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Maslyuk, V. A.

doi:10.1023/a:1011363827610

Cited by 6 publications

(1 citation statement)

References 3 publications

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“…This is especially critical for iron-based matrices, as the iron sulfides present higher stability, i.e., a higher value of (negative) Gibbs free energy of compound formation ∆G 0 than molybdenum disulfide in the range of the temperatures commonly used for the sintering of iron-based composites. This reaction has also been reported by other authors [16][17][18][19][20][21][22]. Furthermore, Furlan et al have shown that for a pure Fe-MoS 2 system the reaction starts already at a very low temperature of 775 • C, altering the microstructural aspects of the lubricant phase [23].…”

Section: Introductionsupporting

confidence: 82%

Controlling the Solid-State Reaction in Fe-MoS2 Self-Lubricating Composites for Optimized Tribological Properties

2022

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In this work, self-lubricating composites containing MoS2 and graphite dispersed in an iron matrix were produced by powder metallurgy and sintering. Previous studies demonstrate that MoS2 reacts with iron matrixes during sintering, making the production of Fe-MoS2 composites rather difficult. Therefore, this study focused on a potential solution to avoid or reduce this reaction, whilst still providing good tribological properties. Our results show that the addition of graphite retards the reaction of MoS2 with iron and that the combination of MoS2 + graphite results in composites with an optimized coefficient of friction associated with a low wear rate both in nitrogen and air atmospheres. Through adequate control of the lubricant’s particle size, composition, and processing parameters, self-lubricating iron-based composites with a low dry coefficient of friction (0.07) and low wear rate (5 × 10−6 mm3·N−1·m−1) were achieved. ·

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Section: Introductionsupporting

confidence: 82%

Controlling the Solid-State Reaction in Fe-MoS2 Self-Lubricating Composites for Optimized Tribological Properties

2022

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Dissolution of chromium carbide Cr3C2 in Kh17N2 steel during sintering

Yakovenko

Maslyuk

Gripachevskii

et al. 2011

Powder Metall Met Ceram

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The effect of sintering temperature (900-1300°C) on the interaction of Cr 3 C 2 with a Kh17N2 steel matrix is studied. It is shown that complex iron-chromium carbide of (Cr, Fe) x C y type forms during sintering. With increasing temperature, it undergoes a number of phase transformations. The following mechanism of Cr 3 C 2 dissolution in the steel matrix is established:The effectiveness of chromium carbide Cr 3 C 2 as a doping agent in producing wear-and corrosion-resistant materials was previously verified in [1][2][3]. Powder composites containing Cr 3 C 2 can be used to make tools and machine parts designed to perform in conditions of abrasive wear and in hostile environments and to deposit protective coatings on parts and mechanisms. The steel component of such materials and the proximity of linear expansion coefficients of the coating and the part promote strong and unstressed adhesion between them.The performance properties of the alloys in question are largely determined by the nature of interaction between carbides of the solid phase and the steel matrix during sintering. As a rule, this interaction leads to complex redistribution of elements between carbides and the matrix. To control the interaction of chromium carbide with the steel matrix, clear understanding of the nature and mechanism of this process is needed to limit the impact of temperature and time factors to the maximum extent.The published data on the interaction of chromium carbide with a metal matrix are incomplete [4][5][6] or mainly focus on the interaction of Cr 3 C 2 with an iron matrix [7]. The studies by Napara-Volgina and colleagues deal only with composites based on Kh18N15 austenitic steel with Cr 3 C 2 and MoS 2 additives. These data do not reflect quantitative changes in chemical composition of the carbide phase at different sintering temperatures.Our objective is to examine the variation in phase and chemical composition of chromium carbide particles in contact with a Kh17N2 chromium steel matrix and to establish the mechanism of their dissolution during heating.

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