摘要:
采用维氏压痕法对钒钛烧结矿与普通烧结矿中常见矿物的显微硬度进行测定, 对比分析不同矿物的显微硬度值及压痕裂纹的萌生与扩展。研究发现, 两种烧结矿中常见矿物的显微硬度从高到低依次为:钙钛矿-钛赤铁矿-铁酸钙-交织熔蚀结构-钛磁铁矿-硅酸盐;赤铁矿-交织熔蚀结构-铁酸钙-磁铁矿-硅酸盐。总体上钒钛烧结矿的显微硬度高于普通烧结矿, 但部分矿物压痕裂纹多, 且延伸较长, 钙钛矿和钛赤铁矿断裂韧性差、易碎。烧结矿中减少板块状赤铁矿, 多发展铁酸钙和交织熔蚀结构有利于提高烧结矿的显微硬度, 改善烧结矿的质量。
Abstract:
In this paper Vivtorinox indentation had been used to detect micro-hardness of the common minerals in vanadium-titanium sinter and ordinary sinter,and the micro hardness of different minerals had been compared as well as indentation crack initiation and propagation had been analyzed. Micro-hardness measurement shows that the common minerals in two kinds of sinter with their hardness at descent order are: perovskite,titanium hematite,calcium ferrite,mixed corrosion structure,titanium magnetite,silicate;hematite,mixed corrosion structure,calcium ferrite,magnetite,silicate.Above all,the micro hardness of vanadium-titanium sinter is higher than that of ordinary sinter,but some mineral in vanadium-titanium sinter appears many indentation cracks and longer propagation.The fracture toughness of perovskite and titanium hematite is lower,and readily for cracking. For sinter ore,the micro hardness can be increased and the quality of sintered ore can been improved by reducing the plate hematite and developing the calcium ferrite and the mixed corrosion structure.
点击查看大图
下载:
