文档介绍：Surface and Coatings Technology 114 (1999) 156–168
Adhesion measurement of zirconium nitride and amorphous silicon
carbide coatings to nickel and titanium alloys
. Gruss *, . Davis 1
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7907, USA
Received 22 March 1998; received in revised form 11 January 1999; accepted 26 January 1999
Abstract
Polycrystalline ZrN and amorphous coatings were deposited by cathodic arc evaporation and by plasma-assisted
chemical vapor deposition (PACVD) respectively on Incoloy 825 (Inc. 825), Hastelloy C22 (Hast. C22) and Titanium Grade 12
(Ti. 12) substrates. Scratch tests were employed to assess the critical load for interfacial failure and fracture mechanisms for the
various coating systems. Critical loads, characterized by continuous delamination of the coating, occurred at N, N and
N for ZrN deposited on Hast. C22, Inc. 825 and Ti. 12 respectively. Interfacial failure of the -coated metallic
substrates was dominated by brittle fracture of the coating. Critical loads of N, N and N were obtained for
deposited on Inc. 825, Hast. C22 and Ti. 12 respectively. Work of adhesion values were calculated from two well-known
models, namely the Bull–Rickerby and Laugier models, and from a model that incorporates elastic–plastic indentation. The
ranking of the adhesion for the coating–metal binations is (from best to worst): ZrN–Inc. 825, ZrN–Hast. C22,
ZrN–Ti, –Ti, –Hast. C22 and –Inc. 825. © 1999 Published by Elsevier Science . All rights reserved.
Keywords: Adhesion measurement; Amorphous silicon carbide; Coatings; Fracture mechanisms; Nickel alloys; Scratch test; Titanium alloys;
Zirconium nitride; Work of adhesion
1. Introduction of thermionic energy converters against the high heat
found bustion atmospheres [4]. Because of its
Zirconium nitride (ZrN)