Zirconia ceramics low temperature sintering, do you understand?

Zirconia ceramics how to low temperature sintering? With the continuous development of society, zirconia ceramics in the field of structural ceramics has been widely used, zirconia ceramic sintering is a very important step in the process, sintering will directly affect the ceramic processing, so only the sintering temperature is properly adjusted, its embryo will be perfect zirconia ceramics sintering method can be used usually have many methods. Then zirconia ceramics how to low temperature sintering? The following staff from Shenzhen Hyde Precision Ceramics for everyone to introduce:

First, the use of powder sintering at low temperatures

Easy to sinter the preparation of powder is broadly divided into general powder preparation process and special powder preparation methods, the difference between them is mainly the difference in the preparation process. The preparation process referred to here is the chemical composition of the mother salt, mother salt preparation conditions, calcination conditions, crushing conditions.

With the micronization of powder particles, the microstructure and properties of the powder will undergo great changes, especially for the sub-micron one-nanometer powder, which will have unexpected properties in terms of internal pressure, surface activity, melting point and so on. Therefore easy to sinter the powder in the sintering process can accelerate the kinetic process, reduce the sintering temperature and shorten the sintering time.

Second, the introduction of additives for low-temperature sintering

Additives can make the material show new functions, improve strength, inhibit grain growth, promote sintering and so on. This method can be divided into the following two categories according to the additive mechanism: the introduction of additives to increase the lattice vacancies, easy to diffuse, so that the sintering rate is accelerated; the introduction of additives so that the liquid phase is generated at lower temperatures, the emergence of the liquid phase crystals can be made viscous flow, promoting the sintering.

The above zirconia ceramics how to low-temperature sintering is introduced here, zirconia ceramics are widely used in industrial production, zirconia ceramics prepared by low-temperature sintering, you can make the energy consumption to reduce the cost of the product. Generally high quality zirconia ceramic surface is white, containing impurities in yellow or gray, but through the sintering will become yellow.

Zirconia ceramics sintered why yellow:

1, you use the sagger or layer burner plate is not new, if it is new need to burn a few times before sintering the product;

2, the temperature of the high-temperature zone is not too high; the furnace is not a well-ventilated smoke pipe;

3, the product is not stacked too much. Not burned in an oxidizing atmosphere, there are oxygen vacancies, the product will have color.

4, zirconia ceramic raw materials contain impurities. Iron impurities in the oxidation is going to turn yellow. Yttrium doped more will also have a color also recommended to open the furnace cover, the effect may be completely different.

5, the last may be the furnace internal pollution problems.

Zirconia ceramic color yellowing treatment method:

Use white vinegar and lemon peel. First of all, the dirt on the surface of the sanitary ware will be scrubbed clean, and then use a soft cloth dipped in a little white vinegar to wipe the surface of the sanitary ware or lemon peel wipe, sanitary ware will be bright as new.

The above zirconia ceramics sintered after why will turn yellow is introduced here, sintered Y toughened zirconia ceramics at 1450 ° is white. The molecular weight of zirconia is 123.22, the theoretical density is 5.89g/cm3, and the melting point is 2715℃.