Patent ID: 9557114
Date: 2017-01-31
CPC Classifications: A61C,C04B,F27B,F27D

Claim:
1. A dental furnace for sintering oxide-ceramic materials comprising a heating chamber surrounded by heating elements and a thermal insulation layer, wherein the dental furnace is configured such that the heating chamber is heated up in a first heating-up period at a first heating-up rate of more than 50° K/min, which heats the furnace to at least 1000° C., the first heating-up period is followed by an intermediate heating period having an intermediate heating-up rate which is at least five minutes long, wherein during the intermediate heating period about 90 percent of final density of the oxide-ceramic material being sintered is achieved, the intermediate heating period is followed by an end heating-up period during which end heating-up is effected at a heating-up rate of more than 30° K/min, during the end heating-up period the furnace temperature is held for at least five minutes, above a temperature that has been measured at the end of the first heating-up period, and wherein forced cooling of the furnace is performed after the furnace temperature is held for at least five minutes, and the end heating-up period has a rate that is slower than the first heating-up rate.