Annealing Phenomena in the Electroformed Invar FMM

In the OLED display industry, Invar(Fe-36%Ni) exhibiting anomalous low thermal expansivity is commonly used as a material for the fine metal mask (FMM), which guides the evaporated diode materials through its small holes onto the correct positions of the substrate glass. We are investigated that the...

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Veröffentlicht in:Meeting abstracts (Electrochemical Society) 2024-11, Vol.MA2024-02 (22), p.1948-1948
Hauptverfasser: KIM, In Gyeong, Lee, Jun Ha, Shin, Se Eun, Park, Yong Bum
Format: Artikel
Sprache:eng
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Zusammenfassung:In the OLED display industry, Invar(Fe-36%Ni) exhibiting anomalous low thermal expansivity is commonly used as a material for the fine metal mask (FMM), which guides the evaporated diode materials through its small holes onto the correct positions of the substrate glass. We are investigated that the coefficient of thermal expansion (CTE) as a function of the alloy composition before and after annealing in the Fe-Ni alloys consisting of the α(BCC) and γ'(FCC)phases fabricated by using an electroforming method. The CTE-composition curve of the electroformed Fe-Ni alloys was measured to be different from that of the pyrometallurgically produced Fe-Ni alloys. The electroformed Invar can perform low CTEs via thermomechanical heat treatment where the a phase and γ′ phase in the as-deposited state are transformed into the γ″(FCC) phase. During annealing of the electroformed Invar, the as-deposited texture with the α //ND + γ′ //ND components was changed into the the major //ND and minor //ND components. This texture evolution occurring during annealing has been explained in terms of a combined effect of abnormal grain growth (AGG) and the α → γ″ (or α → γ'→ γ″) phase transformation.
ISSN:2151-2043
2151-2035
DOI:10.1149/MA2024-02221948mtgabs