Misleading properties of dehydration elements

Misleading properties of dehydration elements

(1) Purity

Given this characteristic, it is often mistakenly assumed that many of the operational benefits are obtained from 100% pure ceramics. But in many cases, the opposite is true. The performance of engineering ceramics can be improved by utilizing catalysts, binders and other trace elements. However, this does not apply to alumina and some other ceramic materials (eg silicon nitride). Some of these vitreous additions are chemically attacked, making the surface porous and rough. While higher purity ceramic materials are more resistant to chemical attack, other mechanical properties such as toughness may be sacrificed.

(2) Hardness

The surface hardness of a ceramic, which can be measured by its ability to resist scratching by another material, affects ceramic wear resistance to some extent, but cannot predict the rate at which the forming wire wears. Due to the complexity of ceramic crystal structure and hardness testing, caution is required when applying hardness values to predict wear resistance or impact on forming wire life. Actual reference information and empirical data are important.

(3) Grain size

The average value, main value and range of ceramic particle size can reflect the internal structure of ceramics, but cannot be used as a basis for predicting the performance of ceramic components in the paper machine.

(4) Friction coefficient

The coefficient of static or kinetic friction generated when the forming wire slides on the ceramic surface is very sensitive to the contact conditions, so no single data can be used. The drive load fluctuates wildly with factors such as ceramic structure, contact pressure, and amount of lubricating water. When the lubrication effect is poor, the wear of the forming wire is related to friction.

There are many fluctuations and complex contact conditions that need to be considered when analyzing the coefficient of static or dynamic friction of a forming mesh as it slides on a ceramic surface, so there is not yet a good description to define the friction conditions in this application area. The main concern of papermakers is the wear and transmission load of the forming wire, which varies greatly due to factors such as ceramic structure, contact pressure during application, amount of lubricating water, and type of forming wire. Selection of suitable wear resistant ceramic materials, regular grinding and maintenance of the ceramic edges will improve low friction operation.