@Article{MartinsDVPRTVBC:2021:LaClVa,
               author = "Martins, Romulo L. and Damm, D. D. and Volu, R. M. and Pinheiro, 
                         Rom{\'a}rio Ara{\'u}jo and Rosa, Filipe Menezes and 
                         Trava-Airoldi, Vladimir Jesus and Vasconcelos, Get{\'u}lio de and 
                         Barquete, Danilo M. and Corat, Evaldo Jos{\'e}",
          affiliation = "{Universidade Estadual de Santa Cruz (UESC)} and {Universidade 
                         Federal do Rec{\^o}ncavo da Bahia (UFRB)} and {Instituto de 
                         Estudos Avan{\c{c}}ados (IEAv)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto de Estudos Avan{\c{c}}ados (IEAv)} and 
                         {Universidade Estadual de Santa Cruz (UESC)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Laser cladding of vanadium carbide interlayer for CVD diamond 
                         growth on steel substrate",
              journal = "Surface and Coatings Technology",
                 year = "2021",
               volume = "421",
                pages = "e127387",
                month = "Sept.",
             keywords = "CVD diamond, Diffusional barrier, Interlayer, Laser cladding, 
                         Vanadium carbide.",
             abstract = "The chemical vapor deposition of diamond film on steel substrate 
                         remains with main drawbacks demanding a proper solution. Some 
                         proposed interlayers tackled with the high carbon diffusivity into 
                         steel and with the graphitic sp2 bonds catalyzed by transition 
                         metal. However, the large mismatch of the coefficient of thermal 
                         expansion between steel and diamond produces cracked and 
                         delaminated diamond films. Thermodiffused vanadium carbide (TDVC) 
                         interlayer for straight CVD diamond deposition on steel, showed 
                         disruptive results; nevertheless, the coating thickening is 
                         limited to substrate with high carbon content and low alloy steel. 
                         This work introduces the use of laser cladding (LC) to form an 
                         intermediate layer of vanadium carbide (VC) from V4C3 powder. The 
                         LC process has a short cycle time and a high VC growth rate (5.6 
                         \μm/min). Comparing with TDVC, it represents a reduction of 
                         approximately 26 times in the process cycle time. We used AISI D6 
                         steel as substrate and overlapped VC layers to raise the coat 
                         thickness up to 25 \μm. The layers showed good adherence, 
                         low porosity, and the formation of V8C7 phase. Diamond films 2.8 
                         \μm thick were deposited by hot filament chemical vapor 
                         deposition (HFCVD) at 700 °C. The Raman spectroscopy of the 
                         diamond film on four overlapped VC layers (25 \μm thick) 
                         showed a compressive residual stress of 2.7 GPa. The residual 
                         stress reduction was 1.8 GPa, when compared with the 7 \μm 
                         thick single cladded VC layer.",
                  doi = "10.1016/j.surfcoat.2021.127387",
                  url = "http://dx.doi.org/10.1016/j.surfcoat.2021.127387",
                 issn = "0257-8972",
             language = "en",
           targetfile = "martins_laser.pdf",
        urlaccessdate = "27 abr. 2024"
}