公开(公告)号：EP1144076B1

公开(公告)日：2004-03-31

申请号：EP99963384.5

申请日：1999-12-03

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

发明人： ADLER, Jörg ,  LENK, Reinhard ,  RICHTER, Hans-Jürgen

IPC分类号： B01D39/20 ,  B32B18/00

CPC分类号： B01D39/2075 ,  B32B18/00 ,  C04B35/653 ,  C04B2235/656 ,  C04B2235/6567 ,  C04B2235/658 ,  C04B2237/343 ,  C04B2237/365 ,  C04B2237/72

摘要： The invention relates to the area of ceramics and to ceramic multilayer filters of the type used for separating gases. The aim of the invention is to provide ceramic multilayer filters which are more economical to produce. To this end, the inventive ceramic multilayer filters consist of at least two layers of different particle size, the particle surfaces of all of the ceramic particles being completely or partially perfused with a material and spot and/or surface joins being formed between particles. The invention also provides a method for producing ceramic multilayer filters of this type, according to which slips are produced from at least two ceramic powders of different particle size, the particles of said ceramic powders being perfused with a material or a material in powder form being added to the ceramic slips. One or more layers are formed from the slips and then dried. At least two layers are placed one above the other and/or joined to each other and together, are subjected to a temperature increase.

公开(公告)号：EP0717726A1

公开(公告)日：1996-06-26

申请号：EP94927595.0

申请日：1994-09-09

申请人： Dolomitwerke GmbH ,  FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

发明人： RICHTER, Hans-Jürgen ,  SCHOBER, Reiner ,  PUTZKY, Gerhard ,  KÖNIG, Gert

IPC分类号： C04B35

CPC分类号： C04B35/597 ,  C04B35/65

摘要： The invention relates to the fields of ceramics and metallurgy and pertains to a process for producing refractory materials based on a SiAION/C or SiAlON/SiC/C composite. The aim of the invention is to indicate a process that prevents increased porosity due to the reaction of the carbon with the oxide or nitride phases of the material. This is accomplished by the invention through a process for producing refractory materials characterized in that to produce a refractory material with SiAlON and carbon, a mixture containing silicon, aluminum, aluminum oxide and carbon is heated in a predominantly nitrogen-containing atmosphere in three stages up to a maximum temperature of 2200 DEG C and that to produce a refractory material with SiAlON/SiC and carbon, the mixture may contain silicon carbide as well and the mixture is heated in a predominantly nitrogen-containing atmosphere in two stages to a maximum temperature of 2200 DEG C.

公开(公告)号：EP1461173A1

公开(公告)日：2004-09-29

申请号：EP01274884.4

申请日：2001-12-07

申请人： Schütz-Dental GmbH ,  FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DERANGEWANDTEN FORSCHUNG E.V.

发明人： RABE, Susanne ,  EISELT, Wolfgang ,  LENK, Reinhard ,  RICHTER, Hans-Jürgen

IPC分类号： B22C1/18 ,  A61C13/20

CPC分类号： B22C1/181 ,  A61C13/081 ,  A61C13/083

摘要： The invention relates to a casting material for producing casting molds for casting high-melting point materials. Said casting material comprises a powdered component that contains magnesium oxide and aluminum oxide, and a liquid component. The powdered component additionally contains a calcium aluminate and an alkali fluoride or alkaline-earth fluoride, and the liquid component contains a polyelectrolyte and an alkaline component, said alkaline component adjusting the pH of the liquid component at between 10 and 14. The powdered and the liquid component are mixed, a flowable slip is produced, which is used, once dried, solidified and sintered, to produce a hollow mold.