Effect of high temperature exposure on the tensile strength of alumina fiber Nextel 610

Abstract

The tensile strength of an α-alumina fiber Nextel 610 after exposure to temperatures of 900, 1100 and 1300 °C was determined using a two-parameter Weibull distribution. This investigation showed that the primary reason for the loss of the fiber strength was grain growth. Defects induced during high temperature exposure can be another source for the loss of the fiber strength. The fracture mechanism changed from intergranular with increasing fiber grain size, as a result of increasing exposure temperature.