Conference Program - LOPE-C 2011
Conference Program - LOPE-C 2011
Conference Program - LOPE-C 2011
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SCIENTIFIC CONF. | WEDNESDAY-JUNE 29, <strong>2011</strong><br />
Track 5<br />
Sensors and Systems (11:30 am - 01:20 pm) | LOCATION HARMONIE E / LEVEL C2<br />
12:20 pm Sensors produced by powder-filled pastes<br />
Ms Claudia Drescher,<br />
Fraunhofer IFAM, Project Manager, Germany<br />
Due to the complexity of systems or products, health monitoring of devices is important to gain information about the system?s status and to optimize the maintenance rate.<br />
Here different kinds of sensors are needed to e.g. detect temperature changes.<br />
Powder metallurgical sensor coatings offer the advantage of applying a sensor directly onto a device. The functional pastes can be applied to insulated stainless steel,<br />
powder metallurgical parts and ceramics (e.g. alumina) via screen printing technology. The sensor is functionalized during the following heat treatment in which the<br />
properties of the sensor can be influenced by the sintering parameters.<br />
The powder-filled pastes can be produced in high material diversity and allow the use of established printing processes.<br />
The screen printing technology offers the advantages of a low cost, mass production process. The application of a sensor to a device?s surface leads to new integrated<br />
functions of a device. A combination of different sensors is possible due to the possibility of a complex screen layout.<br />
Depending on the quantity to be measured ? i.e. strain, temperature, rotational speed ? different materials are evaluated, e.g. thermocouple standard types (as type T:<br />
Cu-CuNi) are investigated.<br />
At the Fraunhofer IFAM a variety of thick-film sensors have been developed which can be applied directly onto parts. Here investigations on the functionality of strain<br />
gauges or overload sensors, as well as thermocouples have been performed.<br />
Also the deposition of magnetic sensorial structures is possible, which exhibit either hard or soft magnetic properties.<br />
The functionality of the different sensors is tested, depending on the sintering conditions, i.e. temperature, dwell time and atmosphere.<br />
The powder metallurgical produced sensors are checked with adequate testing methods, e.g. a temperature calibration or load tests.<br />
Metallographic investigations of the sintered layers and interdiffusion zones were performed to study the formation and composition of possible phases.<br />
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