Research areas

 

CELCORR vision of enhancing humidity robustness of electronic system

Humidity effects on electronics causing corrosion reliability issues, which influence the functionality of the electronics in an intermittent and permanent manner can be tackled by: (i) Intrinsic methods meaning that by enhancing the inherent humidity resistance of PCBA or components or (ii) Extrinsic methods such as methods that reduce humidity entry to system, and therefore contact with PCBA or components for example conformal coating, potting, or proper encapsulation/enclosure controlling humidity entry. Method (i) and (ii) are interdependent as shown in the figure below because the level of protection needed from (ii) depends on the humidity boundary that the PCBA can handle without failure.

 

Activities at CELCORR is based on this vision aiming at building capabilities for “Pro-active design for preventing humidity related reliability issues and developing protection and prediction capabilities”. Center has research and development activities dealing with Intrinsic (i) and extrinsic (ii) aspects.

Intrinsic aspects and methods: Enhancing humidity robustness at Material, component, and PCBA level 

Humidity and PCBA interaction: Understanding water film build up and characteristics

Contamination issues, humidity, and corrosion reliability issues

Soldering process optimization for cleanliness: Reflow, Wave, and Hand soldering

Solder chemistry effects on humidity robustness and modification of flux chemistry

Solder mask influence on humidity related failure issues

PCBA polymer materials: moisture absorption and de-gassing issues

Predicting humidity effects on PCBA using electrochemical models

Predicting humidity effects on PCBA using probabilistic models

Corrosion reliability issues of electrical contacts and connectors

Sulphur corrosion issues of electronic components and PCBA

DC and AC based test methods for humidity effects on electronics

Testing PCBA cleanliness level: Qualitative and Quantitative methods

 

Extrinsic aspects and methods: Conformal coating and potting, enclosure design for humidity control, and integrated sensor for monitoring humidity effects

Conformal coating for humidity protection and performance

Potting materials for humidity protection and performance

Enclosure design for humidity control and semi-empirical modelling tools for design analysis

Climate coupled design possibilities using climate data analysis and clustering

Methodologies for climatic testing at System level and failure analysis

 

Other activities at the Centre:

MEMs reliability issues and prevention

Humidity aspects of Zinc air and Li ion batteries used for hearing aid applications

Humidity related reliability issues of hearing aids and enhancing robustness

Product support work and short industry projects based on humidity and electronics

Failure analysis methodology for electronics and advice on humidity issues


https://celcorr.dtu.dk/about-us/research-areas
6 AUGUST 2020