Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/9328
標題: 鎳-銦反應生成介金屬之研究
Intermetallics Formation in Nickel-Indium System
作者: 洪尚河
關鍵字: Intermetallic;介金屬;Nickel;Indium;鎳;銦
出版社: 材料工程學研究所
摘要: 
本研究主要是探討於N2/H2=9還原性氣氛中,溫度範圍為200∼600℃(高於銦的熔點157℃),持溫時間1小時,鎳與銦的反應。我們主要是以鎳坯/銦箔/鎳坯之三明治結構,探究鎳與銦固-液反應所形成的介金屬化合物,研究重點為介金屬之結晶相變化、微結構及成分等變化。
鎳與銦於200℃、250℃、270℃與300℃的溫度,反應後所形成的介金屬化合物只有Ni3In7。在350℃與400℃則有Ni3In7與Ni2In3兩相。而在450℃則只有單一相的Ni2In3。於500℃也有兩相,Ni2In3及NiIn。到550℃與600℃時則只剩NiIn。介金屬相會隨著溫度的增加,逐漸由銦含量較多的介金屬變成銦含量較少的介金屬(Ni3In7→Ni2In3→NiIn),此結果與文獻中“Walser-Bene” rule及Pretorius et al. “effective heat of formation”之預測結果是一致的。
另外我們經過X光繞射圖形、空間群(space group)、結構(structure)與晶格常數(lattice parameter)的比較,以及EPMA定量分析後發現,介金屬Ni10In27、Ni28In72與Ni3In7是屬於同一種介金屬化合物,且最可能的表示法為Ni3In7。
此外我們也發現介金屬Ni3In7具有不同大小的短柱狀體微結構,大的短柱狀體直徑約10∼12 m,小的短柱狀體直徑約1∼3 m,此二者的長寬比都約在1∼3之間。
介金屬Ni2In3是由Ni3In7的局部開始產生變化,最後才整個變為Ni2In3,其形貌為不規則的長條狀微結構。因為介金屬Ni3In7並不是非常緻密的結構,因此由Ni3In7變化成Ni2In3的相變化過程,應是鎳坯中的鎳藉由介金屬間的空隙快速擴散至Ni3In7所致。而介金屬NiIn也同樣是先由Ni2In3局部微結構開始變化,最後因Ni2In3的聚集變成NiIn,其形貌是一整塊類似蜂巢狀的微結構。其形成原因應與上述類似。

The objective of this research is to investigate the reactions of Ni and In ranging from 200C to 600C in N2/H2=9. We used Ni pellet/In foil/Ni pellet sandwiched samples to study the formation of Ni-In intermetallics from solid—liquid reactions. This study focused on the investigation of the phase transformation and changes in the microstructures of the intermetallics.
Ni3In7 phases appeared at temperatures above 200C. At 350C and 400C, both Ni3In7 and Ni2In3 phases existed. When temperature reached 450C, only Ni2In3 exist. Both Ni2In3 and NiIn phases existed at 500C, while only NiIn existed at 550C and 600C. We found that the intermetallic compounds changed from In-rich phases to Ni-rich phases (Ni3In7→Ni2In3→NiIn) with increasing temperature. This result is consistent with the “Walser-Bene” rule and the results of “effective heat of formation” predicted by Pretorius et al. In addition, by comparing X-ray diffraction pattern, space group, crystal structure, lattice parameter, and EPMA quantitative analysis, We found that Ni10In27, Ni28In72 and Ni3In7 which were not distinguished in the literature are actually the same intermetallic compound.
Ni3In7 possesses two types of grains, one is faceted and the size is about 10~12 m while the other is not and the size is about 1~3 m. The shapes of Ni2In3 and NiIn are irregular stripes and honeycomb-like, respectively. The Ni pellets were found to dissolve party into adjacent liquid In when temperatures are higher than the melting point of In. Then the Ni3In7 phase which possessing the lowest melting point intermetallic precipitated first. Ni3In7 would further transform into Ni2In3 when Ni diffused through porous intermetallics into Ni3In7. The transformation phenomena of Ni2In3 to NiIn is similar.
URI: http://hdl.handle.net/11455/9328
Appears in Collections:材料科學與工程學系

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