Study on Diesel Soot (Part 2) Discussion Concerning the Mechanism of Valve Train Wear by Diesel Soot.

Kagaya, Mineo

doi:10.1627/jpi1958.40.488

Cited by 5 publications

(4 citation statements)

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“…Many studies have been conducted to understand the characteristics of soot emitted under a diesel engine environment and its impact on the wear of engine components equipped with EGR. − It has been established that crankcase soot degrades the lubricant oil properties physically and chemically, thereby inducing wear on engine parts. However, a study on the time-scale interaction of soot with lubricant chemistry and subsequent changes in the structure and chemistry of soot would provide better insight into the understanding on the role of soot in an engine.…”

Section: Introductionmentioning

confidence: 99%

Influence of Engine Age on Morphology and Chemistry of Diesel Soot Extracted from Crankcase Oil

et al. 2016

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In this study, the role of engine age on the structure and chemistry of crankcase soot was studied using X-ray diffraction, high-resolution transmission electron microscopy, energy-dispersive spectroscopy, and Raman spectroscopy. Results indicate that the basic structure of the carbonaceous species remains the same in all cases and is composed of turbostratic carbon. However, there are some very subtle changes in the structure of the soot as the age of the engine increases. Older engines have a greater proportion of non-crystalline amorphous carbonaceous constituents in the soot relative to newer engines. In addition, the wear-induced debris increase with the age of the engine, with a larger proportion of phosphates of Ca and Zn as well as sulfates of Ca in the soot of older engines. The presence of these wear debris particles incorporated in the soot extracted from the crankcase indicates that they arise from three-body abrasive wear between the soot and the tribofilms formed within the engine.

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Section: Introductionmentioning

confidence: 99%

Influence of Engine Age on Morphology and Chemistry of Diesel Soot Extracted from Crankcase Oil

et al. 2016

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“…Depending on the rotation speed, material trapped between two milling balls experiences high energy impact as well as friction during rotation. Rotation speed of planetary ball mill was 300 rev min 21 with ball to carbon black ratio of 10 : 1. The blend was milled for 24 h without interruption.…”

Section: Milling Of Carbon Blackmentioning

confidence: 99%

“…SPM image was acquired in the contact mode using Berkowich diamond tip on a UB1 Hysitron Triboindenter. The images were scanned with tip velocity of 30 mm s 21 and surface was scanned in the middle of the wear track. The surface roughness was analysed using triboview software for an area of 30630 mm.…”

Section: Spmmentioning

confidence: 99%

Role of thermal, mechanical and oxidising treatment on structure and chemistry of carbon black and its impact on wear and friction: Part 2 – Boundary lubrication condition

Patel

Aswath

2014

Tribology - Materials, Surfaces & Interfaces

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Mineral oil formulations with zinc dialkyl dithiophosphate (ZDDP) and dispersant (poly isobutylene succinimide ashless dispersant or 'PIBSA') and fully formulated oils with and without carbon black were subjected to thermal and mechanical treatment and tribologically tested on TE 77 (high frequency reciprocating rig or 'HFRR') machine to examine the frictional performance during the test. These results were compared to oils without carbon black and oils with diesel soot. Results indicate that oils with just ZDDP and dispersant had the highest friction that remains constant for the duration of the test while oils with carbon black in the milled and oxidised condition had the lowest coefficient of friction and the smallest surface roughness in the tribofilm. The mechanism of wear with treated carbon black and diesel soot was found to be polishing wear as evidenced by the scanning probe microscopy images of the tribofilms. Tribofilms were analysed with X-ray absorption near edge structure (XANES) and it was seen that oils without carbon black or even with untreated carbon black had sulphates at the surface, while the oils with carbon black that were treated had a higher proportion of sulphides. A combination of both FeS and ZnS was found in the tribofilms along with short chain phosphates of Zn.

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“…Physical and chemical degradation of lubrication oil and subsequent wear of engine component due to presence of soot is well documented. 1–27 A great deal of attention has been paid to this problem since 2007 when the environmental protection agency (EPA) implemented emission norms API CJ 4 in an effort to reduce emission of pollutants from diesel engine along with the mandates to extend the life of diesel particulate filters and catalytic converters by lubrication decomposition products in tail pipe. 28,29…”

Section: Introductionmentioning

confidence: 99%

Role of thermal, mechanical and oxidising treatment on structure and chemistry of carbon black and its impact on wear and friction Part I: Extreme pressure condition

Patel

Aswath

2014

Tribology - Materials, Surfaces & Interfaces

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Carbon black was blended in different oil formulations that included base oil with ZDDP and dispersant as well as fully formulated oils. The blended formulations were then subjected to various thermal, oxidative and mechanical treatments to force interaction between the carbon black and different constituents of the oil and thermo-oxidative decomposition products of oil. Wear studies conducted on the treated compositions were compared with formulations that were blended with extracted diesel soot. XANES analysis of extracted diesel soot and treated carbon black were compared to elucidate similarities between the two in terms of their chemical constituents. Tribological and XANES results indicate that it is possible to simulate wear conditions similar to those seen with diesel soot when appropriate thermo-oxidative conditions were used.

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Study on Diesel Soot (Part 2) Discussion Concerning the Mechanism of Valve Train Wear by Diesel Soot.

Cited by 5 publications

References 0 publications

Influence of Engine Age on Morphology and Chemistry of Diesel Soot Extracted from Crankcase Oil

Influence of Engine Age on Morphology and Chemistry of Diesel Soot Extracted from Crankcase Oil

Role of thermal, mechanical and oxidising treatment on structure and chemistry of carbon black and its impact on wear and friction: Part 2 – Boundary lubrication condition

Role of thermal, mechanical and oxidising treatment on structure and chemistry of carbon black and its impact on wear and friction Part I: Extreme pressure condition

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