Effect of coating thickness on the properties of TiN coatings deposited on tool steels using cathodic arc PVD technique

被引:28
作者
Mubarak, A. [1 ]
Akhter, Parvez [1 ]
Hamzah, Esah [2 ]
Toff, Mohd Radzi H. J. Mohd [3 ]
Qazi, Ishtiaq A. [4 ]
机构
[1] PCRET, Islamabad, Pakistan
[2] Univ Teknol Malaysia, Fac Mech Engn, Dept Mat Engn, Skudai 81310, Johor, Malaysia
[3] SIRIM Berhad, Adv Mat Res Ctr, Kulim 09000, Kedah, Malaysia
[4] Natl Univ Sci & Technol, Rawalpindi, Pakistan
关键词
morphology; surface roughness; coefficient of friction; hardness; adhesion;
D O I
10.1142/S0218625X08011524
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Titanium nitride (TiN) widely used as hard coating material, was coated on tool steels, namely on high-speed steel (HSS) and D2 tool steel by physical vapor deposition method. The study concentrated on cathodic arc physical vapor deposition (CAPVD), a technique used for the deposition of hard coatings for tooling applications, and which has many advantages. The main drawback of this technique, however, is the formation of macrodroplets (MDs) during deposition, resulting in films with rougher morphology. Various standard characterization techniques and equipment, such as electron microscopy, atomic force microscopy, hardness testing machine, scratch tester, and pin-on-disc machine, were used to analyze and quantify the following properties and parameters: surface morphology, thickness, hardness, adhesion, and coefficient of friction (COF) of the deposited coatings. Surface morphology revealed that the MDs produced during the etching stage, protruded through the TiN film, resulting in film with deteriorated surface features. Both coating thickness and indentation loads influenced the hardness of the deposited coatings. The coatings deposited on HSS exhibit better adhesion compared to those on D2 tool steel. Standard deviation indicates that the coating deposited with thickness around 6.7 mu m showed the most stable trend of COF versus sliding distance.
引用
收藏
页码:401 / 410
页数:10
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