Abstract: The invention relates to a process for producing a metal-coated, metallized component of aluminum nitride ceramic in the steps:preparation of a metallizing paste comprising a pulverulent glass of the MnO--Al.sub.2 O.sub.3 --SiO.sub.2 system and a refractory metal powder,application of the metallizing paste to the component surface,firing the component coated with metallizing paste at a temperature >1100.degree. C. under a reducing moist gas atmosphere of hydrogen-containing nitrogen,coating the metallized component with metal by means of metal plating,wherein, during the heating up of the ceramic component coated with metallizing paste, the atmosphere is humidified with water vapor so that the water vapor content in the temperature range between 800.degree. C. and 1050.degree. C. corresponds to a dew point of >295 K and the water vapor content outside this temperature range corresponds to a dew point of >295 K.

Abstract: A component of aluminum nitride metallized with a metallizing paste containing: (i) a pulverulent glass of the MnO--Al.sub.2 O.sub.3 --SiO.sub.2 system as an adhesion promotor having a mean particle size of 2-15 .mu.m; (ii) a refractory metal powder having a mean particle size of 1-4 .mu.m; and (iii) an organic resin dissolved in a suitable solvent and/or a screen printing oil is disclosed. The metallizing paste preferably has a viscosity of 50-100 Pa.multidot.s when applied by screen printing, and a viscosity of <5 Pa.multidot.s when applied by dipping. The component of aluminum nitride metallized with the metallizing paste has at least one metal layer deposited on the metallizing paste, and the at least one metal layer applied has a bonding strength given by mean pull-off values of .gtoreq.3.5 kN/cm.sup.2.

Abstract: A process for producing a plate from a brittle material Which can be individually separated by breaking to form one or more smaller platelets. In this process, laser scoring is used to produce in a single plate of large dimensionsa parallel first predetermined breaking points respectively at the distance d.sub.a andb parallel second predetermined breaking points respectively at the distance d.sub.b,which intersect the first predetermined breaking points, a and b being integers over 1. The edge zone is removed in the outer region at the distance d.sub.a from the two outer first predetermined breaking points and at the distance d.sub.b from the two outer second predetermined breaking points, so that the remaining plate, without border pieces, contains (a-1).times.(b-1) platelet sections of the same size, which are bounded by in each case four predetermined breaking points.

Abstract: A method for joining a ceramic component to a metal component by brazing where the outer edge of the joining surface on the ceramic component (1) is provided with a chamfer (3) with a chamfer angle (.alpha.) of 15.degree.-45.degree.. The chamfer (3) has an edge radius of .ltoreq.0.3 mm and its minimum height (H) is to be 5-30% of the wall thickness (W) of the ceramic component (1). The joining surface, including its chamfer, is provided with a metallizing layer.

Abstract: An effective seal between the suspension mounting and the glass fiber rod of a compound high voltage insulator is obtained by filling the gap with a mixture of cross-linkable monomers or polymers formed from two or more reactive components, the mixture having a viscosity prior to cross-linking of less than 100,000 mPa.s and a penetration value between 1-500 mm/10 after cross linking. Particularly suitable are polymers based on polyorganodimethylsiloxanes.

Abstract: Process and apparatus for manufacturing heat exchangers from ceramic sheets, wherein different flow channels are stamped from or pressed into the sheets, and the formed sheets are joined together with a laminating agent. The stacking of the individual sheets is effected using apparatus in which the sheets are transported to the forming means, applicator means and laminating means by horizontally and vertically displaceable, rotatable and pivotable suction plates. The organic component of the ceramic sheets is expelled from the heat exchanger block obtained in two heating steps with an intermediate forming operation to bring the heat exchanger block to its final dimensions, and the block then fired between 1,200.degree. to 1,700.degree. C. The actual sintering temperature depends on the particular ceramic used, which may comprise Si.sub.3 N.sub.4, SiC, cordierite and/or semiconductive barium titanate compounds.