製程參數對WC-Ni與NiCrMo合金鋼真空硬銲 特性之影響

Effect of Processing Paraments on the Properties of Vacuum Brazed WC-Ni/NiCrMo Alloy Steel Joint

歐書宏(Shu-Hung Ou)

指導教授 ： 邱六合

大同大學/工程學院/材料工程學系所/碩士(2010年)

摘要

本研究係針對Ni基碳化鎢與SNCM439構造用合金鋼兩種異質材料，利用Cu-9Sn青銅片作為硬銲填料，進行真空硬銲接合。透過硬銲接合件之微觀結構觀察、硬度及剪切測試，選擇不同持溫時間作為硬銲參數，探討填料與不同Ni含量之碳化鎢界面反應以及不同結合金屬之碳化鎢異質硬銲接合件對環境耐沖蝕性。實驗結果顯示WC-14Ni/Cu-9Sn/SNCM439進行真空硬銲接合，在硬銲條件為1080℃持溫15分鐘時，有最大剪切強度361±13MPa。SEM微觀組織觀察，銲道有晶界及細小之白色點狀析出物的產生，且析出物在晶界處有堆積排列的情形，EPMA定量分析可得知點狀析出物主要為Sn-Ni的析出相。相同製程參數下，Ni基碳化鎢對銅錫填料之潤濕性大於Co基碳化鎢。沖蝕試驗結果顯示，Ni基碳化鎢接合件四小時沖蝕重量損失量大於Co基碳化鎢接合件。

關鍵字

真空硬銲 ； 剪切測試 ； 沖蝕測試 ； 鎳基結合金屬 ； 碳化鎢

並列摘要

The vacuum brazing of Cemented Tungsten Carbide (WC-Ni) and structural alloy steel using Cu-9Sn braze alloy has been studied. The microstructure observation, hardness and the shear strength of the brazed joint, the effect of the brazing time, interface reaction of filler and different Ni content in the cermet on the joint behavior have been discussed in the article. The experimental results show that the max shear strength of the joints, 361±13 MPa was derived at 1080°C 15 min. The SEM micrographs showed that many tiny white-spot precipitates were observed in the grain boundaries of the brazed zone and EPMA analysis evidenced that the precipitates were composed of Sn-Ni. The experimental results also manifested that the wettability of WC-Ni/SNCM439 and Cu-9Sn/SNCM439 joints were better than that of the WC-Co/KDA1. After four hours slurry erosion test, the mass loss of WC-Ni/SNCM439 joints was more than those of WC-Co/KDA1 joints have been proved.

並列關鍵字

Tungsten Carbide ； Vacuum Brazing ； Shear Test ； Slurry Erosion

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