Creep behavior of SiC whisker-reinforced Si3N4/BN fibrous monolithic ceramics

Advanced Fabrication Method and Mechanical Properties of Silicon Nitride/Boron Nitride Fibrous Monolithic Ceramics

“…Consequently, the fracture toughness of silicon nitride ceramics prepared using this method is significantly improved, reaching 11.1 MPa·m 1/2 . Previous studies primarily focused on incorporating β -Si 3 N 4 rod-like seeds [ 9 , 10 ] or SiC whiskers [ 14 , 15 , 16 ] into Si 3 N 4 fibers. However, the debinding process in these studies was conducted in an inert atmosphere, which, while enhancing the mechanical properties of Si 3 N 4 /BN fibrous monolithic ceramics, adversely affects their transparency to waves.…”

“…Si 3 N 4 /BN fibrous monolithic ceramics comprise a principal phase (Si 3 N 4 units) and an interfacial phase (BN unit interfaces), and are known for their strength, wave transparency, chemical stability, and temperature resilience [9][10][11][12][13][14][15][16][17]. Notably, cracks in these ceramics tend to propagate along the unit interfaces, requiring higher fracture energy, such as through crack deflection or branching.…”

Microstructure and Mechanical Properties of Sintered Fibrous Monolith Cemented Carbide

“…The FM structure is particularly suitable for brittle materials to modify its poor fracture toughness, for the tough shell can slow down or even prevent the crack propagating. The typical representation is the FM Si 3 N 4 /BN ceramic with its fracture toughness effectively improved [4][5][6][7][8].Similarly, WC-Co cemented carbides, as another kind of brittle materials, possess poor fracture toughness either, so some researchers are setting about introducing the FM structure into WC-Co cemented carbides for increasing its fracture toughness [9][10][11].…”