Algorithm for ceramic firing shrinkage 50

The shrinkage rate is calculated as (before r - after r) before r *100%.

The traditional method is to isostatic pressure molding of the made powder under the specified pressure, and then enter the kiln to fire, and then measure the shrinkage, and then adjust the green size appropriately according to the shrinkage rate and the specified pressure to organize production.

However, due to the fluctuation of different equipment, raw materials and milling process, the shrinkage rate is constantly changing, and the fluctuation of porcelain size should be inevitable.

1. When the green billet is formed, the shrinkage rate is controlled by adjusting the pressure to control the compaction density, which is more scientific than simply controlling the pressure to ensure the shrinkage.

2. In the process of powder manufacturing, the loss on ignition of various raw materials can be controlled to ensure the stability of loss on ignition.

3. As long as the loss on ignition is stable, the shrinkage rate can be calculated by compaction density.

The algorithm formula for ceramic firing shrinkage is as follows:

Vessels fired with clay are called pottery, and utensils fired with porcelain clay are called porcelain. Ceramics is a general term for pottery, stoneware and porcelain. All utensils made of clay with two different properties of clay and porcelain clay as raw materials, through batching, molding, drying, roasting and other processes can be called ceramics.

The shrinkage rate of ceramic firing has a great relationship with clay, each batch of clay must be kneaded into a small cone, and after firing first, the shrinkage can be measured to determine the size of the mold.

To calculate the shrinkage ratio of the final finished porcelain to the mold, the height, length and width should be measured at the same time.

Discussion] What is the general shrinkage of ceramic sintering?

Hello dear! 【Discussion】The shrinkage rate of ceramic sintering is generally about 25%. The lower the density of the compact, the greater the shrinkage Recently, BST ceramics have been burned, and the sintering shrinkage rate has reached 25%+, what will be the reason?

Rockingzhang (station contact ta) one is the possibility of fine powder, the other is the possibility of liquid phase volatilization zhouzhou6513 (station in the vertical system of the tremor vertical system ta) ceramic sintering shrinkage and molding process and sintering method are related, generally dry pressing molding (not isostatic pressing) green body, after sintering shrinkage rate of 20%-30% is normal. shelby2857 (contact ta) please advise everyone, press out and finally burn out the feeling that the hole is very dense, but the shrinkage is too large, resulting in the sample is too small, the size is not enough The shrinkage is not easy to control, the pre-firing temperature is too low or the green embryo density is too small.