摘要
The wettability in Ni / Ti （ C, N ） systems with various carbides additions was investigated by the sessile drop technique. The substrates prepared by HP at 2073 K for 1 h before and after wetting were characterized by XRD . The microstructure ca metall ceramics interfaces was observed via SEM in a back scattered mode. Furthermore , an X-ray energy-dispersive spectrometer （ EDS ） attached to SEM was used to study the element diffusion in interfacial regions. The resalts reveal that reactive wetting takes place in the system in high tempercature wetting procedure , which is controlled by diffusion and dissolution mechanism. Results also show that the contact angles decrease with various carbides additions, iuelnding WC , Mo2 C, TaC , NbC and VC , and decrease continuously with the increasing of additions. The order of the contact angles in Ni/Ti （ C, N ） systems with 10 wt% carbides acMitions is Mo2 C 〈 TaC 〈 WC 〈 VC 〈 NbC. The enhancement of the wettability is due to an alloying procedure during high temperature wetting when metallic atoms diffuse into Ni phase, which decreases the interfacial energy of Ni/ Ti （ C, N） systems.
The wettability in Ni / Ti （ C, N ） systems with various carbides additions was investigated by the sessile drop technique. The substrates prepared by HP at 2073 K for 1 h before and after wetting were characterized by XRD . The microstructure ca metall ceramics interfaces was observed via SEM in a back scattered mode. Furthermore , an X-ray energy-dispersive spectrometer （ EDS ） attached to SEM was used to study the element diffusion in interfacial regions. The resalts reveal that reactive wetting takes place in the system in high tempercature wetting procedure , which is controlled by diffusion and dissolution mechanism. Results also show that the contact angles decrease with various carbides additions, iuelnding WC , Mo2 C, TaC , NbC and VC , and decrease continuously with the increasing of additions. The order of the contact angles in Ni/Ti （ C, N ） systems with 10 wt% carbides acMitions is Mo2 C 〈 TaC 〈 WC 〈 VC 〈 NbC. The enhancement of the wettability is due to an alloying procedure during high temperature wetting when metallic atoms diffuse into Ni phase, which decreases the interfacial energy of Ni/ Ti （ C, N） systems.
基金
FinanciallysupportedbytheNationalNaturalScienceFoundationofChina,theNaturalScienceFoundationofAnhuiProvinceandtheProjectofKeyTeachersofUniversityofMinistryEducationofChina(No.50072003,No.03044902andNo.GG-805-10359-1840)
