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- Grönqvist, Hans, et al.
(author)
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Unit for Investigation of the Working Environment for electronic units in harsh environment
- 2017
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In: Advanced Microsystems for Automotive Applications 2017. - Cham : Springer. - 9783319669724 ; , s. 13-22
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Conference paper (peer-reviewed)abstract
- When electronic equipment is used in harsh environments with long expected lifetimethere is a need to understand that environment more in detail. This situationis today a reality for many application areas including the automotive sector,heavy industry, the defense sector and more.To fully understand the working environment a unit has been developed to monitorphysical data such as temperature, vibration, humidity, condensation etc. to beused in the product development phase for new products.The paper presents the underlying principles for the ESU (Environmental SupervisionUnit) and details on the design.
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| 2. |
- Johansson, Emil, et al.
(author)
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Influence of Resin Composition on the Defect Formation in Alumina Manufactured by Stereolithography
- 2017
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In: Materials. - : MDPI AG. - 1996-1944. ; 10:2
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Journal article (peer-reviewed)abstract
- Stereolithography (SL) is a technique allowing additive manufacturing of complex ceramic parts by selective photopolymerization of a photocurable suspension containing photocurable monomer, photoinitiator, and a ceramic powder. The manufactured three-dimensional object is cleaned and converted into a dense ceramic part by thermal debinding of the polymer network and subsequent sintering. The debinding is the most critical and time-consuming step, and often the source of cracks. In this study, photocurable alumina suspensions have been developed, and the influence of resin composition on defect formation has been investigated. The suspensions were characterized in terms of rheology and curing behaviour, and cross-sections of sintered specimens manufactured by SL were evaluated by SEM. It was found that the addition of a non-reactive component to the photocurable resin reduced polymerization shrinkage and altered the thermal decomposition of the polymer matrix, which led to a reduction in both delamination and intra-laminar cracks. Using a non-reactive component that decomposed rather than evaporated led to less residual porosity.
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| 3. |
- Karlsson, Helene, et al.
(author)
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Quality assurance of encapsulation architecture, including subsequent washing process for permanently mounted wearable sensors
- 2018
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In: 2018 IMAPS Nordic Conference on Microelectronics Packaging (NordPac). - 9789526815053 ; , s. 14-23
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Conference paper (peer-reviewed)abstract
- The overall objective of the project wearITmed, Wearable sensors in smart textiles, is to develop a novel wearable sensor system demonstrator. This sensor system aims to monitor symptoms of neurological disorders such as epilepsy, Parkinson’s disease and stroke. The wearable sensor system demonstrator, including both integrated gyros/accelerometers and textile sensors, is useful for the evaluation of clinically relevant movement patterns and other physiological parameters, and further to establish disease discriminating and treatment responsive objective variables. The work presented in this paper is focused on ensuring that the wearable sensor system can be cleaned and washed without first removing the electronics. The work includes three main areas; the adhesion and architecture, the molding and finally the washing test performance. Standard wettability and peel tests (Volvo Standard STD 185–0001) were performed on standard test board IPC-B-5 and IPC-9202 test vehicle for selecting the best adhesive and encapsulation materials in form of an epoxy (Epotek 302–3M) and a medical approved silicone (Nusil MED-6019). The molded components were washtested (Standard SS-EN ISO 6330:2012) followed by testing of the electrical resistance (Standard IPC-9202). As a result a total of 22 garments were produced with four individually mounted boards in each garment. The tests showed that the wearable sensors passed the washing tests and were still functional after 10 repeated washing cycles without any change or degradation in resistance or sign of electrical failure. The wearable electronics therefore meets the requirements of being simultaneously resistant to; water, temperature (40 °C), chemical detergents and dynamic forces.
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