Abstract: Metal aluminum powder and nano-Al2O3 powder were added to the basic vitrified bond. The glass structure was analyzed by infrared spectroscopy, the phase change was characterized by X-ray diffraction, and the refractoriness of vitrified bond was tested. The microstructure of vitrified bond CBN composite was analyzed by scanning electron microscope, and the bending strength of composite was tested. The effects of single doping and compound doping with metal aluminum powder and nano-Al2O3 powder on the performance of vitrified bond were systematically analyzed. The results show that the refractoriness of vitrified bond increases by adding metal aluminum powder, and the glass structure dose not change significantly. After sintering, part of the metal aluminum powder is transformed into Al2O3 , and the bending strength of vitrified bond CBN composite increases with the increase of sintering temperature. The refractoriness of vitrified bond is reduced by adding nano-Al2O3 powder, and the vitrified bond is in glass phase, but a small amount of Al2SiO5 and LixAlxSi3-xO6 crystals are precipitated, and a higher bending strength of 93. 7 MPa of vitrified bond CBN composite is obtained sintering at 720 ℃ . Compound doping of metal aluminum powder and nano-Al2O3 powder is beneficial to bonding of glass network structure. The vitrified bond is mainly glass phase, but a small amount of crystals are precipitated. Compound doping is more beneficial to increase bending strength of vitrified bond CBN composite, but the sintering temperature also increases accordingly. The highest bending strength of the composite sintered at 740 ℃ is 97. 4 MPa.
Key words: aluminum powder; nano-Al2O3 powder; vitrified bond; CBN; microstructure; property
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