An Experimental Study on Microstructure of Tungsten Alloys

Abstract

The aim of this study is to provide information about microstructural and thermal properties of tungsten-based composites. Phase composition and microstructural characterization of tungsten composites were performed using X-ray diffractometer (XRD), Scanning Electron Microscopy (SEM), and Raman Spectroscopy. SEM images revealed the distribution of tungsten (W), vanadium carbide (VC) and graphite (C) powders in the tungsten matrix. The Raman spectra showed two major peaks, which are recorded at 1331 (vs) cm−1, and 1583 (vs) cm−1. These bands can be attributed to disorder graphite (D) and graphite (G). Thermogravimetric analysis (TGA) measurements were performed to determine the weight loss and thermal stability of the tungsten-based composites under argon gas atmosphere and at high temperatures. TGA measurements were performed to determine weight loss and thermal stability of tungsten-based composites under argon gas atmosphere and at high temperatures. The TG curve showed a slight weight loss in this temperature range. Mass loss is thought to be due to oxidation and gas desorption of materials.

New Type of Catalyst for Efficient Aerobic Oxidative Desulfurization Based On Tungsten Carbide Synthesized by the Microwave Method

“…The peak located at 1322 cm –1 corresponds to graphite (G band) and 1584 cm –1 can be ascribed to disordered graphite (D band). 36 , 47 The G band corresponds to the E 2g vibration of graphitic carbon with an sp 2 electronic configuration, whereas the D band is associated with the A 1g mode of the diamond-like carbon with an sp 3 configuration. 50 Besides, the spectra showed the presence of tungsten carbide and oxide phase in the samples.…”

“…34,35 It is known that the oxidation of tungsten to oxides occurs on the surface of tungsten carbide in air. In particular, ref 36 shows the presence of the WO 2 phase on the surface of tungsten carbide. This fact, taking into account the known literature data, suggests that tungsten carbide can potentially catalyze aerobic oxidation reactions.…”

Mechanism of formation water molecules and chemical bonds in Leptothrix materials

“…As observed in the 2D morphology of the structure, the dynamics of oxide distribution are weak, and the areas and sizes of particle distribution vary in the microstructure. The particle size (60-70 μm) increases and/or remains constant (65 μm) in the morphology of samples taken from different coordinates (Demir et al, 2020). Differentsized amorphous regions have been identified on the surface of the samples at different locations.…”

The Effect of Cold Swaging of Tungsten Heavy Alloy with the Composition W91-6Ni-3Co on the Mechanical Properties

“…At this temperature, nickel and cobalt melt and combine with tungsten grains. After sintering, the material can be described as a two-phase composite consisting of spherical tungsten grains embedded in a bonding phase that is a Ni/Co/W alloy [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ].…”