Application of ruthenium or ruthenium compound in preparing thick-film heating element, thick-film heating element with ruthenium or ruthenium compound, and resistance paste thereof

Abstract

The invention discloses an application of ruthenium or a ruthenium compound in preparing a thick-film heating element, the thick-film heating element with the ruthenium or the ruthenium compound, and a resistance paste thereof. According to the invention, through providing a new resistance paste of the thick-film heating element, namely replacing a conductive phase by the ruthenium or the ruthenium compound by means of existing thick-film resistance paste preparing technology, problems of influence degree increase to a square resistance and high reheating linear change rate are settled on condition that glass phase in the resistance paste increases to a certain amount in prior art. Through a large number of researching experiments, an application discovers a fact that controllable square resistance change and stable reheating linear change are realized after glass phase increase through replacing the conductive phase in an existing palladium silver paste by the ruthenium or ruthenium compound. Based on the fact, the applicant provides the resistance paste which comprises the ruthenium or the ruthenium compound. The resistance paste can be successfully applied in a parallel thick-film heating circuit, and the relatively large square resistance can ensure adjustable and controllable circuit resistance after parallel connection. The application of the ruthenium or the ruthenium compound, the thick-film heating element and the resistance paste effectively settle a problem of easy serial-connected thick-film heating circuit damage in prior art. Furthermore the invention provides a thick-film heating circuit in a parallel-connection manner.

Description

technical field [0001] The invention relates to thick-film heating technology, in particular to the application of ruthenium or ruthenium compounds in preparing thick-film heating elements, thick-film heating elements containing the substance and resistance paste. Background technique [0002] The stainless steel thick film heating element is mainly composed of a stainless steel substrate, an inner insulating medium layer, a resistance heating layer and an outer insulating medium layer from the inside to the outside. The water flows through the inner wall of the stainless steel, and the thickness of the inner insulating medium layer is about 100 microns. The heat conduction distance from the heating layer to the stainless steel substrate is short, so the thermal resistance is small and the thermal response speed is fast. Thick film heating belongs to surface heating, and the overall heating is relatively uniform, and the heating efficiency will not be reduced due to a large ...

AI Technical Summary

Problems solved by technology

However, since the palladium-silver paste cannot prepare a large resistance paste, the parallel heating circuit has not been used in the thick film heating circuit.