The additives developed for technical ceramics are characterised by their high degree of purity.
This is the key feature of all approved additives in this field. These additives have in common that they allow the manufacture of a wide range of articles.
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Zschimmer & Schwarz
Ceramic AuxiliariesMax-Schwarz-Strasse 3–5
56112 Lahnstein | DET +49 2621 12-485
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During the manufacture of ceramic products, energy costs have a considerable share in the overall expenses of the final product. Deflocculating additives help to save water and energy resources, and to increase the production output. The slip properties (viscosity, thixotropic behaviour, structural viscosity, dilatancy, rheopexy and Newtonian flow behaviour) can be adjusted according to the customer’s requirements.
Pressing agents and lubricants are used in pressing and in plastic bodies, where they optimise the shaping properties. They reduce internal friction of the body, leading to a more homogeneous compaction and, thus, contributing to a reduction of microstructural tensions. Friction between the article and the mould wall is reduced. An increase in effective mould life is, therefore, possible. The sticking tendencies of the body to the mould wall can also be decreased. In the compaction of spray granulates, pressing agents can further act as softeners, so that during pressing, a simple breakdown of the residual granulate structures becomes possible.
If a composition does not contain sufficient plastic raw materials with binding properties, the temporary binders can be utilised to increase the green and dry breaking strength of the body, as well as to improve the edge strength. This is necessary for the handling ability of the shaped articles in the subsequent technological processes and the safe intra-company transport. Temporary binders can be used for plastic shaping via extrusion, dry pressing as well as for the production of spray dried or build-up granulates.
Release agents are generally applied onto the mould, where they act as a lubricating and separating agent between the moulded component and the mould. To reduce friction between the extruder screw and die during the extrusion process, the release agents can be already mixed into the bodies during preparation. Compared to the conventional mineral oils, the ZUSOPLAST O types are characterised by a strongly reduced odour nuisance. Additives without oil mist formation are available for the spraying process.
During the manufacture of ceramic products, energy costs have a considerable share in the overall expenses of the final product. Deflocculating additives help to save water and energy resources, and to increase the production output. The slip properties (viscosity, thixotropic behaviour, structural viscosity, dilatancy, rheopexy and Newtonian flow behaviour) can be adjusted according to the customer’s requirements.
The efficiency of the pressure casting process, as well as the cost effectiveness of conventional slip casting, are dependent on the output per unit time, which in turn depends on the casting rate. The use of filtration agents leads to the agglomeration of fine particles, and a more even de-watering of the casting slip is the result. A regular density and a uniform shrinkage allow the production of a homogeneous cast that is free from internal stresses. To a large extent, separation and sedimentation phenomena are prevented. Furthermore, filtration agents confer good interlocking at transitions from hollow casting to core casting, and better removal from the mould.
If a composition does not contain sufficient plastic raw materials with binding properties, the temporary binders can be utilised to increase the green and dry breaking strength of the body, as well as to improve the edge strength. This is necessary for the handling ability of the shaped articles in the subsequent technological processes and the safe intra-company transport. Temporary binders can be used for plastic shaping via extrusion, dry pressing as well as for the production of spray dried or build-up granulates.
Plasticisers, acting as swelling agents, increase the plasticity of a body. These additives absorb a portion of the available preparation water and increase the workability of the body, thanks to their swelling ability. This makes it possible to substitute plastic clay components by non-plastic materials. On account of extrusion body surfaces being dull in many cases, it is recommended to combine plasticisers with pressing agents and lubricants.
Pressing agents and lubricants optimise the shaping properties of extrusion bodies. They reduce internal friction of the body, leading to a more homogeneous compaction and, thus, contributing to a reduction of microstructural tensions. Friction between the article and the mould wall is reduced. An increase in effective mould life is, therefore, possible. The sticking tendencies of the body to the mould wall can also be decreased.
Release agents are generally applied onto the mould, where they act as a lubricating and separating agent between the mould component and the mould. To reduce friction between the extruder screw and die during the extrusion process, the release agents can be already mixed into the bodies during preparation. Compared to the conventional mineral oils, the ZUSOPLAST O types are characterised by a strongly reduced odour nuisance. Additives without oil mist formation are available for the spraying process.
Special cleaning agents prevent an early aging of plastic pressure casting moulds. Our low-hazardous cleaning agents have excellent wetting properties to loosen deposits, and owing to their complexing properties, they allow the rinsing out of multivalent ions. These cleaning agents can either be used for cleaning the mould pores and capillaries, or for cleaning the mould surface.
On account of their surface activity, plaster additives act as deflocculants, which means the solids content in the plaster slurry can be increased whilst maintaining the same processing consistency. This increase in the plaster/water ratio brings about an increase in the mechanical resistance which particularly becomes obvious in the form of an improved abrasion resistance and hence leads to a prolonged working life of the plaster mould.
The use of release agents permits good separation of the plaster negative cast from the master mould. Owing to the water-soluble emulsion system, the absorbency of the plaster moulds will be unaffected.
