Na_(2)O/(2B_(2)O_(3)·Al_(2)O_(3))摩尔比对陶瓷结合剂金刚石磨具性能的影响

Effect of Na_(2)O/(2B_(2)O_(3)·Al_(2)O_(3)) Molar Ratio on the Performance of Ceramic Bond Diamond Abrasive Tools

通过调整陶瓷结合剂中n(Na_(2)O)/n(2B_(2)O_(3)·Al_(2)O_(3)),来探究n(Na_(2)O)/n(2B_(2)O_(3)·Al_(2)O_(3))对陶瓷结合剂金刚石磨具性能的影响。当n(Na_(2)O)/n(2B_(2)O_(3)·Al_(2)O_(3))=1.2时,磨具试样的强度(69MPa)和硬度(121HRB)达到最大值。随着碱金属氧化物Na_(2)O添加量的增加,结合剂的耐火度随之显著降低,流动性和热膨胀系数增加。磨具试样断口SEM照片表明,适量的碱金属氧化物Na_(2)O能够使磨具断面空隙减少,孔隙度降低,结合剂与磨料分布更加均匀,结合剂与磨料结合界面更加紧密。当n(Na_(2)O)/n(2B_(2)O_(3)·Al_(2)O_(3))=1.1时,磨具试样的磨耗比达到最大值120。

By adjusting the n(Na_(2)O)/n(2B_(2)O_(3)·Al_(2)O_(3))in the ceramic bond,the influence of n(Na_(2)O)/n(2B_(2)O_(3)˙Al_(2)O_(3))on the performance of the ceramic bond diamond abrasive tool is explored.When n(Na_(2)O)/n(2B_(2)O_(3)·Al_(2)O_(3))=1.2,the strength(69MPa)and hardness(121HRB)of the abrasive sample reaches the maximum.With the increase of the alkali metal oxide Na_(2)O addition,the refractoriness of the binder decreases significantly,and the fluidity increases significantly.The SEM photo of the fracture surface of the abrasive tool sample shows that a proper amount of alkali metal oxide Na_(2)O can reduce the voids and porosity of the abrasive tool section,the distribution of bonding agent and abrasive material is more uniform,and the combining interface between bonding agent and abrasive material is closer.When n(Na_(2)O)/n(2B_(2)O_(3)·Al_(2)O_(3))=1.1,the wear ratio of the abrasive sample reaches the maximum value of 120.