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Carbide
About: Carbide is a research topic. Over the lifetime, 36331 publications have been published within this topic receiving 503586 citations.
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TL;DR: In this paper, the fracture toughness of a number of cemented carbide alloys have been determined using a wedge-impact method for precracking; the materials were of WC-Co type with cobalt content ranging from 6 to 25 wt-% and mean carbide grain size between 1.0 and 3.3 μ m.
100 citations
TL;DR: In this paper, the reduction characteristics of CuFe2O4 and Fe3O4 by methane at 600-900°C were determined in a thermogravimetric analyzer for the purpose of using CuFe 2O4 as an oxidant of two-step thermochemical reforming.
100 citations
01 Nov 1972-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this paper, the activity of carbon in austenitic Fe-Mo-C, Fe-Cr-C and Fe-V-C alloys has been studied by equilibration with controlled CH4-H2 atmospheres at temperatures in the range 850° to 1200°C.
Abstract: The activity of carbon in austenitic Fe-Mo-C, Fe-Cr-C, and Fe-V-C alloys has been studied by equilibration with controlled CH4-H2 atmospheres at temperatures in the range 850° to 1200°C. The observations included a number of compositions in the two-phase fields, γ + carbide. Equations are given for the activity coefficient of carbon as a function of temperature and composition in the austenite field and from these the other thermodynamic properties of the solution may be computed as desired. The phase boundaries γ/γ + carbide were determined by breaks in the isoactivity lines. This was supplemented in the case of Fe-Mo-C alloys by metallographic linear analysis of equilibrated samples. The results confirm certain published phase diagrams and discredit others.
100 citations
TL;DR: In this paper, the authors determined the controlling mechanism of steady-state creep for reaction-bonded silicon carbide which was subjected to high temperatures (1848 to 1923 K) and constant compressive stresses (110 to 220 MN/m2).
Abstract: The kinetic characteristics and the controlling mechanism of steady-state creep were determined for NC–430 reaction-bonded silicon carbide which was subjected to high temperatures (1848 to 1923 K) and constant compressive stresses (110 to 220 MN/m2). Both as-received and as-crept materials were studied extensively by transmission electron‘microscopy as one means of determining the controlling creep mechanism. Small variations in sample density resulted in large variations in the creep rate. The stress exponent, n in the relation eασn, was found to be 5.7 and the creep activation energy 711 ± 20 kJ/mol. The controlling creep mechanism was determined to be dislocation glide/climb controlled by climb.
100 citations
TL;DR: In this paper, the percolation and subsequent PTCR effects were observed for all the powders in both semi-crystalline (polyethylene) and amorphous (epoxy) polymer matrix materials.
Abstract: Ceramic-polymer composite thermistors using conducting boride, silicide, and carbide powders that include TiB2, ZrB2, NbB2, NbSi2, WSi2, MoSi2, and TiC have been fabricated. Percolation and subsequent PTCR effects were observed for all the powders in both semi-crystalline (polyethylene) and amorphous (epoxy) polymer matrix materials, however, as found for carbon black and metal fillers, both niobate powders did not exhibit a PTCR effect in the amorphous polymer. Results indicate that percolation and PTCR behaviour are related to the powder characteristics (size/distribution), composite microstructure and ceramic-polymer interface. Composite thermistors with room temperature resistivities as low as 1 Ω cm and a nine-order of magnitude change (Δϱ) at 1 kHz (12 Δϱ at d.c.) were achieved.
100 citations