Wszystkie pola: rapid crystallization - Katalog OPAC zbiorów

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Tytuł:: Cu-Zn slags from Røros (Norway): a case study of rapid cooling and crystal nucleation
Autorzy:: Warchulski, R.
Szopa, K.
Powiązania:: https://bibliotekanauki.pl/articles/100755.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Śląski. Wydział Nauk o Ziemi
Tematy:: Røros
żużel
krystalizacja
chłodzenie
slags
olivine
clinopyroxene
crystallization
Opis:: The mining town of Røros located in central Norway was established in 1644 and it is known of historical mining industry related to copper. Røros was designated as an UNESCO World Heritage Site in 1980 on the base of mining culture represented by, e.g., unique wooden architecture. Slag pieces are composed of three parts differing in glass to crystallites ratio. Røros slags are composed of olivine- and pyroxene- group minerals accompanied by sulphides, with glass in the interstices. Temperature gradient and volatiles content were determined as the main factor influencing crystallization process in this material.
Źródło:: Contemporary Trends in Geoscience; 2014, 3, 1; 68-75
2299-8179
Pojawia się w:: Contemporary Trends in Geoscience
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Meta-stable solidification created by the detonation method of coating formation
Autorzy:: Wołczyński, W.
Garzeł, G.
Morgiel, J.
Senderowski, C.
Pawłowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/382812.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: krystalizacja
krzepnięcie szybkie
powłoka Fe-Al
faza amorficzna
theory of crystallization
rapid solidification process
Fe-Al coating
meta-stable phase diagram
amorphous phase
Opis:: Particles of the Fe-Al type (less than 50 m in diameter) were sprayed onto the 045 steel substrate by means of the detonation method. The TEM, SAED and EDX analyses revealed that the Fe-Al particles have been partially melted in the experiment of coating formation. Particle undergone melting even within about 80% of its volume. Therefore, solidification of the melted part of particles was expected. Solidification differed significantly due to a large range of chemical composition of applied particles (from 15 at.% Al up to 63 at.% Al). A single particle containing 63 at.% Al was subjected to the detailed analysis, only. The TEM / SAED techniques revealed in the solidified part of particle three sub-layers: an amorphous phase, [...] , periodically situated FeAl + Fe2Al5 phases, and a non-equilibrium phase, [...]. A hypothesis dealing with the inter-metallic phases formation in such a single particle of the nominal composition No = 0.63 is presented. At first, the solid / liquid system is treated as an interconnection: substrate / liquid / nonmelted particle part . Therefore, it is suggested that the solidification occurs simultaneously in two directions: towards a substrate and towards a non-melted part of particle. The solidification mechanism is referred to the Fe-Al meta-stable phase diagram. It is shown that the melted part of particle solidifies rapidly according to the phase diagram of meta-stable equilibrium and at a significant deviation from the thermodynamic equilibrium.
Źródło:: Archives of Foundry Engineering; 2012, 12, 2; 93-96
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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