Plasma Enhanced Cylindrical Magnetron Sputter (PECMs) Deposition of TiSiCN and TiAlVSiCN Coatings on Inner Surface of Cylinders
(Room Room 104-B)
29 Apr 19
11:40 AM
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12:00 PM
Tracks:
Protective, Tribological and Decorative Coatings
Plasma Enhanced Cylindrical Magnetron Sputtering (PECMS) has been used to deposit TiSiCN and TiAlVSiCN coatings on the inner surface of plunger valve expanders via sputtering a tubular target of either pure Ti or Ti-6Al-4V in a gas mixture of Ar+N2+TMS (trimethylsilane). The coatings were initially deposited on stainless steel coupons that were mounted on the inner surface of carbon steel tubes to simulate the expander made of tungsten carbide (WC). After the depositions, the coated coupons were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), nano-indentation, and RC indentation for coating thickness, morphology, microstructure, hardness and adhesion. Then the coupons were erosion tested using 50 µm alumina at the incident angles of 30° and 90°. The microstructural analyses indicate that the coatings have a nanocomposite structure consisting of nanocrystalline Ti(AlV)CN in a matrix of amorphous Si-C-N. These coatings have a hardness of 20-30 GPa and exhibit excellent erosion resistance. Based on the test results, two actual WC valve expanders were deposited with TiSiCN and TiAlVSiCN that will be tested in actual service. In this paper, we will discuss the design and characteristics of the cylindrical magnetron, the microstructural analyses of the coatings and their erosion resistance.