| 摘要 |
<p>A mixture containing 35 to 65% by weight of Al2O3, 30 to 60% by weight of SiO2, 1.5 to 4% by weight of Cr2O3, and 0.01 to 0.1% by weight of carbon, the balance being unavoidable impurities, is melted, and amorphous fibers are formed from said molten material by blowing or spinning. The fibers are heated rapidly to a temperature of 950 DEG C. to 1,150 DEG C., held at that temperature for several to about a dozen minutes, and cooled rapidly to ordinary room temperature.</p> |
