Investigation of long-term stable joints for the assembly of pressure sensors for process monitoring in electrolyzers and system storage tanks
|Untersuchung von langzeitstabilen Fügeverbindungen zum Aufbau von Drucksensoren zur Prozessüberwachung in Elektrolyseuren und Systemspeichern
|1st April 2017 - 30th March 2020
|Alkaline water electrolysis, so called because the electrolyte is 25 percent potassium hydroxide solution, has been mature for decades. The electrodes are immersed in the electrolyte and produce the desired hydrogen. The waste product is potassium hydroxide solution. Compared to atmospheric electrolysis, pressure electrolysis offers the advantage that the product gases hydrogen and oxygen are available to the user at a pressure of 30 bar. If alkaline water electrolysis is to be used for sustainable hydrogen production as a method for intermediate storage of renewable energy, many plants are required. In order to keep the investment costs low and to increase the economic efficiency, the plants themselves and the control system have to be optimized. This project is dedicated to the research and development of special low-cost hydrogen-resistant pressure sensors for these plants as part of a multisensor, which detects not only pressure but also temperature, concentration of hydrogen and residual gases. Basically, many metals tend to become brittle when exposed to hydrogen. Hydrogen atoms diffusing into the metal lattice change the strength of the material. In the worst case, this leads to cracks in the material, the pressure sensor becomes leaky or even completely destroyed. The basis of the proposed solution is a combination of a silicon pressure sensor chip and a steel pressure sensor with thin-film measuring resistors. Strain-sensitive resistors made of silicon are joined on a suitably shaped bending plate made of steel. The first joining tests using anodic bonding and subsequent temperature treatment confirm a high strength of the joints.
The project on which this report is based was funded by the German Federal Ministry of Education and Research under the grant number 03ZZ0724D.
|Contact us about this project via our business unit MEMS
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