Influence of sintering temperature on the crystallization and mechanical properties of BN‐MAS composites

Abstract

A type of boron nitride-magnesium aluminum silicate (BN-MAS) composite ceramics was fabricated by hot-press sintering at different sintering temperatures. The relationship between the sintering temperature and microstructure was investigated by analyzing the interaction between hexagonal boron nitride (h-BN) and the MAS phase. The main MAS phase in the composite ceramics is the α-cordierite phase at a sintering temperature of 1300 • C. At temperatures above 1400 • C, the inhibitory effect of h-BN on the crystallization of the MAS system is significant, and MAS mainly exists in the form of an amorphous phase. The composite sintered at 1700 • C exhibited the highest bending strength of 218MPa. h-BN and MAS were co-enhanced. MAS can be used as an effective liquid-phase sintering aid to assist in the sintering of h-BN, whereas h-BN can absorb the fracture energy of the composite ceramics through the pull-out and bridging effect of the particles.

Microstructures and mechanical properties of B4C–SiC and B4C–SiC–TiB2 ceramic composites fabricated by hot pressing

“…Cordierite (magnesium aluminum silicate [MAS]) microcrystalline glass is an advanced glass–ceramic, which exhibits high dense density, high strength, and low melting point (1460°C), and thus can be considered a liquid phase sintering additive 18–23 . The main components of the MAS glass ceramic are α‐cordierite (Mg 2 Al 4 Si 5 O 18 ), mullite (Al 6 Si 2 O 13 ), forsterite (Mg 2 SiO 4 ), spinel (MgAl 2 O 4 ), sapphirine (Mg 4 Al 10 Si 2 O 23 ), and quartz (SiO 2 ) 24,25 .…”

Effect of B4C particle size and TiB2 content on the mechanical properties of B4C composites and their dynamic mechanical properties

“…It has excellent chemical and thermal stability and good mechanical properties. The melting point is about 1400 • C to 1465 • C. [10][11][12][13][14][15][16][17][18] The liquid phase is produced at the sintering temperature to promote the densification process of B 4 C ceramics.…”

Influence of sintering atmosphere on the formation of ZrSiO4 by solid‐state sintering method

“…Furthermore, the existing research studies on the formation mechanism of zircon were mainly carried out in air atmosphere. Recently, some new and efficient sintering technologies (for instance, spark plasma sintering 30,31 and hot-pressing sintering 32,33 ) were favored for the synthesis of ceramics with excellent property. However, there is no report on the preparation of ZrSiO 4 from ZrO 2 and SiO 2 powders by these technologies so far.…”