Abstract
Pulsed laser irradiation and ion beam mixing of thin Ni overlayers on sintered a-SiC have been investigated as potential surface modification techniques for the enhancement of the mechanical properties of the SiC. Each of these surface processing methods are non-equilibrium techniques; materials interactions can be induced at the specimen surface which are not possible with conventional thermal techniques. As a result of the surface modification, the physical properties of the ceramic can be altered under the correct processing conditions. Following laser irradiation using a pulsed ruby or krypton fluoride (KrF) excimer laser, the fracture strength of the SiC was increased by approximately 50% and 20%y respectively. However, ion beam mixing of Ni on SiC resulted in no change in fracture strength. Cross-sectional transmission electron microscopy (X-TEM), scanning electron microscopy (SEM), secondary ion mass spectroscopy (SIMS), and Rutherford backscattering techniques (RBS) have been used to characterize the extent of mixing between the Ni and SiC as a result of the surface modification and to determine the reason(s) for the observed changes in fracture strength.
Published Version
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