硼粉粒度对Li-B合金结构及热稳定性的影响  

Effect of Boron Powder Size on Structure and Thermal Stability of Lithium-boron Alloy

作　　者：朱琳 卢丫 ZHULin;LU Ya(Guizhou Meiling Battery Co.,Ltd.,Zunyi 563000,China)

机构地区：[1]贵州梅岭电源有限公司,贵州遵义563000

出　　处：《有色金属材料与工程》2018年第4期21-24,共4页Nonferrous Metal Materials and Engineering

摘　　要：分别以3种粒度的硼粉为原料,采用相同的成分配比和工艺参数熔炼制备Li-B合金铸锭。合金铸锭经挤出和轧制获得薄带。随后进行X射线衍射(XRD)测试、扫描电子显微镜(SEM)观察、化学成分分析和热稳定性测试。XRD结果显示,Li-B合金由Li_7B_6相和锂相组成,且Li_7B_6相与锂相的衍射峰强度比随硼粉粒度的增大而减小。SEM观察表明,随原料硼粉粒度的增大,Li-B合金的纤维组织变得粗大且不均匀。化学成分测试显示,Li-B合金中化合态硼含量随硼粉粒度的增大而减小。热稳定性测试表明,原料硼粉的粒度越大,Li-B合金的热稳定性越差。The lithium-boron alloy ingots with the same composition were melted under the same process parameters by using three different sized boron powders.The thin-sheets were obtained by extruding and rolling the ingots.Then,they were investigated by XRD,SEM,chemical analysis and thermal stability test.XRD results show that the lithium-boron alloys are composed of Li7B6 phase and Li phase.XRD results show that the diffraction intensity ratio of Li7B6 phase to Li phase decreases with increase of boron powder size.SEM results show that the fibrous structure in lithiumboron alloy becomes coarse and nonuniform with increased boron powder size.Chemical composition tests show that the fraction of boron in compound is reduced with increase of boron powder size.Thermal stability test shows that the thermal stability of lithium-boron alloy decreases with the increase of boron powder size.

关 键 词：硼粉 LI-B合金 热稳定性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]