碱洗处理对B_4C粉末在Mg-Li基体中分散效果的影响  

Effect of alkaline solution treatment of B_4C powder on the dispersion in the Mg-Li matrix

作　　者：任国安[1] 刘志坚[1] 杨晓亮[1] 黄海锋[1] 文佑才[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《复合材料学报》2011年第6期148-152,共5页Acta Materiae Compositae Sinica

摘　　要：通过碱液清洗粉末净化B4C颗粒,以改善其在Mg-Li基体中的分散特性。结果表明:经过预处理后粉末中超细颗粒明显减少,B2O3含量减少,B4C粉末颗粒表面更加洁净。采用经碱洗处理后的B4C粉末制备出的高锂低熔点预混合金拉伸强度与密度均有提高。最后按Mg-15Li-2Al-6B4C成分配比制备的B4C/Mg-Li复合材料金相组织中B4C粉末聚团明显减少,组织更加均匀,与用未处理B4C粉末制备的B4C/Mg-Li复合材料相比,其拉伸强度提高21.53%。对B4C粉末的碱洗预处理有效地提高了原位生成硼化物对B4C/Mg-Li复合材料的强化效果。Alkaline solution treatment was used to purify B4C powder and enhance the wetting ability between the B4 C powder and the Mg - Li matrix. The results show that both of the specific surface and B2O3 decrease. Tensile strength and density of the pre-mixed alloy prepared by the B4C powder after alkaline treatment increase. Fewer agglomerates and uniform formation are proved in the metallographic structure of the B4 C/Mg- Li composite （Mg- 15Li- 2A1- 6B4 C）. The tensile strength of B4C/Mg- Li composite increases 21.53% compared with that prepared by B4 C without alkaline solution treatment. Results indicate that the alkaline solution treatment of B4 C powder can improve the strengthening effect of the boride in situ reacted in the B4C/Mg- Li composite.

关 键 词：碱洗 碳化硼 预混合金 Mg—Li 拉伸性能 

分 类 号：TB332[一般工业技术—材料科学与工程]