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Elektroschmelzwerk Kempten Gmbh

Elektroschmelzwerk Kempton, Gmbh

Jochen Greim

Michael Fundus

Karl A Schwetz

Karl Egglhuber

Hubert Thaler

Holger Lundt

Christian Andrae

Bert Ripper

Anton Katheininger

Helmut K&ouml;lker

A method is for simultaneously cutting off a multiplicity of wafers from a hard, brittle workpiece which has a longitudinal axis and a peripheral surface. The workpiece is guided, by means of a translational relative movement, directed perpendicular to the longitudinal axis, between the workpiece and a wire web of a wire saw with the aid of a feed device, through the wire web which is formed by a sawing wire. The workpiece is rotated about the longitudinal axis while the wafers are being cut off. There is also a wire saw which is suitable for carrying out the method and has a device for holding and for rotating the workpiece about the longitudinal axis.

Method and device for simultaneously cutting off a multiplicity of wafers from a workpiece

A bearing material of silicon carbide particularly useful for application in the hot water field is provided having improved corrosion resistance under increased thermal stresses wherein the bearing material is characterized by a predominantly course-grained silicon carbide matrix of pressureless sintered silicon carbide having a biamodal grain sized distribution wherein the biomodal grain size distribution is formed by from 50 to 90% by volume of prismatic, tabular, silicon carbide crystallites having a length of from 100 to 1500 .mu.m and from 10 to 50% by volume of prismatic tabular silicon carbide crystallites having a length of from 5 to &lt;100 .mu.m.

Bearing material of silicon carbide

The invention relates to bearing materials of porous SiC having a trimodal pore composition and also a process for their production. The porous bearing material of pressureless-sintered SiC having from 3 to 10% by volume of independent closed pores having a trimodal pore composition consisting of micropores (M), fiber-shaped macropores (F) and spherical macropores (S), where the amounts in the pore system F-M-S (FIG. 1) are fixed by the trapezoidal area having the corner points

Bearing material of porous SIC having a trimodal pore composition

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Buchenberg, Germany

Jochen Greim