摘要:Strontium is so far as known a semi-per-manent modifier for aluminium-silicon alloy, however the fading of Sr-modified Al-Si alloy was studied in laberatory and under industrial conditions.It has been found that the strontium fades considerably more quickly than expected in general. The lifetime of Sr-modified Al-Si alloy is about 60 ̄90 min, depending on the initial content of strontium in melt and the melt circumstances. The turbulence of melt and bubbling during degassing will make the strontium easily to faed, It appears that the strontium loss from the melt are primarily by oxidation that makes the Sr-content lowering dowm to a critical value 0.003% ̄0.004%.The reason of such a qiuck fading would remain to be solved.
摘要:The modificatim effect of strontium-.Sodium,titanium and boron-Containing Composite modifier on Al-Si-Cu alloy has been researched. Comparing with the Strontium-only Containing modifier,the composite modifier is more effective on grain refining of etectic structure,and the effectiveness is more prolongable.
摘要:The influence of antimony,zinc,and manganese on the structure and property of antimony bronze is studied. Doing a lot of experiments,we have developed a new antimony bronze which possesses better property than tin bronze and hence is an exellent substitute.
摘要:Furan resin bonded sand is poor in collapsibility when it is used for non-ferrous metal casting, especially for thin section castings and heavy walled cores.To solve this problem, a series of experiments in reducing the retained strength while remaining the hot strength in different temperatures for KJN-Ⅲ furan resin-bonded sand sample using a different amount of additives have been carried out. The results show that the retained strength can be reduced by 40% ̄80% when a certain amount of additives is used.