Evaluation of Metal–Ceramic Composite Joint Under Tensile Loads at Elevated Temperature
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An experimental study was undertaken to understand the tensile behavior of metal–ceramic composite joint with bolted configuration. Nickel based super alloy (GTM-Su-263) and SiCf/SiC composite were the material systems with an aerospace grade MJ6 bolt of GTM-Su-718. This bolted assembly was pulled at temperatures 25, 600 and 750 °C which were likely to be experienced in a typical aero engine. In case of metal–ceramic composite joint, the net tensile stress decreased from 110 to 88 MPa with increase in temperature from 25 to 600 °C. Similarly, the bearing stress reduced from 146 to 118 MPa. In all the metal–ceramic composite joints, the fracture initiated at the hole edge experienced the maximum tensile stresses. With further increase in temperature, reduction in the net tensile and bearing strength was significant and was attributed to the oxidation of the interface between the fiber and matrix. SEM studies clearly suggested that debonding and fiber pullout resulted in inferior tensile strength properties at elevated temperatures.
KeywordsCeramic matrix composite Nickel super alloy Tensile strength Bearing strength
The authors would like to thank The Director, Gas Turbine Research Establishment, Bangalore and Director, CSIR-National Aerospace Laboratories, Bangalore for their constant support for carrying out the work. The authors thank Dr. S. Ramachandra, Scientist, Gas Turbine Research Establishment, Bangalore for his valuable suggestions during the execution of the work.
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