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研究生:左啟宏
研究生(外文):Tso, Chi-Hong
論文名稱:複合濕鍍法製備含二硫化鉬及碳化矽之耐磨性自潤鍍層
論文名稱(外文):Preparation of Self-lubricant Wear-resistant films Containing MoS2 and SiC by Electroless Plating
指導教授:何主亮, 陳克昌
指導教授(外文):He Ju-Liang, Chen Keh-Chang
學位類別:碩士
校院名稱:逢甲大學
系所名稱:材料科學研究所
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:164
中文關鍵詞:二硫化鉬碳化矽磨潤行為自潤複合濕鍍
外文關鍵詞:MoS2SiCtribobehaviorself-lubricantcomposite plating
相關次數:
  • 被引用被引用:4
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中文摘要有鑑於機械元件之使用環境日益廣泛,潤滑劑之選擇亦朝向多
元化的方向發展,其中固體潤滑劑則是近年來發展較為迅速的一種潤滑劑
。舉凡液體潤滑劑會失效或無法使用的場合皆有固體潤滑劑存在的價值。
。本研究採用無電鍍鎳法,為使非極性二硫化鉬粉末分散於鍍浴,需先尋
找合適的界面活性劑。在找出合適的界面活性劑之後,於不同的pH值、溫
度及不同比率之二硫化鉬、碳化矽粉末添加量下在中碳鋼表面進行複合濕
鍍,並對鍍層進行400℃,1小時的熱處理。探討其微觀組織及機械性質。
利用X光繞射儀分析鍍層的晶體結構,SEM觀測鍍層的表面微觀形態,OM觀
測鍍膜的厚度,並以EDS分析鍍層內二硫化鉬及碳化矽的含量。鍍層的硬
度值以微小硬度機量測截面硬度。採用球對盤(Ball-on-Disk)試驗法對鍍
層進行磨耗試驗,以摩擦係數及磨耗損失評估複合鍍層的耐磨耗性。以
SEM觀察磨耗軌跡的表面形態,並以能量散佈分析儀進行磨耗軌跡的表面
分析,以推測可能的磨耗機構。實驗結果顯示:在含二硫化鉬複合鍍系統
中,使用HLB值大於11的界面活性劑便可使二硫化鉬粉末完全分散於鍍浴
中。但施鍍時要確保鍍液不會失效,則與所使用界面活性劑的結構有關,
實驗中發現,使用Triton X-100{SYMBOL 210 \f "Symbol"}會因施鍍溫度
超過其濁點而導致界面活性劑的失效;使用potassium oleate以及sodium
oleate會因對氫氣攻擊抵抗性的薄弱而導致鍍浴的失效。而不同的界面活
性劑也會對鍍液的可鍍範圍造成影響,其原因是隨二硫化鉬粉末吸附在基
材表面的界面活性劑阻礙了鎳離子的還原,而界面活性劑的碳鍊愈長影響
愈大。鍍層由瘤狀物體所構成,隨著鍍層中二硫化鉬含量的增加,覆蓋率
也隨之增加。,不論使用何種界面活性劑,二硫化鉬粉末共沉至鍍層內的
優選方位都是(002)基面平行基材表面,致使複合鍍層擁有一優良的磨潤
特性。隨著施鍍溫度的提高,二硫化鉬粉末共沉至鍍層內的優選方位會因
蠕動機率較大而更趨向於(002)基面平行基材表面。
英文摘要Due to the development of modern mechanical design for
various usage in different environment, solid lubricants has
became more and more important today. Wherever the failure
application of liquid lubricants, there requires solid
lubricants. MoS2 is one of the most widely used solid lubricant
material because of its spectacular hexagonal layered structure
of which the sulfur atom layers slides when submitted to wear.
The success of applying solid film lubricant on surface
determines the performance of the mechanical component. An
electroless nickel plating is employed in this study to prepare
the MoS2 and SiC containing nickel plating on plain carbon steel
as specimens which were subsequently heat treated at 400℃ and 1
hr. The hydrophobic nature of MoS2 hinders the dispersion of
itself into bath. It is therefore necessary to evaluate a proper
surfactant to make MoS2 uniformly dispersed. Meanwhile, pH
value, bath temperature and amounts of MoS2 and SiC in the bath
were changed. X-ray diffractor and SEM were used to reveal the
crystalstucture and surface morphology. OM was used to measure
the film thickness. EDS was used to measure the amounts of MoS2
and SiC codeposited in the films. A Ball-on-Disk wear test was
conducted to profile the tribobehavior of the film.Experimental
results in MoS2 composite film preparation a critical HLB value
of the surfactant of 11 is observed, over which can makes the
MoS2 powders dispersed uniformly in the bath. Exceptions can be
found on Triton X-100{SYMBOL 210 \f "Symbol"}, potassium oleate
and sodium oleate. Triton X-100{SYMBOL 210 \f "Symbol"} suffers
a cloud point at the bath temperature of 55℃, while potassium
oleate and sodium oleate create foams on the bath. A reduction
in the availability range of the plating bath is observed when
surfactant is added. It is supposed to be caused by the
absorption of hydrocarbon chain on substrate surface and
inhibits the reduction process of nickel ion. X-ray diffraction
analysis shows whatever kind of surfacants used, the preferred
orientation of the codeposited MoS2 is (002) in parallel to the
substrate surface. This makes the composite platings exhibit
lower friction coefficient than the electroless nickel plating.
Higher bath temperature benefits the migration of MoS2 powder in
the deposited layer and caused a stronger preferred orientation.
Nodules in the deposits all the way exist and lead to a rougher
surface.Maximun amounts of MoS2 codeposition occurs to the
surfactant Tween-20, which is ten fold comparing to Tween-80.
30wt% is reached in this study.Plastic deformation, spallation
and adhesion of the composite plating were observed on the worn
surface after sliding against the chromiun steel ball. A
dramatic reduction in wear loss comparing to the blank steel
substrate is achieved, accompanied with a small reduction in
friction coefficient. However, the friction coefficient is
decreased from 0.091 to 0.077 after heat treatment. Polishing
wear occurs in this case.In SiC composite plating system,
experimental results show that the amount of SiC in the
deposited film is increased as well as hardness value with
increasing adding amount of SiC powder in plating bath.
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