Surface durability and design criteria for graphite–bronze sintered composites in dry sliding applications

Muterlle, Palloma V.; Cristofolini, I.; Pilla, Melania; Pahl, W.; Molinari, A.

doi:10.1016/j.matdes.2011.03.048

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…For fabricating the copper-based MMC, various powder compounds like oxides, carbides, or antifriction disulfides may be used as fillers [8]. Carbon, as one of the most frequently used fillers, has many disadvantages in tribotechnical applications; one of them is its low resistance to high-temperature oxidizing in the air, which may cause the loss of solid lubricating in high temperature or/and speed loading conditions [9]. Therefore, more stable ceramic materials such as, for example, hexagonal boron nitride or boron carbide are preferable [10].…”

Section: Introductionmentioning

confidence: 99%

Friction Behavior of Aluminum Bronze Reinforced by Boron Carbide Particles

2021

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A promising composite material for tribotechnical applications based on aluminum bronze with reinforcing boron carbide particles fabricated by a special electron beam additive deposition technique was studied experimentally and numerically. Tribological experiments showed that reinforcing by carbide particles allowed reducing the coefficient of friction from 0.26 to 0.19 and improving the wear resistance by 2.2 times. Computer modeling reveals two main factors playing a significant role in the friction behavior of the studied metal matrix composite: the mechanical effect of reinforcing ceramic inclusions and effective hardening of the metal matrix due to the peculiarities of the 3D electron beam printing. The mechanical effect of hardening inclusions determines a more rounded shape of wear particles, preventing wedging, and thereby increasing the stability of friction. Strengthening the metal matrix leads to reducing the number of wear particles.

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Section: Introductionmentioning

confidence: 99%

Friction Behavior of Aluminum Bronze Reinforced by Boron Carbide Particles

2021

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“…They are maintenance-free, and ideally suited for use in difficult working environments, high temperature applications, etc. In one type, strong cast bronze is embedded with a solid lubricant in the form of powdered graphite [3]. However, bronze consists primarily of costly Cu combined with 12-12.5% Sn.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation of Fe-12Cr-0.3C-4Mn-(13-15)Cu Composite Alloys

Kim¹,

Bak²,

Hahn³

et al. 2019

Korean J. Met. Mater.

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Alloys of Fe-12Cr-0.3C-4Mn-(13, 14, 15)Cu (wt%) were cast using an induction furnace. They were structurally heterogeneous composites that consisted of a relatively stiff α-Fe matrix and a soft (Cu, Mn)-rich secondary phase. They were developed as self-lubricating, wear-resistant metals. Since the formation of oxides plays an important role in wear, understanding the oxidation behavior of two-phase, multi-component composites is of practical interest. This study was undertaken to understand the effect of varying Cu concentration on the formation of oxide scales. When the concentration of Cu in the alloys was increased to 13, 14, and 15 wt%, the volume fraction of the secondary phase also increased from 10.3, 11.2, and 13.3 vol%. When oxidized at 700 o C for 30 h, the secondary phase preferentially oxidized to oxide nodules due to Cu and Mn, which could not form a protective scale. The matrix was uniformly oxidized, forming a thin surface scale, due mainly to oxidation-resistant Cr in the matrix. When oxidized at 800-900 o C for 30 h, not only the secondary phase but also the α-Fe matrix oxidized rapidly, because of the increased reaction and diffusion rates, resulting in the formation of thick, bi-layered oxide scales. An Fe-rich outer scale was formed by the outward diffusion of Fe, Cr, Mn, and Cu, while a Cr-rich inner scale was formed by the inward diffusion of oxygen. Mn and Cu were rather uniformly distributed in the outer and inner oxide scales. The oxidation rates increased with increasing amounts of Cu, and significantly more with increasing temperature.

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“…In previous works, [17][18][19][20] a systematic approach to design against wear for PM parts was proposed, aimed at defining specific design criteria, which could help the designer to take into account the influence of the peculiar characteristics of PM components on the wear resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Different materials and wear conditions were considered as sliding 19,20 and dry rolling-sliding. 17,18 This work carries on the study of PM steel parts subject to dry rolling-sliding wear.…”

Section: Introductionmentioning

confidence: 99%

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Design guidelines for PM parts subject to dry rolling–sliding wear

Cristofolini¹,

Pilla²,

Straffelini³

et al. 2013

Powder Metallurgy

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This work improves the systematic approach proposed in previous papers, aimed at defining design criteria specific for powder metallurgy (PM) parts subject to wear in application. Dry rolling-sliding tests have been performed on PM steels obtained under different process conditions, and the results have been used as a knowledge base in the proposed design procedure to evaluate the effect of the material variables (porosity and microhardness) and geometrical parameters (contact length) on wear resistance. The failure criterion considered here to ensure the functionality provides to compare the wear thickness with a value deriving from the dimensional tolerances. If the failure criterion is not matched, then a change in the material variables and/or geometrical parameters is proposed. The occurrence of plastic deformation and/ or brittle contact at the surface region is also considered. Examples of application show that the most significant improvement is obtained by modifying both material variables and geometrical parameters.

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Surface durability and design criteria for graphite–bronze sintered composites in dry sliding applications

Cited by 9 publications

References 18 publications

Friction Behavior of Aluminum Bronze Reinforced by Boron Carbide Particles

Friction Behavior of Aluminum Bronze Reinforced by Boron Carbide Particles

High-Temperature Oxidation of Fe-12Cr-0.3C-4Mn-(13-15)Cu Composite Alloys

Design guidelines for PM parts subject to dry rolling–sliding wear

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