The influence oil additives on spread cracks in silicon nitride

Waldemar Karaszewski

The influence oil additives on spread cracks in silicon nitride

Abstract

The paper presents an experimental study of the influence of oil additives (Cl, S, P, cerium dioxide (CeO2)) on spread cracks in silicon nitride. The additives Cl, S, P are bound in molecules in liquid form soluble in the base oil. The CeO2 is purely in powder form in suspension. The use of CeO2 powder was made based on the good results of polishing of silicon nitride. A ceramic angular contact ball bearing was modelled using a four-ball machine. Silicon nitride, View the MathML source-in diameters balls were artificially damaged with pre-cracks. Ring formed pre-cracks were propagated on the ball surface by a blunt impact load using a tungsten carbide ball under five various impacts.Rolling contact fatigue failure modes were studied under high contact stresses and speed. The surface of silicon nitride balls before and after failure was examined using scanning electron microscopy.The research of the present paper shows that fatigue failure under rolling contact loading is markedly sensitive on the size of pre-cracks and oil additives. Propagations of surface pre-cracks takes place under fatigue load. Primary and secondary surface crack propagation are described.

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Waldemar Karaszewski dr hab. inż.

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Category:: Articles
Type:: artykuł w czasopiśmie z listy filadelfijskiej
Published in:: TRIBOLOGY INTERNATIONAL no. 41, pages 889 - 895,
ISSN: 0301-679X
Language:: English
Publication year:: 2008
Bibliographic description:: Karaszewski W.: The influence oil additives on spread cracks in silicon nitride// TRIBOLOGY INTERNATIONAL. -Vol. 41., nr. iss. 9-10 (2008), s.889-895
Verified by:: Gdańsk University of Technology