Do you know the importance of volatile matter control, and the bad results caused if the index is not well controled in range?
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 content must be controlled within a certain range, otherwise it will cause the following results.
If the volatile content is too high, it will cause the following undesirable results as below:
1 Not easy to sinter, poor strength, easy to break.
2 The shrinkage is large, the strength is also poor, and hard breakage may occur.
3 Fast oxidation and fast consumption of electrode paste.
4 It is easy to layer and sinter into a special shape, in addition to the difficulty of lowering the electrode, it is also easy to break.
5 When the electrode is discharged, the load is reduced and the load is increased slowly, which affects the output.
If the volatile content is too low, it will cause the following undesirable results
1 Premature sintering, poor strength, easy to break.
2 Insufficient adhesion, poor strength, and easy to 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 volatile content is worse than too low.
Therefore, the volatile content of the electrode paste must be controlled within a certain range.
The lower the ash content in the electrode paste, the better, but it is limited to the source of the raw material. Generally, it is not higher than 5%. If the ash content is too high, the strength will be poor, the resistance will be high, the power consumption will be high, and the corresponding electrode consumption will also be high. Therefore, ash is also one of the important indicators of electrode paste.
The above indexes are used as the manufacturer's factory standards, but it is not enough to know the amount of ash and volatiles 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 tested for sintering in the laboratory, and passes the mechanical strength, resistivity, porosity and other tests, can it be regarded as conforming to the quality evaluation standard of electrode paste. However, due to this inspection method, the time from sampling to obtaining the measurement result is long and the speed is slow. Therefore, the manufacturer only serves as a reference indicator, but it is also an important indicator.
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