Production

Alumina Systems GmbH as his own production for ceramic moulding material. Ceramic green bodies are produced by dry and isostatic pressing. Large sized bodies can be slipcasted. The green bodies are shaped in CNC-controlled processing machines. More complex geometries can be 3D-printed. Ceramic sintering is done in five gas fired one cubic meter elevator kilns and several electrical heated chamber kilns. Depending on the different specifications the fired ceramic will be grinded. Most of the parts are coated outside with a self-developed glaze in order to create a dirt-repellent surface on the creep distance. This glaze is specially adjusted to meet the high voltage requirements. The ceramic is metallized with MoMn by screen printing using flat and round printing process. The passive brazing technology ends up in two significant advantages: excellent rupture strength on the ceramic (>>250MPa) and the generating of a brazing meniskus, what leads to a high process stability for vacuum tighness. After the sintering at 1.400° C in H2 / N2-gas the metallized surface is nickel plated. The nickel layer serves as soldering flux. In our own electroplating department we can do galvanic and chemical nickel plating up to 50 μm. For special applications we have a production line for flash gold plating for Au-layers till 200nm. Beside the passive braze process we are also able to active braze . This is needed if stainless stell or other materials should prevented from oxidation in protection gas environment. All our parts are nickel plated in our in house nickel plating line. If needed we can nickel plate parts after brazing to protect them from corrosion.