臺灣博碩士論文加值系統

鎳基合金和碳化鎢（WC）的複合材料已被廣泛應用於各種領域中，由於鎳合金的高耐腐蝕性和碳化鎢的高耐磨損性。真空燒結是有效製造硬質合金的方法，可以防止材料氧化和脫碳現象。在這項研究中，在不同的成分比例Ni60合金（Ni/Cr/B/Si）和WC組成的複合材料(30.0 - 39.4 vol% WC)以不同的燒結燒結溫度（1125℃、1150℃、1175℃、1200℃）進行。優化結果顯示，碳化鎢複合材料30.0 vol％WC在1175℃，硬度達 HV889 kgf / mm2和較低的腐蝕速率7.26 mg / cm2 / hr，測試用70 % 硫酸。根據XRD、SEM和EDS微觀結構的分析顯示，燒結溫度的升高至1200℃，產生W2C及 Ni2W4C造成 Ni60-WC複合材料硬度及耐腐蝕性的下降。

Composites based on nickel alloys and tungsten carbide (WC) have been widely used in various fields, due to high corrosion resistance of nickel alloys and the high wear resistance of tungsten carbide. Vacuum sintering process is an effective method for producing cemented carbides as the vacuum environment can prevent the materials from being oxidized and decarburized. In this study, composite materials composed of Ni60 (Ni/Cr/B/Si) and WC at various composition ratios (30.0 To 39.4 vol% WC) were sintered at different sintering temperatures (1125°C, 1150°C, 1175°C and 1200°C). Optimized results indicated that the composite with 30.0 vol% WC in the composite sintered at 1175 o C, a hardness as high as Hv 889 kgf / mm2 and a corrosion rate as low as 7.26 mg / cm2 / hr, tested using 70% sulfuric acid, can be achieved. The microstructural analysis based on XRD, SEM, and EDS indicated that Sintering temperature to 1200℃, will produce W2C and Ni2W4C, resulting in a decline Ni60-WC composite hardness and corrosion resistance.

摘要 I
ABSTRACT II
目錄 IV
圖目錄 VII
表目錄 X
第一章 緒論 1
1.1前言 1
1.2 研究目的與動機 2
第二章 基礎理論 3
2.1 Ni60粉末 3
2.2 WC-Ni與 WC-( Fe, Co) 3
2.3 Ni60-WC 系統 6
2.4 (Ni-Si)-WC系統 7
2.5(Ni-B)-WC系統 9
2.6 (Ni-Cr)-WC 系統與Ni-Cr2C3 10
2.7 (Ni-Cr-B-Si-Fe)-WC系統 11
2.8 添加其它合金元素作為WC金屬黏結劑之目的 12
2.9 添加其他元素所產生之化合物 13
2.10 影響WC複合材料機械性質因素 15
2.11 影響WC複合材料燒結因素 17
第三章 實驗設備與研究方法 21
3.1 實驗儀器 21
3.2 實驗流程 22
3.3 原始粉末 23
3.4 真空燒結 27
3.5 性質分析 28
3.5.1 孔隙率檢測 28
3.5.2 相對密度檢測 29
3.5.3 金相觀察 29
3.5.4 掃描式電子顯微鏡 29
3.5.5 硬度試驗 30
3.5.6 X-ray 繞射 30
3.5.7 腐蝕試驗 30
第四章 結果與討論 32
4.1 孔隙率分析 32
4.2 相對密度分析 33
4.3 SEM表面分析 34
4.4 硬度試驗分析 39
4.5 XRD繞射分析 41
4.6 微結構成分組成 45
4.7 腐蝕試驗分析 59
4.8各分析相互影響 61
第五章 結論 64
參考文獻 65

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