A kind of molding method of composite saggar

Abstract

The invention discloses a method for forming a composite saggar, comprising the following steps: (1) respectively preparing anti-thermal shock material and anti-erosion material, and using an anti-erosion inner layer blank mold to pre-compress the anti-erosion material to obtain a pre-compression resistance Erosion layer; (2) put the pre-compression anti-erosion layer into the saggar forming mold, then add the anti-thermal shock material, and press and form the saggar body twice; (3) demoulding and calcining the saggar body are obtained The composite saggar. In the molding method of the invention, the anti-erosion layer is pre-formed first, and the anti-erosion material will not be impacted when the anti-thermal shock material is added, the distribution of the anti-erosion material is more uniform, the stability is higher, and the production quality is more guaranteed; After pre-pressing, the robot can directly grab and place it into the saggar forming mold, which is easy to realize automatic production.

Description

technical field [0001] The invention belongs to the field of sintering devices, and in particular relates to a preparation method of a saggar. Background technique [0002] Lithium battery cathode materials and saggars for firing some highly aggressive materials require both strong corrosion resistance and good thermal shock resistance. However, the corrosion resistance and thermal shock resistance of existing refractory and ceramic materials are contradictory, that is to say, materials with good corrosion resistance such as corundum, magnesia-aluminum spinel, alumina, zirconia and other materials have thermal shock resistance They are very poor, and materials with good thermal shock resistance such as cordierite, mullite, spodumene, aluminum titanate, etc. have poor corrosion resistance. [0003] In order to solve the above contradiction, two methods are generally adopted at present. One is the integral molding method, which is the most basic method for the production of ...

AI Technical Summary

Problems solved by technology

However, some materials to be fired shrink less or do not agglomerate during calcination, and the separation distance between the materials to be fired and the wall of the sagger is relatively small, especially the arc part of the inner bottom of the sagger is completely in contact, so the anti-erosion layer must extend to the sagger On the wall of the bowl (the formed saggar is similar to figure 2 ), in this case, the feeding process of batch feeding and one-time molding is basically impossible to complete

2. Since the performance of the two blanks of the anti-erosion layer and the anti-thermal shock layer is quite different in terms of expansion coefficient and shrinkage deformation during high-temperature firing, in addition to the requirements for the formula, the inner layer is also required in the operating process. The thickness of the material, the uniformity of the blank, and the uniformity of the thickness of the feeding all have extremely high requirements. In addition, the sagger is not like a flat plate, the mold structure is relatively complicated, and the automatic feeding is extremely difficult. Uniform phenomenon, if it is partially thick, it will cause firing cracks, if it is partially thin, it is easy to peel off during use, and local lack of material often occurs

Therefore, this production method is very easy to cause unstable product quality in both production and use.

3. The batch feeding and one-time molding are all similar Figure 5 The mold and molding method shown above add the anti-erosion material layer first and then the thermal shock-resistant material layer. Therefore, during the feeding process, since the anti-erosion material added for the first time is loose, when the thermal shock-resistant material is poured in for the second time When it is used, it is easy to have an impact on the former seed material, resulting in uneven thickness of the anti-erosion layer, resulting in the situation in the above 2

[0005] Therefore, there is no significant improvement in the quality of the actually produced saggar and the overall pressed saggar, but sometimes the fluctuation of quality increases instead.

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