【百家大講堂】第208 期：自愈合熱障涂層的制備與表征

　　講座題目： 自愈合熱障涂層的制備與表征

　　報(bào)  告 人： Denise Koch

　　時(shí)  　 間：2019年5 月31 日 上午 9:0 0-11 : 00

　　地  　 點(diǎn)：5號(hào)教學(xué)樓502-1 

　　主辦單位：研究生院、 材料學(xué)院

　　報(bào)名方式：登錄北京理工大學(xué)微信企業(yè)號(hào)---第二課堂---課程報(bào)名中選擇“【百家大講堂】第 208期：自愈合熱障涂層的制備與表征 ”

 

【主講人簡(jiǎn)介】

 主講人簡(jiǎn)介（中文）

Denise Koch,德國(guó)Julich研究所，能源與氣候研究所（IEK-1）博士。自2016年起，從事自愈熱障涂層的制備與研究，與西安交通大學(xué)合作，承擔(dān)國(guó)家項(xiàng)目中新型熱障材料（如GZO）的性能研究課題，以及國(guó)際項(xiàng)目中懸浮等離子噴涂（SPS）形成的微觀結(jié)構(gòu)。

主講人簡(jiǎn)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.

 

 

【講座內(nèi)容簡(jiǎn)介】

由于燃?xì)廨啓C(jī)提高效率和負(fù)載靈活性的目標(biāo)是工業(yè)應(yīng)用的關(guān)鍵目標(biāo)之一，因此對(duì)用于發(fā)動(dòng)機(jī)的熱障涂層（TBC）的要求也在不斷提高。一種提高熱障涂層壽命的方法是在涂層中添加功能材料，例如自愈合成分，即可以重新密封工作過(guò)程中出現(xiàn)的裂縫。二硅化鉬（MoSi2）是一種有前途的愈合劑。MoSi2和Yttria穩(wěn)定氧化鋯（YSZ）同時(shí)噴涂，是目前最先進(jìn)的TBC材料，由于MoSi2的熔化溫度低于YSZ，并且在噴涂過(guò)程中伴有Si的蒸發(fā)，所以這種涂層在制備上極具挑戰(zhàn)性。當(dāng)使用特定的兩點(diǎn)注射系統(tǒng)進(jìn)行加工時(shí)，兩種材料都可以在不分解的情況下沉積。這種方法制備的涂層，MoSi2在TBC運(yùn)行期間氧化，從而修復(fù)裂紋，從而避免TBC的失效。爐子循環(huán)試驗(yàn)和實(shí)際的燃燒器臺(tái)架梯度試驗(yàn)表明，這種方法延長(zhǎng)了TBC壽命。

內(nèi)容簡(jiǎn)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.