本研究含下列耐火金屬膠結的複合硼化物與碳化物之熔融複材(或瓷金)的四個實驗主題。即: 1. 硼化物與不同膠結耐火金屬組成的最佳硼化物瓷金; 2. 硼化物瓷金孔洞成因與改善方法; 3. 硼化物瓷金之性質; 以及4. 少量硼化物和增量膠結金屬對碳化物瓷金性質的影響。本研究選用的硼化物與碳化物為IVB, VB以及VIB過渡金屬的硼化物與碳化物，如TiC, ZrC, NbB2與TaB2等。
本研究瓷金為典型含析出相的樹枝晶及樹枝間晶結構，由熱焓決定瓷金的微結構。硼化物瓷金的膠結相，在熔融時容易流失，而使瓷金有高硬度及低破裂韌性的特徵。
硼化物與碳化物複合瓷金，在硼化物加入碳化物瓷金並熔融後，原碳化物瓷金的膠結相與緻密層狀結構都減少了。相較硼化物瓷金，硼化物與碳化物複合瓷金的硬度稍微下降，破裂韌性稍微提升。
硼化物瓷金的室溫硬度介於1900至2300 HV之間，破裂韌性(KIC)介於5至8 MPa m1/2之間。硼化物與碳化物複合瓷金的硬度介於1300至2200 HV之間，破裂韌性(KIC)介於6至10 MPa m1/2之間。
1100oC下瓷金的硬度，在900至1400 HV之間，遠高於商用WC-6 Co。在6公斤荷重下與氧化鋁砂輪帶的磨耗阻抗可達96.8 m/mm3，稍低於商用WC-6 Co之135.7 m/mm3。

This study contains the following four investigated topics for refractory metal-cemented carbide-boride melted composites/cermets, i.e., 1. the optimal combinations for boride-refractory metal cermets (BRCs); 2. the occurring of voids in BRCs and its prevention; 3. the properties of BRCs; and 4. the effect of “minor” boride-“excess” refractory metal on the properties of carbide cermets. The selected carbides and borides are of IVB, VB, and VIB transition metals such as TiC, ZrC, NbB2, and TaB2. Cermets are with typical dendrite-interdendrite microstructure and with precipitate(s) that is determined by the enthalpy effect of the system. The loss of metal binder phase in boride cermets renders them a high hardness and a low fracture toughness. An addition of boride in carbide cermets also reduces the amount of the original metal phase and the dense of the original laminar structure. The RT hardness and KIC for boride and boride-carbide cermets respectively are 1900-2300 HV, 5-8 MPa m1/2 and 1300-2200 HV, 6-10 MPa m1/2. The 1100oC-hardness of the cermets ranges from 900 to 1400 HV, which is much superior to WC-6 Co, whereas the wear resistance in the 6-kg pin-on-Al2O3 belt abrasion test reaches 96.8 m/mm3, which is lower than the value of 135.7 m/mm3 in WC-6 Co.

摘要 I
Abstract II
致謝 III
目錄 VII
圖目錄 XIII
表目錄 XXXI
第1章 前言 1
第2章 文獻回顧 4
2.1碳化物簡介 4
2.1.1碳化物分類 4
2.1.2格隙型碳化物 6
2.1.3 共價型碳化物 15
2.2硼化物簡介 20
2.2.1 過渡金屬硼化物 20
2.2.2 二硼化鈦 24
2.2.3 二硼化鋯 32
2.2.4 TiB2-TiC-Ni-Mo瓷金複合材料 35
2.2.5 TiB2-ZrB2陶瓷 42
2.3 耐火金屬簡介 52
2.3.1 耐火金屬膠結相 52
2.3.2 TiC-W瓷金複合材料 55
2.4 瓷金複合材料 60
2.4.1瓷金複材背景 60
2.4.2 瓷金複材歷史 61
2.4.3 瓷金複材未來發展 63
2.4.4 瓷金複材粉末製備與常用製程 65
第3章 實驗步驟 69
3.1 實驗流程 69
3.2 實驗設計 70
3.3 複材製備 78
3.4 微結構觀察與成份分析 79
3.5 X-Ray繞射分析 81
3.6 維氏硬度量測 82
3.7 常溫Pin-on-belt擦損磨耗試驗 83
3.8 高溫硬度試驗 85
第4章 結果與討論 86
4.1微結構、硬度與破裂韌性分析 86
4.1.1 不同耐火金屬膠結相系列 86
4.1.1.1 B1B2 + Nb 87
4.1.1.2 B1B2 + Ta 90
4.1.1.3 B1B2 + Mo 92
4.1.1.4 B1B2 + W 95
4.1.1.5 小結 97
4.1.2 Boride + MC系列 99
4.1.2.1 + TiC 100
4.1.2.2 + ZrC 103
4.1.2.3 + HfC 106
4.1.2.4 + VC 108
4.1.2.5 + NbC 111
4.1.2.6 + TaC 113
4.1.2.7 + WC 116
4.1.2.8 + SiC 118
4.1.2.9 + B4C 121
4.1.2.10 小結 123
4.1.3 Boride Cermets系列 127
4.1.3.1 Single Boride 127
4.1.3.1.1 SB3 127
4.1.3.1.2 SB4 130
4.1.3.1.3 SB5 133
4.1.3.1.4 SB6 136
4.1.3.2 Binary Boride 139
4.1.3.2.1 B3B4 140
4.1.3.2.2 B3B5 142
4.1.3.2.3 B3B6 145
4.1.3.2.4 B4B5 148
4.1.3.2.5 B4B6 151
4.1.3.2.6 B5B6 154
4.1.3.3 Multi-Boride 158
4.1.3.3.1 (6B)6W4 158
4.1.3.4 小結 161
4.1.4 NT + Boride系列 167
4.1.4.1 + TZ 167
4.1.4.2 + H64 171
4.1.4.3 + N64 173
4.1.4.4 + T64 176
4.1.4.5 小結 179
4.1.5 膠結相增量系列 181
4.1.5.1 Binary Boride + W系列 182
4.1.5.1.1 B3B4 + W 183
4.1.5.1.2 B3B5 + W 186
4.1.5.2 Multi-Boride + W系列 189
4.1.5.2.1 (5B)5W5 189
4.1.5.2.2 (4B)4W6 192
4.1.5.3 NT + Boride + W系列 195
4.1.5.3.1 + N55 195
4.1.5.3.2 + T55 198
4.1.5.3.3 + N46 201
4.1.5.3.4 + T46 204
4.1.5.3.5 + 0.5N 207
4.1.5.3.6 + 0.5T 211
4.1.5.4 小結 214
4.1.6 機械性質結論 218
4.2 常溫Pin-on-belt擦損磨耗試驗 223
4.2.1 Boride Cermets系列 226
4.2.2 Boride + MC系列 252
4.2.3 膠結相增量系列 266
4.2.4 磨耗試驗結論 283
4.3高溫硬度試驗 285
第5章 結論 290
第6章 參考文獻 293

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