After the electrode paste sample is fired at 900°C, its mechanical and electrical properties are measured, which can provide valuable information for evaluating the stress-bearing deformation and current conductivity of the fired electrode.
The method specified in the People’s Republic of China Ferrous Metallurgy Industry Standard [Roasting Method for Carbon Paste Test Samples GB/T3425-1982] (this standard has not been revised for many years) is used to prepare electrode paste baking samples. The production method is to first heat the electrode paste, then put it into a thick cylinder made of iron sheet, and then roast it to 900°C in a small baking furnace.
There are two preparation methods for electrode paste baking samples used in the literature: baking after pressure forming and baking without pressure, as shown in Figure 8. The holding method is to first heat the electrode paste to 160°C, put it into the mold for compression molding, and apply greater pressure, and then slowly fire the sample to 500°C. The latter is to put the electrode paste into a mold, slowly heat it to 500°C under a lower constant pressure, and then fire the sample to 900°C. Generally, if the compression performance of the electrode paste is very good, there is no big difference between the two methods, but in the latter method, sometimes the compression is not good, and the result is that the mechanical properties of the sample are very poor. This also shows that the plasticity of the electrode paste is in a lower range, which will cause problems with the electrode.
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