Synthesis and Characterization of TiN‐coated Cubic Boron Nitride Powders

Abstract

Titanium nitride‐coated cubic boron nitride (TiN/cBN) composite powders were prepared by nitridizing TiO2/cBN powders in a NH3 flow at 950°C. The TiO2/cBN powders were synthesized via a sol‐gel process using tetra‐butyl titanate and concentrated‐HNO3‐treated BN powders as starting materials. The techniques of XRD, SEM, TEM, FT‐IR, and TG‐DTA were used to characterize the products and their intermediates. The cBN powders were uniformly coated with TiN nanoparticles. During the nitridization, the morphology of the TiO2/cBN powders is unchanged. The TiN/cBN powders can be used as starting materials to prepare polycrystalline cBN compacts, or as reinforcements to strengthen metal‐matrix composites.

Rapid Synthesis of Sub-5 nm Sized Cubic Boron Nitride Nanocrystals with High-Piezoelectric Behavior via Electrochemical Shock

“…Three clear diffraction peaks at values of 43.54°, 50.92°, and 75.10° can be observed in the XRD pattern of the pristine bulk powder, which correspond to the (111), (200), and (220) crystalline planes of c-BN phase (JCPDS No. 35-1365), respectively . However, the intensities of the observed diffraction peaks of the c-BN NCs are conspicuously decreased, indicating that the c-BN has been exfoliated and disintegrated during the reaction.…”

A Novel Method of Recovery Vanadium from Vanadium Slag through CaO2‐Briquetting Roasting Process

“…Herein, further analysis by FTIR is carried out on the samples roasted at 500–1000 °C, and the spectra are shown in Figure 4 . As illustrated in Figure 4a, the absorption bands at 3461 and 1633 cm −1 are assigned to –OH bending vibrations [ 18 ] and –OH stretching vibrations [ 19 ] of the absorbed water molecules, respectively. Figure 4b shows the infrared spectrum of the fingerprint region; the band at 576 cm −1 represents Fe–O vibration and is due to the transverse absorption of Fe 2 O 3 ; [ 20 ] it shows a redshift and becomes weaker with the increase of temperature.…”

Investigations on the microwave absorption properties and thermal behavior of vanadium slag: Improvement in microwave oxidation roasting for recycling vanadium and chromium

“…1(b), for the vanadium slag, the FT-IR absorption bands appeared at 468.09 cm -1 , 578.52 cm -1 , 876.59 cm -1 , 962.88 cm -1 , 1636.80 cm -1 , and 3456.70 cm -1 . Detailedly, the stretching and bending vibrations of -OH bond of surface water molecules in vanadium slag correspondingly cause the absorption bands at 1636.80 cm -1 and 3456.70 cm -1 (Chen et al, 2014;Mostafa et al, 2009); the rocking vibrations of Si-O-Si bond in SiO2 phase and the stretching mode of Fe-O bond at the octahedral sites in (Mn, Fe)(V, Cr)2O4 phase result the absorption band at 468.09 cm -1 , which is a superimposed bond (Hoex et al, 2006), meanwhile, the stretching modes of metal-O bonds at the octahedral sites in (Mn, Fe)(V, Cr)2O4 phase arouse the absorption band at 578.52 cm -1 (Ishii and Nakahira, 1972); additionally, the asymmetric stretching vibrations of Si-O bond of [SiO4] tetrahedra bands in (Mn, Fe)2SiO4 phase cause the narrow absorption bands at 876.59 cm -1 and 962.88 cm -1 (Jeanloz, 1980).…”