Effect of chemical composition of silica sand on thermal dilatation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F23%3A10253890" target="_blank" >RIV/61989100:27360/23:10253890 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.37904/metal.2023.4682" target="_blank" >https://doi.org/10.37904/metal.2023.4682</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Effect of chemical composition of silica sand on thermal dilatation

Popis výsledku v původním jazyce

One of the factors influencing the surface quality of castings is the resulting thermal expansion when silica sands are used. This is characterised both by its high value compared to other non-silica sands, and by its typical discontinuous behaviour, leading in many cases to defects such as veining or increased surface roughness, which further lead to increased costs of processing the castings or, in extreme cases, to scrap pieces. The amount of thermal expansion of silica sand is influenced by various factors, including granulometric composition and chemical purity. It is the SiO2 content of the sand that contributes significantly to the degree of dilation, and which can vary depending on grain size alone. Two silica sand samples from the same locality of origin with different mean grain sizes were evaluated. The granulometric composition as well as the SiO2 and impurity content were evaluated by SEM analysis and XRFS and their effect on the linear thermal expansion. The effect of grain size on the final SiO2 content was observed, with sands of the same origin with larger grains containing 1.3% more SiO2 and achieving 36.8% higher dilatation. This combination increases the susceptibility of the sand, and hence the resulting moulding mixture, to the formation of foundry defects from braked stress as veining.

Název v anglickém jazyce

Effect of chemical composition of silica sand on thermal dilatation

Popis výsledku anglicky

One of the factors influencing the surface quality of castings is the resulting thermal expansion when silica sands are used. This is characterised both by its high value compared to other non-silica sands, and by its typical discontinuous behaviour, leading in many cases to defects such as veining or increased surface roughness, which further lead to increased costs of processing the castings or, in extreme cases, to scrap pieces. The amount of thermal expansion of silica sand is influenced by various factors, including granulometric composition and chemical purity. It is the SiO2 content of the sand that contributes significantly to the degree of dilation, and which can vary depending on grain size alone. Two silica sand samples from the same locality of origin with different mean grain sizes were evaluated. The granulometric composition as well as the SiO2 and impurity content were evaluated by SEM analysis and XRFS and their effect on the linear thermal expansion. The effect of grain size on the final SiO2 content was observed, with sands of the same origin with larger grains containing 1.3% more SiO2 and achieving 36.8% higher dilatation. This combination increases the susceptibility of the sand, and hence the resulting moulding mixture, to the formation of foundry defects from braked stress as veining.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20500 - Materials engineering

Projekt

<a href="/cs/project/EF17_049%2F0008399" target="_blank" >EF17_049/0008399: Rozvoj mezisektorové spolupráce RMTVC s aplikační sférou v oblasti výzkumu progresivních a inovací klasických kovových materiálů a technologií s využitím metod modelování</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

METAL 2023 : 32nd International Conference on Metallurgy and Materials : conference proceedings : May 17–19, 2023, OREA Congress Hotel Brno, Czech Republic, EU

ISBN

978-80-88365-12-9

ISSN

2694-9296

e-ISSN

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Počet stran výsledku

5

Strana od-do

84-88

Název nakladatele

Tanger

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

17. 5. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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