Characterization of DC magnetron sputtered diamond-like carbon (DLC) nano coating
Development in vapor deposition techniques over the last two decades has led to the introduction of many advanced coatings for metal-cutting tools. This paper examines the characteristics of multilayer Ti, TiN, and diamond-like carbon (DLC) coatings deposited on standard tool substrates at varying sputtering parameters and conditions, such as power density, partial pressure, substrate temperature, and reactive gases. The characteristics of films were examined using an X-ray diffractometer, Raman microscope, surface profilometer (to measure the thickness of the coating), Rockwell hardness tester (to test adhesion), and a micro hardness tester. The pin-on-disc test setup was used to find the coefficient of friction of the coatings. The results indicated that a graded multilayer coating showed better adhesion to the substrates. It was observed that higher target power density resulted in an increase of micro hardness and crystalline planes of coating. Lattice constant matching among layers of coating, proper substrate preparation, and a sequence of cleaning processes are the crucial factors for the enhancement of adhesion strength.
KeywordsSurface coating DLC Adhesion Micro hardness
Unable to display preview. Download preview PDF.
- 13.ASM International (1994) ASM metals handbook, vol. 5: surface engineering. ASM International, Metals Park, OhioGoogle Scholar
- 21.Colton E (1996) Tougher coatings: a review of techniques and materials used to produce more durable films. CERAC Inc., Coating Material News Bulletin, vol 6, issue 2, April–June 1996Google Scholar
- 23.Tsuchiyama A, Shima Y, Hasuyama H (2002) Adhesive strength of DLC films prepared by ionization deposition. Surf Treatment 5:41–49Google Scholar
- 30.Bhusan B (2005) Modern tribology handbook, vol 2. Delta CRC Press, Boca Raton, FloridaGoogle Scholar
- 31.Gefi M, Botempi E (2003) A new X-ray method for residual stress evaluation in coatings. Surf Treatment VI:317–331Google Scholar
- 35.Loffler F (2003) Thin film characterization methods. Physikalisch Technische Bundeseantalt Germany Surface Treatment VI:225–244Google Scholar