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COMPOSITE MATERIALS OF A 99.7 % ALPHA-ALUMINA MATRIX WITH PLATELETS OF SILICON CARBIDE (SICP) HAVE BEEN PREPARED BY GELCASTING. DENSIFICATION WAS CARRIED OUT BY GAS-PRESSURE SINTERING WITHOUT FURTHER SINTERING AIDS. FIVE DIFFERENT COMPOSITIONS WITH 0, 5, 10, 15, AND 20 VOL.% SICP RESP. HAVE BEEN INVESTIGATED AND TRIBOLOGICAL PROPERTIES WERE CHARACTERIZED. INCREASING AMOUNT OF SICP AS RIGID PARTICLES IN THE FINE GRAINED MATRIX COMPLICATE THE DENSIFICATION PROCESS. WITH THE APPLICATION OF 50 BAR AR PRESSURE DURING THE FINAL SINTERING STEP AT A TEMPERATURE OF 1700 DEGREE C THE DENSITY OF THE SAMPLES COULD BE INCREASED BY 3-5%. INVESTIGATION OF THE TRIBOLOGICAL PROPERTIES AGAINST STEEL AS A COUNTERBODY UNDER UNLUBRICATED OSCILLATING SLIDING CONDITIONS SHOWED A HIGH COEFFICIENT OF FRICTION AND AN INCREASING WEAR RATE UP TO A SICP CONTENT OF 10 VOL. % . AT 15 AND 20 VOL. % SICP RESP. BOTH THE COEFFICIENT OF FRICTION AND THE COEFFICIENT OF WEAR DROP DOWN.
This paper discusses the results and the consequences of the results obtained in a finished project on fretting
testing at very small amplitudes. In this project a crossed cylinders model contact (radius 2.5 mm) was tested
mainly in tangential oscillatory modes with strokes 2-100 µm, with forces between 0.5 and 5 N and frequencies
of 1 and 10 Hz, financed by the European Commission.
For non-noble contact platings it has been shown that very small amplitudes (< 10 µm) result in surface damage
and contact failure. For noble platings it results in surface damage, only followed by contact failure after wear
causes exposure of the non-noble underlayer.
The most important conclusion from the project work was that the contact resistance remains low and stable in
partial slip, while gross slip causes electrical failure(>0.5 .).
In this paper the following items are discussed: i) The application of the Mindlin theory to predict the transition
from partial to gross slip ii) Aspects of tribo simulation testing of electrical contacts iii) The methods of extending
the allowable external displacement amplitude by additional springs that absorb part of the motion, and iv)
The options if large vibrations at the contact interface can not be avoided.