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 lh before and after wetting were characterized by XRD. The microstructure at metal/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 interracial regions. The results reveal that reactive wetting takes place in the system in high temperature wetting procedure, which is controlled by diffusion and dissolution mechanism. Results also show that the contact angles decrease with various carbides aditions, including 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 additions 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.
参考文献
| [1] | P Ettmayer .Hardmetals and Cermets[J].Anu Rev Mater Sci,1989,19:145-164. |
| [2] | P. ETTMAYER;H. KOLASKA;W. LENGAUER .Ti(C,N) Cermets -Metallurgy and Properties[J].International Journal of Refractory Metals & Hard Materials,1995(6):343-351. |
| [3] | M Qian;L C Lim .Microstructural Evolution in the Phase Mixtures of Ti(C,N)-Mo at 1600 degree[J].Mater Sci Eng,1999,A264:39-46. |
| [4] | Ahn S.Y.;Kang S. .Formation of Core/Rim Structures in Ti(C, N)-WC-Ni Cermets via a Dissolution and Precipitation Process[J].Journal of the American Ceramic Society,2000(6):1489-1494. |
| [5] | M Humenik;N M Jr Parikh .Cermets: Ⅰ ,Fundamental Concepts Related to Microstructure and Physical Properties of Cermets Systems[J].J Am Ceram Soc,1956,39:60-63. |
| [6] | N M Parikh;M Jr Humenik .Cermets: Ⅱ , Wettability and Microstructure Studies in Liquid Phase Sintering[J].J Am Ceram Soc,1957,40:315-320. |
| [7] | Jong-Ku Park;Seung-Tae Park .Densification of TiN-Ni cermets by improving wettability of liquid nickel on TiN grain surface with addition of Mo2C[J].International Journal of Refractory Metals & Hard Materials,1999(4):295-298. |
| [8] | H W Liu;K H Chen;H B Lü .Wettability of Ti (C, N)-based Cermets[J].Powder Metallurgy Technology,2000,18:167-171. |
| [9] | M H Chen.The Relationship between the Wettability and the Valence Electron Structure of Ceramic Phase in Ti ( C, N )Based Cermets [ Master Thesis ][M].合肥:安徽科学技术出版社,2003 |
| [10] | F Delannay;L Froyen;A Deruyttere .The Wetting of Solid by Molten Metals and Its Relation to Preparation of Metal-matrix Composites[J].J Mater Sci,1987,22:1-16. |
| [11] | N.Eustathopoulos .Dynamics of wetting in reactive metal/ ceramic systems[J].Acta materialia,1998(7):2139-2327. |
| [12] | R J Li.Ceramics-Metal Composites[M].北京:冶金工业出版社,2002:231-252. |
| [13] | Olivier Dezellus;Fiqiri Hodaj;Andreas Mortensen .DIFFUSION-LIMITED REACTIVE WETTING: SPREADING OF Cu-Sn-Ti ALLOYS ON VITREOUS CARBON[J].Scripta materialia,2001(11):2543-2549. |
| [14] | R. VOITOVITCH;A. MORTENSEN;F. HODAJ .DIFFUSION-LIMITED REACTIVE WETTING: STUDY OF SPREADING KINETICS OF Cu-Cr ALLOYS ON CARBON SUBSTRATES[J].Acta materialia,1999(4):1117-1128. |
| [15] | S. Ahn;S. Kang .Effect of various carbides on the dissolution behavior of Ti(C_(0.7)N_(0.3)) in a Ti(C_(0.7)N_(0.3))-30Ni system[J].International Journal of Refractory Metals & Hard Materials,2001(4/6):539-545. |
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