DLC Coated Ring Pack for Heavy Duty Diesel Engines

Bruno, Rafael Antonio; Rabello, Rafael Bettini; Silva, Davi Antonio; Araujo, Julia

doi:10.5151/engpro-simea2017-35

Cited by 2 publications

(3 citation statements)

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“…In addition, the mechanical and tribological properties of the CrN/Cr 1-x Al x N multilayers sputtered at a constant bias (− 150 V) with distinct periodicities by varying the carousel rotational speed (0.5 rpm, 1.0 rpm, 1.5 rpm, and 2.0 rpm) were compared with state-of-the-art values measured for commercial PVD coatings of CrN applied to diesel piston rings 5 , see Table 2 . Both the commercial CrN coatings and the multilayers developed in this work were sputtered onto the outer diameter surface of diesel piston rings.…”

Section: Resultsmentioning

confidence: 99%

“…In the design of internal combustion engines, the piston ring pack is the most technically challenged sub-system regarding tribological issues due to higher wear ratio and scuffing 5 . One of the main objectives of piston rings is to seal the combustion chamber, and as the piston ring is worn out, more oil from the engine will be burned in the combustion chamber, thus raising the vehicle's pollutant emission levels.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid magnetron sputtering of ceramic superlattices for application in a next generation of combustion engines

Castilho

Rodrigues

Ávila

et al. 2022

Sci Rep

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A hybrid magnetron sputtering process (dcMS/HiPIMS) was developed to manufacture nanostructured CrN/Cr1-xAlxN multilayers, motivated by improving the low-emission efficiency when applied on gas-nitrided diesel piston rings of a next-generation of combustion engines. In order to improve the mechanical, tribological, and corrosion behavior of the multilayers, the hybrid dcMS/HiPIMS process was designed by selecting the optimal sputtering procedure applied to AISI 440 base steel. The effect of substrate bias and carousel rotational speed on the phase composition, crystallographic texture, residual stresses, surface roughness, coating periodicity and densification, instrumented hardness, elastic modulus, as well as wear and corrosion resistance was determined. The results have demonstrated that hybrid magnetron sputtering produces multilayers with a superlattice structure, which outperforms commercial PVD coatings of CrN for diesel piston rings manufactured by cathodic arc evaporation. Also, multilayer periodicities in the range of 5 to 10 nm yield the best tribological performance under bench tests for the piston ring/cylinder liner system.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid magnetron sputtering of ceramic superlattices for application in a next generation of combustion engines

Castilho

Rodrigues

Ávila

et al. 2022

Sci Rep

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“…The linear wear (both for the ring and cylinder liner) was quantified to compare the different multilayers. A commercial CrN coating deposited by cathodic arc [ 24 ] onto the gas-nitrided piston ring was used as a reference of wear resistance.…”

Section: Methodsmentioning

confidence: 99%

Tailoring the Hybrid Magnetron Sputtering Process (HiPIMS and dcMS) to Manufacture Ceramic Multilayers: Powering Conditions, Target Materials, and Base Layers

Castilho

Mazuco²,

Rodrigues

et al. 2022

Nanomaterials

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The mechanical and wear behavior of CrN/CrAlN multilayers were improved by tailoring the experimental conditions of a hybrid magnetron sputtering process based on a high-power impulse (HiPIMS) and two direct current magnetron sputtering (dcMS) power supplies. To this end, the influence of the base layer and of the combination of Cr and CrAl targets, which were switched to the dcMS and HiPIMS power supplies in different configurations, were investigated with respect to the growth of ceramic CrN/CrAlN multilayers onto commercial gas-nitrided diesel piston rings. The microstructure, grain morphology, and mechanical properties were evaluated by field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and instrumented nanoindentation. Bench wear tests simulating the operation of a combustion engine were conducted against a gray cast iron cylinder liner under reciprocating conditions using 0W20 oil as a lubricating agent enriched with Al2O3 particles. The results revealed a significant increase in hardness, resistance to plastic strain, and wear resistance when two CrAl targets were switched to a HiPIMS and a dcMS power supply, and a Cr target was powered by another dcMS power supply. The compressive coating stresses were slightly reduced due to the soft Cr base layer that enabled stress relief within the multilayer. The proposed concept of hybrid magnetron sputtering outperformed the commercial PVD coatings of CrN for diesel piston rings manufactured by cathodic arc evaporation.

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DLC Coated Ring Pack for Heavy Duty Diesel Engines

Cited by 2 publications

References 1 publication

Hybrid magnetron sputtering of ceramic superlattices for application in a next generation of combustion engines

Hybrid magnetron sputtering of ceramic superlattices for application in a next generation of combustion engines

Tailoring the Hybrid Magnetron Sputtering Process (HiPIMS and dcMS) to Manufacture Ceramic Multilayers: Powering Conditions, Target Materials, and Base Layers

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