Ferrosilicochromium-Filled Polymer-Derived Ceramics

摘要

Rectangular green bodies fabricated from a granulated mixture of polymethylsilsesquioxane (PMS), ferrosilicochromium (FeSiCr), and SiC were cross-linked in a warm press at 240℃ under a pressure of 9 MPa. The samples were then pyrolyzed at 950℃ and subsequently heat treated at 1275℃ 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.