The Influence of Thermal Properties Anisotropy on Subtractive Laser Processing of B4C/h-BN Composites

Autor: Paweł Rutkowski, Karol Gala, Kamila Misiura, Jan Huebner
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Materials, Vol 13, Iss 22, p 5191 (2020)
Druh dokumentu: article
ISSN: 1996-1944
DOI: 10.3390/ma13225191
Popis: This work concerns boron carbide matrix composites with the addition of hexagonal boron nitride particles (h-BN) as a solid lubricate. The composite materials were hot-pressed and analysed in terms of phase, structure, and microstructure changes in relation to the h-BN content. The uniaxial pressure applied during the manufacturing process allowed the orientation of single h-BN particles and its agglomerates in perpendicular direction to the pressing axis. The anisotropy of heat transfer and thermal expansion coefficient (CTE) and density changes in relation to temperature are discussed. Thermal diffusivity and conductivity were measured in relation to the material direction by the laser flash analysis method (LFA). In this paper, understanding the heat flow and CTE changes allowed explaining the results of investigated subtractive laser processes of the manufactured composites. The laser ablation process was conducted on B4C/h-BN composites in parallel and perpendicular direction to each other. It was done in a continuous work (CW) mode at 50 W with a 40 µm spot and 3 mm/s beam travel speed. The influence of h-BN particles and their orientation on thermal properties is discussed. The effect of laser processing on B4C/h-BN composites was also discussed in relation to the material surface roughness measured with a confocal microscope, microstructure observations, density, and thermal properties changes in relation to the material direction.
Databáze: Directory of Open Access Journals
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