Effects of chemical treatments on thermal expansion properties of cordierite ceramics

Bai Jiahai; Guo Lucun

doi:10.1007/BF02840892

Journal of Wuhan University of Technology Materials Science Edition ›› 2006, Vol. 21 ›› Issue (3) : 100 -102. DOI: 10.1007/BF02840892

Article

Effects of chemical treatments on thermal expansion properties of cordierite ceramics

Bai Jiahai ¹^,²
, Guo Lucun ¹^,^b

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Abstract

Cordierite honeycomb ceramics was treated with 1.5 M HNO₃, followed with 1.5 M NaOH at 93°C. The combination of acid treatment with alkali treatment significantly diminished the rebounding of coefficient of thermal expansion (CTE) caused by heat treatment, a phenomenon observed in samples treated solely with acid. Inductively coupled plasma (ICP) analysis results reveal that the alkali treatment preferentially dissolved “free” SiO₂ left in the acid-treated samples, which is considered to be a key factor responsible for the CTE rebounding.

Keywords

cordierite / alkali treatment / coefficient of thermal expansion (CTE)

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Bai Jiahai, Guo Lucun. Effects of chemical treatments on thermal expansion properties of cordierite ceramics. Journal of Wuhan University of Technology Materials Science Edition, 2006, 21(3): 100-102 DOI:10.1007/BF02840892

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