Friction and wear behaviors of aluminium matrix composites reinforced with in-situ formed TiB2particles were measured by MMW-1 friction testing machine under the different loads and rotation speeds. SEM, heating microscope and XRD were utilized to research the friction and wear behaviors. The results showed that the friction and wear property was improved by addition of TiB2particles.
The thermal conductivity mechanism of aluminum alloy is introduced briefly. And the factors influencing the thermal conductivity of aluminum alloy is summarized. The measures such as controlling composition, adding rare earth, technology for heating processing to improve the thermal conductivity of the aluminum alloy are analyzed. Research status of the thermal conductivity mechanism of aluminum alloy in domestic and overseas are summarized. The developing situation and future development prospects were given as well.
Al-Ti-B master alloy is the most widely used grain refiner in the aluminum fabrication industry, while it’s refinement mechanism is not clearly understand yet. The TiB2 in Al-Ti-B master alloy is one of important phase to grain refining, which intimately related to the generation of initial nucleus, the “fading” phenomenon of refining effect declines with the increase of holding or standing time in grain refining process. Besides, TiB2 is analyzed in several studies about the “poisoning” phenomenon, a large extent weaken of refining effect when Zr, Cr, Mn etc. exists. In this article, the impact of TiB2 to the refining effect of Al-Ti-B master alloy is discussed aiming at the roles and phenomenon mentions above.
The reason of comprehensive utilization of red mud is that it contains recycled oxides and a variety of valuable metals. In this paper, the basic characterization of red mud is described. The current developments of extraction of Fe, Ti, Sc, rare earth and valuable metals from red mud are summarized with some emphasis. In addition, the technological features of each process route are analyzed briefly. It can be concluded that it is practiable to extract Fe, Ti, Sc, rare earth and valuable metals from red mud. However, in order to realize recycling of red mud, the key is that an economic, energy saving, environment friendly and widely applicable process has to be found.
Three inclusion detection methods: image analysis, colorimetry and flux rinsing were compared aiming at the removal of solid oxide inclusions in molen aluminum in this paper. The testing results obtained from the comparative experiments indicate that the content of inclusions in aluminum can be detected quantitatively and quickly using the three methods. Image analysis is more intuitionistic, but testing value is a little larger; colorimetriy and flux rinsing method are of high accuracy, but testing values are estimated to be a little lower.
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