Synthesis of Boron Carbide by Reactive‐Pulsed Electric Current Sintering in the Presence of Tungsten Boride

Abstract

The method of pulsed electric current sintering (PECS) has been used to obtain dense boron carbide (B4C) and B4C‐based composite materials containing tungsten boride (W2B5). To elucidate the role of the sintering additives and the mechanism of reactive densification, three types of materials have been obtained by PECS at 1850°C and 1900°C: “pure” B4C, B4C doped with 10 wt% W2B5, and B4C doped with 10 wt% tungsten carbide (WC). X‐ray diffraction and X‐ray photoelectron spectroscopy have been used to determine crystallite size, phase changes, and the peculiarities of the chemical bonds of the densified materials. Structural and mechanical properties of the materials have been investigated using scanning electron microscopy, optical microscopy, ultrasound velocity measurements, and hardness tests. The electrochemical impedance spectra have been used to investigate the electrical properties of the PECS‐ed materials.

The Effects of Transition Metal Oxides (Me = Ti, Zr, Nb, and Ta) on the Mechanical Properties and Interfaces of B4C Ceramics Fabricated via Pressureless Sintering

“…These disadvantages are caused by the low self-diffusion coefficient and the dominance of covalent bonds in the B 4 C atomic structure [4][5][6][7][8]. To solve this problem in order to improve the mechanical properties of multiphase ceramics, scholars and engineers have added various second-phase constituents [9][10][11].…”