How to dehumidify the raw materials of alumina ceramics

How should the raw material of alumina ceramic be dehumidified：

The raw material of alumina ceramic structural parts is polyethylene, which itself is not easy to absorb moisture, but in the long-distance transportation and storage process, the surface of the raw material is easy to absorb some water, black raw materials will be more serious, the surface of the bag will be found water layer, even dripping phenomenon. So how do we dehumidify it?

There are two kinds of drying equipment for raw materials of alumina ceramic structural parts, namely, hot air dryer and dehumidification dryer.

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The principle of hot air dryer is to use hot air to blow away the moisture in the raw materials of alumina ceramic structural parts. The temperature range is 80-1OOc, and the drying time is mostly 40-60min. Hot air dryer is an open system that can only remove moisture from the surface of raw materials.

The principle of dehumidification dryer is to replace the water in the hot air through the molecular sieve, and then use the drying wind to blow away the water in the raw material of alumina ceramic structural parts. Using this method, the water in the raw material can be reduced to less than 0.1%, the drying temperature is generally 80-100oc, and the drying time is generally 2-3h. The dryer with stable performance can reduce the dew point of the drying wind to below -30℃; If the moisture content of raw materials is greater than 0.08%, use a hot air dryer for pre-drying.

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Method for grinding zirconia toughened alumina material

Zirconia toughened alumina high temperature structure strength, has a negative resistance temperature coefficient, so in certain circumstances is the need for the product of the material for a certain degree of grinding, its specific methods are as follows:

1, mechanical grinding: large area of zirconia toughened alumina construction, in order to improve work efficiency, can use mechanical grinding method, such as electric grinding machine (disc type, vibration type).

2, dry grinding: using sandpaper for grinding. It is suitable for grinding hard and brittle paint. The disadvantage of grinding zirconia toughened alumina material is that there will be a lot of dust in the operation process, which will affect the environmental health.

3, wet grinding: water sandpaper dipped in water or soapy water polishing. Water grinding can reduce wear marks, improve the smoothness of the coating, and save sandpaper and labor. But after water grinding, attention should be paid to spraying the lower layer of paint. First, it is necessary to wait for the water grinding layer to completely dry before painting the lower layer of paint, otherwise the paint layer is easy to white. In addition, the substrate with strong water absorption is not suitable for water grinding.

In order to ensure that the quality of zirconia toughened alumina is better, it is necessary to polish its material when processing, so this work is very important.