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Potential of innovative ceramics for turbine applications

机译:用于涡轮机的创新陶瓷潜力

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Improving the thermal efficiency of aircraft gas turbines and of thermal power generation systems is of great interest for industry. Despite the various studies performed to increase their heat resistance, the use of nickel-based superalloys at temperatures beyond 1150 degrees C will be difficult. For higher temperatures, new high-temperature structural materials are required. In this context, ceramics offer many advantages compared to Ni-based superalloys: a lower density and a better resistance to oxidation and abrasion. Two kinds of ceramics are investigated at ONERA: Si3N4-based materials for use up to 1400-1500 degrees C and directionally solidified eutectic (DSE) ceramics up to 1700 degrees C. For both materials, improving toughness is a challenge. This paper presents the processing techniques, the microstructural features and the resulting mechanical properties.
机译:提高飞机燃气轮机和热力发电系统的热效率是工业界的极大兴趣。尽管进行了各种研究来提高其耐热性,但是在超过1150摄氏度的温度下使用镍基高温合金仍然很困难。对于更高的温度,需要新的高温结构材料。在这种情况下,与镍基高温合金相比,陶瓷具有许多优势:较低的密度以及更好的抗氧化和耐磨性。在ONERA上研究了两种陶瓷:用于高达1400-1500摄氏度的Si3N4基材料和高达1700摄氏度的定向凝固共晶(DSE)陶瓷。对于这两种材料,提高韧性都是一个挑战。本文介绍了加工技术,微观结构特征以及由此产生的机械性能。

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