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MM: Fachverband Metall- und Materialphysik

MM 63: Functional Materials: Performance, Reliability and Degradation

MM 63.4: Talk

Thursday, March 21, 2024, 16:15–16:30, C 230

Thermomechanical properties of diamond abrasive grains — •Gabriel Brune1, Tountzer Dereli2, Lars Olschewski1, Monika Kipp2, Dirk Biermann2, and Jörg Debus11Department of Physics, TU Dortmund — 2Institute of Machining Technology, TU Dortmund

Abrasive grains are subjected to high thermomechanical stress during high-speed precision grinding. While cubic boron nitride is often used for its high hardness and thermal resistance, diamond - with its superior hardness - provides better grinding results. However, when machining steel at temperatures of about 600C, graphitization of the diamond surface is a major issue lowering the structural and chemical stability.

These structural and chemical changes including the influence of O2 and interfaces between sp2 and sp3 hybridized areas within the carbon network are in the focus of our studies. Accordingly, a series of diamond abrasive grains exposed to differently high thermomechanical loads was analyzed. Spatially resolved Raman spectroscopy of the diamond surface reveals the structural properties of the grains. Based on shifts of the diamond Raman peak at 1332 cm−1, tensile and compressive strain up to 200 MPa is determined. In particular, the observation of the D peak (around 1350 cm−1) and G peak (around 1550 cm−1) indicates the local formation of amorphous carbon clusters. From the peak shapes it is possible to estimate local maximum surface temperatures (= 660C) [APL Mater. 11, 031106 (2023)] that occured during the grinding process.

Keywords: Diamond; Raman Spectroscopy; Graphitisation; Abrasive Grains

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