Abstract
The effects of sintering additives on irradiation swelling and modulus for monolithic NITE SiC was studied using 5.1MeV Si2+ ion irradiation up to 5dpa at 553–1273K. The elastic modulus of NITE SiC decreased less than ∼7% in the highest damage case of 553K, 3dpa, indicating that the additives did not negatively affect the modulus of irradiated NITE SiC. A sample containing 9% additives showed higher swelling rates than high purity CVD SiC at lower temperatures. At 553K, 5dpa, the swelling of NITE SiC (9wt.%) was twice as large as that of CVD SiC. Analysis of the electron diffraction patterns showed amorphization of the secondary phase, which is likely a primary reason for the increased swelling.
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