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Influence of lubricated sliding couple structural material type on generated potential difference value

Cypko E., Kałdoński T.

Journal of KONES

2011

Vol. 18, No. 1

103-108

In earlier investigations it found that in lubricated sliding couples is generated electrical potential difference (GPD). The sensitivity of this tribological index and information quantity contained in it far exceeds than previously used (classical) indicators, like coefficient of friction or temperature. Previous investigations do not allow to draw generalizing conclusions, how the force of the tribological parameters affect the GPD signal value. Selected materials of samples and counter-sample were grouped in pairs, forming various combinations I - the same name materials couple, in which the sample and counter-sample were made of the same material; II - the various name materials couple, in change places pairs, in which the two different materials interchangeably in one case are the samples and the second - counter-samples; III - the various name materials couple, in change places pairs, in which the sample from one material was mated with counter-samples from different materials. The testing materials were selected associations represented by a series of metal lying in the Volta electropotential (galvanic) series, both relatively close to each other, as well as a considerable distance and some of the same metal alloys. In presented investigations it was state that there was no clear relationship between the recorded GPD signal effective potential value and the values of the electropotential (galvanic) series. The GPD signal value is individual feature of the each couple and depends on the type of construction materials each pairs of elements forming the each couple. The GPD signal value is lower for the same name materials couple, in which the sample and counter-sample were made of the same material, than for various materials couple. It was found that in the various name materials couple, in which the two different materials interchangeably in one case are the samples and the second - counter-samples, GPD signal value is different.

Analysis of pin's surface layer structure influence on interaction with sliding couple elements using GRP

Cypko E.

Journal of KONES

2009

Vol. 16, No. 1

77-83

Earlier researches have proven that sliding bearings cooperating with different surface layers of s have shown different wear. There is also a difference between cooperation characteristics, which can be measured with help of different electric potential (GRP) in sliding couple. Analyzing changes in characteristics of generated potential difference effective value u s-grp during operation allows to estimate time Tg since the beginning until to forming of oil wedge shows up and estimate time Ts — says about stabilization tribological processes infrictional contact (running-in process was finished). This work will present the investigations results of s surface layer structure influence on the size of wearing of cooperating bearing and the characteristics of this cooperation. It has been proven, that there is a definite impact of a phase structure; with a good probability it became clear that grain size and placement and size of different phases also provided some impact on cooperation of pivots and bearings. Considering pivots covered with clear metallic coating, there have been proven impact of the type of metallic coating, macrostructure (density of crack mesh) have also been proven to be very influential.