Advances in SiC Fibers for High Temperature Applications |
| Journal |
Advances in Science and Technology (Volume 50) |
| Volume |
Advanced Inorganic Fibrous Composites V |
| Edited by |
P. VINCENZINI and M. SINGH |
| Pages |
17-23 |
| DOI |
10.4028/www.scientific.net/AST.50.17 |
| Online since |
October, 2006 |
| Authors |
Hiroshi Ichikawa
|
| Keywords |
Ceramic Matrix Composite (CMC), Hi-Nicalon, Nicalon, SiC Fiber, Type S |
| Abstract |
The oxygen free SiC fiber (Hi-Nicalon) has been commercially produced by an electron
beam curing process. And then the SiC fiber (Hi-Nicalon Type S) having stoichiometric SiC
composition and high crystallinity has been developed.
Hi-Nicalon fiber has higher elastic modulus and thermal stability than Nicalon fiber. The Type S
fiber has the highest elastic modulus and thermal stability and excellent creep resistance in three
types of Nicalon fibers.
Recently，Type S fibers as industrial products have been developed and put on the market.
The Type S fibers have a high tensile strength of 2.8 GPa, a high elastic modulus of 390 GPa.
Against thermal exposure, Type S retains a tensile strength of 2.3 GPa and hardly changes its elastic
modulus even at 1873K. Moreover, Type S has outstanding creep resistance. Type S shows higher
stress relaxation ratio than many other ceramic fibers after thermal exposure over 1673K.
Now, Hi-Nicalon Type S fiber/BN/SiC composites are being developed as the components of gas
turbine for aerospace and land based power generation such as shrouds and combustors.
Type Hi-Nicalon S can be supplied about 30 kg per a month at present. |
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