Influence of alloying elements on the sintering thermodynamics, microstructure and properties of Fe–MoS2 composites

Furlan, Kaline P.; Prates, P.B.; Santos, Thayna Andrea dos; Dias, Matheus Vinícius Gouvêa; Ferreira, Heitor Tavares; Neto, João Batista Rodrigues; Klein, Aloı́sio Nelmo

doi:10.1016/j.jallcom.2015.08.242

Cited by 32 publications

(13 citation statements)

References 23 publications

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“…The materials are likely to have a ferritic microstructure with the second phase homogeneously dispersed in the matrix. Based on the available literature, it is known that molybdenum disulfide decomposes in sintered iron, and molybdenum additionally stabilizes the ferritic structure [17][18][19][20]. The chemical composition at selected points (points 1-3 in Figure 11) is presented in Table 6.…”

Section: Metallographic Test Resultsmentioning

confidence: 99%

Research on the Influence of the Manufacturing Process Conditions of Iron Sintered with the Addition of Layered Lubricating Materials on its Selected Properties

et al. 2020

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The purpose of the conducted experiments was to test the selected properties of materials intended for porous sintered bearings containing layered materials in the form of powders with an average particle size of 0.5–1.5 μm, with very good tribological properties. The subject of the research was a sinter based on iron powder with the addition of layered materials; molybdenum disulfide MoS2 (average particle size 1.5 μm), tungsten disulfide WS2 (average particle size 0.6 μm), hexagonal boron nitride, h-BN (average particle size 0.5 and 1.5 μm) with two different porosities. The article presents the results of density and porosity tests, compressive strength, metallographic and tribological tests and the assessment of changes in the surface condition occurring during the long storage period. The use of layered additives allows for an approximately 20% lower coefficient of friction. In the case of sulfides, the technological process of pressing 250 MPa, 350 MPa, and sintering at a temperature of 1120 °C allows us to obtain a material with good strength and tribological properties, better than in the case of h-BN. However, the main problem is the appearance of elements from the decomposition of sulfide compounds in the material matrix, which results in rapid material degradation. In hexagonal boron nitride, such disintegration under these conditions does not occur; the material as observed does not degrade. In this case, the material is characterized by lower hardness, resulting from a different behavior of hexagonal boron nitride in the pressing and sintering process; in this case, pressing at a pressure of 350 MPa seems to be too low. However, taking into account that even with these technological parameters, the obtained material containing 2.5% h-BN with an average grain size of 1.5 μm allowed obtaining a coefficient of friction at the level of 0.41, which, with very good material durability, seems to be very positive news before further tests.

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Section: Metallographic Test Resultsmentioning

confidence: 99%

Research on the Influence of the Manufacturing Process Conditions of Iron Sintered with the Addition of Layered Lubricating Materials on its Selected Properties

et al. 2020

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“…Given the accuracy of X-ray detection, 10wt% of MoS 2 was added to the MS system. The dosages of FeS and Cu 2 S were selected on the basis of potential chemical reactions [19]. Detailed compositions are listed in Table 1.…”

Section: Component Designmentioning

confidence: 99%

“…MoS 2 is one of the most commonly used solid lubricants for Cu-Fe-based friction materials; it can be used to stabilize friction and improve the wear resistance of composites [6][7][8][9]. However, numerous studies have shown that MoS 2 reacts with Cu or Fe matrices when sintered at temperatures above 950°C [10][11][12][13][14][15][16][17][18][19][20][21]; our recent study revealed that the lubricity of MoS 2 is attributable to the resultant formation of metal sulfides such as FeS [21]. Because of its layered structure, good thermal stability, and low cost, FeS may be a suitable alternative to MoS 2 lubricants in the production of Cu-Fe-based friction materials.…”

Section: Introductionmentioning

confidence: 99%

Solid FeS lubricant: a possible alternative to MoS2 for Cu–Fe-based friction materials

Peng

Yan

Zhan

et al. 2017

Int J Miner Metall Mater

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Molybdenum disulfide (MoS 2 ) is one of the most commonly used solid lubricants for Cu-Fe-based friction materials. Nevertheless, MoS 2 reacts with metal matrices to produce metal sulfides (e.g., FeS) and Mo during sintering, and the lubricity of the composite may be related to the generation of FeS. Herein, the use of FeS as an alternative to MoS 2 for producing Cu-Fe-based friction materials was investigated. According to the reaction principle of thermodynamics, two composites-one with MoS 2 (Fe-Cu-MoS 2 sample) and the other with FeS (FeS-Cu 2 S-Cu-Fe-Mo sample), were prepared and their friction behaviors and mechanical properties were compared. The results showed that MoS 2 reacted with the Cu-Fe matrix to produce FeS, metallic ternary sulfides, and Mo when sintered at 1050°C. The MoS 2 -Cu-Fe and FeS-Cu 2 S-Cu-Fe-Mo samples thereby exhibited similar characteristics with respect to phase composition, density, hardness, and tribological behaviors. Micrographs of the worn surfaces revealed that the stable friction regime for both composites stemmed from the iron sulfides friction layers rather than from the molybdenum sulfides layers.

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“…However, the true potential of MoS 2 nanosheets in MMCs has not ever been investigated before. There are only a few studies reported in MMCs reinforced with bulk crystal MoS 2 instead of nanosheets as solid lubricant for Cu, Fe, Al, and their alloys' matrix [25][26][27][28][29][30][31]. With the addition of MoS 2 , the tribological properties were obviously improved with lower friction coefficient and wear rate, but the mechanical properties deteriorated due to the soft nature of bulk crystal MoS 2 .…”

Section: Introductionmentioning

confidence: 99%

Balancing Strength and Ductility in Al Matrix Composites Reinforced by Few-Layered MoS2 through In-Situ Formation of Interfacial Al12Mo

et al. 2021

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In this work, few-layered MoS2 (FLM) nanosheet-reinforced Al matrix composites are developed through powder metallurgy and hot extrusion. The microstructure, mechanical properties, and strengthening mechanisms have been systematically investigated. It is found that Al12Mo and Al2S3 can be formed in-situ during the sintering process, resulting in the improvement of interfacial bonding between FLM and Al matrix. With 1.5 wt.% of FLM addition, an improved tensile strength of 234 MPa with a high elongation of 17% can be obtained. Moreover, the strengthening mechanisms are also demonstrated to be grain refinement, dislocation strengthening, and load transfer, and the calculation indicates that load transfer is the main contribution factor. This work will inspire more new designs of metal matrix composites with balanced strength and ductility.

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Influence of alloying elements on the sintering thermodynamics, microstructure and properties of Fe–MoS2 composites

Cited by 32 publications

References 23 publications

Research on the Influence of the Manufacturing Process Conditions of Iron Sintered with the Addition of Layered Lubricating Materials on its Selected Properties

Research on the Influence of the Manufacturing Process Conditions of Iron Sintered with the Addition of Layered Lubricating Materials on its Selected Properties

Solid FeS lubricant: a possible alternative to MoS2 for Cu–Fe-based friction materials

Balancing Strength and Ductility in Al Matrix Composites Reinforced by Few-Layered MoS2 through In-Situ Formation of Interfacial Al12Mo

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