| 摘要 |
<p>A filament containing not less than 80 wt.% acrylonitrile is (1) heated in air, oxygen enriched air, or other oxidising atmosphere to a temperature between 200 degrees C-300 degrees C pref. over a period of between 1-6 hrs; (2) heated to not 1000 degrees C in an inert atmosphere at a rate which includes a constant temperature heating pref. for half-an-hour, in the range 400 degrees C-625 degrees C, (3) carbonised at the final temperature is not 1000 degrees C.</p> |
