%0 Journal Article
%T Effect of B2O3/TiO2 Mole Ratios in Al-TiO2-B2O3 Reaction System on the Wear Resistance of in-situ Exothermic-Dispersion Reaction Synthetic Al-Based Composites<br>Al-TiO2-B2O3反应体系中B2O3/TiO2摩尔比对热扩散反应合成铝基复合材料磨损性能的影响
%A ZHU He-guo~
%A WANG Heng-zhi~
%A XIONG Dang-sheng~
%A WU Shen-qing~
%A <br>朱和国
%A 王恒志
%A 熊党生
%A 吴申庆
%J 摩擦学学报
%D 2005
%I 
%X A series of Al-based composites were fabricated from the Al-TiO_2-B_2O_3 reaction systems of different B_2O_3/TiO_2 mole ratios, using exothermic dispersion in-situ synthesis. A pin-on-disc test rig was performed to evaluate the wear resistance of the resulting Al-based composites sliding against AISI52100 steel unlubricated condition at ambient temperature. An optical microscope and a scanning electron microscope were used to observe the microstructure of the Al-based composites and the morphologies of the worn surfaces and worn cross-sections. The results indicated that the wear mass loss of the Al-based composites increased almost linearly with increasing sliding distance. It increased with increasing sliding velocity until coming to the maximum at a velocity of 0.9 m/s, then it slightly decreased with further increase of the sliding velocity. The incorporation of B_2O_3 in the reaction system helped to improve the wear resistance of the Al-based composites, thus the wear resistance of the composites increased with increasing B_2O_3/TiO_2 mole ratio in the reaction system. The reinforcements were composed of Al_2O_3 particulates and rod-like Al_3Ti in the absence of B_2O_3 in the reaction system, in this case the corresponding composite had poor wear resistance, because of the severe ploughing action of the wear debris detached from the Al_3Ti rods. With increasing B_2O_3/TiO_2 mole ratios in the reaction system, the amount of Al_3Ti rods decreased, which was beneficial to decrease the grain size of the matrix grains finer, therefore the strength and plasticity of the composites were greatly increased. Moreover, the Al-based composites made from the Al-TiO_2-B_2O_3 reaction systems of different B_2O_3/TiO_2 mole ratios had differences in terms of the wear mechanisms as well. Namely, the Al-based composite made in the absence of B_2O_3 was dominated by abrasive wear and slight adhesion wear, while that made at a B_2O_3/TiO_2 mole ratio of 1.0 was dominated by adhesion wear and slight abrasive wear.
%K exothermic dispersion reaction
%K aluminum matrix composites
%K wear behavior
%K wear mechanism<br>热扩散反应合成
%K 铝基复合材料
%K 磨损性能
%K 磨损机理
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=5D344E2AD54D14F8&jid=2F467A5C6371C830162AAA01D7DAD07A&aid=4B8D2405F9686EB8&yid=2DD7160C83D0ACED&vid=C5154311167311FE&iid=CA4FD0336C81A37A&sid=EA389574707BDED3&eid=D3E34374A0D77D7F&journal_id=1004-0595&journal_name=摩擦学学报&referenced_num=0&reference_num=16