真空硬銲製程和不同塡料對WC-Co與CrMo合金鋼真空硬銲件特性之影響

Effect of Vacuum Brazing Processes and Different Fillers on Properties of Vacuum Brazed WC-Co/CrMo Alloy Steel Joint

林韋廷(Wei-ting Lin)

指導教授 ： 邱六合

大同大學/工程學院/材料工程學系所/碩士(2009年)

摘要

本研究針對耐磨性高的碳化鎢與SCM440合金鋼進行真空硬銲接合，利用銅合金及BNi7作為硬銲填料。本實驗銅合金填料以硬銲溫度1080℃、持溫時間5~30分鐘作為真空硬銲接合參數，實驗結果顯示利用銅合金填料，剪切強度隨著持溫時間的增加而有上升的趨勢，在硬銲條件為1080℃持溫30min下有最大剪切力369±7MPa。從WC-Co/Cu-Sn/SCM440的SEM圖配合EPMA分析可以觀察到在WC-Co/Cu-Sn界面生成Fe-Co-Cu凝固層。BNi7填料以硬銲溫度940~1000℃、持溫時間5~15分鐘作為真空硬銲接合參數。實驗結果顯示利用BNi7填料，剪切強度約為140-170MPa。從WC-Co/BNi7/SCM440的SEM圖配合EPMA分析可以觀察到在填料區中有淺色鎳基固溶體相以及深色Ni3P脆性相。

關鍵字

構造用鋼 ； 剪切力 ； 微觀結構 ； 真空硬銲 ； 碳化鎢

並列摘要

Vacuum brazing of Cemented Tungsten Carbide (WC-Co) and JIS SCM440 steel using BNi7 and Cu-Sn braze alloys has been studied. The specimens using Cu-Sn braze alloys were brazed at 1080°C for 5 to 30 minutes. The experimental results show that the shear strength of the joints is increased with increasing bond time and the maximum shear strength is 369±7MPa for the joint brazed at 1080°C for 30 min. From SEM micrographs, a Fe-Co-Cu alloy layer was formed at WC-Co/Cu-Sn interface. The specimens using BNi7 braze alloy were brazed at the range from 940°C to 1000°C for 5 to 15 minutes. The experimental results show that the shear strength of the joints is fallen in the range of 140-170MPa. From SEM micrographs, the two phases of melted region were combined with the dark Ni3P intermetallic compound phase and the white Ni solid solution phase.

並列關鍵字

Shear strength ； Microstructure ； Vacuum brazing ； Cemented carbides ； Structure Steel

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