Abstract
Abstract : In prior work, the synthesis of alpha, beta, and gamma-Re2Si2O7 powders (Re= Y and Ho) at temperatures from 1000 degrees to 1400 degrees C h in air was reported, along with the Vickers hardness of dense gamma-Y2Si2O7 and gamma-Ho2Si2O7 polymorphs. Dense gamma-Y2Si2O7 and & gamma-Ho2Si2O7 pellets were made by a pressureless sintering technique at 1400 degrees C/8h. Using the pressureless sintering technique, densification of alpha and beta-Y2Si2O7 powder compacts at their phase formation temperature (1000 degrees C - 1200 degrees C) was not successful and prevented the determination of their hardness values. In this work, the field assisted sintering technique (FAST) was used to form dense alpha, beta and gamma-Y2Si2O7 pellets at a pressure of 20KN and temperatures of 1050 degrees C to 1200 degrees C. Subsequently, their Vickers hardness was measured. SCS-0 fibers were also incorporated into alpha, beta and gamma-Re2Si2O7 matrices and densified at 1050 degrees C to 1200 degrees C/1 h using the FAST approach. Fiber push-out experiments were conducted, and the average sliding stress values were determined.
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