功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2013年
21期
3103-3107
,共5页
张虎%刘丹敏%王少博%肖卫强%张振路%岳明%张久兴
張虎%劉丹敏%王少博%肖衛彊%張振路%嶽明%張久興
장호%류단민%왕소박%초위강%장진로%악명%장구흥
放电等离子烧结%室温磁制冷材料%居里温度%MnFePGe系
放電等離子燒結%室溫磁製冷材料%居裏溫度%MnFePGe繫
방전등리자소결%실온자제랭재료%거리온도%MnFePGe계
spark plasma sintering%room temperature magnetic refrigerant%Curie temperature%MnFePGe alloys
利用机械合金化和放电等离子烧结技术制备了Mn2-xFexP1-yGey(x=0.8、0.9,y=0.2、0.24、0.26)磁制冷材料。采用XRD、中子衍射及 SEM分析手段,系统研究了该系列材料的成相与球磨时间、烧结温度、烧结压力和保温时间的关系。分析了烧结样品的相结构和显微组织,发现随着烧结温度的升高杂质相逐渐减少,形成了稳定的该系列磁制冷材料的制备工艺。对不同组分 Mn2-x Fex P1-y Gey 合金的相变过程和磁热性能进行了分析,其中 Mn1.2 Fe0.8 P0.74 Ge0.26的居里温度为277.4K 接近于室温区间,滞后为3K、熵变为21.5J/(kg·K),是一种较理想的磁制冷工质材料。
利用機械閤金化和放電等離子燒結技術製備瞭Mn2-xFexP1-yGey(x=0.8、0.9,y=0.2、0.24、0.26)磁製冷材料。採用XRD、中子衍射及 SEM分析手段,繫統研究瞭該繫列材料的成相與毬磨時間、燒結溫度、燒結壓力和保溫時間的關繫。分析瞭燒結樣品的相結構和顯微組織,髮現隨著燒結溫度的升高雜質相逐漸減少,形成瞭穩定的該繫列磁製冷材料的製備工藝。對不同組分 Mn2-x Fex P1-y Gey 閤金的相變過程和磁熱性能進行瞭分析,其中 Mn1.2 Fe0.8 P0.74 Ge0.26的居裏溫度為277.4K 接近于室溫區間,滯後為3K、熵變為21.5J/(kg·K),是一種較理想的磁製冷工質材料。
이용궤계합금화화방전등리자소결기술제비료Mn2-xFexP1-yGey(x=0.8、0.9,y=0.2、0.24、0.26)자제랭재료。채용XRD、중자연사급 SEM분석수단,계통연구료해계렬재료적성상여구마시간、소결온도、소결압력화보온시간적관계。분석료소결양품적상결구화현미조직,발현수착소결온도적승고잡질상축점감소,형성료은정적해계렬자제랭재료적제비공예。대불동조분 Mn2-x Fex P1-y Gey 합금적상변과정화자열성능진행료분석,기중 Mn1.2 Fe0.8 P0.74 Ge0.26적거리온도위277.4K 접근우실온구간,체후위3K、적변위21.5J/(kg·K),시일충교이상적자제랭공질재료。
Mn2-xFexP1-yGey(x=0.8,0.9,y=0.2,0.24,0.26)magneto-caloric compounds have been prepared by mechanical alloying (MA)and subsequent spark plasma sintering (SPS)technique.XRD,neutron diffrac-tion and SEM were used to analysis the influences of the ball milling time,sintering temperature,pressure and time on the phase formation systematically.A stable preparation technique for the MnFePGe magneto-caloric materials was established.It was found that the quantity of the impurity decreased as the temperature increas-ing.The magnetic phase transition process and magnetocaloric properties of the Mn2-x Fex P1-y Gey alloys were investigated by DSC and SQUID.The compound Mn1.2 Fe0.8 P0.74 Ge0.26 was expected to be a suitable candidate for a magnetic refrigeration applications with a small thermal hysteresis (3K),a Curie temperature close to room temperature (277.4K),and a large magnetocaloric effect (ΔSDSC=21.5J/(kg·K).