Aktiebolaget Skf

Ab Skf

Skf Aerospace France S.a.s

Charlotte Vieillard

Saeid Esmaeilzadeh

Lars Kahlman

Katarina Flodstrom

Zhijian Shen

Antonio Gabelli

Rudolf Hauleitner

Guillermo Enrique Morales Espejel

Xiaobo Zhou

Yoann Hebrard

Victor Brizmer

Herve Carrerot

Aidan Kerrigan

Maarten Noordman

Knut Henrik Johansen

Paul Heinrich Michael Boettger

Robin Cundill

Hans Hillen Schjelderup

Jelena Sekulic

Andriy Volodymyrovych Rychahivskyy

Method for detecting at least one critical defect in a ceramic rolling element providing the steps of capturing a plurality of two-dimensional digital radiographic images of the ceramic rolling element; digitally filtering each radiographic image; delineating, on the basis of the filtered image, at least one region liable to comprise the critical defect; constructing stereoscopically a virtual model of the ceramic rolling element having the region; comparing the dimensions of the delineated region with a plurality of predetermined threshold values, and, when the dimensions are greater than the threshold values, generating an alarm signal.

Method for detecting a critical defect in a ceramic rolling element

A Hybrid rolling bearing includes an inner raceway and an outer raceway and a plurality of rolling elements arranged therebetween. The outer raceway and the inner raceway are made from bearing steel, having a first surface RMS roughness R. The rolling elements are made from a ceramic material and have second surface RMS roughnesses R. At least one of the rolling elements has an increased surface RMS roughness R, which is significantly higher than the RMS roughnesses R, of the remaining rolling elements. The hybrid rolling bearing can be installed within a refrigerant compressor.

Hybrid rolling bearing, particularly for refrigerant compressor

A bearing includes a liquid lubricant and at least one ceramic component, which, during operation of the bearing, is subject to rolling contact load. A tribological surface of the at least one ceramic component is impregnated with a sealant, such that the liquid lubricant is prevented from entering discontinuities in the tribological surface.

Bearing and method of inhibiting crack propagation in a bearing component

The present invention provides a ceramic material comprising: a first phase comprising zirconia, yttrium and cerium, wherein the yttrium and cerium are present in a molar ratio of 0.15 to 0.5 and in a combined amount of 5 to 15 mol %, a second phase comprising alumina, and a third phase comprising metal aluminate platelets.

Zirconia-alumina ceramic materials

The invention concerns a sintered ceramic component of silicon nitride or sialon suitable as rolling element in a bearing and a manufacturing method for making such ceramic components. The ceramic component has high density and a homogeneous and fine microstructure, giving the component excellent mechanical properties. Manufacturing of the sintered ceramic component by SPS is cost-effective and rapid.

Large ceramic component and method of manufacture

The invention concerns a method for manufacturing a ceramic material with pseudo-isotropic microstructure. The method for tailoring the microstructure for manufacturing of sintered ceramic components involves a spark plasma sintering (SPS) process. By performing the SPS process in at least two steps it is possible to separate densification from grain growth. An initial sintering step at a first temperature and a first pressure, followed by a controlled grain growth step at a higher temperature and lower pressure makes it possible to manufacture ceramic components with controlled microstructure and improved mechanical properties.

Method for manufacturing ceramic components

An improved rolling bearing, in particular one being used in aqueous environment, such as water and steam, comprising an outer race, an inner race, rolling elements, and a retainer holding said rolling elements in a spaced relation from each other, wherein the races of the bearing are made of stellite, the rolling elements are made of hot-isostatic-pressed alumina-zirconia composites, and the retainer is made of poly-ether ether ketone comprising graphite fibers, graphite powder, and polytetrafluoroethylene.

Rolling bearing

Growing community of inventors

Woerden, Netherlands

Charlotte Vieillard