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Research on Iron Matrix Composites Reinforced by In-situ Al2O3 Particles

Author: ZhouYuCheng
Tutor: WeiShiZhong
School: Henan University of Science and Technology
Course: Materials Processing Engineering
Keywords: Bit authigenic Particle reinforced Alumina Composites Sintering
CLC: TB331
Type: Master's thesis
Year: 2011
Downloads: 35
Quote: 1
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Abstract


Al 2 O 3 particles reinforced copper, aluminum, magnesium-and zinc-based composite materials has made great progress in recent years, the Al 2 O 3 particle reinforced iron matrix composites is the relatively slow progress. Improve Al 2 O 3 particles with iron substrate wettability is the focus of the study. Homemade aluminum hydroxide as precursors to add iron situ research to develop an Al 2 O 3 particles reinforced iron matrix composites. Ethanol has a much smaller surface tension than water, the agglomeration force of the particles can be effectively reduced, to prevent drying of the aluminum hydroxide agglomerate. Using ethanol as the reaction medium of aluminum nitrate dissolved in anhydrous ethanol to form a solution, and then slowly added dropwise to aqueous ammonia and a white precipitate was washed, filtered, ultrafine aluminum hydroxide powder after drying at 1200 ℃ 3 hours and calcined converted into α-Al 2 O 3 crystals. And then compared to the method of ethanol was washed repeatedly with water as the reaction medium, to achieve the same effect can save a large amount of ethanol. Fully mixed of ultra-fine aluminum hydroxide powder with iron powder obtained by a certain percentage, suppress sintering prepared alumina particles reinforced iron matrix composites. This study the influence of the carbon content of the sintered body tissue, the results showed that: when the carbon content is about 1.2%, the sintered body is not found in Al 2 O 3 particles exist , but the aluminum hydroxide and iron in the high temperature reaction of hercynite hercynite artificial synthesis of a new high performance refractories, this experiment provides for synthetic hercynite a new approach. When the carbon content is increased to about 4%, a reducing atmosphere to enhance the hercynite disappeared in the sintered body, after the dewatering of aluminum hydroxide to generate the α-Al 2 O 3 particles. When Al 2 O 3 particle volume fraction of 10%, you can see a lot of Al 2 O 3 The particle distribution in the iron matrix, and when the volume fraction was 20%, only see Al 2 O 3 after the shedding of particles left a large number of pits in the iron matrix . In addition, in order to compare the situ prepared by direct add a containing Al 2 O 3 10% of the particles sample, the results show that the in situ The alumina generated autogenetic is better than the added directly alumina matrix combination. Finally, we also studied the sintering temperature the Al 2 O 3 particles reinforced iron matrix composite organization and performance, with the reduction of the sintering temperature, Al 2 O 3 particles and matrix combination better. When the sintering temperature is 1050 ° C, the matrix organization insufficient sintering, the hardness of the sample is low, the abrasion resistance is also the worst. When the sintering temperature is 1100-1150 ° C, the sample has a higher hardness, the best wear resistance, because Al 2 O 3 combination of particles and the substrate is preferably, can more effectively resist the cutting alumina sandpaper and scratches, when the sintering temperature exceeds 1200 ° C, while the high hardness, Al, 2 O 3 particles with iron matrix binding. poor wear prone to shedding, wear resistance anti declined. Therefore, in the present experimental conditions, the optimum sintering temperature of 1100-1150 ° C.

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