Kanlayasiri, Kannachai

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Preferred name
Kanlayasiri, Kannachai
Alternative Name
KANLAYASIRI, Kannachai
Kanlayasiri, K.
Main Affiliation
Email
kannachai.ka@kmitl.ac.th

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    Item type:Publication,
    Brazing of curved copper sheets using CuNiSnP amorphous filler metal
    (2019-09-30)
    Jattakul, Prajak
    ;
    Kanlayasiri, Kannachai
    This research investigates the effect of bending stress using furnace brazing on the interfacial layer between curved copper sheets and CuNiSnP amorphous filler metal. Copper sheet curvatures were varied between 5, 10, 15, 20, and ∞ mm to manipulate the bending stress of the base metal. The thermal behaviors and phase transformations of CuNiSnP amorphous filler metal were also characterized. The results showed that crystallization of the filler metal started at 200 °C, with multiple phases formed over the course of thermal treatment. The curved radius and bending stress were inversely correlated, while the interfacial layer of brazed joints and copper sheet curvatures were positively correlated. The interfacial layer was thin in small curvature specimens and thick in large radius specimens, indicating that the bending stress in the base metal affected the reliability of brazed joints.
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    Brazing of Porous Copper Foam with Copper Sheet Using CuNiSnP Amorphous Filler Metal
    (2021-01-01)
    Mookam, Niwat
    ;
    Jattakul, Prajak
    ;
    Rakphet, Tipsuda
    ;
    Kanlayasiri, Kannachai
    This research studies effects of the brazing time on interfacial microstructure of brazed joint between the porous copper foam (PCF) and Cu substrate using CuNiSnP amorphous filler metal. To examine the interfacial microstructure and its properties, an assessment of PCF/CuNiSnP/Cu brazed joints was conducted after electric furnace brazing under hydrogen (H2) atmosphere. The results showed that the interfacial microstructure was thick for short brazing time specimens and thin for prolonged brazing time specimens. The interfacial microstructures consisted of Cu-rich solid solution, (Cu, Ni)3P, and Cu3P as a eutectic structure discovered in the brazing region at different brazing times of 5, 10, and 20 min. Only the Cu-rich solid solution and (Cu, Ni)3P were found in the specimen with brazing time of 30 min. indicating that different brazing times affected interfacial microstructures and therefore reliability of the brazed joints.