| 摘要 |
<p>Transparent refractory fibers, at least 50 percent thoria and additionally containing silica and metal(III) oxides, particularly Al2O3 and B2O3 or Cr2O3 are made by shaping and dehydratively gelling, particularly by extruding in air, viscous aqueous thoria solutions or sols containing colloidal silica with boric acid-stabilized aluminum acetate, or additionally chromium acetate or colloidal Cr2O3, and heating the resulting gelled fibers in a controlled manner to decompose and volatilize undesired constituents and convert fibers to refractory fibers which are useful to form, for example, refractory fabrics, or as reinforcement for composites.</p> |
