Joining of Carbon—Carbon Composites Using Boron and Titanium Disilicide Interlayers
The feasibility of joining of 3-D carbon—carbon (C–C) composites by using B and TiSi2 interlayers has been investigated. The optimum temperature for joining with a B interlayer was determined to be about 1995°C and that for joining with a TiSi2 interlayer was about 1490°C. The shear strengths of the joints made at these optimum temperatures were found to increase with the shear testing temperature up to a point, followed by a decrease at higher temperatures. For C–C specimens bonded at 1995°C with a B interlayer, the maximum joint shear strength (average value 18.35 MPa) was observed at the test temperature of 1660°C. The shear strength of joints produced with a TiSi2 interlayer showed a maximum at the test temperature of 1164°C, with an average value of 34.41 MPa. The B interlayers reacted with C–C composite pieces during joining, and the product of reaction was identified as B4C. In specimens joined with TiSi2 interlayers, the reaction between TiSi2 and C did not go to completion, and the bond interlayer contained TiC, SiC, and TiSi2.
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