Ferrosilicochromium‐Filled Polymer‐Derived Ceramics

Abstract

Rectangular green bodies fabricated from a granulated mixture of polymethylsilsesquioxane (PMS), ferrosilicochromium (FeSiCr), and SiC were cross‐linked in a warm press at 240°C under a pressure of 9 MPa. The samples were then pyrolyzed at 950°C and subsequently heat treated at 1275°C in N 2 atmosphere at pressures up to 5 MPa. For the composites with 25 vol% FeSiCr, a total linear shrinkage of <7% was measured while the residual porosity decreased to 3%. A bending strength of ∼285 MPa, fracture toughness of ∼3.7 MPa m 1/2 , hardness of ∼9.5 GPa, and elastic modulus of ∼186 GPa were evaluated.