Wyniki wyszukiwania - BazTech

1

Stopowanie żeliwa, staliwa i stali molibdenem dodawanym w postaci granul MoO3 z dodatkiem reduktora

Małecki S., Jarosz P., Malinowski C., Żaba K.

Rudy i Metale Nieżelazne

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2010

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R. 55, nr 10

686-689

PL

W artykule zaprezentowano wyniki badań nad wprowadzaniem molibdenu do stopów na osnowie żelaza. Molibden wprowadzano w postaci granul zawierających tlenek molibdenu i reduktor. W charakterze reduktorów stosowano żelazokrzem FeSi75 oraz silumin AlSi11. Uzyskano wysokie stopnie przechodzenia molibdenu do stopów bez istotnych zmian zawartości pozostałych składników. Skuteczność metody potwierdzono na próbkach o masie do 10 kg w warunkach laboratoryjnych.

EN

In this work, the results of alloying molybdenum to iron based alloys were presented. Molybdenum was alloyed as MoO3 granules with reducer. As reducers, ferrosilicon FeSi75 and silumin AlSi11 were used. High transition degrees of molybdenum without considerable changes of chemical composition of iron based alloys were obtained. The efficiency of the presented method was confirmed on a 10 kg samples in the laboratory.

2

Analiza stabilności składu chemicznego żeliwa po stopowaniu molibdenem wprowadzanym w postaci trójtlenku

Jarosz P., Małecki S., Nowak S., Żaba K.

Rudy i Metale Nieżelazne

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2010

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R. 55, nr 10

689-692

PL

W artykule przedstawiono wyniki analizy zmienności zawartości molibdenu, krzemu, węgla i aluminium w wybranych wyrobach z żeliwa po wprowadzeniu molibdenu w postaci trójtlenku. Analiza dotyczy prób przemysłowych. Wybór pierwiastków i analiza są ukierunkowane na opracowanie wytycznych do sterowania procesem oraz na oszacowanie ryzyka niezgodności.

EN

In the article there have been presented the results of analysis of changeability in the content of molybdenum, silicon, carbon and aluminum in the chosen cast iron products after alloying molybdenum in the form of trioxide. This analysis was made for industrial process. The choice of elements and analysis have been directed towards drawing up the guidelines for controlling the process and estimating the risk of incompatibility.

3

EPR and quantum chemical studies on structural changes in MoO3 upon reduction

Brocławik E., Łabanowska M., Jurkiewicz A.

Bulletin of the Polish Academy of Sciences. Chemistry

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2002

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Vol. 50, No. 3

359-371

EN

On the basis of EPR signals registered during reduction of MoO(3) a sequence of structural changes leading to creation of paramagnetic centres has been proposed. Electronic and geometrical structures obtained from quantum chemical calculations for cluster models describing creation of various oxygen vacancies were compared with EPR interpretation of the studied paramagnetic species. Thanks to good agreement between experimental and theoretical results it was possible to verify the nature of paramagnetic sites in reduced MoO(3).

4

Quantum chemical verification of new paramagnetic Mo(V) centre in MnO3

Brocławik E., Łabanowska M.

Bulletin of the Polish Academy of Sciences. Chemistry

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2000

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Vol. 48, No. 4

303-311

EN

The aim of our work was independent verification of the proposed from EPR experiment uncommon nature of paramagnetic Mo(V) species lacking molybdenyl oxygene For this purpose quantum chemical DFT calculations have been carried out for [MoO(5)H8](3+) cluster model of reduced MOO3. Good agreement between the energy level diagram elucidated from EPR data with calculated orbital energies led to the conclusion that the structure of this Mo(V) centre seems to be well founded.