Alumina hydrate is commonly used as a raw material in many chemical products. During the production process, it undergoes shaping. However, certain factors can affect the shaping outcome. This article will introduce the specific factors influencing its shaping effect.
Particle powders with smaller or larger particle sizes have poor ability to be compacted into shape under certain pressures. Fine powder particles have a smaller mass and a larger specific surface area, resulting in greater interparticle adhesion during compaction, which increases the porosity and decreases the bulk density. When fine powders are compacted under pressure, the large amount of air distributed between the particles escapes along a plane perpendicular to the direction of pressure, causing delamination. Additionally, powders are composed of solid particles with a high degree of dispersion and possess certain fluidity.
2. The fluidity of the powder also affects the filling and filling speed during molding. It is evident that the molding effect of aluminum hydroxide is closely related to the particle size and particle size distribution of the powder. When the powder particles are fine and have a certain particle size distribution, it can reduce the air gap in the molding process, increase the loose stacking density, and thereby benefit the density and strength of the molded body after molding.
3. The density of the molded green body is related to the pressure applied to the powder. As the powder begins to be compressed, a large number of particles undergo relative displacement and sliding, leading to a redistribution of positions and a reduction in porosity. The greater the pressure, the more displacement and particle rearrangement occur, with pores disappearing faster. This results in a higher density and strength of the green body, forming it rapidly. Additionally, the duration of the compression also affects the molding effect of aluminum hydroxide.
In summary, these are some factors affecting the molding effect of aluminum hydroxide. Its molding is highly susceptible to these factors. Therefore, during the molding process, we should pay attention to these influencing factors.
