Research On The Holding Strength Of Bond To Diamond Grain In Vitrified Abrasives

The strength that prevents the diamond grains falling off from the bonding in diamondtools called holding strength, which consist of physical adhesive force, mechanicalembedding force and chemical bonding force. Whether or there are the appropriate holdingstrength of bond to diamond grain in diamond tools is an essential issue that is to determine ofquality diamond tools. Therefore it is very important that research holding strength of bond todiamond grain.At present, devoted to the diamond and vitrified bond holding strength of bonding hasnot been reported. Since the distribution of diamond grain in the tool, any direct way ofholding force can not effectively detect. The determination method of holding strength ofbond to the surface of diamond grain per unit area is not a public solution.This issue contains a ceramic phase from the low melting point of high strength andhardness of the vitrified bond for the research and preparation of starting. By exploring theimpact factors of vitrified abrasives to damond grain’s holding strength and diamond andvitrified bond material characterization and analysis of the interface and the holding strengthtest method of the vitrified bond todiamond grain, for holding strength of vitrified bond todiamond grain conducted in-depth research.The results are as follows:First, the laboratory developed MgO-Al₂O₃-SiO₂system glass vitrified bond has a lowerrefractoriness, the right liquidity, low expansion coefficient and higher strength.Second, by the oxide addition of bond, forming density, particle size of diamondabrasive and the concentration of diamond abrasive vitrified bond four factors on the strengthof experimental analysis of diamond samples. The highest bending strength obtainedexperimental program: A₁B₃C₃D₃. The sintering temperature was controlled at between790℃to800℃, forming a density2.25g/cm3,125%diamond concentration to do CeO₂additives, particle size diamond80/100.Third, Discusses two kinds of improving methods of control force，Namely improvecombination agent of hardness and diamond surface coating alumina. Fourth，the study of the diamond tool holding strength of the test method. Attempts tocontrol diamond tools can not directly measure the holding strength of the plight of solutions.Proposed holding strength test method based on testing the tensile strength. Diamond grain bymechanical analysis and idealized assumptions, the establishment of holding force mechanicalmodel calculations. Holding strength obtained by mathematical analysis of the relationshipbetween tensile strength and abrasive mathematical model.For holding force to achieve aquantitative test.