Now showing 1 - 2 of 2
  • Publication
    Prototype tilting pad thrust bearing with novel ceramic material for harsh service environments
    ( 2022)
    Raeve, Karel de
    ;
    Borsoi Klein, Tiago
    ;
    ; ;
    Kraenzler, Thomas
    ;
    Faulhaber, Stephan
    ;
    ;
    Product-lubricated pumping applications require extremely robust bearings, especially in the case of sand-loaded lubrication fluids. For high power/high speed pump applications, tilting pad bearings are the preferred bearing solution, due to their superior rotordynamic characteristics. For product-lubricated applications, materials with good corrosion and abrasion resistance characteristics have to be used. The lubricant for the bearing in these applications is often a water based fluid (e.g. sea water) with low viscosity and with particle contamination (e.g. sand). Existing tilting pad product lubricated bearings (PLB) solutions have the issue that catastrophic failures tend to occur under severe conditions or that they are limited in available size (e.g. polycrystalline diamond (PCD) bearings). A tilting pad thrust bearing and a thrust collar made of a novel ceramic material with improved tribological properties was designed, manufactured and tested for use in such applications.
  • Publication
    Wear of abrasive media and its effect on abrasive flow machining results
    Abrasive media were examined before and after application in abrasive flow machining to evaluate the wear of media due to the machining process. Both media were tested on workpieces under the same working conditions to study the effect of abrasive media wear on the results of the machining process. With the help of rheological and granulometric characterisation methods, it has been shown that alterations of rheological behaviour and composition of the abrasive medium as well as particle shape and size are responsible for the degradation of the abrasive efficiency. The increasing viscosity of the abrasive medium and progressing rounding of the large abrasive particles as a result of the machining process are the main factors that cause a decreased material removal rate and reduced surface quality.