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... PTFE). Duże ilości odpadów tego polimeru powstają w następstwie specyficznejtechnologii przetwórstwa PTFE, polegającej na jego spiekaniu z proszków i zwykle późniejszej obróbce wiórowej. Zagospodarowanie odpadów ...
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Polyurethanes (PUR) are widely used for some elements of machinery and equipment, including in motorized shock-absorbing nodes and technical seals that can work in various operating conditions. The article presents the results of... more
Polyurethanes (PUR) are widely used for some elements of machinery and equipment, including in motorized shock-absorbing nodes and technical seals that can work in various operating conditions. The article presents the results of tribological investigations of polyurethane elastomers (EPUR) with different hardness (75, 83, and 93 °Sh A), which cooperated with steel in assembly lubrication conditions (mixed friction) with two types of grease (showing low and high adhesion to steel), with variable values of unit pressure p and sliding speed v. For the research, a rotary plan for two variables (p and v) was applied at five levels of their value. Based on the results of the tests of particular associations, the regression functions of the form of the second degree polynomial were determined, enabling the development of results in the form of spatial and contour diagrams. Based on the results of tribological tests, recommendations for designers dealing with the design and construction of...
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PURPOSE The main goal of the work was to find the interconnection between the high-frequency magnetron sputtering parameters and the adhesion properties of CaP coatings formed on the surface of titanium substrate. METHODS... more
PURPOSE The main goal of the work was to find the interconnection between the high-frequency magnetron sputtering parameters and the adhesion properties of CaP coatings formed on the surface of titanium substrate. METHODS Calcium-phosphate coatings, similar in composition to hydroxyapatite, were generated by high-frequency magnetron sputtering on titanium substrate at different values of high-frequency specific power over times of one and two hours. Afterwards, the generated coatings were studied using the method of X-ray phase analysis, and sclerometric tests (scratch test) were carried out. The adhesion strength of the deposited coatings was tested for different coating thicknesses from 0.45 to 1.1 × 10⁻³ mm. RESULTS According to the results of sclerometry, it was found that with an increase in the high-frequency specific power of plasma to 3.15 W/cm², the adhesion strength of the calcium-phosphate coating also increases. For all the coatings, the critical loads at which the coati...
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T R I B O L O G I A 5-2011 182 raturze mo zna znale źc przede wszystkim opracowania dotycz ące wplywu temperatury na procesy tarcia materialow polimerowych. Wci ąz jednak niewiele jest informacji na temat wplywu wilgotno ści na te... more
T R I B O L O G I A 5-2011 182 raturze mo zna znale źc przede wszystkim opracowania dotycz ące wplywu temperatury na procesy tarcia materialow polimerowych. Wci ąz jednak niewiele jest informacji na temat wplywu wilgotno ści na te procesy. W niniejszej pracy podj eto prob e analizy wplywu temperatury i wilgot-no ści powietrza na wspolczynnik tarcia statycznego wybranych par śli-zgowych typu metal–polimer. Przedstawiono wyniki bada n dla wybra-nych par ślizgowych typu metal–polimer w warunkach tarcia technicznie suchego. Badania przeprowadzono na stanowisku typu „pin-on-disc” w komorze klimatycznej w zakresie temperatury od 10°C do 90°C oraz wilgotno ści wzgl ednej od 35% do 95%.
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EFFECT OF SELECTED LUBRICATIVE EXPLOATIONAL PREPARATIONS ON THE TRIBOLOGICAL PROPERTIES OF POLYMERIC MATERIALS DURING FRICTION WITH STEEL Slowa kluczowe: kompozyty ślizgowe PTFE, smarowanie, wlaściwości tribologiczne, war-stwa... more
EFFECT OF SELECTED LUBRICATIVE EXPLOATIONAL PREPARATIONS ON THE TRIBOLOGICAL PROPERTIES OF POLYMERIC MATERIALS DURING FRICTION WITH STEEL Slowa kluczowe: kompozyty ślizgowe PTFE, smarowanie, wlaściwości tribologiczne, war-stwa wierzchniaKey words: PTFE sliding composites, lubrication, tribological properties, surface layer Streszczenie W artykule przedstawiono wyniki wstepnych badan rozpoznawczych wplywu wybranych preparatow eksploatacyjnych, dodawanych do olejow
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The paper presents problems related to the lubrication of moving machine nodes that are operating in an aggressive environment occurring in copper mines. The analysis was based on the exploitation of self-propelled wheeled machines, such... more
The paper presents problems related to the lubrication of moving machine nodes that are operating in an aggressive environment occurring in copper mines. The analysis was based on the exploitation of self-propelled wheeled machines, such as transport vehicles, loaders, drilling and anchoring cars. In self-propelled machines there are from 15 to 40 moving parts exposed to high impact loads and stresses. These are mainly bolted joints performing swinging motion as well as rotary motion at low rotational speeds up to 10 rpm. Observations and operational tests of several dozen manifolds and pumps operating in the environment occurring in KGHM Polska Miedź copper mines were carried out during two years. It was stated that elements made of aluminum or its alloys should not be used, and should be replaced with bronze (the proposal results in the increase of weight and costs of the system, but observational studies have shown that the durability and reliability of pumps increased more than ...
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Tribological tests were aimed at determining the value of static friction coefficient μ0 of EPUR with hardnesses 75, 80, 83, and 93 ° Sh A, during friction on C45 steel under various lubrication conditions. In the tests, the unit pressure... more
Tribological tests were aimed at determining the value of static friction coefficient μ0 of EPUR with hardnesses 75, 80, 83, and 93 ° Sh A, during friction on C45 steel under various lubrication conditions. In the tests, the unit pressure values in the range of p = 0.2 – 0.8 MPa and the time of stationary contact under load were changed in the range of t = 1 – 9 min, both in dry friction conditions, lubricating with water, and lubricating with two types of greases – with low and high adhesion to steel. The tests were carried out on a device whose operating principle is based on an inclined plane. The results of the tests showed that both the unit pressure and the stationary contact time have a significant impact on the value of the static friction coefficient in the EPUR-steel pair.
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Tribological tests were aimed at determining the value of static friction coefficient μ0 of EPUR with hardnesses 75, 80, 83, and 93 ° Sh A, during friction on C45 steel under various lubrication conditions. In the tests, the unit pressure... more
Tribological tests were aimed at determining the value of static friction coefficient μ0 of EPUR with hardnesses 75, 80, 83, and 93 ° Sh A, during friction on C45 steel under various lubrication conditions. In the tests, the unit pressure values in the range of p = 0.2 – 0.8 MPa and the time of stationary contact under load were changed in the range of t = 1 – 9 min, both in dry friction conditions, lubricating with water, and lubricating with two types of greases – with low and high adhesion to steel. The tests were carried out on a device whose operating principle is based on an inclined plane. The results of the tests showed that both the unit pressure and the stationary contact time have a significant impact on the value of the static friction coefficient in the EPUR-steel pair.
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The article presents the results of the comparative tribological study of the resistance of multicomponent polyoxymethylene (POM) composites to abrasive wear. The fillers for the studied POM matrix composites were a PTFE powder, the... more
The article presents the results of the comparative tribological study of the resistance of multicomponent polyoxymethylene (POM) composites to abrasive wear. The fillers for the studied POM matrix composites were a PTFE powder, the bronze powder, chopped glass fibre, and glass microballs, which were used both individually and in various combinations. Quantities of the composites were developed based on the simplex plan of the experiment. For the research, a Tester T-07 was used as a test stand. The study was conducted in the presence of loose abrasive, electrocorundum F90, subjected to the same conditions of friction for all the tested composites. The study has shown that the most effective compound in increasing resistance to the abrasive wear of the POM composites is the powder of bronze and the hybrid glass filler; whereas, the PTFE powder caused a slight reduction in the resistance to abrasive wear. In order to explain the mechanism of the abrasive wear of the studied composite...