Dentsply Sirona Inc.

Degudent Gmbh

Irmgard Wissel

Markus Vollmann

Rudi Steinke

Carsten Wiesner

Marcel Meegdes

Stefan Fecher

Lothar Volkl

Lothar Völkl

Angela Klaus

Elmar Hock

Jörg Hachenberg

Gerhard Zellmann

Joerg Hachenberg

Peter Popp

The invention relates to a lithium silicate glass ceramic, which contains at least lithium disilicate as a crystal phase, and lithium aluminum silicate as further crystal phase. The lithium silicate glass ceramic in its initial composition contains AlOat 1.5 to 3.5 percent by weight, and KO at 0.6 to 1.8 percent by weight.

Lithium silicate glass ceramic

A method for manufacturing a shaped body, comprising creating a mixture of a metal powder and binding agent, compacting the mixture to form a green compact, heating the green compact to a debinding start temperature T, debinding the green compact by controlled heating of the green compact from start temperature Tto end temperature Tat a heat-up rate R, presintering the debindered green compact to the presinter end temperature Tat a heat-up rate R, cooling the green compact from the presinter end temperature Tat a cool-down rate R, whereby at least the heat-up rate R, the presinter end temperature T, and the cool-down rate Rare tuned relative to each other in such a way that the presintered green compact forming a blank has a surface porosity of 16% to 22% after presintering, and machining and sintering of the blank to form the shaped body.

Method for the manufacture of a shaped body as well as a green compact

The invention relates to a device () and a method for sintering sinter products, such as oxidation-prone materials, in particular metallic sintered goods (), in particular a dental framework, comprising a tray (), which accommodates the sinter product and is arranged on a base plate (), a pot-shaped cover (), which surrounds the tray, with a rim () that is sealed towards the base plate, as well as supply and discharge openings () for protective gas connected to the interior chamber () that is surrounded by the pot-shaped cover. In order to facilitate sintering even at temperatures above 1200&#xb0; C. without any problems, it is suggested that the tray () be covered by a capping element (), whereby when the tray is covered by the capping element, the interior chamber () of the tray is connected in a gas-flow-allowing manner to the interior chamber of the cover.

Device and method for sintering sinter products

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Freigericht, Germany

Irmgard Wissel