Study On Mn-Al Intermediate Alloy

In modern industry, manganese has been become more and more important. In steel production, it can be applied to deoxidization, desulfruation, alloying and etc. In alloying technology, it can be applied to refining crystal grain and improvement the hardness, malleability, resistance to abrasion and corrosion resistance. Another name of aluminous is universal metal. The most important characteristics are light and good corrosion protection. In steel production, aluminous is used for deoxidizing agent, conditioning agent, alloying agent and so on. In production of alloys, the manganese and aluminous should be put in at the same time, but the melting point and density of manganese is more larger than aluminous, this will create componential segregation. At the present time, a great many of research have been accomplishment on Mn-Al binary alloys, but those alloys contain manganese are only 1-1.6% or 10%. This article will use smelting method and powder metallurgic method to produce MnAl25 and MnAl15 intermediate alloy.For smelting method, we discussed the effect of the charging sequence, refining agent, mold, secondary factors and performance of alloy. The experimental results showed that: (1) With the thickness of casting increasing, the componential segregation will become more larger. (2) Use copper mold is propitious to obtain constituent homogeneous alloy. (3) Charging sequence will influence the yield of alloy. (4) The variety and use level will influence the yield of alloy. (5) Put some covering material attached to the surface of mold will improve the performance of alloy.For powder metallurgic method to produce MnAl25 intermediate alloy, we discussed the effect of the compressive stress, plastering agent, anti-friction material and the efflorescence rate, density of alloy. The experimental results showed that: (1) the most important influencing factors are compressive stress and plastering agent. (2) With the increasing of plastering agent, the density of alloy becomes larger, but when the percentage composition of plastering agent is 0.6%, the density become maximizing. (3) With the increasing of compressive stress, the density become larger and the efflorescence rate become lower. (4) The componential segregation is very small. (5) The best process conditions are: the pressing pressure is 650Mpa; the use level of binding admixture is 0.6%. (6) The alloys that obtained by the best process can reach the following point: the efflorescence rate is 0.01%,the density is 4.41 g/cm3.