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In this paper, ultra-fine Ti(C,N)–TiB2–Co cermets were prepared by reactive hot processing from the Co–Ti–C–BN system. Microstructure observation indicated that Co and TiB2 uniformly distributed in the ultra-fine Ti(C,N) matrix. Carbon contents in the reactants had a great influence on the porosity and properties of synthesized cermets. In the range of 11.76–13.79at.% carbon, dense samples were obtained...
Linear intercept on scanning electron microscopy micrographs is the most commonly used measurement method to determine carbide grain size and contiguity in WC–Co cemented carbides (hardmetals). However, it involves manual time-consuming measurements and is critically dependent on the quality of the micrographs as well as on the identification and definition of grain boundaries. In this study a two-stage...
Conventionally, metallic vanadium is produced from vanadium pentoxide (V2O5). Sodium metavanadate (NaVO3) is an essential intermediate product for the V2O5 production. A novel environmentally friendly route for the metallic vanadium preparation from NaVO3 by molten salt electrolysis is proposed. In the NaCl molten salt, NaVO3 has a high solubility of 8.6mol% (16.3wt.%) at 1173K and was easily electro-reduced...
We report the synthesis of Re2C at ambient pressure and temperature. The formation of rhenium carbide (Re2C) from the elements was obtained by mechanochemical treatment after 640min of milling. The microscopy analysis shows polyhedral particle agglomerates with diameters of less than 600nm. Thermogravimetric analysis results revealed the stability of material at up to 800°C as well as chemical and...
An Al2O3/TiC composite ceramic tool material was fabricated by microwave sintering. The cutting performance was experimentally studied when machining hardened alloy steel 40Cr (50±2HRC) and hardened tool steel T10A (60±2HRC), in comparison with those of an Al2O3/TiC ceramic tool (LT55) produced by hot-pressing technology and a WC/Co cemented carbide tool (YS8). Stereomicroscope, scanning electron...
Ceramic tools have been widely used in the cutting of hard-to-machine materials, but the applications of solid ceramic milling cutters are limited due to their design and manufacturing restrictions. This research investigates the cutting performances of four solid ceramic end milling tools including Si3N4, Ti(C,N), SG4 and LT55 in machining hardened AISI H13 steel (HRC 60-62). The results show that...
In this work, Taguchi L32 experimental design was applied to optimize flexural strength of ZrB2-based composites which were prepared by SPS. With this aim, batch ZrB2-based composites tests were performed to achieve targeted experimental design with nine factors (SiC, carbon fiber (Cf), MoSi2, HfB2 and ZrC content, milling time of Cf (M.t, hr) and SPS parameters such as temperature, time and pressure)...
Mixed 93W–4.9Ni–2.1Fe powders were sintered via the spark plasma sintering (SPS) and hybrid spark plasma sintering (HSPS) techniques with 30mm and 60mm samples in both conditions. After SPS and HSPS, the 30mm and 60mm alloys (except 60mm-SPS) had a relative density (>99.2%) close to the theoretical density. Phase, microstructure and mechanical properties evolution of W–Ni–Fe alloy during SPS and...
W–0.1wt.%TiC materials with and without the addition of PVP were fabricated by wet-chemical method and spark plasma sintering. The microstructures were characterized by FESEM and TEM. The results revealed that the addition of PVP remarkably improved the uniform dispersion of TiC particles during the synthesis process. W–TiC without PVP showed dispersoids with size of 100–1000nm were distributed unevenly...
In this work, a new method of SHS process has been investigated for the synthesis of SiAlON under low nitrogen pressure. A gel mixture of silica and sodium oxide (sodium silicate) as a reactant and catalyst was produced by alkali melting of silica, solving the results in water and heating in auto clave. Al powder was also used as reactants. Urea and aluminum nitrate hydrate was used as igniting agents...
The pressure and temperature region of the cubic BN precipitation was studied using Li3BN2 as synthetic solvent over the pressure and temperature range from 3.5 to 6GPa and 1100 to 1800°C for a duration of 0.3–11h. The pressure and temperature region of cubic BN formation in the BN-Li3BN2 was bounded by lowest temperature line and highest temperature line of cubic BN formation at constant pressure...
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