Composite silicon carbide/silicon nitride coatings for carbon-carbon materials

Composites ◽  
1985 ◽  
Vol 16 (4) ◽  
pp. 344
Keyword(s):  
Silicon Carbide ◽  
Silicon Nitride ◽  
Carbon Materials ◽  
Nitride Coatings ◽  
Composite Silicon

Processing and Creep Performance of Silicon Carbide Whisker-Reinforced Silicon Nitride

1986 ◽  
Vol 78 ◽  
Author(s):  
John. R. Porter ◽  
F. F. Lange ◽  
A. H. Chokshi
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Silicon Nitride ◽  
Room Temperature ◽  
Full Density ◽  
X Ray Diffraction ◽  
Polycrystalline Alumina ◽  
Silicon Carbide Whisker ◽  
Transmission Electron ◽  
Composite Silicon

ABSTRACTSilicon carbide whisker reinforcement can significantly reduce creep rates in polycrystalline alumina [1], but the system SiC/Al2O3 is thermodynamically unstable in air and oxidizes to mullite during creep testing [2]. The system SiC/Si3N4 was investigated as a potentially more stable, high temperature structural composite. Silicon carbide whiskers were successfully incorporated into a silicon nitride matrix doped with alumina and yttria. Processing involved mixing dispersed slurries of silicon carbide and silicon nitride, adding the dopants as a solution of their nitrates and subsequently increasing the pH to precipitate the additive hydroxides. The resulting slurries were filter pressed at room temperature and hot pressed at 1650°C in graphite dies to full density. X-ray diffraction and transmission electron microscopy confirmed the presence of β-Si3N4, α-SiC and trace quantities of α-Si3N4, confirming that the α-β Si3N4 reaction occurred. An additional, as yet unidentified, minor phase was also detected.Whisker reinforcement was shown to increase the room temperature flexural strength and fracture toughness but high temperature creep performance was unaffected by whisker reinforcement.

Characteristics of Composite Silicon Carbide Fuel Cladding after Irradiation under Simulated PWR Conditions

2013 ◽  
Vol 183 (1) ◽  
pp. 13-29 ◽  
Author(s):  
John D. Stempien ◽  
David M. Carpenter ◽  
Gordon Kohse ◽  
Mujid S. Kazimi
Keyword(s):  
Silicon Carbide ◽  
Fuel Cladding ◽  
Carbide Fuel ◽  
Composite Silicon
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