The use of Powder Metallurgy for promoting friction reduction under sliding-rolling lubricated conditions

Boidi, G.; Profito, Francisco J.; Kadiric, Amir; Machado, Izabel Fernanda; Dini, Daniele

doi:10.1016/j.triboint.2021.106892

Cited by 7 publications

(5 citation statements)

References 53 publications

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“…The authors have already published most of the experimental work for sintered [29,37,41,57,58] and textured materials [33, 56, 72, 73] presented in the following…”

Section: Resultsmentioning

confidence: 99%

“…Besides, an ad-hoc measuring and postprocessing procedure, including the choice of the roughness filter and cut-off values), was developed to weakening pore contours' effects on roughness characterization. More details of this procedure can be found in previous publications [29,[56][57][58]. The surface roughness of the reference smooth material NP was evaluated using the Sq parameter.…”

Section: Powder Metallurgy Sintering Techniques and Porositymentioning

confidence: 99%

“…Different sintering parameters were used for varying porosity, see Table 1. Only one sintering condition is presented for the ball-shaped samples as this set of parameters (Ball-Sint) was the only one where open surface pores could be observed after machining [29,56]. Three different compacting pressures were used with the conventional sintering technique for obtaining disc samples with different porosity.…”

Section: Powder Metallurgy Sintering Techniques and Porositymentioning

confidence: 99%

“…The sintered ball samples presented higher COF than NP for all SRRs and entrainment speeds, similarly to sintered discs. These outcomes are not explicitly reported here and the reader is referred to the original reference for a more in-depth result examination [29]. As for the sintered disc, the improved performance of NP compared to sintered balls could be attributed to the significant difference in surface roughness of almost one order of magnitude between the two sets of samples (see Table 2).…”

Section: Sintered Samplesmentioning

confidence: 99%

“…However, in contrast to deterministic laser textureswith a precisely tailored topographysurface pores are statistically distributed and have irregular shapes. The effect of pores on mechanical proprieties of sintered materials was extensively studied [23][24][25][26]; however, the influence of surface porosity on the tribological performance is sparsely investigated [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Tribological Performance of Random Sinter Pores vs. Deterministic Laser Surface Textures: An Experimental and Machine Learning Approach

Boidi¹,

Grützmacher²,

Varga³

et al. 2022

Tribology of Machine Elements - Fundamentals and Applications

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This work critically scrutinizes and compares the tribological performance of randomly distributed surface pores in sintered materials and precisely tailored laser textures produced by different laser surface texturing techniques. The pore distributions and dimensions were modified by changing the sintering parameters, while the topological features of the laser textures were varied by changing the laser sources and structuring parameters. Ball-on-disc tribological experiments were carried out under lubricated combined sliding-rolling conditions. Film thickness was measured in-situ through a specific interferometry technique developed for the study of rough surfaces. Furthermore, a machine learning approach based on the radial basis function method was proposed to predict the frictional behavior of contact interfaces with surface irregularities. The main results show that both sintered and laser textured materials can reduce friction compared to the untextured material under certain operating conditions. Moreover, the machine learning model was shown to predict results with satisfactory accuracy. It was also found that the performance of sintered materials could lead to similar improvements as achieved by textured surfaces, even if surface pores are randomly distributed and not precisely controlled.

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“…The authors have already published most of the experimental work for sintered [29,37,41,57,58] and textured materials [33, 56, 72, 73] presented in the following…”

Section: Resultsmentioning

confidence: 99%