Temperature effect on bending strength of hot-pressed boron carbide materials

Abstract

in the amount of 2 and 5 wt.%, respectively). It is established that the maximal strength (445 MPa) is characteristic of the material B 13 C 2 over the whole temperature range. It does not change up to 1600°C. The increase in strength of B 4 C-based samples is revealed over the range of 1200 to 1600°C, mainly for high-porous materials (10-12%). Presumably, this is due to the higher relaxation properties of porous material microstructure.Developing high-density materials based on compounds with covalent bonds and studying their structureformation, strength, and degradation mechanisms in different loading conditions are the most important tasks of ceramic materials science. Of great interest among engineering ceramics are monophase materials and composites based on boron carbides (B 4 C, B 13 C 2 ) that may be used to fabricate light armor, in nuclear reactors, and under strong abrasion at

High‐Temperature Strength of Boron Suboxide Ceramic Consolidated by Spark Plasma Sintering

“…This follows the trend observed for boron carbide ceramics by other researchers (Fig. ) . However, above 1000°C the increase in strength was obvious, with values of 420–470 MPa obtained at 1400°C for B 6 O‐6:1 and B 6 O‐10:1.…”

“…Flexural strengths of the boron‐rich ceramics at room and elevated temperatures. The dashed lines in the case of B 4 C ceramics indicate the general tendencies observed in previous studies . Closed figures indicate that strength was measured using 4P set‐up, semi‐closed and open figures are for 3P flexural strength tests.…”

“…In case of high‐temperature strength values, only data of Ref. are collected using 4P flexural strength tests.…”

High-temperature strength of directionally reinforced LaB6–TiB2 composite

“…Hot pressing is used for obtainment of such materials but this method is inadequate for achieving of high purity and structure perfection which are crucially important for functional materials [1][2][3][4][5]. Employing directional crystallization of the boride systems enable one to fabricate high purity self-reinforced composites which consist of ceramic matrix reinforced by ceramic inclusions with advanced mechanical properties when compared to monolithic borides [6][7][8][9][10][11][12][13][14].…”

Hot‐Pressing Kinetics and Densification Mechanisms of Boron Carbide

“…According to G. De With, 23 plastic deformation might account for the increase in strength at high temperatures. The report 24 based on structural research also indicates that lattice plasticity in boron carbide may be responsible for the increase in strength at 1600°C. And the paper 25 shows that the dislocation creep is the predominant deformation mechanism when the temperature is above 1500°C and stresses above 90 MPa.…”