with viran or blanket on a paper or kartongmaskin in intervention abiding berelement

摘要

A supporting member for positioning in engagement with the screen or felt of a paper or cardboard machine for drainage and for sheet forming consists of one or more ceramic components of hard, dense sintered aluminium oxide having the following features: (1) a content of Al2O3 of from 97% to 98.5% by weight, a content of MgO of 0.5 +/- 0.3% by weight, and a content of SiO2 of from 1% to 2.5% by weight; (2) a Synder-Graff grain size of 5 mu m +/- 2 mu m; (3) a Vickers hardness of more than 1600 daN/mm2 at a testing load of 0.2 daN/mm2; (4) a bending strength of at least 300N/mm2; (5) a transcrystalline fracture proportion of more than 70% and (6) a surface characteristic specified by (a) a roughness of Ra 0.2 mu m, measured with a feeler needle having a radius of 3 mu m on a polished surface (b) a proportion of pores in the surface of less than 10%, and (c) a mean (median) pore size 5 mu m.