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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。
Vickers indentation method was used to measure the microhardness of common minerals in vanadium-titanium sinter and common sinter. The micro-hardness values and initiation and propagation of indentation cracks of different minerals were analyzed. The results show that the microhardness of common minerals in two kinds of sinter are as follows: perovskite - titanium hematite - calcium ferrite - interlaced corrosion structure - titanomagnetite - silicate; hematite Ore - Interlacing corrosion structure - Calcium ferrite - Magnetite - Silicate. In general, the microhardness of vanadium-titanium sinter is higher than that of ordinary sinter, but some of the minerals have many indentation cracks and extend for a long time. The fracture toughness of perovskite and titanium hematite is poor and brittle. The reduction of slab hematite in sinter, the multi-development of calcium ferrite and the interlacing corrosion structure are beneficial to improve the microhardness of sinter and improve the quality of sinter.