Abstract

The extrusion tool (4) for producing a monolithic honeycomb body comprises a tool body (5) with an inlet side (6) and an outlet side (2) for a material to be extruded. With regard to a simple production of the extrusion tool (4), several continuous channels (18) are provided in the tool body (5), each of which have a continuous edge-free tapering between an inlet-sided inlet opening (8) and an outlet-sided outlet opening (20). The channels (18) are preferably introduced by means of a wire erosion method. The edge-free tapering allows for good flow capabilities during the extrusion process. The wire erosion method is preferably carried out in two steps and allows the inlet and outlet openings being freely variable.

IPC Classes  ?

• B28B 3/20 - Producing shaped articles from the material by using pressesPresses specially adapted therefor wherein the material is extruded
• B23H 9/00 - Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects

Abstract

A process for the gentle and efficient drying of a ceramic honeycomb body is specified. The process is suitable for achieving, with uniform drying of the honeycomb body, a short drying time and low shrinkage of the honeycomb body. For this, the honeycomb body which is in a moist prefabrication state is frozen and the moisture is removed from the frozen honeycomb body under reduced pressure.

IPC Classes  ?

• C04B 33/30 - Drying methods
• C04B 35/46 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on titanium oxides or titanates
• C04B 35/626 - Preparing or treating the powders individually or as batches
• C04B 38/00 - Porous mortars, concrete, artificial stone or ceramic warePreparation thereof
• F26B 5/04 - Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
• F26B 5/06 - Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing

Abstract

The invention relates to a bending actuator element (1, 40) comprising a protective casing (3) and a bending actuator (4) accommodated therein, and a flat support (6) and a piezoelectrically active coating (7) applied to at least one side thereof. The bending actuator (4) is substantially enclosed by the protective casing (3) and is directly fastened in the protective casing (3) with its fixed end (9). The invention further relates to a bending actuator module (28) having a plurality of said bending actuator elements (1, 40). The fact that the bending actuator (4) is immobilized inside a protective casing (3) allows a unit that can be easily mounted, the risk of being damaged due to the destruction of the piezoelectric coating (7) during mounting or transport being substantially reduced compared to bending actuators of the prior art.

IPC Classes  ?

• D04B 15/78 - Electrical devices

Abstract

A catalyst (1) is specified for the cleaning of oxygenous exhaust gases (5) of a combustion unit, especially of a combustion engine operated with an air excess, comprising a reduction catalyst (2) for the selective catalytic reduction of nitrogen oxides present in the exhaust gas (5) by means of a reducing agent, and an oxidation catalyst (3) installed on the downstream side of the reduction catalyst (2) for oxidizing the reducing agent. It is envisaged that the oxidation catalyst (3) is installed over a region upstream of the reduction catalyst (2) which is 1-19% of the total catalyst volume. The reduction catalyst (2) is composed of a number of individual catalysts (15, 16) together, the oxidation catalyst (3) being installed as the last individual catalyst(s) in the downstream direction. In various uses, the catalyst (1) achieves a high conversion of nitrogen oxides with avoidance of reducing agent slippage and undesired side reactions.

IPC Classes  ?

• B01D 53/94 - Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
• B01J 23/648 - Vanadium, niobium or tantalum
• B01J 23/652 - Chromium, molybdenum or tungsten
• F01N 13/02 - Exhaust or silencing apparatus characterised by constructional features having two or more separate silencers in series
• B01J 37/02 - Impregnation, coating or precipitation

Goods & Services

Catalyseurs chimiques et supports de catalyseurs. Pots d'échappement catalytiques et leurs supports pour usage dans les moteurs à combustion (compris dans cette classe); pots d'échappement catalytiques et leurs supports pour usage dans les véhicules à moteur. Pots d'échappement catalytiques et leurs supports pour usage dans des installations de chauffage (en tant que parties de ces installations).