High-temperature strength and toughness behaviors for reaction-bonded SiC ceramics below 1400 °C

Toughening and strengthening of ceramics composite through microstructural refinement

“…Silicon-carbide (SiC)-based ceramics are very promising high-temperature structural materials owing to their excellent thermal and mechanical properties [1]. However, monolithic SiC is a highly covalently bonded silicon and carbon compound that is difficult to densify [2], and its low resistance to fracture has impeded its widespread application.…”

Amorphization and C segregation based surface generation of Reaction-Bonded SiC/Si composites under micro-grinding

“…Silicon carbide is one of the extensively used engineering materials for its high hardness and strength, corrosion resistance and chemical stability at high temperature [1][2][3]. To densify and improve toughness of bulk materials, the Reaction-Bonded SiC with remnant Si can be used.…”

“…To densify and improve toughness of bulk materials, the Reaction-Bonded SiC with remnant Si can be used. Besides, the chemical reactions between Si and C can also improve the boundary strength of the composites [3]. Nevertheless, the application of RB-SiC/Si is impeded by the difficulty of machining engineering SiC parts with high form accuracy and good surface integrity.…”

“…However, experimental results have shown that high temperature and pressure in the machining process would deteriorate the surface finish, including surface roughness [4][5][6], phase transformation [7,8], subsurface cracks and residual stress [9,10]. They could produce detrimental impacts on the microstructure of RB-SiC/Si composites jointly [3,11,12]. Besides, a transition layer with C/Si ratio more than 1 and C segregation would occur on SiC surface at elevated temperature during machining [13], which would seriously aggravate the surface strength.…”

Impact of material microstructure and diamond grit wear on surface finish in micro-grinding of RB-SiC/Si and WC/Co carbides

“…To densify the bulk materials and increase the toughness, suitable amount of remnant Si and Co is added to SiC and WC, respectively [5][6][7].…”