کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1464814 | 989671 | 2007 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: High strength three-dimensional silica fiber reinforced silicon nitride-based composites via polyhydridomethylsilazane pyrolysis High strength three-dimensional silica fiber reinforced silicon nitride-based composites via polyhydridomethylsilazane pyrolysis](/preview/png/1464814.png)
Three-dimensional silica fiber reinforced silicon nitride-based composites were fabricated through polyhydridomethylsilazane pyrolysis at 500–600 °C in flowing anhydrous ammonia atmosphere. The characteristics of the precursor-derived product, the mechanical properties and microstructures of the composites were investigated by FT-IR, elemental analysis, XRD, flexural strength and SEM. The polymer-derived product was a low-carbon near ceramic material with an empirical formula of Si1.0N1.38C0.01O0.04H0.78. Due to the low viscosity and high ceramic yield of the precursor, the as-received composites exhibited a relatively high density of 1.73 g/cm3 after four infiltration–pyrolysis cycles. The composites were amorphous, showing a high flexural strength of 114.5 MPa and a non-brittle failure behavior. It was the controlled fiber/matrix interface that ensured the reinforcement ability of the silica fibers and the high strength of the composites.
Journal: Ceramics International - Volume 33, Issue 5, July 2007, Pages 891–894