【摘要】 本文通过电子探针微区分析(EPMA)研究了黏土-长石-硼玻璃系烧熔结合剂刚玉陶瓷磨具的显微结构,分析了磨料中的杂质特征,并对磨料与结合剂之间的反应特点进行了研究。研究表明:烧熔结合剂呈基本均匀的玻璃状态,结合剂与磨料在界面上结合紧密。棕刚玉磨料中的杂质有TiO2、ZrO2、Fe2O3、MgO、Na2O、K2O等,并以TiO2为主。白刚玉磨料中的杂质为板条状的含钾的β-氧化铝。结合剂与磨料之间反应明显,刚玉磨料的边缘在结合剂作用下被熔蚀,棕刚玉形成锯齿状,白刚玉形成港湾状。棕刚玉中的含钛物质随着磨粒表面被熔蚀而进入结合剂中,在磨料与结合剂的界面及结合剂内形成金红石微晶。更多还原

【Abstract】 Microstructures of molten vitrified bond have an important effect on the behaviour of the corundum grinding wheel.The authors studied the microstructures of the molten vitrified bond corundum grinding wheel,as well as the impurities in the abrasive grains.The reaction characteristics between the abrasive grains and the bond was revealed by electronic probe micro area analysis(EPMA).The results showed that the molten bond was in a glassy state,the bond-bridge and the abrasive grains were bonded well.The impurities in the titanium-doped corundum grains were TiO2,ZrO2,Fe2O3,MgO,Na2O,K2O and the TiO2 was the main one.The impurity in the white fused corundum grains was β-Al2O3 rich in potassium.The reaction between the abrasive grains and the bond was obvious,the edge of the corundum grains was ablated by the bond at high temperature.The titanium-doped corundum grains showed a jagged edge and the white fused corundum grains showed a harbour-like edge after ablation.The dissolution of corundum allowed the precipitation of TiO2 into the glass bond in the form of rutile needles.更多还原