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Volume 18
Issue 21
10.3390/ma18214860
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Advanced Epoxy Resin/Boron Nitride Composites for High-Performance Electrotechnical Applications and Geological Instrumentation

by
Alina Ruxandra Caramitu
1,
Iustina Popescu
2,*,
Mihai Grigoroscuta
3,
Andrei Kuncser
3,
Paul Constantin Ganea
3,
Andrei Galatanu
3,
Magdalena Galatanu
3,
Gheorghe Aldica
3,
Petre Badica
3,
Mihail Burdusel
3,* and
Adriana Mariana Borș
4
1
National Institute for Research and Development in Electrical Engineering ICPE-CA, Splaiul Unirii Street 3131, District 3, 030138 Bucharest, Romania
2
Geological Institute of Romania-IGR, Caransebes Street 1, District 1, 012271 Bucharest, Romania
3
National Institute of Materials Physics, Atomistilor Street 405 A, 077125 Magurele, Romania
4
National Research and Development Institute for Optoelectronics INOE 2000, IHP, Cutitul de Argint Street 14, District 4, 040558 Bucharest, Romania
*
Authors to whom correspondence should be addressed.
Materials 2025, 18(21), 4860; https://doi.org/10.3390/ma18214860
Submission received: 30 July 2025 / Revised: 1 October 2025 / Accepted: 15 October 2025 / Published: 23 October 2025
(This article belongs to the Special Issue Piezoelectric, Ferroelectric, and Dielectric Materials: Properties and Related Applications)
Versions Notes

Abstract

Composites were obtained by using a commercial bicomponent epoxy resin (containing Al2O3 and SiO2) and cubic BN (cBN) (0–50 wt.%). Two preparation methods were used: (a) the cBN powder was first mixed with the resin base and further with the hardener, and (b) the cBN powder was first mixed with hardener and afterwards with the resin base. Both methods show a similar enhancement trend in the thermal conductivity from 0.77 W/mK in the resin without additive to 1 and 1.5 W/mK in the ones filled with 30 and 50 wt.% cBN, respectively. A reasonable decrease in bending strength from 74 for 0 wt.% cBN to 70 or 64 MPa for 30 wt.% cBN added by method (a) or (b), respectively, occurs. The bending strain at breakage decreased from 5.58% to 2.65 or 3.78%. High sensitivity vs. processing was also found for electrical properties measured for frequencies of 1–107 Hz. An increasing amount of cBN decreased the room temperature conductivity, dielectric constant, and dielectric loss tangent and modified the shape of the curves vs. frequency. However, in samples with 30 wt.% or more of cBN, a partial recovery to a high insulating state was observed.
Keywords: epoxy resin composites; boron nitride; thermal conductivity; dielectric properties; electrotechnical applications; geological equipment epoxy resin composites; boron nitride; thermal conductivity; dielectric properties; electrotechnical applications; geological equipment

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MDPI and ACS Style

Caramitu, A.R.; Popescu, I.; Grigoroscuta, M.; Kuncser, A.; Ganea, P.C.; Galatanu, A.; Galatanu, M.; Aldica, G.; Badica, P.; Burdusel, M.; et al. Advanced Epoxy Resin/Boron Nitride Composites for High-Performance Electrotechnical Applications and Geological Instrumentation. Materials 2025, 18, 4860. https://doi.org/10.3390/ma18214860

AMA Style

Caramitu AR, Popescu I, Grigoroscuta M, Kuncser A, Ganea PC, Galatanu A, Galatanu M, Aldica G, Badica P, Burdusel M, et al. Advanced Epoxy Resin/Boron Nitride Composites for High-Performance Electrotechnical Applications and Geological Instrumentation. Materials. 2025; 18(21):4860. https://doi.org/10.3390/ma18214860

Chicago/Turabian Style

Caramitu, Alina Ruxandra, Iustina Popescu, Mihai Grigoroscuta, Andrei Kuncser, Paul Constantin Ganea, Andrei Galatanu, Magdalena Galatanu, Gheorghe Aldica, Petre Badica, Mihail Burdusel, and et al. 2025. "Advanced Epoxy Resin/Boron Nitride Composites for High-Performance Electrotechnical Applications and Geological Instrumentation" Materials 18, no. 21: 4860. https://doi.org/10.3390/ma18214860

APA Style

Caramitu, A. R., Popescu, I., Grigoroscuta, M., Kuncser, A., Ganea, P. C., Galatanu, A., Galatanu, M., Aldica, G., Badica, P., Burdusel, M., & Borș, A. M. (2025). Advanced Epoxy Resin/Boron Nitride Composites for High-Performance Electrotechnical Applications and Geological Instrumentation. Materials, 18(21), 4860. https://doi.org/10.3390/ma18214860

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