Thermal and microstructural stability of the glass ceramic matrix composites
Başlık çevirisi mevcut değil.
- Tez No: 400283
- Danışmanlar: PROF. ROY TAYLOR
- Tez Türü: Doktora
- Konular: Metalurji Mühendisliği, Metallurgical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1998
- Dil: İngilizce
- Üniversite: University of Manchester Institute of Science and Technology (UMIST)
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Malzeme Bilimi ve Makine Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 247
Özet
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Özet (Çeviri)
A study has been conducted of the microstructure and thermal behaviour of a glassceramic composite material, consisting of a Barium osumilite glass ceramic (BMAS) reinforced with SiC (Tyranno) cross ply (0°, 90°) and a Magnesium aluminium silicate (MAS) reinforced with SiC Nicalon cross ply (0°, 45°, 90°) continuous fibres. Several techniques were used, thermal diffusivity, thermal expansion. The materials used in this investigation were heat treated in inert and oxidising atmospheres in the temperatures in the range 600-1200 °C for 1-300 hours.X-ray diffraction analysis was carried out on all ?as received? and heat treated materials. Microstructural examination was carried out using optical, scanning and transmission electron microscopy on the as received and thermal exposure materials, and on the mechanical damaged materials. Special attention was paid to the interfacial regions of heated composites.During the investigation of microstructural and thermal properties, it has been found that interfacial degradation occurs at the lower temperature heat treatment temperatures of 600-800 °C. This is attributed to the fact that, at those heat treatment temperatures the carbon rich layer formed during processing is oxidised away leaving voids between fibre and matrix which are linked by isolated silicon rich bridges. After heat treatment at higher temperatures 1000-1200 °C, the thermal properties are retained or even enhanced and it was found that the interfacial layer even thickened. The results are similar to the findings of other investigations of the effect of heat treatment which have concentrated on the effect on mechanical properties. This investigation shows that thermal diffusivity measurements in particular can also be used to monitor microstructural changes due to thermally exposed and mechanically damaged materials.
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