National University of Science and Technology “MISIS” (MISIS), Moscow, Russia:

O. S. Manakova, Post-Graduate Student, e-mail: manakova_ol@mail.ru
E. A. Levashov, Head of a Chair
V. V. Kurbatkina, Assistant Professor

In this paper we studied the effect of metal binder on the structure and properties of dispersion-hardening composite of Ti – Zr – C, obtained by the technology of SHS-compaction. The effect on the phase composition of the synthesis products had the content and composition of the binder and the concentration of Zr in the reaction mixture. At a concentration of less than 12% Zr two phases were revealed: (Ti,Zr)C and the intermetallide. At Zr more than 12%, along with binder two phases (Ti,Zr)C and (Zr,Ti)C were formed. The composition of binder depended on its amount in the mixture. When the content of binder is 5% its composition was described by the formula (Ni,Co)(Ti,Zr)₂, which corresponds to the solid solution based on the Laves phase NiTi2, and at 20–30% of the binder — the compound Ti(Ni,Co). After annealing of SHS-products in a vacuum at 900 ^оC within 4 h number of carbide phases decreased and the intermetallic phases increased in all samples. After heat treatment in samples with more than 23% Zr phase composition of the binder varied: in addition to Ti(Ni,Co) nano-sized precipitation of excess Laves phase ZrCo₂ was observed. In order to study the stages of processes of phase and structure formation of dispersion-hardening material in the system Ti – Zr – C - binder in the combustion wave, experiments on the combustion wave quenching in a copper wedge by the stopped combustion front (SCF) were conducted. The results of experiments on the composition and structure of typical FGD areas, as well as XRD of synthesized and annealed samples had suggested a sequence of stages of structure formation (staging) in the synthesis of dispersion-hardening ceramic material Ti – Zr — C + binder. Introduction of low melting binder components to the reaction mixture, that make up the melt in the combustion zone, was resulted in a significant reduction in the residual porosity of the compact SHS-products 11.0 to 1.3% and increased mechanical properties.

1. Levashov E. A., Rogachev A. S., Kurbatkina V. V., Maksimov Yu. M., Yukhvid V. I. Perspektivnye materialy i tekhnologii samorasprostranyayushchegosya vysokotemperaturnogo sinteza (Prospective materials and technologies of self propagating high temperature synthesis). Moscow : MISiS, 2011.
2. Levashov E. A., Shtansky D. V., Lobov A. L., Borovinskaya I. P. Structure and Properties of a New Disperse-Hardening Alloy Based on Titanium Carbide obtained by the SHS Method. International journal of Self-propagating high-temperature synthesis (SHS). 1994. Vol. 2, No. 2. p. 165.
3. Levashov E. A., Shtanskiy D. V., Lobov A. L., Bogatov Yu. V., Merzhanov A. G. Fizika metallov i metallovedenie – The Physics of Metals and Metallography. 1994. Vol. 77, Iss. 2. pp. 118–124.
4. LaSalvia J. C., Kim D. K., Meyers M. A. Journal of Materials Science and Engineering. 1996. Vol. 206 A. p. 71.
5. Levashov E. A., Vyushkov B. V., Egorychev K. N., Borovinskaya I. P. Technological Aspects of Manufacturing New Synthetic Titanium and Molybdenum Carbide-based Tool Materials. International journal of Self-propagating high-temperature synthesis (SHS). 1996. Vol. 5, No. 3. p. 293.
6. Levashov E. A., Shtanskiy D. V., Vyushkov B. V., Shtanskaya E. V. Fizika metallov i metallovedenie – The Physics of Metals and Metallography. 1994. Vol. 78, No. 4. p. 147.
7. Kurbatkina V. V., Levashov E. A., Podgornyy D. A. Tsvetnye Metally – Non-ferrous metals. 2006. No. 2. pp. 61–64.
8. Levashov E. A., Kurbatkina V. V., Zaytsev A. A., Rupasov S. I., Patsera E. I., Zubavichus Ya. V., Veligzhanin A. A. Fizika metallov i metallovedenie – The Physics of Metals and Metallography. 2010. Vol. 109, No. 1. pp. 102–112.
9. Moskowitz D., Humenic M. International Journal of Powder Metallurgy and Powder Technology. 1976. Vol. 23. pp. 224– 229.
10. Moskowitz D., Humenic M. Modern Development in Powder Metallurgy. Princeton, 1981. Vol. 14. pp. 307–320.
11. Khollek Kh. Dvoynye i troynye karbidnye i nitridnye sistemy perekhodnykh metallov : spravochnik (Double and triple carbide and nitride systems of transition metals : reference book). Moscow : Metallurgiya, 1988.