Effect of Cr Addition on Properties and Tribological Behavior at Elevated Temperature of Boride Layers Grown on Borosintered Powder Metallurgy Alloys

Günen, Ali; Bölükbaşı, Ömer Saltuk; Özgürlük, Yasin; Özkan, Derviş; Odabaş, Okan; Somunkıran, İlyas

doi:10.1007/s12540-022-01251-3

Cited by 12 publications

(6 citation statements)

References 58 publications

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“…The results of thermal fatigue cycling studies of coatings by Wang et al [13] indicated that as the chromium content of the chromium alloy coatings increased, the total crack length of the alloy decreased, and the thermal fatigue properties of the alloys increased significantly. Friction and wear tests by Günen et al [14] and Guo et al [15] have demonstrated that the addition of appropriate amounts of Cr has a 2 of 13 strengthening effect on the properties of coatings, which is mainly reflected in the improvement of microhardness, wear resistance at high temperatures, and oxidation resistance. Drozdz et al [16] further improved the oxidation resistance by depositing a small amount of yttrium additive on the Cr coating.…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear Characteristics of Cr-CNTs Composite Coating End Faces of High-Temperature Mechanical Seals

Yang,

Li,

et al. 2023

Coatings

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To improve the reliability of the end faces of high-temperature mechanical seals, a high-performance composite material that introduces carbon nanotubes (CNTs) into the laser-melted Cr coating is proposed. In this study, for high-temperature and high-speed mechanical seals under actual working conditions, friction and wear tests were conducted under different working conditions and using different end face materials. The high-temperature tribological properties of the Cr-CNTs coatings were analyzed, and the strengthening mechanism of the Cr-CNTs coatings on end faces was investigated. The results indicate that the wear resistance of the Cr-CNTs coating at high temperatures is first enhanced and then weakened with the increase in the CNTs content. The composite coating end face performance is optimal when the CNTs content is 10 wt%. The presence of CNTs between the end faces when grinding against the graphite ring favors the generation of a graphite film. The coefficient of friction of the Cr-CNTs coating is reduced by at least 12.46% compared to the Cr coating at a temperature of 483 K. This study provides reference examples for the application of carbon nanotubes in high-performance mechanical seals and new research ideas for improving the performance of mechanical seal end faces.

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Section: Introductionmentioning

confidence: 99%

Friction and Wear Characteristics of Cr-CNTs Composite Coating End Faces of High-Temperature Mechanical Seals

Yang,

Li,

et al. 2023

Coatings

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“…The main process and steps of a conventional route include powder production, blending/mixing of powders and additives, hot or cold pressing, and sintering. [ 1 ] The P/M technique offers several advantages for the manufacture of finished parts over other competing processing routes. P/M typically leads to refined microstructures optimizing mechanical properties, it also requires fewer machining steps in comparison to cast and forged products, and the process is well suited for large‐scale production allowing the manufacture of structural parts at lower costs.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…It is a process in which boron atoms in the medium diffuse into the compact to form borides while physical bonds in the compact are converted to chemical bonds, which represents a cost-effective manufacturing process for the production of high-performance metal compact steel. [1,2,14] The presented study added boron to 2205 duplex stainless steel in the atomization step conducted before sintering. Consequently, boron addition was all over the microstructure of the base material and not just at the surface resulting in a bulk…”

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confidence: 99%

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Characterization of a 2205 Duplex Steel Modified with Boron Obtained via Powder Metallurgy

Morita Terceiro,

Soyama

2023

steel research int.

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Stainless steels are commonly used when a good balance between mechanical properties and corrosion resistance is required. Usually, to increase wear resistance, hard particles are added (carbides, borides, nitrides, and others) to the more ductile matrix (ferrite or austenite). The addition of boron to steels leads to the formation of primary and eutectic borides, which harden the material as solidified. Therefore, herein, the viability to prepare a modified 2205 duplex steel with 2.5 wt% of boron through powder metallurgy is investigated. The boron addition is performed in the atomization step. In addition, the effect of temperature in the sintering process is investigated, as well as the characterization of microstructure formation, phase transformations, and mechanical properties. The specimens are prepared from a prealloyed metal powder with three different granulometries: thick (250–500 μm), medium (106–180 μm), and thin powders (<45 μm). Shaping is conducted by cold uniaxial compaction with sintering in a controlled Ar atmosphere. An optimal sintering temperature of 1200 °C is identified for all granulometries studied. However, the highest densification of >85% is observed with medium powder with an increase of nearly 40% in microhardness in comparison to the reference 2205 steel.

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“…To reveal the processes occurring on the friction surface, which reflects the wear mechanism, the utilization of the advanced characterization techniques including scanning and transmission electron microscopy and methods of chemical and phase analysis is necessary, as evident, for example, from papers published by Österle et al [15], Filip et al [16], and recently of Günen et al [17].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Metallurgical Slags in Cu-free Friction Material Formulations

et al. 2022

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The aim of our research was to indicate the suitability of metallurgical slags (two blast furnace slags and one steel furnace slag) as the components of Cu-free friction materials. The base mixture consisted of nine components including phenolic resin, graphite, tin sulphide, steel and aramid fibers, iron powder, a mixture of barite with calcite, and vermiculite. To this base mixture, the slags with a particle size below 0.1 mm were added individually in the amount of 20 wt.%. A base friction mixture with alumina in the amount of 20 wt.% represented the reference. Samples for the friction-wear tests were produced in the form of pins by hot press molding. The prepared pins were tested using a pin-on-disc tester in a drag mode at the pressure of 1 MPa and a constant sliding speed of 1.51 m/s for 90 min. The samples with slags exhibited slightly lower values of steady-state friction coefficient compared to the reference composite with alumina, and at the same time produced lower wear particle emissions. The particle concentration was reduced for the samples with slowly cooled blast furnace and steel furnace slag. The results obtained indicated steel furnace slag as a promising component of Cu-free friction composites.

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Effect of Cr Addition on Properties and Tribological Behavior at Elevated Temperature of Boride Layers Grown on Borosintered Powder Metallurgy Alloys

Cited by 12 publications

References 58 publications

Friction and Wear Characteristics of Cr-CNTs Composite Coating End Faces of High-Temperature Mechanical Seals

Friction and Wear Characteristics of Cr-CNTs Composite Coating End Faces of High-Temperature Mechanical Seals

Characterization of a 2205 Duplex Steel Modified with Boron Obtained via Powder Metallurgy

Utilization of Metallurgical Slags in Cu-free Friction Material Formulations

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