Ceramics and joining technology
– Raw materials preperation
CERAMICS AND JOINING TECHNOLOGY // RAW MATERIALS PREPERATION // GRANULATION // SHAPING // FIRING PROCESSES // HARD MACHINING // CONTROLS // LABORATORY // CERAMIC-METAL BRAZING // CERAMIC-CERAMIC AND CERAMIC-METAL SOLDERING
At the beginning of a classical ceramic process chain is the mixing and grinding of the raw materials. This process step is performed with the objective of rendering the powder particles in a sufficiently sinter-active form and achieving a homogeneous mix of the different inorganic components in the powder. Special attention is given to the risk of contamination caused by the ingress of foreign substances into the ground product, primarily from the grinding and mixing media as well as the lining of the grinding vessel in direct contact with the ground product. Accordingly, already at the beginning of the ceramic process chain, a key parameter influences the achievable material quality.
Grinding media are frequently used that have a lower degree of purity than the material to be ground. Particles abraded from the grinding media can therefore impair the quality of the ceramic made from the ground material. Especially for components made of high-grade oxide and non-oxide ceramic, it is therefore necessary to use only grinding and mixing media with a purity at least matching that of the material being ground or with abrasion resistance that is so high that the ingress of foreign material into the ground material is negligibly low.