Abstract
Directionally solidified SiC-B 4C eutectic formed lamellar microstructures with no colonies if the solidification rate (R) was below 2cm/hr. It was determined that 〈001〉 of B 4C and 〈111〉 of SiC were parallel to the eutectic growth direction, and that the interlamellar spacing was proportional to the inverse square root of solidification rate. The Knoop hardness increased with the increasing solidification rate. The minimum wear was found with compositions close to eutectic. At R ≈ 9cm/hr the most wear resistant specimens were obtained. SiC-B 4C eutectic ingot solidified at approximately 9cm/hr had considerably better wear resistance than solidified B 4C or hot pressed SiC.
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