Abstract
The fiber/matrix interfacial shear strength of Textron SCS‐6 SiC‐fiber‐reinforced reaction‐bonded Si3N4 (RBSN) was studied as a function of temperature after oxidation for 24 h at 600°C. Fiber push‐out experiments were conducted using a diamond indenter in a high‐temperature micro‐hardness tester under vacuum. The interfacial shear strength increased with temperature because of the relief of residual tensile stresses arising from the difference in thermal expansion coefficients between the fiber and the matrix. Most of sublayer 2 of the fiber outer coating, which mainly consisted of carbon in the form of BSU (basic structure unit) aggregates, had disappeared after the heat treatment of the composite. Oxidation resulted in severe changes in the fiber outer coating and caused a lower interfacial shear strength with respect to that of the unoxidized composite.
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