Effect Of Copper-based Adhesive On Microstructure And Properties Of Iron-based Sintered Body For Diamond Saw Blade

Diamond saw blade is a common cutting tool applied widely in the stone processing industry.The diamond saw blade consists of a knife head and a steel matrix playing a supporting role.The iron-based knife head gets increasingly used because of its lower costs and better quality.In the actual service of the diamond saw blade,the falling of the diamond from the blade is the main failure form.Adhesive is an important part of the diamond saw blade,and its main role is to bond the diamonds and the matrix together,which is of great significance for preventing the falling of the diamonds.In this paper,the microstructures and properties of iron-based sintering matrix,with the copper-tin 15 adhesive commercially available and the copper-zinc-tin binder self-made respectively,were investigated by OM,SEM,EDS,XRD,density test,hardness test and bending strength test,in order to compare the effect of the binder amount addition and sintering temperature on the microstructures and properties of iron-based sintering matrix with the same methods.The results showed that with the increasing content of copper-tin 15 binder,the white Cu-rich phases rised,while the gray iron-rich phases reduced.And the compact density,hardness and bending strength all improved first and then minished with the addition of the copper-tin 15 binder.With the rising of sintering temperature,the compact density of iron-based sintered body increased while the hardness and bending strength raised first and then decreased subsequently.The iron-based sintered body containing copper-tin 15 binder got the best comprehensive properties when the content of copper-tin 15 binder was 25 wt.% and the sintering temperature was 820?.With the heightening of copper-zinc-tin binder content,the grain size of iron-based sintered body containing copper-zinc-tin binder decreased first and then increased.The grain size was the smallest when the content of copper-zinc-tin binder was 20wt%.With the content of copper-zinc-tin binder rising,the bending strength of iron-based matrix enlarged obviously first and declined next while the density and hardness largened first then begin to stabilize.With the rise of sintering temperature,the grain size of copper-zinc-tin binder iron-based were coarsened obviously,and the density as well as hardness increased slightly first and then tended to be steady,while the bending strength decreased continuously.The iron-based sintered body containing copper-zinc-tin binder got the best comprehensive properties when the content of copper-zinc-tin binder was 20 wt.% and the sintering temperature was 780?.Compared with the copper-tin 15 binder saled in the market,the self-made copper-zinc-tin adhesive got the best comprehensive performance at a less addition content and a lower sintering temperature.The diamond saw blades were produced at the best addition amount and sintering temperature of two kinds of Cu-based binder respectively.Afterwards the cutting experiments were conducted on the blade.The results of cutting experiments showed that the diamonds of the saw blade prepared with the copper-zinc-tin adhesive got a higher degree of exposure.The gap between the diamonds and iron matrix was smaller.The retension of the iron-based matrix containing self-made copper-zinc-tin binder to diamond particles was significantly higher than that of the copper-tin 15 commercial binder.