臺灣博碩士論文加值系統

高速火焰熱噴塗製程技術所形成之塗層，因其火焰速度快，具有高鍵結力、高密度與低孔隙率之優點，廣泛用於工業與航太零件上。本研究係使用兩種高速火焰之熱源（燃氣與燃料），將鈷基系材料之商用粉末噴塗至Inconel 718基材上，並在噴塗過程中使用即時監控系統觀察其兩種製程之火焰特性，如：熔融粉末之飛行速度、火炬溫度與能量等，並以SEM觀察金相組織結構之未熔顆粒及孔隙率，並使用相關儀器檢測塗層表面硬度、微硬度與塗層鍵結力，藉此探討此兩種熱源所製成的塗層之金相組織結構與機械性質的差異性。
實驗結果顯示在使用燃料高速火焰（High Velocity Oxy Liquid Fuel, HVOLF）噴塗所產生的粉末顆粒飛行速度為燃氣高速火焰（High Velocity Oxy Gaseous Fuel, HVOLF）的1.23倍，但在兩種的熱源所產生的火炬溫度與表面硬度結果並無明顯差異性。也因為HVOLF 熔融粉末的飛行速度大，具有較大的衝擊動能，使得金相組織結構較緻密，所以微硬度與鍵結力平均值都比HVOGF高，分別為1.20與1.65倍。在此次實驗參數條件下，利用燃料高速火焰（HVOLF）製程噴塗鈷基材料之商用粉末，在塗層金相組織內未融顆粒、孔隙率、微硬度與鍵結力等機械性質比使用燃氣高速火焰（HVOGF）更優異。

Due to its advantages such as fast flame velocity, bonding strength, high density and low porosity, thermal coatings applied by High Velocity Oxygen Fuel thermal spray technique is widely used in the industry and aero components.
The study uses commercial spray powder that is cobalt-based on substrate material Inconel 718 and observes the flame characteristics of the two processes (HVOGF and HVOLF) with monitoring system during thermal spray process. The characteristics to be observed include the velocity of molten particles, plume temperature and total intensity. The metallographic structure of the unmelted particles and porosity are also examined with SEM. Furthermore, the surface hardness, micro-hardness and bonding strength are to be examined with applicable equipment as well. After the experiment and observation, the study reviews the metallographic and mechanic differences between the two coatings that are produced by these two heat sources.
The result of the experiment shows that velocity of particles produced by HVOLF is 1.23 times faster than those produced by HVOGF. However, there is no apparent difference between the plume temperature and surface hardness produced by these two heat sources. Moreover, because of greater flying speed of the melted powder produced by HVOLF, it has greater impact to make more compact metallographic structure and the average values of its micro-hardness and bonding strength which are 1.20 and 1.65 times respectively is higher than those of HVOGF.
In this conditions of the experimental parameters, cobalt-based commercial spray powder that uses HVOLF thermal spray process performs better than HVOGF in terms of its mechanical properties such as unmelt particles in the metallographic structure, porosity, micro-hardness and bonding strength.

中文摘要 I
英文摘要 II
致謝 IV
目次 V
表目錄 VIII
圖目錄 X
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 2
1.3 文獻回顧 4
1.3.1 熱噴塗原理 4
1.3.2 塗層性質與結構組織 6
1.3.3 塗層種類與功能 7
1.3.4 熱噴塗製程分類 14
第二章 實驗方法與步驟 29
2.1實驗規劃 29
2.2實驗流程 32
2.3實驗材料與設備 33
2.3.1 試片規格 33
2.3.2 試片前處理 34
2.3.3 噴塗使用粉末 35
2.3.4 實驗參數規劃 37
2.3.5 金相試片製備 38
2.3.6 實驗設備 41
2.4 實驗程序 46
2.4.1 噴塗焰流監測 46
2.4.2 金相組織結構分析 47
2.4.3 表面硬度檢測 48
2.4.4 微硬度檢測 49
2.4.5 鍵結力檢測 50
第三章 結果與討論 52
3.1 噴塗焰流分析結果 52
3.1.1 顆粒速度 53
3.1.2 火炬溫度54
3.1.3 總強度量55
3.2 金相組織分析結果 58
3.2.1 未熔顆粒 59
3.2.2 孔隙率 59
3.3 表面硬度結果 67
3.4 微硬度結果 70
3.5 鍵結力結果 73
第四章 結論 77
參考文獻 80

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