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Scania Södertälje Heltid

30 Credit – Evaluation of boron nitride for enhancing heat transfer in electric insulation systems

About the job

BACKGROUND

Scania is going through a transformation to become the provider of complete and sustainable transport solutions. High performance electric insulation systems are critical not only for safety but also for the life of electric and electronic components. Since most systems are thermally limited the heat transfer from the copper windings or electric steel, where most of the power losses occur, high power density cannot be achieved efficiently. Electric insulation have very low thermal conductivity and therefore works as thermal barriers. Improved thermal conductivity for electric insulation would therefore potentially give significant improved power density and/or efficiency in the main drive systems of electric vehicles.

TARGET

Addition of high thermally conductive nanostructured additives, is recently considered as an industrial solution. Among variety of possible additives, boron nitride (BN) is attracting more attention. BN is a two-element (boron and nitrogen) counterpart of graphene (carbon) with an extremely high thermal conductivity (as high as 1700–2000 W/m⋅K) while possessing high electrical resistivity, which is the main requirement for an insulation material. The focus for this project is to investigate whether BN addition can improve the heat transfer in specific parts of insulation system compared to common solutions without any additives, and if so, in what way.

ASSIGNMENT

Development of a standard test model system resembling the targeted part of electric motor insulation system will be the first part of the project. Evaluation of different BN-containing materials with the help of the model system with regard to electric and thermal properties will be the next step. Literature study for understanding the temperature transfer phenomenon, chemistry of BN, relevant previous studies on using BN additive and so on, need to be done in parallel to lab work throughout the project. The main focus of lab work will be:

  • Design and assembly of the model system with commercially available BN-containing materials.
  • Characterization of the electrical and thermal properties of the model system.
  • Regular microscopy measurements (optical and electron microscopy) and Partial Discharge (PD).
  • Data analysis after internal and external measurements.

The project will be concluded by a written report and an oral presentation. This Master’s thesis will be done in the department of Materials Technology for Electrification at Scania R&D in Södertälje, Sweden.

EDUCATION

M.Sc. Student in: Material science, Chemical Engineering, Engineering Physics, Physics

Number of students: 1

Start of work: Spring 2021 and ideally no later than February 2021

Estimated duration: 20 weeks, full time 40 hours per week

Language of work: Good knowledge in English is required

Meritorious: Previous lab work experience, Basic chemistry knowledge

Contact person and supervisor

Tiva Sharifi, Ph.D., Development Engineer, Materials Technology, tiva.sharifi@scania.com, 0855371432

Om företaget

Scania is a world-leading provider of transport solutions, including trucks and buses for heavy transport applications combined with an extensive product-related service offering. Scania offers vehicle financing, insurance and rental services to enable our customers to focus on their core business. Scania is also a leading provider of industrial and marine engines. In 2019, we delivered 91,700 trucks, 7,800 buses as well as 10,200 industrial and marine engines to our customers. Net sales totalled to over SEK 152 billion, of which about 20 percent were services-related. Founded in 1891, Scania now operates in more than 100 countries and employs some 51,000 people. Research and development are concentrated in Sweden, with branches in Brazil and India. Production takes place in Europe, Latin America and Asia, with regional production centers in Africa, Asia and Eurasia. Scania is part of TRATON SE.

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