Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Some notes on the firing colour of clay bricks
AbstractThere is a close relationship between the occurrence of high-temperature crystalline phases and the colour of clay bricks after being fired under oxidizing conditions at 1000°C. Firing colours in various red shades expected on the basis of the relatively high Fe-content (3–7 wt. %) may fail to appear due to the incorporation of Fe in specific high-temperature crystalline phases rather than its occurrence as free iron oxide in the form of hematite.X-ray investigations show that these minerals could be one or the other of mullite or metakaolinite and a fassaitic pyroxene in which the iron is present in its trivalent form. Yellow and beige to light brown colours result in the formation of these minerals.Mullite or metakaolinite are formed from kaolinitic raw materials containing only little CaO and alkali oxides. Fassaitic pyroxene is formed from CaCO3-rich materials in which the CaCO3 is fine grained and homogeneously dispersed. If the conditions are not favourable to form these minerals the firing colour of the bricks will be in various shades of red due to fine grained, dispersed hematite.
Some notes on the firing colour of clay bricks
AbstractThere is a close relationship between the occurrence of high-temperature crystalline phases and the colour of clay bricks after being fired under oxidizing conditions at 1000°C. Firing colours in various red shades expected on the basis of the relatively high Fe-content (3–7 wt. %) may fail to appear due to the incorporation of Fe in specific high-temperature crystalline phases rather than its occurrence as free iron oxide in the form of hematite.X-ray investigations show that these minerals could be one or the other of mullite or metakaolinite and a fassaitic pyroxene in which the iron is present in its trivalent form. Yellow and beige to light brown colours result in the formation of these minerals.Mullite or metakaolinite are formed from kaolinitic raw materials containing only little CaO and alkali oxides. Fassaitic pyroxene is formed from CaCO3-rich materials in which the CaCO3 is fine grained and homogeneously dispersed. If the conditions are not favourable to form these minerals the firing colour of the bricks will be in various shades of red due to fine grained, dispersed hematite.
Some notes on the firing colour of clay bricks
Kreimeyer, Rolf (Autor:in)
Applied Clay Science ; 2 ; 175-183
18.12.1986
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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