Chemical Vapor Deposition of Highly Adherent Diamond Coatings onto Co-Cemented Tungsten Carbides Irradiated by High Power Diode Laser

被引:21
作者
Barletta, M. [1 ]
Rubino, G. [1 ]
Valle, R. [2 ]
Polini, R. [3 ]
机构
[1] Univ Roma Tor Vergata, Dipartimento Ingn Ind, I-00133 Rome, Italy
[2] Ctr Sviluppo Mat SpA, I-00128 Rome, Italy
[3] Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy
关键词
CVD; diamond; hard metal; chemical etching; substrate pretreatment; diode laser; SUBSTRATE SURFACE; IMPROVED ADHESION; FILM DEPOSITION; GROWTH; PRETREATMENTS; INTERLAYERS; NUCLEATION; HARDMETAL; HFCVD; CVD;
D O I
10.1021/am2012992
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The present investigation deals with the definition of new eco-friendly alternative to pretreat Co-cemented tungsten carbide (WC-Co) substrates before diamond deposition by hot filament chemical Vapor deposition (HFCVD). In particular, WC-5.8 wt %Co substrates were submitted to a thermal treatment by a continuous wave-high power diode laser to reduce surface Co concentration and promote the reconstruction of the WC grains. Laser pretreatments were performed both in N-2 and Ar atmosphere to prevent substrate oxidation. Diamond coatings were deposited onto the laser pretreated substrates by HFCVD. For comparative purpose, diamond coatings were also deposited on WC-5.8 wt %Co substrates chemically etched by the well two-step pretreatment employing Murakami's reagent and Caro's acid. Surface morphology, microstructure, and chemical composition of the WC-5.8 wt %Co substrates after the different pretreatments and the deposition of,diamond coatings were assessed by surface profiler, scanning electron. microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction analyses. Wear performance of the diamond coatings was checked by dry sliding linear reciprocating tribological tests. The worn volume of the diamond coatings deposited on the laser pretreated substrates was always found lower than the one measured on the chemically etched substrates, with the N2 atmosphere being particularly promising.
引用
收藏
页码:694 / 701
页数:8
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