Naslov
The Influence of Heat-Resistant Ceramic Coatings on Mechanical Properties of Niobium Alloys.

Autori
Bukhanovskii, V. ; Mamuzić, I. ; Borysenko, V. ; Kharchenko, V.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Materials and Metallurgy, Summaries of Lectures / Mamuzić, Ilija - Zagreb : Hrvatsko metalurško društvo, 2004

Skup
6. Međunarodni simpozij Hrvatskog metalurškog društva, SHMD 2004, Materijali i metalurgija

Mjesto i datum
Šibenik, Hrvatska, 20.07.2004. - 24.07.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
mechanical properties; niobium alloys

Sažetak
The strength, deformability, and load-carrying capacity of niobium alloys of the Nb-W-Mo-Zr and Nb-Mo-Zr-C systems both in the initial state and with ceramic slip coatings based on molybdenum and hafnium silicides have been studied under conditions of short-term and long-term static tension in vacuum, inert medium, and in air in the temperature range from 290 to 2070 K. The investigation of the damage accumulated in the niobium alloy/silicide-ceramic coating composites under conditions of high-temperature tension revealed that cracks in the coating initiate already at early stages of plastic deformation (up to 0, 5 %). As a result of the investigation of creep and long-term strength of the composites, the values of the limits of 0, 5 % and 1, 0 % creep were obtained at temperatures of 1770 and 2070 K for the test time of 0, 1 ; 1, 0 and 10 hours. For instance, the creep stress of the niobium alloy of the Nb-W-Mo-Zr/silicide-ceramic coating composite inducing strains of 0, 5 % within the test time of 1 hour in argon is 25 MPa at 1770 K and 8 MPa at 2020 K. In air, the above values are higher accounting for 30 MPa at 1770 K and 10 MPa at 2020 K.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

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