Preparation And Research On Structure And Properties Of Vitrified Bond For Diamond Grinding Wheel

Vitrified bond diamond grinding wheels with outstanding properties (such as highprocessing efficiency, high machining precision, high strength, good shape retentionand dressing, etc.) are widely used for grinding and machining materials such as PCD,super alloy, advanced ceramic, gem, crystal, rare earth materials and other super hardmaterials. The vitrified bond which is better than resin bond on strength performanceand metal bond on porosity and self-sharpening performance has higher elasticitymodulus and lower fracture toughness. At present the application of vitrified bonddiamond grinding wheels are getting more extensive. Therefore, it has a great marketvalue to research on promoting the properties of the vitrified bond.According to the performance requirement of vitrified bond for grinding wheels,this paper designed SiO2–B2O3–Al2O3–CaO system vitrified bond. This paperprepared the vitrified bonds by using scientific and mature technique. The structuresof the vitrified bonds were characterized by means of XRD and FTIR. Besides, thethermal expansion coefficients, bending strength, hardness and other properties of thevitrified bonds were tested and analyzed. Meanwhile, the microstructures of thevitrified bond sinters and the property of the vitrified bond wetting diamond werecharacterized by using FSEM.Firstly, the influence of the relative contents of SiO2and B2O3on the structuresand properties of the vitrified bonds was studied in this paper. Then the4#vitrifiedbond with best comprehensive performance was selected as a basic vitrified bond.Finally, the effect of the WO3and the aluminum powder on the structures andproperties of basic vitrified bond was researched respectively.The results in this study work indicated that SiO2–B2O3–Al2O3–CaO systemvitrified bond had low sintering temperatures (below720℃),high bending strength(more than100MPa), low thermal expansion coefficients and good wetting todiamond abrasive grains. Moreover, the moderate content of the WO3and thealuminum powder adding was benefit for improving the properties of theSiO2–B2O3–Al2O3–CaO system vitrified bond.