Microstructure evolution and phase transformation of TiB₂/SiC/B₄C composites synthesized from Ti‐SiC‐B₄C ternary system

Abstract

Bulk TiB2/SiC/B4C composites have been synthesized from Ti‐SiC‐B4C ternary system with different Ti weight percentages via reactive hot pressing at 1800°C under an applied pressure of 30 MPa for 1.5 h. By Ti amount increasing, the flexural strength curve exhibited an “M‐like” tendency reaching the maximum value of 512.36 MPa for 30 wt.% Ti. Microstructural evolution of the composites from conterminously large matrix grains to finely clear‐edged particles was observed by scanning electron microscopy. The phase transformation and element diffusion were analyzed by XRD and Energy Disperse Spectroscopy. A hybrid reinforcing mechanism of fracture and crack deflection is proposed to illustrate the change in flexural strength.

Recent progress in B4C–SiC composite ceramics: processing, microstructure, and mechanical properties

“…B 4 C–SiC binary ceramics exhibit better sinterability and mechanical properties than pure B 4 C and SiC ceramics. Recently, the performance of ternary or quaternary systems based on B 4 C–SiC binary ceramics has attracted much attention, such as B 4 C–SiC–TiB 2 , 193–205 B 4 C–SiC–CrB 2 , 206 B 4 C–SiC–NbB 2 , 207 B 4 C–SiC–MoB 2 , 208 B 4 C–SiC–HfB 2 , 209,210 B 4 C–SiC–ZrB 2 , 211,212 B 4 C–SiC–WC, 213 B 4 C–SiC–Al 2 O 3 , 214 B 4 C–SiC–rGO, 215 B 4 C–SiC–carbon nanotubes, 216 B 4 C–SiC–carbon fiber, 217 B 4 C–SiC–Si, 218,219 B 4 C–SiC–Mo, 220 B 4 C–SiC–Al, 221–223 B 4 C–SiC–Al 2 O 3 –MgB 2 , 224 and B 4 C–SiC–Si–TiB 2 . 225 The demand for B 4 C–SiC with good performance promotes further exploration of new materials of ternary or quaternary systems with improved properties based on B 4 C–SiC binary ceramics.…”

Optimization of the decarbonizing ratio of boron carbide powders by reverse flotation using response surface methodology

“…Therefore, it has been widely used in the grinding of hard materials, the manufacture of lightweight and super hard materials and the nuclear industry. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Currently, the main method for preparing B 4 C is carbothermal reduction.…”