Article ID Journal Published Year Pages File Type
1459542 Ceramics International 2016 11 Pages PDF
Abstract

The tension–tension fatigue behavior of a PIP Silicon Carbide/Silicon Carbide (SiC/SiC) composite was investigated at 1300 °C in air. The composite consisted of a new precursor polymer (LPVCS) pyrolyzed SiC matrix reinforced with pyrolytic carbon (PyC) coated 3D braided KD-I SiC fibers. Environmental barrier coatings (EBC) were employed to enhance the durability and air oxidation resistance of the composite at high temperature. Tension–tension fatigue tests were conducted at 1300 °C in laboratory air at frequency of 1 Hz. The ratio of minimum stress to maximum stress was 0.1, with maximum stresses ranging from 40 to 120 MPa. Fatigue run-out was defined as 105 cycles. Strain accumulation with cycles and modulus evolution with cycles were analyzed for each fatigue test. Fatigue limit of SiC/SiC composite with EBC was 60 MPa which was slightly higher than that without EBC. The microstructure as well as damage and failure mechanisms of the composites were investigated.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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