Topic
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 role of NbC as grain growth inhibitor and major carbide addition in terms of the densification behavior, the microstructure and mechanical properties was investigated.
Abstract: WC–NbC–12 wt%Co hardmetals with 0.45–60 wt%NbC were prepared by solid state pulsed electric current sintering (PECS), also known as spark plasma sintering (SPS), for 2 min at 1240 °C and conventional sintering (CS) for 1 h at 1420 °C. The role of NbC as grain growth inhibitor and major carbide addition was investigated in terms of the densification behaviour, the microstructure and mechanical properties. Experimental work revealed that the addition of more than 5 wt%NbC inhibits pressure assisted solid-state densification compared to WC–Co based hardmetals. The addition of NbC limits WC grain growth during PECS and conventional sintering, whereas substantial (Nb, W)C grain growth was observed in the hardmetals with ⩾0.9 wt%NbC addition. The influence of the NbC content on the hardness, strength and toughness of the WC–NbC–12 wt%Co hardmetals was explained in terms of WC grain growth inhibition and the formation of coarse (Nb, W)C grains.
124 citations
TL;DR: In this article, the synthesis of microporous carbons done by chlorination of boron carbide at various temperatures (400-1200 °C) is presented in which the structure obtained can be controlled by varying the chlorination temperature.
123 citations
TL;DR: In this article, the effect of austenitizing on the microstructure and hardness of two martensitic stainless steels was examined with the aim of supplying heat-treatment guidelines to the user that will ensure a martensite structure with minimal retained austenite, evenly dispersed carbides and a hardness of between 610 and 740 HV (Vickers hardness) after quenching and tempering.
Abstract: The effect of austenitizing on the microstructure and hardness of two martensitic stainless steels was examined with the aim of supplying heat-treatment guidelines to the user that will ensure a martensitic structure with minimal retained austenite, evenly dispersed carbides and a hardness of between 610 and 740 HV (Vickers hardness) after quenching and tempering. The steels examined during the course of this examination conform in composition to medium-carbon AISI 420 martensitic stainless steel, except for the addition of 0.13% vanadium and 0.62% molybdenum to one of the alloys. Steel samples were austenitized at temperatures between 1000 and 1200 °C, followed by oil quenching. The as-quenched microstructures were found to range from almost fully martensitic structures to martensite with up to 35% retained austenite after quenching, with varying amounts of carbides. Optical and scanning electron microscopy was used to characterize the microstructures, and X-ray diffraction was employed to identify the carbide present in the as-quenched structures and to quantify the retained austenite contents. Hardness tests were performed to determine the effect of heat treatment on mechanical properties. As-quenched hardness values ranged from 700 to 270 HV, depending on the amount of retained austenite. Thermodynamic predictions (using the CALPHAD™ model) were employed to explain these microstructures based on the solubility of the carbide particles at various austenitizing temperatures.
123 citations
TL;DR: In this article, a liquid metal solvent based co-segregation (LMSCS) strategy was proposed to fabricate a high uniformity of 2D WC crystals embedded in graphene by chemical vapor deposition (CVD) in one step.
123 citations
TL;DR: In this article, the authors used catalytic metal gate capacitors operating at about 800 degrees Celsius (C) for high temperature gas sensor devices, where hydrogen or hydrogen containing molecules were used.
Abstract: Catalytic metal gate-silicon dioxide-silicon carbide (MOSiC) capacitors operating to about 800-degrees-C are used as high temperature gas sensor devices. Hydrogen or hydrogen containing molecules, ...
123 citations