IEST - Institute of Energy Science and Technology -

Advanced SiC/SiC Composites by NITE Process

Cera-NITE®

Product information

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Thermal Loading / Thermal Shock Resistance and Oxidation Resistance

Owing to the well controlled microstructure with the similar crystal grain size in both matrix and fibers, Cera-NITE presents excellent thermal loading/thermal shock resistance. The very severe thermal cycling test done at Nagasaki Works, Mitsubishi Heavy Industries, is an good example. 1350 C heating for 125 second by burning gas flame followed by the quick quenching by cool air caused cracking before 50cycles for the case of advanced PIP-SiC/SiC developed by Japanese national program from 1991 to 2000, whereas the first product from Pilot Grade Cera-NITE at Ube Industries had no detectable cracks after 100 cycles and showed no mechanical property degradation (Shown in Fig. 3). Thermal stress figure of merit for Cera-NITE is outstanding from room temperature to 1600C and higher, is beating almost all high temperature structural materials in this temperature range. The high dense matrix of Cera-NITE prevents the oxidation of carbon interface which gives higher resistance to oxidation of SiC/SiC composites.

AMG-Grade PIP-SiC/SiC
PIP SiC/SiC Liner:
Formation of SiO2 due to the oxide impurities inside the SiC fiber and matrix.
*Brittle fracture before 50 cycles

Pilot grade #1 NITE-SiC/SiC
NITE SiC/SiC Liner:
Excellent thermal conductiveity and excellent total properties,excellent M,made It very resistant to thermal shock.
*No crack at least in 100 cycles

(Fig.3 : Very Severe Thernmal Cycling Test Results)