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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/72408


    Title: 高速火焰熔射製備鐵基非晶質合金塗層及其耐磨耗性與抗腐蝕性之研究;The Study of Wear and Corrosion Resistance of Fe-Based Metallic Glass Coating Prepared by HVOF Thermal Spray
    Authors: 林大新;Lin,Ta-Hsin
    Contributors: 機械工程學系
    Keywords: 鐵基金屬玻璃;高速火焰熔射;磨耗測試;腐蝕測試
    Date: 2016-07-25
    Issue Date: 2016-10-13 14:53:02 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 鐵基金屬玻璃以其高硬度、高強度、及耐腐蝕性著稱。而相比於其他種類基材如鈦基、鋯基之金屬玻璃,鐵礦資源更充沛,可有效降低成本並利於商業化。
    本研究分利用鐵基金屬玻璃成分Fe-Cr-Mo-C-B-Y-Co,融煉均勻後將其擊碎至40μm以下之粉末製備出結晶粉末。接著以機械合金法將結晶粉末轉化為非晶質結構。再以高速火焰熔射,將兩種粉末噴覆約200 μm的塗層在304不鏽鋼上。探究噴覆鐵基金屬玻璃後之其機械性質與電化學性質。
    從光學顯微鏡下顯示,兩種塗層的表面與剖面沒有顯著的裂痕或缺陷,以影像軟體分析,孔隙率為1%以下。XRD測試結果發現,非晶質粉末噴覆的圖層呈現寬廣繞射曲線,具有非晶質的結構。機械性質方面,維克式硬度分析結果,試片硬度從原本的262 ± 24 Hv提升到1150 ± 52 HV,使用碳化鎢球施5N正向力做磨耗測試,塗層磨耗率(1.910-6 mm3/Nm)與其塊狀金屬玻璃相近(2.310-6 Nm/mm3)且較SKD11模具鋼(1.410-5 Nm/mm3)低。
    在電化學性質上,噴塗過後的試片在3.5 wt%的氯化鈉,以動態極化法檢測,得出其腐蝕電位為-2.17 V腐蝕電流密度為2.310-08 A/mm2與316不鏽鋼(-0.22 V , 1.210-08 A/mm2)差異並不大,而塗層顯示出高達1.3 V的鈍化區間較316不鏽鋼(0.82 V)高。表面出優異的抗腐蝕性。
    整體來說,以高速火焰熔射製備鐵基金屬玻璃塗層,在耐磨耗及抗腐蝕表現優異。
    ;Fe-base metallic glass is famous for its high hardness high stress and good corrosion resistance. Compare to other kind metallic glass, Fe-base has higher stress and low coast.
    This study use Fe-Cr-Mo-C-B-Y-Co series composition bond coats on the 304 stainless steel by High Velocity Oxygen Fuel (HVOF) thermal spray. Investigate its mechanical properties and electrochemistry properties. Optical Microscope shows a homogeneous, crack-free surface and cross section. Hardness from 262 ± 24HV to 1066±53HV, In the wearing test, load 5N normal force at WC ball and get wearing resistance is about 5.3105(Nm/mm3). The wearing performance is better than SKD11(7.4104(Nm/mm3)). In the scratch test, HVOF coating also shows lower friction coefficient than SKD11 .
    The anodic polarization measurement of HVOF coating, we get the corrosion voltage is 0.2V, corrosion current is 8.510-6 A. For comparison we use 316SS and get corrosion voltage is -0.43V, corrosion current is 2.510-5 A. This test result shows HVOF coating exhibits a higher corrosion resistance, than the 316SS in 3.5 wt% Sodiμm chloride solution. Also we can observe significant pitting in 316SS by Optical Microscope.
    According to the result, Fe-base metallic glass coating by HVOF thermal spray, can improve the wearing performance and corrosion resistance.
    Appears in Collections:[機械工程研究所] 博碩士論文

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