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研究生:郭明祐
研究生(外文):Kuo,Ming-Yuo
論文名稱:基材硬度及粗糙度對碳化釩塗層之黏附特性的影響
論文名稱(外文):Effect of Substrate Hardness and Roughness on Adhesion Characteristics of Vanadium Carbide Coatings
指導教授:李榮宗; 邱源成
指導教授(外文):Rong-Tsong, Lee; Yuang-Cherng, Chiou
學位類別:碩士
校院名稱:國立中山大學
系所名稱:機械工程研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:1996
畢業學年度:84
語文別:中文
論文頁數:108
中文關鍵詞:刮痕試驗黏附硬度粗糙度碳化釩
外文關鍵詞:Scratch testAdhesionHardnessRoughnessVanadium Carbide
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本研究使用自行開發之刮痕試驗機,對以高溫鹽浴法(TD)處理數種鋼材表
面被覆碳化釩(VC)塗層進行刮痕試驗,量測在刮擦試驗中之切線力變化,
並使用光學顯微鏡觀察刮道表面的破壞現象,以決定臨界負荷。結果顯示
,當基材硬度增加,塗層厚度減少,則易產生拉伸裂縫;反之,則易出現
順應隆起之裂縫。而在硬基材SK3與 SKH51及塗層厚10μm與6μm之試驗,
兩種裂縫會同時產生。且隨基材硬度增加,塗層厚度增厚而剝落面積增大
。同時,隨基材硬度增大、塗層厚度增厚及刮擦速度減慢而臨界負荷增大
。此外,使用基材SK3其臨界負荷會隨著基材粗糙度增加而減小,但是使
用其他基材則其臨界負荷並無明顯變化。在黏附特性的比較方面,因塗層
發生剝落時,並無露出基材,顯示基材與VC塗層之黏附力比VC塗層與VC塗
層之黏附力好;同時發現,SKH51高速鋼與 VC塗層間的黏附性比SKD11、
SK3及S45C好。實驗結果顯示當基材硬度愈高、塗層厚度愈厚及刮擦速度
愈快時,切線摩擦力的轉變愈明顯,較易決定其臨界負荷;然而所以在低
基材硬度、薄的塗層以及較慢的刮擦速度實驗下,必須輔以破壞機構之觀
察才能決定臨界負荷。

In this study, a series of scratch tests are conducted for
various VC coating specimens deposited by Toyota Diffusion
Processing. The measured tangential friction force with the
corresponding failure phenomenon obtained from optical
microscope is used to determine the critical load. Results show
it is easy the tensile crack occurs at the harder substrate or
thinner coating. On the other hand, it is easy the conformal
crack occurs at the softer substrate or thicker coating.
Moreover, both the tensile and conformal cracks appear at the
thicker coating of 6μm and 10μm on the SK3 and SKH51
specimen. The spalling area increases with increasing substrate
hardness and coating thickness. Moreover, the critical load
increases with increasing substrate hardness and coating
thickness, and decreasing scratch speed. The critical load
decreases with increasing substrate roughness for SK3
substrate, but the critical load increases not so obvious with
increasing substrate roughness. Since the substrate is not
showed on the spalling area during the spalling process, the
adhesion between VC and several substrates is better than that
of the cohesion between VC and VC coating. Furthermore, it also
found that the adhesion of VC coating on SKH51 is better than
that on SKD11, SK3 and S45C. Results also show that the
variation on the tangential friction force become more at the
harder substrate, the ticker coating, and faster scratch speed.
As a result, it is easily to determine the critical load. On
the contrary the measured tangential friction force with the
corresponding failure phenomenon obtained from optical
microscope must be used to determine the critical load for
softer substrate, thinner coating, and slower scratch speed.

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