Effects of nano aluminum nitride on the microstructure and mechanical properties of vitrified bond diamond tools
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This study investigated the effects of nano aluminum nitride (AlN) on the microstructure and mechanical properties of vitrifiedbond diamond tools. Raman spectra analysis indicated that added nano AlN helped to protect the diamond crystal structureduring sintering. The diffraction peaks of diamond, AlN, Al2O3, and a few of SiO2 crystal were observed in the X-raydiffraction analysis. However, a lower sintering temperature of 690 oC in this study decreased the formation of Al2O3 and α-SiO2 phases. Scanning electron microscope images showed that addition of 10 vol% nano AlN into the specimen provided anappropriate wetting and bonding between the diamond grits and the matrix, thus producing the highest grinding ratio (24.1)of the tools and the best workpiece surface roughness. The added amount of nano AlN higher than 20 vol% would trigger gaseruption from the matrix during the sintering process, which produced a larger number of pores and caused the vitrifiedmatrix expansion. The deteriorated microstructure decreased the mechanical properties of vitrified bond diamond tools.
Abstract
This study investigated the effects of nano aluminum nitride (AlN) on the microstructure and mechanical properties of vitrifiedbond diamond tools. Raman spectra analysis indicated that added nano AlN helped to protect the diamond crystal structureduring sintering. The diffraction peaks of diamond, AlN, Al2O3, and a few of SiO2 crystal were observed in the X-raydiffraction analysis. However, a lower sintering temperature of 690 oC in this study decreased the formation of Al2O3 and α-SiO2 phases. Scanning electron microscope images showed that addition of 10 vol% nano AlN into the specimen provided anappropriate wetting and bonding between the diamond grits and the matrix, thus producing the highest grinding ratio (24.1)of the tools and the best workpiece surface roughness. The added amount of nano AlN higher than 20 vol% would trigger gaseruption from the matrix during the sintering process, which produced a larger number of pores and caused the vitrifiedmatrix expansion. The deteriorated microstructure decreased the mechanical properties of vitrified bond diamond tools.
참고문헌 (24)
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