Abstract
Operating diamond grits to produce a precise grind tool is need. In order to lift up a diamond grit by magnetic force, the magnetic flux was estimated to be 100 μT/g. Diamond (110) surface was modified with manganese powder at 450°C (720 K) then with bismuth powder at 270°C (540 K) due to its low melting temperature. Manganese carbides were formed on the diamond surface which was confirmed by an X-ray diffraction. A magnet that exhibits ferrimagnetism was formed on the surface, it had a spontaneous magnetism. We conducted to form six small disk magnets at hexagonal apex positions on the diamond (110) by using gold film mask. The magnetic flux measured at the center of the hexagon magnets on was 232 μT at room temperature, and the surface modified diamond grid could be lifted up in the magnetic field between two solenoid coils.
Highlights
As known anti ferrous magnetism of MnO, manganese compounds exhibit various magnetic properties
We propose thin MnBi magnets on lamellar manganese carbide modified the (110) surface of the diamond using infrared ray heating
In the manganese carbide formation process, manganese powder did not react with diamond in the MnBi formation process, the remained manganese reacted with the bismuth to provide the ferro-magnetism
Summary
As known anti ferrous magnetism of MnO, manganese compounds exhibit various magnetic properties. The manganese compounds of MnAs and MnBi are known as ferrimagnetism materials [1]. P. Karen et al [2] reported the manganese carbide Mn7C3 and Mn5C2 microstructure and paramagnetic property. Manganese and carbon react to be formed carbide . A mixture of a fine diamond powder and manganese powder reacted not to remain the diamond powder. Infrared ray heating has less damage to diamond due to the transparency into diamond. The three surfaces of (111), (100) and (110) of diamond were attempted to be surface modification
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