臺灣博碩士論文加值系統

本研究目的是探討有關製備耐蝕性鈦鉬基複合材料之微結構及性質，並以粉末真空燒結法完成最佳之成品。鈦鉬基複合材料的優異物理性能是質量輕，機械性能佳，抗腐蝕性好。在本研究中，我們研究了Ti-8Mo-xNi複合材料在不同溫度下燒結後的顯微組織、機械性能和抗腐蝕性。在Ti-8Mo-xNi複合材料的β鈦相上形成顯著的Widmanstätten類結構。隨著Ni添加量的增加，Widmanstätten類結構中的針狀鎳化鈦金屬間化合物析出增加。 Ti-8Mo-6Ni複合材料具有相對較高的相對密度（94.9％）和硬度（42HRC），在1175℃下燒結1小時後，TRS值達到1177MPa。 且Ti-8Mo-xNi樣品易形成鈍化膜，將有助於產生更好的抗腐蝕性能。其中Ti-8Mo-6Ni複合材料還確定了添加碳化物後微結構之演變，通過真空燒結工藝，在各種溫度下添加不同含量NbC碳化物到Ti-8Mo-6Ni複合材料中，也找出機械和腐蝕性能的影響。在1275℃燒結1小時後，獲得NbC-1wt%樣品有較佳的燒結密度(99.7％)和硬度(48HRC)。在1275℃燒結1小時後，NbC試樣中出現最低的Icorr(3.21×10 -7 A•cm -2)和最高Rp(29172Ω•cm2)，有效地提高了抗腐蝕性。
我們還研究了Ti-8Mo-xCu複合材料在不同溫度下燒結後的顯微組織，力學性能和抗腐蝕性。 Ti-8Mo-12Cu複合材料在1200℃燒結後表現出優異的機械性能; 鈦複合材料在氯化鈉中的抗腐蝕性亦非常優異，它將完全適用於大氣環境。在燒結複合材料中，觀察到Ti2(Cu，Mo)過共析之析出相。接著鈦銅基複合材料也採用添加碳化物來實現分散強化的作用; 實驗結果顯示，添加不同碳化物（WC，TaC和ZrC）與鈦組合，形成碳化鈦和β穩定固熔相，隨著各種碳化物含量和燒結溫度的升高，微觀結構的相對密度增加，硬度和機械性能也顯著提高。添加5％的碳化鋯(ZrC)具有最優異的效果。燒結密度(98.9％)，硬度(45HRC)和橫向斷裂強度(1068MPa)顯著提高。加入不同的碳化物(WC，TaC和ZrC)與鈦組合形成碳化鈦和穩定的β固熔相，這種反應是原位析出強化的機理，且形成反應式2Ti + MC = TiC + Ti(M)，(M = Ta，W，Zr)。

The aim of this study is to explore the titanium-molybdenum matrix composites, using vacuum sintering to optimize the properties. The characteristics of titanium- molybdenum matrix composites, has lightweight, strong mechanical properties, and good resistance to corrosion. In this study, we investigated the microstructure, mechanical properties and corrosion resistance of Ti-8Mo-xNi composites after sintering at different temperatures. Significant Widmanstätten-like structures formed on the β titanium matrix of the Ti-8Mo-xNi composites. The acicular TiNi intermetallic compound precipitates within the Widmanstätten-like structure increased as the added amount of Ni increased. the Ti-8Mo-6Ni composites possessed a relatively high relative density (94.9%) and hardness (42 HRC), but the highest TRS value of 1177 MPa was reached after sintering at 1175°C for 1 h. Ti-8Mo-xNi specimens formed a passive film, which contributed to better anti-corrosion properties. The effects with NbC carbides added in the microstructural evolution, the mechanical and corrosion properties of Ti-8Mo-6Ni composites were also investigated, through the vacuum sintering process at various temperatures were determined the best results. After sintering at 1275°C for 1 hour, the sintered density (99.7%) and hardness (48 HRC) of the NbC-1 wt% sample were obtained. The lowest Icorr (3.21ⅹ10-7 A•cm-2) and highest Rp (29172 Ω•cm2) appeared in the NbC-1 specimens after sintering at 1275°C for 1 h, which effectively improved the corrosion resistance.
We also investigated the microstructure, mechanical properties and corrosion resistance of Ti-8Mo-xCu composites after sintering at different temperatures. Ti-12Cu-8Mo sintered alloys exhibited the excellent mechanical properties after sintered at 1200°C. Ti2(Cu, Mo) hypereutectoid phase was obviously observed in the sintered alloys. The titanium alloy for the corrosion resistance in sodium chloride is very excellent; it will be fully applied to the atmospheric environment. And then Titanium-based composites also use the addition of carbides to achieve the effect of dispersive precipitation strengthening. The experimental results show that, Adding different carbides (WC, TaC and ZrC), are combined with titanium to form titanium carbide and stable β phase, with the increasing of various carbide contents and sintering temperature, the relative density of microstructure increasing. Hardness and mechanical properties are also significantly improved. The addition of 5 wt% zirconium carbide (ZrC) has a most exceptional effect, The sintering density (98.9%), hardness (45 HRC) and transverse rupture strength (1068 MPa) were significantly improved. Adding different carbides (WC, TaC and ZrC), are combined with titanium to form titanium carbide and stable β phase, Such reaction after sintering at high temperature, revealed the mechanisms of in-situ precipitation strengthening, are the reaction as 2Ti + MC = TiC + Ti (M), (M = Ta, W, Zr).

Contents (目錄)
Chinese Abstract I
English Abstract II
Acknowledgements (誌謝) IV
Contents (目錄) V
List of Figures and Tables VII
List of Symbols XII
Chapter One. Ti-Mo-Ni -base Powder Composites by Vacuum Sintering Processes 1
1-1. Introduction 1
1-2. Experimental Procedure 5
1-3. Results and Discussion 8
1.3.1 Effect of Ni content and sintering temperature on microstructure 8
1.3.2 Effect of Ni content and sintering temperature on mechanical properties 14
1.3.3 Effect of Ni content and sintering temperature on corrosion resistance 18
1-4. Conclusions 23
Chapter Two. Ti-Mo-Ni-base Powder Composites with Carbides Additives by Vacuum Sintering Processes 24
2-1. Introduction 24
2-2. Experimental Procedures 25
2-3. Results and Discussion 27
2-4. Conclusions 36
Chapter Three. Ti-Mo-Cu-base Powder Composites by Vacuum Sintering Processes 37
3-1. Introduction 37
3-2. Experimental Procedure 38
3-3 Results and Discussions： 40
3-3-1. Microstructural Analysis of Titanium Composites: 40
3-3-2. Effect of Cu content and sintering temperature on mechanical properties 47
3-4. Conclusions 53
Chapter Four. Ti-Mo-Cu -base Powder Composites with Carbides Additives by Vacuum Sintering Processes 54
4-1. Introduction 54
4-2. Experimental Procedure 55
4-3.Results and Discussions 57
4-3-1. Effect of Carbides content on mechanical properties 57
4-3-2. Microstructure Analysis of Titanium Composites (Ti-8Mo-12Cu-xMC) 61
4-4. Conclusions 75
Chapter Five. General Conclusions of Corrosion-Resistance Powder Composites by Vacuum Sintering Processes 76
References 78
Appendix 83
A-1. Introduction : Cr-base Powder Composites by Vacuum Sintering Processes 83
A-2. Experimental Procedure 84
A-3. Results and Discussion 88
A-4. Conclusions 100

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