Kompozyt ślizgowy do diagnostyki termicznej węzłów tarcia

• Autorzy: Zimowski S. , Rakowski W. , Habdank-Wojewódzki T. , Kot M.

Warianty tytułu

EN

Slide composite for thermal diagnostic of friction nodesl

• Języki publikacji: PL

Abstrakty

PL

Sensorowe kompozyty poliimidowe (PI) są materiałami o dobrych właściwościach tribologicznych i piezoelektrycznych.Charakteryzują się stabilnością tych własnosci w funkcji składu wagowego. Niektóre kompozyty PI wykazują własności typowe dla czujników temperatury lub nacisku. Dzięki odpowiedniemu doborowi składników i technologii sieciowania otrzymano materiał ślizgowy stanowiący równoczesnie sensor w węźle tarcia

EN

Contemporary development of micromechanics (LIGA, MEMS) has been caused by more and more modern constructions of micro equipment such as engine, turbine, pump, motor operator, where micro bearings are the basic motion element. Operational character of such micro equipment demands high reliability and correctness of operation because the influence of tribological processes on their operation is decisive due to large co-operation area-to- volume ratio. It is particularly important with structural elements being at the same time diagnostic elements. This eliminates the necessity of applying additional sensors to monitor the operation status of friction nodes in standard bearings. As sensor composites are materials reacting to parameters of entries or to the ambient environment, they can be used as elements of measuring systems. Good tribological properties also allow the utilisation of these composites in bearings or slide bearing coats reacting to external factors with the change of resistance. Apart of being a slide coat they are also elements of the measuring system. They allow diagnostic of friction node in real time by measurement of the resistance of semi-conductive layer. Materials with the required sensitivity are obtained by proper selection of components. Change of temperature of an element or change in temperature distribution indicates incorrect operation of a lot of technical equipment, that is why, this physical quantity is often used in diagnostic to define the status of an object or process. The examined material was sensor polymer composite of WIR type manufactured in department of Electronics at the University of Mining and Metallurgy in Cracow - indium resistance layer, composite of polyester-imide resin filled with indium, graphite and lubricant additives: MoS2, tarflen. Laboratory tests modelling the work of slide bearing were carried out on roller-concave block test stand. The aim of the test was to define the influence of temperature and speed of slide on electrical and tribological properties of WIRj composite. The sample consisted of WIRT composite put on concave surface of a steel block, and a steel roller was a counter-sample. Conductivity - friction coefficient relation in the function of temperature was determined for three speeds of the slide. Analysing the results of the performed tests, we can state that: Local temperature gradients cause local increase in stresses, so they change resistivity of the sensor layer in particular micro areas. The tested material shows good tribological and piezoresistant properties, so it can be used for slide coats in friction nodes with simultanous measuring of electrical conductivity correlated with operational parameters of the nod. Correlation between entry and exit parameters is necessary to decomposite the resistance into entry components.

Słowa kluczowe

PL

sensor termiczny; warstwa ślizgowa; kompozyt poliimidowy

EN

thermal sensor; sliding coatings; PI-Compozite

• Wydawca: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
• Czasopismo: Tribologia
• Rocznik: 1999
• Tom: nr 5
• Strony: 702--718
• Opis fizyczny: bibliogr. 7 poz.

Twórcy

autor

Zimowski S.

autor

Rakowski W.

autor

Habdank-Wojewódzki T.

autor

Kot M.

• Akademia Górniczo-Hutnicza, Katedra Podstaw Budowy i Eksploatacji Maszyn, Kraków