Effect of nickel boride additive on simultaneous densification and phase decomposition of TiB2-WB2 solid solutions by pressureless sintering using induction heating

• Published in: Journal of the European Ceramic Society Vol. 27; no. 1; pp. 301 - 306
• Main Authors: SHIBUYA, M, OHYANAGI, M
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier 2007
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Cermets, ceramic and refractory composites; Chemical industry and chemicals; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Miscellaneous; Other materials; Physics; Specific materials; Technical ceramics; Ceramic matrix composite; Scanning electron microscopy; TiB2; Densification; Composite; Nickel boride; WB2; Mechanical properties; Vacuum sintering; Experimental study; Solid solution; X ray diffraction; Composite material; Induction heating; Non oxide ceramics; Phase decomposition; Additive; Borides; Titanium boride; Sintering; Technical ceramics; Manufacturing; Tungsten boride; Microstructure
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2006.05.081

A rapid process of simultaneous densification and phase decomposition of TiB2-WB2 solid solutions by pressureless sintering using induction heating was investigated. The products were obtained by sintering of mixture powder compacts of (Ti,W)B2 with nickel and boron (Ni/B = 3/1) varying between 0 and 7.5 wt%. The presence of nickel boride as an additive enhanced the kinetics of the subsequent densification and decomposition from the (Ti,W)B2 single phase to the two phases of (Ti,W)B2 and (W,Ti)B2. The sintered products were evaluated using XRD, SEM, and EDS analysis. For an addition of 7.5 wt%, the product with a relative density of 91% was produced by induction heating for only 600 s. The mechanical properties of the product, which were improved by densification and decomposition of (Ti,W)B2, are also presented. 24 refs.