择“【百家大讲堂】第 208期：自愈合热障涂层的制备与表征 ”

 

【主讲人简介】

 主讲人简介（中文）

Denise Koch,德国Julich研究所，能源与气候研究所（IEK-1）博士。自2016年起，从事自愈热障涂层的制备与研究，与西安交通大学合作，承担国家项目中新型热障材料（如GZO）的性能研究课题，以及国际项目中悬浮等离子喷涂（SPS）形成的微观结构。

主讲人简介（英文）

Denise Koch was born in Jena, Germany in 1988. She received her Master’s degree (M. Sc.) in Chemistry from RWTH Aachen University and received her Ph.D. degree in Engineering from the Institute for Energy and Climate Research (IEK-1) at ForschungszentrumJulichin. Since then, she studies on the manufacturing of self-healing thermal barrier coating, investigating the performance of new TBC-materials such as GZO within a national project and also the microstructure established by Suspension Plasma Spraying (SPS) within an international Project in cooperation with Xi’an Jiaotong University.

 

 

【讲座内容简介】

由于燃气轮机提高效率和负载灵活性的目标是工业应用的关键目标之一，因此对用于发动机的热障涂层（TBC）的要求也在不断提高。一种提高热障涂层寿命的方法是在涂层中添加功能材料，例如自愈合成分，即可以重新密封工作过程中出现的裂缝。二硅化钼（MoSi2）是一种有前途的愈合剂。MoSi2和Yttria稳定氧化锆（YSZ）同时喷涂，是目前最先进的TBC材料，由于MoSi2的熔化温度低于YSZ，并且在喷涂过程中伴有Si的蒸发，所以这种涂层在制备上极具挑战性。当使用特定的两点注射系统进行加工时，两种材料都可以在不分解的情况下沉积。这种方法制备的涂层，MoSi2在TBC运行期间氧化，从而修复裂纹，从而避免TBC的失效。炉子循环试验和实际的燃烧器台架梯度试验表明，这种方法延长了TBC寿命。

内容简介（英文） As the aim for a higher efficiency and improved load flexibility of gas turbines is one of the key-goals for industrial use, the demands on thermal barrier coatings (TBCs) for engine applications are rising. These can only be achieved by significantly increasing the performance of TBCs. One approach to increase the lifetime of TBCs is the addition of functional materials to the coating itself. For example a self-healing agent that can reseal cracks that occur during operation. Molybdenum disilicide (MoSi2) is a promising healing agent. The simultaneous spraying of MoSi2 and the yttria-stabilized zirconia (YSZ), which is the state of the art material for TBCs, is highly challenging, as the melting temperature of MoSi2 is lower than that of YSZ and during spraying Si can evaporate leaving only Mo deposited in the coating. When processed with a certain two point injection system, both materials can be deposited without decomposition. The MoSi2 oxidizes during the operation of the TBC which heals cracks that otherwise would lead to the failure of the TBC. Furnace cycling test and more realistic burner-rig gradient tests show increased TBC lifetimes for this approach.