原位压力变化下的置换测量评价 LaNi 作为储氢合金致动器的适用性。

Suitability Evaluation of LaNi as Hydrogen-Storage-Alloy Actuator by In-Situ Displacement Measurement during Hydrogen Pressure Change.

机构信息

Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama, Kanagawa 240-8501, Japan.

Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama, Kanagawa 240-8501, Japan.

出版信息

Molecules. 2019 Jul 1;24(13):2420. doi: 10.3390/molecules24132420.

DOI:10.3390/molecules24132420

PMID:31266151

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6650907/

Abstract

The swelling ability of LaNi for application to hydrogen-storage-alloy (HSA) actuator is discussed through the measurement of the swelling ratio in hydrogen. The HSA actuator is driven by hydrogen pressure change causing the swelling of HSA. LaNi is one of the candidate materials for HSA actuators as well as palladium. Some prototypes of HSA actuators using LaNi have been fabricated; however, the kinetic swelling ability of LaNi itself has been not investigated. In this paper, the authors investigated the static and kinetic swelling ability of LaNi powder under hydrogen atmosphere. The results showed that the swelling ratio increased by 0.12 at the phase transition pressure. Response time decreased with an increase in the charged pressure during absorption, while it remained constant during discharge. Reaction kinetics revealed that these swelling behaviors were explained by hydrogen absorption and lattice expansion. The swelling ability of LaNi was also compared with that of palladium. The results show that LaNi swells 1.8 times more than palladium under 0.5 MPa. LaNi is suitable for an actuator driven repeatedly under more than the phase transition pressure. Palladium can be used for one-way-operation actuator even under 0.1 MPa since its response time during the evacuation was much longer than during the pressurization.

摘要

通过测量在氢气中的膨胀比，讨论了 LaNi 用于储氢合金 (HSA) 致动器的膨胀能力。HSA 致动器由氢气压力变化驱动，导致 HSA 膨胀。LaNi 是 HSA 致动器以及钯的候选材料之一。已经制造了一些使用 LaNi 的 HSA 致动器原型，但是，尚未研究 LaNi 本身的动力学膨胀能力。在本文中，作者研究了在氢气气氛下 LaNi 粉末的静态和动力学膨胀能力。结果表明，在相变压力下，膨胀比增加了 0.12。在吸收过程中，随着充电压力的增加，响应时间减少，而在放电过程中保持不变。反应动力学表明，这些膨胀行为是由氢吸收和晶格膨胀解释的。还比较了 LaNi 的膨胀能力与钯的膨胀能力。结果表明，在 0.5 MPa 下，LaNi 的膨胀比钯多 1.8 倍。LaNi 适用于在超过相变压力下反复驱动的致动器。钯即使在 0.1 MPa 下也可用于单向操作致动器，因为在抽空期间的响应时间比加压期间长得多。