Effect of synthesis parameters on the crystallite size of WC-Ni composite powders obtained by gas-solid reaction

Lima, Maria José Santos; Silva, Fernando Erick Santos da; Souto, Maria Veronilda Macedo; Araújo, Kivia F.G.; Menezes, Roberta Araújo Cavalcante de; Filgueira, Marcello; Souza, Carlson Pereira de; Gomes, Uílame Umbelino

doi:10.1016/j.ceramint.2021.05.064

Cited by 6 publications

(1 citation statement)

References 35 publications

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“…With the increase of time to 240 min, the hexagonal NbN phase is predominant in the diffraction pattern, and it can be seen that this phase becomes stable 30,31 . It is important to note that the diffractograms obtained on the powders produced with isotherm times of 180, 240, 300, and 360 min showed similarities regarding the present crystal structure.…”

Section: Effect Of Isotherm Time Variationmentioning

confidence: 98%

Production of Niobium Nitride Via Nitrogen-Based Solid-Gas Reaction

et al. 2022

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Nanostructured niobium nitride was synthesized through a solid-gas reaction in an atmosphere of nitrogen and hydrogen using an oxalic niobium precursor. Crystal phases evolution throughout the reactive processes were evaluated using X-Ray Diffraction, reaction parameters modifications were performed in isotherm time, gas flow, and precursors' mass. It was verified the synthesis of a stable NbN material with a hexagonal structure under the following conditions: 1g of precursor, 300 min of isotherm at 1100 °C and, the gas flow of N 2 = 40% (v/v), and H 2 = 60% (v/v). The increase in gas phase flow and the decrease of solid load favored the process, and a pure and single-phase powder was obtained. This set indicates the importance of physical resistance in the fluid-particle interaction process. Under these conditions, the solid obtained had a crystallite size of 30 -50 nm.

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Section: Effect Of Isotherm Time Variationmentioning

confidence: 98%