Experimental study of the Hf-Si-B system

• Grant number: 07/05206-5
• Support Opportunities: Regular Research Grants
• Start date: November 01, 2007
• End date: October 31, 2009
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Carlos Angelo Nunes
• Grantee: Carlos Angelo Nunes
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil
• City of the host institution: Lorena

Abstract

Currently, only the Ni-base superalloys of last generation can work under load at temperatures near 1150°C. Recent evaluation indicates that this temperature limit can not be surpassed for the superalloys, however, there is a demand for materials which can withstand higher temperatures. The technical data in the literature shows that multiphase materials present the largest potential for these applications. Among them, those involving intermetallic phases in equilibrium with a refractory metal or alloy were chosen for the initial evaluations.In this way, we have carried out investigations with Me-Si-B systems and an important set of data has already been obtained for the Mo-Si-B, Nb-Si-B, V-Si-B, Ta-Si-B, Ti-Si-B, Cr-Si-B and Zr-Si-B in terms of phase stability. In this work we plan to investigate the Hf-Si-B system in the Hf-rich region through the determination of isothermal sections at 1700°C and 1300°C and the liquidus projection. It is important to mention that information related to phase stability in this system are very limited in the literature. (AU)

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

JANIO GIGOLOTTI, JOAO CARLOS; SUZUKI, PAULO ATSUSHI; NUNES, CARLOS ANGELO; COELHO, GILBERTO CARVALHO. Microstructural Characterization of As-cast Hf-B Alloys. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 15, n. 2, p. 185-190, MAR-APR 2012. (07/05206-5)

JOÃO CARLOS JÂNIO GIGOLOTTI; PAULO ATSUSHI SUZUKI; CARLOS ANGELO NUNES; GILBERTO CARVALHO COELHO. Microstructural characterization of as-cast hf-b alloys. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 15, n. 2, p. 185-190, 2012-02-14. (07/05206-5)

CANDIOTO, K. C. G.; NUNES, C. A.; COELHO, G. C.; SUZUKI, P. A.; GABRIEL, S. B.. Rapid solidification and phase stability evaluation of Ti-Si-B alloys. Journal of Alloys and Compounds, v. 509, n. 17, p. 5263-5268, APR 28 2011. (07/05206-5)

GIGOLOTTI, J. C. J.; NUNES, C. A.; SUZUKI, P. A.; COELHO, G. C.. Evaluation of Phase Equilibria Involving the Liquid Phase in the Hf-Si System. JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION, v. 35, n. 5, p. 622-630, OCT 2014. (07/05206-5)

JANIO GIGOLOTTI, JOAO CARLOS; SUZUKI, PAULO ATSUSHI; NUNES, CARLOS ANGELO; COELHO, GILBERTO CARVALHO. Microstructural Characterization of As-cast Hf-B Alloys. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 15, n. 2, p. 6-pg., 2012-03-01. (07/05206-5)