Preparation of Continuous Aluminum Oxide Fibers with Silicon Oxide and Zirconium Oxide Additives

Abstract

Ceramic oxide fibers have low heat conductivity and high heat stability along with low density such that these materials are in demand for high-temperature thermal insulation. However, the creep of oxide fibers at high temperatures limits their use as composite components. We studied the crystallization of oxide fibers with the following compositions (in mass %): 1) 85% Al3O3 + 15% SiO2, 2) 90% Al2O3 + 10% SiO2, and 3) 95% Al2O3 + 4% ZrO2 + 1% Y2O3. The fibers were subjected to heat treatment at 700°, 900°, and 1280°C and we studied their phase composition and strength properties. The greatest tensile strength was found for the first fiber but all the samples showed a tendency for granule growth and loss of strength by the action of high temperatures. Further investigation required to explore possible use of other precursors and the effect of technological conditions on the formation and crystallization of such fibers.