Low pressure hot pressing of B4C matrix ceramic composites improved by Al2O3 and TiC additives

Effect of spark plasma sintering parameters on microstructure and room-temperature hardness and toughness of fine-grained boron carbide (B4C)

“…In addition, the presence of B 2 O 3 on B 4 C surface slows down the densification process. 7,8 Traditionally, boron carbide has been sintered using (i) pressureless sintering with or without sintering additives in a hydrogen and helium atmosphere, 5,9,10 (ii) hot pressing with and without sintering additives, [11][12][13] (iii) hot isostatic pressing (HIP) 14,15 and (iv) microwave sintering. 16 Among the processing techniques mentioned above, hot pressing and pressureless sintering has been used for industrial fabrication of dense boron carbide simple shapes.…”

“…Such conditions are economically too demanding in terms of energy consuming. [11][12][13] In pressureless sintering process, dense components were achieved at sintering temperatures as high as 2250-2350 • C. 5,9,10 Therefore, many researchers are concentrated on finding new techniques for improving the sinterability and fracture toughness of boron carbide at less demanding conditions. Spark plasma sintering (SPS) has become a popular technology that has the advantage of higher heating rates, lower sintering temperatures and shorter dwell times in comparison with conventional hot pressing.…”

Erosion behavior of B4C based ceramic nozzles by abrasive air-jet

“…Based on the thermodynamic analysis of chemical reactions [7,8], the value of the Gibbs free energy ( DG h T ) of Eq. (1) was less than zero, which indicated that the equation could occur during the sintering process.…”

“…Therefore, the variation of fracture mode contributed to the enhanced mechanical properties for SA10 sample. Higher relative density, more uniform microstructures, mixed fracture mode associated with the reduction of porosity may be the main reason contributed to the improved hardness, fracture toughness and bending strength of B 4 C/Mo/TiC ceramic nozzles [3,8] Fig. 5 illustrates the cumulative mass loss of B 4 C/Mo/ TiC ceramic nozzles in abrasive air-jet.…”

In-situ compaction and sintering of Al2O3-B4C composites by using a High-Frequency Induction System

“…This method is usually applied to ceramic materials [16]. [18]. Al 2 O 3 -B 4 C powders were sintered successfully with no pressure.…”