Method for producing a pin heater
AssigneeRobert Bosch GmbH
InventorsGuenter Knoll, Gert Lindemann, Wilfried Aichele, Friederike Lindner, Harry Schlachta
Life of this patent
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Abstract
A method is proposed for manufacturing a pin heater that has a substantially internal insulating layer and an external conductive layer, the two layers composed of a ceramic composite structure, wherein before the pin heater is sintered, its shaping is accomplished by way of the ceramic injection molding technique or by cold combined axial/isostatic pressing.
Claims8
A method for manufacturing a pin heater having a ceramic composite structure including a substantially internal insulating layer and an external conductive layer, the method comprising:
- shaping the pin heater by way of a ceramic injection molding technique or by cold combined axial/isostatic pressing;
- after the pin heater has been shaped, sintering the pin heater.
A method for manufacturing a pin heater having a ceramic composite structure including a substantially internal insulating layer and an external conductive layer, the method comprising:
- producing an insulating ceramic powder mixture that will become an insulating component of the composite structure after sintering wherein a metal silicide content in the insulating component is 25-45 wt %;
- producing a conductive ceramic powder mixture that will become a conductive component of the composite structure after sintering wherein the metal silicide content in the conductive component is 50-65 wt %;
- mixing the insulating ceramic powder mixture with a first binder system to produce an insulating injection-moldable mixture;
- mixing the conductive ceramic powder mixture with a second binder system to produce a conductive injection-moldable mixture;
- injecting the insulating injection-moldable mixture and the conductive injection-moldable mixture to form the insulating layer and the conductive layer by two-component injection molding;
- binder removal processing and presintering of the layered composite structure;
- and
- main sintering of the layered composite structure.
A method for manufacturing a pin heater having a ceramic composite structure including a substantially internal insulating layer and an external conductive layer, the method comprising:
- producing an insulating ceramic powder mixture that will become an insulating component of the composite structure after sintering wherein a metal silicide content in the insulating component is 25-45 wt %;
- producing a conductive ceramic powder mixture that will become a conductive component of the composite structure after sintering wherein the metal silicide content in the conductive component is 50-65 wt %;
- axial prepressing of the insulating ceramic powder mixture;
- producing a layered composite structure from the axially prepressed insulating ceramic powder mixture and the conductive ceramic powder mixture;
- axial prepressing of the layered composite structure;
- cold isostatic final pressing of the layered composite structure;
- profile grinding or lathe-turning of the layered composite structure before or after at least one of binder removal processing and presintering of the layered composite structure;
- and
- main sintering of the layered composite structure.
Dependencies are inferred from the claim text.