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研究生： 陳昭蓉
Chen, Chao-Jung
論文名稱： 以雙盤研磨法製作WC/(Co-Cr-Mo-Ni) 超硬合金之開發研究
Development of WC/(Co-Cr-Mo-Ni) Cemented Carbide by Two-disk Milling
指導教授： 葉均蔚
Yeh, Jien-Wei
口試委員: 蔡哲瑋
Tsai, Tse-Wei
李勝隆
Lee, Sheng-Long
洪健龍
Hung, Chien Long
曹春暉
Tsau, Chuen-Hui
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學工程學系
Materials Science and Engineering
論文出版年： 2017
畢業學年度： 105
語文別： 中文
論文頁數： 228
中文關鍵詞： 超硬合金 、液相燒結 、雙盤研磨
外文關鍵詞： Hardmetals, Liquid Phase Sintering, Disk Milling
相關次數： 點閱：2  下載：0 
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    • WC-Co 超硬合金結合了高硬度之硬質碳化物 WC 與較韌的金屬膠結相，因此廣為應用於切削、鑽孔、模具等工具上。
    本研究為降低 WC/Co 超硬合金之成本且改善性質，在 Co 膠結相添加 Cr、Fe、Mo、Ni，並以雙盤研磨法進行粉末製備及液相燒結，並針對 Fe 和 Mo 變量以及碳含量、研磨次數等參數進行燒結試片微結構及性質之比較，期望能抑制 WC 粗化，使合金同時兼具高硬度及優異的破裂韌性。
    本研究表現最優異之成分配比，其硬度-破裂韌性組合可高於文獻中WC/Co超硬合金之 KIC-HV 帶狀分布曲線之上限，優於傳統液相燒結 WC/Co 超硬瓷金。將本研究所開發出的成分配比進行銑刀測試，發現其切削性質優於商用銑刀，表示本研究深具刀具的商業應用潛力。

    WC/Co hardmetals consist of hard carbide, WC, which provides hardness and metal binder phase, Co, which provides toughness. Therefore, hardmetals are widely used in machining, drilling and molding application.
    In this research, in order to cut down the cost of manufacturing WC/Co hardmetal and improve its properties, we add Cr, Fe, Mo, Ni element into the Co binder phase, and use disk milling method and liquid phase sintering to seek the best composition. To inhibit WC grain growth and coarsening, variation of Fe and Mo content, carbon content and milling times are also considered for improvement.
    In this study, we have successfully prepared WC/Co-Cr-Mo-Ni hardmetals. Their toughness-hardness distributions lie above the toughness-hardness band distribution curve limit of traditional WC/Co hardmetals. Their performances in the milling cutting test are also better than that of the commercial milling cutters, which means the WC/ Co-Cr-Mo-Ni system owns the commercial potential in the cutting tools.

    摘 要 I Abstract II 致謝 III 目 錄 VIII 圖目錄 XIV 表目錄 XXII 壹、前言 1 貳、文獻回顧 4 2.1 超硬合金 4 2.1.1 超硬合金簡介 4 2.1.2 超硬合金發展歷史 8 2.1.3 近代超硬合金及未來發展趨勢 12 2.1.4 超硬合金應用 15 2.2 影響超硬合金機械性質因素 16 2.2.1 晶粒尺寸大小 16 2.2.2 金屬膠結相含量 17 2.2.3 金屬膠結相對碳化物的溶解度及潤濕能力 18 2.2.4 多元碳化物的添加 20 2.2.5 WC/WC 界面連續性(Contiguity) 24 2.3 粉末製備方式 26 2.3.1 粉末製備方式簡介 26 2.3.2 高能球磨法 32 2.3.3 噴霧轉化法 36 2.4 燒結方式及機制 38 2.4.1 固相燒結 39 2.4.2 液相燒結 42 2.4.3 燒結方式簡介 49 2.5 高熵合金 54 2.5.1 高熵合金發展背景 54 2.5.2 高熵合金之特性 56 參、實驗方式 59 3.1 成分設計與流程 59 3.2 模擬相圖 61 3.3 雙盤研磨法製程 62 3.3.1 第二代雙盤研磨機台設計與改良 62 3.3.2 雙盤研磨機操作流程 65 3.4 粉末成型及燒結 67 3.4.1 水平球磨 67 3.4.2 生胚成型 67 3.4.3 燒結製程 68 3.5 性質量測與其他分析 71 3.5.1 X-Ray 繞射分析 71 3.5.2 微結構與 EDS 成分分析 71 3.5.3 密度量測 72 3.5.4 硬度與破裂韌性量測 73 3.5.5 銑刀切削測試 75 3.5.6 Image J 影像分析 78 3.5.7 熱傳導係數量測 80 肆、結果與討論 81 4.1 原始粉末形貌 81 4.2 金屬膠結相 Mo 成分變量之結果 83 4.2.1 WC-20M0-0.5CB 88 4.2.2 WC-20M1-0.5CB 92 4.2.3 WC-20M2-0.5CB 97 4.2.4 WC-20M3-0.5CB 102 4.2.5 WC-20M4-0.5CB 107 4.2.6 機械性質與其他性質比較 112 4.3 補碳多寡對於試片之影響 115 4.3.1 表面結構比較 116 4.3.2 XRD 圖比較 120 4.3.3 機械性質與其他性質比較 122 4.4 Fe 元素的影響 128 4.4.1 微結構與 XRD 分析 129 4.4.2 機械性質與其他性質比較 132 4.5 研磨次數之影響 134 4.5.1 微結構與 XRD 分析 135 4.5.2 機械性質與其他性質比較 141 4.6 不同金屬膠結相含量之塊材製備 144 4.6.1 WC-25M1(-Fe) 147 4.6.1.1 微結構與 XRD 分析 147 4.6.1.2 機械性質與其他性質比較 152 4.6.2 WC-15M1(-Fe) 155 4.6.2.1 微結構與XRD分析 155 4.6.2.2 機械性質與其他性質比較 160 4.6.3 WC-12.5M1(-Fe) 163 4.6.3.1 微結構與 XRD 分析 163 4.6.3.2 機械性質與其他性質比較 168 4.6.4 WC-10M1(-Fe) 172 4.6.4.1 微結構與 XRD 分析 172 4.6.4.2 機械性質與其他性質比較 176 4.6.5 WC-10Co-1VC 178 4.6.5.1 微結構與 XRD 分析 178 4.6.5.2 機械性質與其他性質比較 183 4.7 試片硬度與破裂韌性組合總整理 185 4.8 銑刀切削測試 189 4.8.1 一吋試片製備 195 4.8.2 切削 304 不鏽鋼 199 4.8.3 切削 SKD11 冷工具鋼 206 4.8.4 綜合比較 214 伍、結 論 217 陸、本研究貢獻 220 柒、建議未來研究方向 221 捌、引用文獻 222

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