UÇAK MOTORU UYGULAMALARINDA ALTERNATİF ÇÖZÜMLER: MoSi2 ESASLI MALZEMELERİN YAPISAL ELEMAN OLARAK KULLANIMI

MoSi2 esaslı malzemeler, yüksek sıcaklıklardaki oksijen zengini ortamlarda zorlayıcı koşullara karşı gösterdikleri mükemmel dayanımları ve süperalaşımlara oranla sahip oldukları düşük yoğunluk sebebiyle, özellikle havacılık uygulamalarındaki uçak motoru parçaları için yapısal eleman olarak kullanılmaya aday özelliktedir. Çalışmada, öncelikle geleneksel uçak motoru yapısal malzemeleri uygulamalarındaki başlıca kısıtların verilmesinin ardından, MoSi2’nin temel mekanik ve fiziksel özelliklerinin analizi gerçekleştirilmiş ve yapısal yüksek sıcaklık uygulamalarındaki en önemli unsurlar olarak kabul edilen oksidasyon ve ısıl şok özellikleri incelenmiştir. Malzemenin Si3N4 ile oluşturduğu çeşitli kompozit yapıların, kırılma tokluğu değerlerini ve servis koşullarındaki ortalama sıcaklıklarda (~500°C) oksidasyon dayanımını büyük oranda iyileştirdiği ortaya konmuştur. Elde edilen veriler değerlendirildiğinde, MoSi2 esaslı malzemelerin mekanik kabiliyetlerinin gelişen teknolojiye bağlı olarak uçaklardan istenen hız/performans/maliyet kriterlerini karşılayabileceği görülmektedir.

Anahtar Kelimeler:

Molibden disilisit, oksidasyon dayanımı, süperalaşımlar, kırılma tokluğu, uçak motoru

ALTERNATIVE SOLUTIONS IN AIRCRAFT ENGINE APPLICATIONS: USAGE OF MoSi2 BASED MATERIALS AS STRUCTURAL ELEMENTS

MoSi2 based composites are candidate materials which can be used as structural elements in oxygenrich atmospheres especially in aircraft applications for their excellent mechanical properties and low density against agressive conditions at high temperatures. In this study, after giving some limits of traditional structural aircraft engine materials, essential mechanical and physical properties of MoSi2 were analysed. Oxidation and thermal shock behaviors (which are considered to be the most important factors in structural high temperature applications) were also determined. It was showed that low fracture toughness and pest oxidation at average temperatures (~500°C) can be easily eliminated by additions of Si3N4 in different portions to the material. The obtained data proves that mechanical abilities of MoSi2 based materials can respond to speed/performance/cost requirements of aircraft technologies.

Keywords:

Molybdenum disilicide, oxidation resistance, superalloys, fracture toughness, aircraft engine,

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ISSN: 1300-3402
Yayın Aralığı: Yılda 4 Sayı
Başlangıç: 1957
Yayıncı: TMMOB MAKİNA MÜHENDİSLERİ ODASI

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