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UTILITY TEST ON PROLONGING LIFE TIME OF HYDRIDE BATTERY WITH NANO-CRYSTALLIZED RARE-EARTH JYDROGEN ABSORBING ALLOYS

纳米晶稀土吸氢合金延长氢化物电池寿命的实用试验

基本信息

批准号：
07555209
负责人：
OKADA Masuo
金额：
$ 8.19万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555209/
关键词：
HYDROGEN ABLORBING ALLOYS AMORPHOUS PHASE La-Ni-B ALLOYS SYSTEM MELT-QUENCHING LaNi5 PHASE FINE GRAIN SEIZE Ni-HYDRIDES BATTERIES PREVENTION ON PULVERIZING OF ALLOYS 微粒化抑制アモルファス相

项目摘要

The purpose of the present studies is to obtain amorphous or nano-crystallized LaNi_5 phases for prolonging the life time of presently used Ni-hydrides batteries.(1) Development alloys with microstructures consisted of LaNi_5 phases embedded in amorphous phases :The present study successfully prepares the amorphous phase in large compositional range of La-Ni-B systems by melt-spinning. The temperature that LaNi_5 phase is formed is about 500ﾟC in the composition of (LaNi_5)_<0.8-0.7> (LaNi_<12>B_6)_<0.2-0.3>. The PCT measurements reveal that the amount of absorbed hydorgen in amorphous phase is small, that of crystallized alloys after heat-treatment increases and is around 0.9mass%.(2) Amorphous-formation on La-Ni-B alloys with low B content and its hydrogen absorbing properties :The formation of amorphous phase in the alloys with low B content is studied for the compositional alloys of LaNi_3B_<0.5>M_<0.5>(20at%La-10at%B), LaNi_<3.25>B_<0.25>M_<0.5>(20at%La-5at%B), LaNi_<4.85>B_<0.3>M_<0.5>(15at%La-4.5at%B). Then only LaNi_3B_<0.5>M_<0.5> alloy forms the amorphous phase, which absorbs the hydrogen of 0.6mass%. The rest of alloys such as LaNi_<3.25>B_<0.25>M_<0.5> consists of nearly LaNi_5 single phase, which becomes amorphous phase after absorbing hydrogen. But, LaN_<14.85>B_<0.3>M_<0.5> alloys absorb the hydrogen of around 1 mass% at 2MPa hydrogen pressure for all additional elements. After 30 hydride-dehydride cycle test, these crystallized alloys shows almost no degradation in comparison with LaNi_5 alloys, specially the alloy with Fe addition shows the prevention of pulverization of alloys.

本研究的目的是获得非晶态或纳米晶化的LaNi_5相，以延长目前使用的镍基电池的寿命。(1)LaNi_5相嵌入非晶相组织的开发合金：本研究成功地用熔体快淬法制备了La-Ni-B系大范围的非晶相。（LaNi_5）_（LaNi_B_6）_中LaNi_5相的形成温度约为500 ℃<0.8-0.7><12><0.2-0.3>。PCT测试表明，非晶相吸氢量较小，晶化后吸氢量增加，约为0.9mass%。(2)低硼含量La-Ni-B合金的非晶形成及其吸氢性能：研究了低硼含量LaNi_3B_<0.5>M_<0.5>（20at%La-10at%B），LaNi_<3.25>B_<0.25>M_<0.5>（20at%La-5at%B），LaNi_<4.85>B_<0.3>M_<0.5>（15at%La-4.5at%B）合金中非晶相的形成。只有<0.5>LaNi_3B_M_2<0.5>合金形成非晶相，并吸氢0.6mass%。其余的合金如LaNi_<3.25>B_<0.25>M_<0.5>等几乎都是单相的LaNi_5，吸氢后变成非晶相。但是，对于所有附加元素，LaN_<14.85>B_<0.3>M_<0.5>合金在2 MPa氢压下吸收约1mass%的氢。经30次脱氢-脱氢循环试验后，与LaNi_5合金相比，这些晶化合金几乎不发生降解，特别是添加Fe的合金，防止了合金的粉化。