The control items of electrode paste include fixed carbon, volatile matter, ash and moisture, etc. Generally, all four items can be calculated by analyzing the three items of volatile matter, ash and moisture. The volatile matter must be controlled within a certain range, otherwise it will cause the following results.
If the volatile matter is too high, it will cause the following undesirable results
1 It is not easy to sinter, the strength is poor, and it is easy to softly break.
2 The shrinkage is large, the strength is also poor, and hard fracture may occur.
3 Fast oxidation and consumption of electrode paste.
4 It is easy to be sintered into special shapes in layers, and it is easy to break apart in addition to the difficulty of lowering the electrode.
5 When the electrode is discharged, the load is reduced and the load is increased slowly, which affects the output.
If the volatility is too low, it will cause the following undesirable results
1 Premature sintering, poor strength, easy to hard break.
2 Insufficient adhesion, poor strength, and easy to hard break.
3 The contact resistance between the electrode and the conductive jaw plate is large, which affects the power consumption and the life of the jaw plate.
If the above situation is compared, too high volatility will have worse consequences than too low.
Therefore, the volatile matter of the electrode paste must be controlled within a certain range. See section 4 for specific indicators.
The lower the ash content in the electrode paste, the better, but it is limited to the source of raw materials, generally not higher than 5%, too high ash will cause poor strength, high resistance, high power consumption, and high electrode consumption. Therefore, ash is also one of the important indicators of electrode paste.
The above indicators are used as the factory standards, but it is not enough to just know the ash and volatile content to judge the quality of the electrode paste. To determine whether the quality of the electrode paste meets the requirements. Only when the sample is sintered in the laboratory and passed the tests of mechanical strength, electrical resistivity, porosity, etc., can it be considered as meeting the quality appraisal standard of electrode paste. However, because of this inspection method, it takes a long time from sampling to obtaining the measurement result, and the speed is slow. Therefore, the manufacturer is only used as a reference index, but it is also an important index.