Preparation And Characterization Of Low Temperature Cermet Binder For CBN Grinding Tool

The paper mainly discusses the cBN abrasive preparation and characterization in low temperature metal /ceramic, which add pre-alloyed iron-based metal powder to the Na2O-B2O3-A12O3-SiO2 system that based vitrified. Using the high-energy ball milling method to prepare low-temperature metal/ceramic composite binder. The test methods include a three-point bending strength test, a lzod impact strength testing machine,thermal expansion coefficient tester, a scanning election microscope( abbreviated SEM), and X-ray diffraction(referred to XRD)?This method is more systematic study of the metal-ceramic composite binder pre-alloyed iron-based powder's,the performance change which characterized by bending strength, impact strength, thermal expansion coefficient and microstructure organization, also studied the process parameters and the grinding knot ration of iron-based metal/ceramic on the ferrous metal/ceramic bond's structure and properties.The results showed that: ?Cu amount of 26wt%, Co is added at an amount of 17wt%,the low temperature metal / ceramic binder flexural strength and impact strength reaches the maximum value, respectively, 91.34 MPa and 4.33KJ/m2, with respect to pure ceramics, the propertries were increased by 210% and 70%, the toughness has been greatly improved; ?when Cu added at 16wt%, Co is added an amount of 17wt%, the linear expansion coefficient of the metal / ceramic composite binder reachs small,that was 9.2 × 10-6/?; ? when the Cu addition is 26wt%, Co is added an amount of 17wt%, the thermal expansion coefficient of the binder was 9.99 × 10-6/?; ? when the Cu addition amount of 26wt%, Co is added an amount of 17wt%, adjust the process parameters of the binding agent, the optimum parameters were as follows: sintering temperature of 700 ?, pressing pressure 3MPa, dwell time of 2.5minutes. ? relatively pure thermal conductivity ceramics, and different contents of Cu metal /ceramic bond, obtained when the Cu addition is 26wt%, the thermal conductivity of the metal/ ceramic composite binder with respect to the pure ceramic increased by 90%. ? added abrasive metal / ceramic composite binder to prepare a metal / ceramic composite bonded abrasives, when the abrasive is 100 parts, binding agent comprises abrasive percentage of 30,the sintering temperature of 825 ?, holding time of 6min, measured too abrasive impactstrength and flexural strength of the sample of the largest, and a maximum of 106.7MPa3.23 KJ / m2. ? When the abrasive is 100 parts, binding agent comprises abrasive percentage25,30,32.5,35,40,45, when the percentage of binding agent comprises abrasive, the higher the intensity, the percentage was 45 when accounting for the abrasive, the strength of 110 MPa and 3.82KJ/m2.