Abstract
A BN-TiB2-TiN composite was produced via reactive sintering of the hexagonal BN (hBN) with 20 wt% Ti. Spark plasma sintering (SPS) was used as the fabrication method and the sample was characterized by X-ray diffractometry, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. According to the results, the Ti was utterly consumed during the SPS, led to the in-situ TiB2 and TiN0.9 formations. Additionally, the microstructural study revealed the nucleation and growth of new hBN platelets from the initial fine hBN particles. Anyway, the final composite reached a relative density of 95%, because of the remaining free spaces between the hBN platelets. It was found that some nitrogen and boron atoms could leave the TiN and TiB2 microstructures, respectively, and diffuse into the opposing phase.
Highlights
Hexagonal boron nitride is an advanced ceramic with a crystalline structure similar to graphite, namely a lamellar one [1,2,3,4]
Based on the electron microscopy images and the X-ray diffractometry (XRD) spectrums of as-purchased powders, it can be noted that the morphology and particle size of each powder is in agreement with the datasheet presented by the manufacturer (Table 1)
The XRD spectrums imply that both starting materials were highly pure, and as a result, the amounts of possible impurities in these powders were such low that the XRD machine could not detect them
Summary
Hexagonal boron nitride is an advanced ceramic with a crystalline structure similar to graphite, namely a lamellar one [1,2,3,4] This material owns a unique combination of features, e.g., low elastic modulus, low density, high thermal conductivity, good thermal shock resistivity, high refractoriness, high abrasion resistivity, excellent corrosion resistivity, and significant dielectric and insulation characteristics, as well as good machinability, which makes it a suitable nominee for an extended range of industrial applications, such as thermocouples’ insulating sleeves, crucibles, protection tubes, and high-temperature furnaces [5,6,7,8,9,10,11]. Energydispersive X-ray spectroscopy, scanning electron microscopy, and Xray diffractometry were employed to investigate the SPSed sample
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