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For the tight closure of ceramic heat pipes, SSiC-to-SSiC bonds were created by high-temperature soldering. The glass solder was heated by diode laser irradiation with a combination of different wavelengths focusing on the joining seam. The design of suitable glass solders belonging to the Y2O3-Al2O3-SiO2 and the MgO-Al2O3-SiO2 material systems is discussed as well as the optimization of the joining process. Regarding potential applications for heat recovery in gasification processes, first experimental results obtained by high-temperature annealing of soldered ceramic-glass bonds are presented. [ABSTRACT FROM AUTHOR]

For the evaluation of deterioration of abrasive suspensions due to the process of abrasive flow machining, abrasive media were examined after varying processing times. By using rheological and granulometric characterization methods it has been shown that variations of rheological behavior and composition of the abrasive medium as well as of particle shape are responsible for the deterioration of the abrasive efficiency. [ABSTRACT FROM AUTHOR]