Pd包覆TiZrNiCo的抗毒化及动力学性能.pdfVIP

第25卷第2期 中国有色金属学报 2015年2月 Volume25Nmu ber2 TheChineseJournalofNOUferrousM etals February2015 文章编号：1004．0609(2015)02—0449—09 Pd包覆TiZrNiCo的抗毒化及动力学性能 潘昌盛，郭秀梅，王树茂，刘 晶，刘晓鹏，蒋利军 (北京有色金属研究总院 能源材料与技术研究所，北京 100088) 摘 要：采用化学镀方法在TiZrNiCo合金颗粒表面包覆上0．4～2pm厚的Pd膜，并测得不同膜厚的Pd／TiZrNiCo 试样在混合气体中的吸氢动力学。结果表明：Pd膜越薄，Pd／TiZrNiCo抗毒化性能及吸氢动力学性能越好，0．4larn 厚Pd膜试样的吸氢量为2pan厚Pd膜试样的1．6倍。Pd／TiZrNiCo试样吸放氢后粉化，引发Pd膜破裂导致吸氢 速率减缓与基体粉化引发吸氢速率加快的两种效果，吸氢量随吸放氢次数的增加而出现波动性的上升回落。根据 吸氢机理及毒化机理，提出并采用相应的动力学模型，并对TiZrNiCo吸纯氢及Pd／TiZrNiCo吸氢动力学曲线进行 了拟合。 关键词：Pd膜；抗毒化；动力学；循环寿命；动力学模型 中图分类号：TG139．7 文献标志码：A Poisoningresistanceandkineticspropertiesof TiZrNiCocoatedbyPd PANChang-sheng，GUOXiu-mei，WANGShu—mao，LIUJing，LIUXiao—peng，JIANGLi-jun (InstituteofEnergyMaterialsandTechnology,GeneralResearchInstiutteforNon—ferrousMetals， Beijing100088，China) Abstract：Pdmembrna eswith thicknessof0．4—2 gnaweredeposited onthesurfaceofTiZrNiCOalloyparticlesby electrolessplatingmethod．HydrogenabsorptionkineticsofPd／TiZrNiCowasmeasuredundermixedgas．Theresults show htat，ofrthePd／TiZrNiCo，hte thinnerhtePdmembrane，htebeRerthepoisoningresistanceandhyrdogen adsoprtion kineticproperties．TllepulverizationofPd／TiZrNiCo afterhyrdogen absoprtion—desoprtion leadshtetwo results，suchasthedecreaseofhyrdogenabsoprtioncausedbythePdmembrnaerupturena dhteincreaseofhyrdogen absoprtioncausedbyPdpulverization．Therefore，thehyrdogenabsoprtion·desoprtionrepeatingleadstothefluctuation ofhyrdogenabsoprtionquantityofPb／TiZrNiCo．Kineticmodelofrhyrdogenabsoprtionunderpurehyrdogennadmixed gaswasbuiltbasedonhyrdogenabsoprtionnadimpuritygaspoisoningmechanism．111ehyrdogenabsoprtiondynami