Preparation And Characterization Of Low Temperature Ceramic/Fe-based Bond

In this paper,the preparation and characterization of low temperature ceramic / Fe-based metal bond were studied.A low melting and brittle Na2O-B2O3-A12O3-SiO2 system of vitrified ceramic was adding to Fe-based bond.The new low-temperature ceramic/Fe based metal compound binder was prepared by mechanical milling.The test methods include microcomputer controlled electronic universal testing machine,pendulum impact strength tester,thermal expansion coefficient tester,X-ray diffraction(XRD),scanning electron microscope(SEM).These methods systematically studied the influence of process parameters and additives on low-temperature vitrified ceramic/Fe-based metal compound bond.The influence which characterized by bending strength,impact strength,micro-structure and properties;At the same time,the influence of process parameters on mechanical properties the micro-structure of low temperature ceramic/Fe-based metal bond abrasive samples were also explored.The results show that:(1)the vitrified with different volume fraction are added into the Fe-based metal bond,and the properties of the compound bond are determined.The content of vitrified(volume fraction)increased from 15% to 55%,the bending strength of the compound bond is reduced from 576 MPa to 187.76 MPa,the impact strength decreased from 17.86KJ/m2 to 5.13KJ/m2;the hardness showed an upward trend with the increase of the content of vitrified.(2)When the sintering temperature of 740?,the pressure of 3MPa,holding time of 2.5 minutes,the bending strength and impact strength of low temperature vitrified / Fe based metal bond reached 205 MPa and 6.4KJ/m2,and the Fe-base metal bond and the low temperature vitrified achieves the best mechanical fitting.When the sintering temperature increased from 720? to 740?,the size of NaAlSi2O6 crystal decreases from 36 nm to 26.2nm,the component of Co,Cu,Sn formed CoCu2 Sn alloy.(3)When the sintering temperature of 760?,pressure 3MPa,holding time of 2.5min,the content of Y2O3 is 0.8%,the bending strength and impact strength of the low temperature vitrified/Fe-based metal bond reached the maximum,316 MPa and 6.7KJ/m2 respectively,the density reached the maximum of 5.8kg/cm3;when the amount of Y2O3 increased,the interface of wettability between low temperature vitrified and Fe-based metal bond improved,adding a small amount of Y2O3 can promote the development of low temperature ceramic NaAlSi2O6 crystal precipitation,inhibition of NaAlSi2O6 crystallization is excessive,when the content of Y2O3 is 1.2% the crystallization of NaAlSi2O6 was promoted,the crystallization of Si O2 was restrained;when the content of CeO2 is 0.4%,the bending strength and impact strength of the low temperature vitrified/ Fe-based metal bond reached the maximum,420 MPa and 14.2KJ/m3 respectively,the density reached the maximum of 6.38kg/cm3;when the content of V2O5 is 0.6%,the bending strength and impact strength of the low temperature vitrified/Fe-based metal bond reached the maximum,412.5MPa and 10.6KJ/m2 respectively,when the content of V2O5 is 1% the density reached the maximum value of 5.8g/cm3.(4)When the sintering temperature of 760?,pressure 3MPa,and holding time of 2.5min process,the bending strength of the abrasive tool reaches the maximum value of 192.04 MPa,and the impact strength reaches the maximum value 8.56KJ/m2.