An electromagnetic heating layer of porcelain container and its making method

Abstract

This invention relates to an electromagnetic heating layer and its manufacturing method for ceramic containers characterizing that the layer is composed of Ag, melting point adjusting material and surface tension adjusting material, in which, content of Ag is 75-98%, that of the melting point adjusting material is 0.5-1.5% and the surface tension adjusting material is 1.5-23.5%.

Description

Technical field: [0001] The invention relates to an electromagnetic heating layer and a manufacturing method thereof. Background technique: [0002] There are two types of existing electromagnetic heating layers for ceramic containers: one is stainless steel, and the heat transfer effect of this electromagnetic heating layer from stainless steel to ceramic containers is poor, and stainless steel is easy to lose heat after being cooled and expanded during use. The ceramic container falls off; the other is to adopt a ceramic material with electromagnetic heating properties to sinter on the bottom of the ceramic container to form, this electromagnetic heating layer, as disclosed in Chinese patent application 200610052119.9, is made of iron, silver and melting point adjustment materials (such as Bismuth oxide) and surface tension adjusting materials (such as boric acid), in which iron is the main substance, accounting for more than 70%. During production, the above substances ar...

AI Technical Summary

Problems solved by technology

[0002] There are two types of existing electromagnetic heating layers for ceramic containers: one is stainless steel, and the heat transfer effect of this electromagnetic heating layer from stainless steel to ceramic containers is poor, and stainless steel is easy to lose heat after being cooled and expanded during use. The ceramic container falls off; the other is to adopt a ceramic material with electromagnetic heating properties to sinter on the bottom of the ceramic container to form, this electromagnetic heating layer, as disclosed in Chinese patent application 200610052119.9, is made of iron, silver and melting point adjustment materials (such as Bismuth oxide) and surface tension adjusting materials (such as boric acid), in which iron is the main substance, accounting for more than 70%. During production, the above substances are made into slurry, then applied to the bottom of the ceramic container, and then sintered. Since this kind of electromagnetic heating layer uses iron as the main material, it is difficult to ensure that the iron will not be oxidized during high-temperature sintering, and the oxidized iron does not have electromagnetic heating performance. In order to minimize the oxidation of iron during the sintering process, the measures taken Generally, the electromagnetic heating layer has a certain thickness, such as 0.3-0.8mm disclosed in the above-mentioned patent. Even so, part of the iron will inevitably be oxidized, and, limited by the thickness of the electromagnetic heating layer, the slurry is generally passed through The method of smearing is to smear the bottom of the ceramic container, so that the thickness of the electromagnetic heating layer will be uneven, and the heating of various parts of the electromagnetic heating layer will be uneven, so that the bottom of the ceramic container will be heated unevenly. Moreover, because part of the iron is in the form of oxide Residing in the electromagnetic heating layer, these substances reduce the heat transfer effect of the electromagnetic heating layer and affect the heating efficiency of the electromagnetic heating layer

Images