臺灣博碩士論文加值系統

本研究主要在探討添加六方晶氮化硼材料，對鎳-鋁合金熔射塗層機械性質的影響。氮化硼藉由混合和機械研磨的方式混入鎳-鋁合金中，藉由電漿熔射及高速火焰熔射技術於304不?袗?基材上製作成為塗層，以提升塗層的潤滑性質；本研究亦在熔射塗層中添加碳化鎢-鈷材料，以提升塗層的硬度及耐磨耗性質。熔射塗層製作過程中，藉由飛行粒子監控系統取得飛行粒子的溫度及速度資訊；製作完成後的塗層，藉由後續的光學顯微結構分析、掃描式電子顯微結構分析、穿透式電子顯微結構分析、X光繞射成分分析、孔隙率分析、微硬度分析、磨耗試驗及鍵結強度試驗等，以觀察塗層的物理及化學性質。最後的結果呈現，添加六方晶氮化硼後藉由熔射技術製作的複合塗層，摩擦係數可由0.7降至0.3；並且由於熔射過程中，粒子撞擊所產生的高溫及高壓，造成六方晶氮化硼相轉變為非晶質相、Turbostratic相或立方晶相氮化硼，相變化後的塗層具有較為良好的抗滑動磨耗特性。

This paper investigates the effects of adding a hexagonal boron nitride (h-BN) material on the material properties of the thermal sprayed Ni-Al coatings. The h-BN powder was mixed with the Ni-Al powder by blending or ball milling. They were sprayed on SUS304 substrate via plasma spray or high velocity oxygen fuel spray. WC-Co powder was also added into the coating to improve the hardness and the wear resistance. A DPV-2000 was used to monitor the temperature and velocity of the in-flight particles during spraying. Optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, porosity analysis, microhardness test, wear test and bond test were used to examine the properties of the coatings. The results show that the friction coefficient of the coating was reduced from 0.7 to 0.3 by adding h-BN. The high temperature and high pressure during spraying caused the molten or semi-molten droplets impinge harshly onto the substrate, resulting in the transformation from h-BN phase to an amorphous, turbostratic or cubic boron nitride phase. This transformation reflected on a better property of sliding wear resistance.

摘 要 i
ABSTRACT ii
誌謝 iii
目 錄 iv
表目錄 vi
圖目錄 vii
第一章 前言 1
第二章 文獻探討 3
2.1. 熔射技術原理 3
2.1.1. 電漿熔射技術 8
2.1.2. 高速火焰熔射技術 9
2.2. 磨耗原理 10
2.2.1. 磨耗種類 11
2.2.2. 磨耗的表面防護 14
2.3. 熔射塗層材料 14
2.3.1. 六方晶氮化硼 14
2.3.2. 鎳-鋁合金 18
2.3.3. 碳化鎢-鈷 20
2.4. 熔射後塗層性質與結構 21
2.5. 添加物對熔射塗層的影響 27
第三章 實驗方法 30
3.1. 粉末原料及試片準備 31
3.2. 飛行粒子觀測及撞擊粒子擷取 33
3.3. 熔射塗層製作 35
3.4. 磨耗試驗 36
3.5. 塗層性質分析 38
3.5.1. 塗層堆積效率分析 38
3.5.2. 光學顯微鏡觀察 38
3.5.3. 掃描式電子顯微鏡觀察 39
3.5.4. 穿透式電子顯微鏡觀察 39
3.5.5. 聚焦式離子束顯微切割儀取樣 40
3.5.6. X光繞射分析 40
3.5.7. 孔隙率分析 40
3.5.8. 微硬度分析 41
3.5.9. 鍵結強度分析 41
第四章 結果與討論 43
4.1. 添加氮化硼材料對電漿熔射鎳-鋁合金塗層的影響 43
4.1.1. 粉末顯微結構 43
4.1.2. 塗層堆積效率 45
4.1.3. 塗層顯微結構 46
4.1.4. X光繞射分析 49
4.2. 添加碳化鎢-鈷對電漿熔射鎳-鋁/氮化硼複合塗層的影響 50
4.2.1. 粉末顯微結構 50
4.2.2. 塗層堆積效率 51
4.2.3. 塗層顯微結構 52
4.3. 添加氮化硼材料對高速火焰熔射鎳-鋁合金塗層的影響 57
4.3.1. 粉末顯微結構 57
4.3.2. 粒子觀察 59
4.3.3. 塗層顯微結構 61
4.3.4. 高速火焰熔射過程對氮化硼結構造成的改變 69
4.4. 磨耗性質 76
第五章 結論 89
第六章 參考文獻 90

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