Sealing Performance and Mechanism of a High-Temperature Near-Neutral Sealing Adhesive in the Ternary System of ZrO₂-Al₂O₃-SiO₂

Abstract:

A high-temperature sealing adhesive was prepared using kyanite, andalusite, and magnesia fully stabilized zirconia (Mg-FSZ) as raw materials and nanozirconia (ZrO₂) sol as binder. The adhesive is chemically near-neutral and suitable for bonding acid, neutral, or alkaline materials at 1560 °C. The mineral composition, volume expansion, and air permeability of multiple thermal cycles were analyzed. Results showed that the volume expansion caused by the mullitization of kyanite and andalusite can compensate for the sintering shrinkage high temperature. MgO could gradually desolvatize from the Mg-FSZ particles and react with SiO₂ and Al₂O₃ to produce a stable forsterite and magnesium aluminate spinel. Hence, Mg-FSZ became unstable, and cubic ZrO₂ transformed into monoclinic ZrO₂ when cooled, leading to a volume expansion of the adhesive, which ensured the sealing effect. A larger critical particle size of Mg-FSZ can provide the adhesive with a more persistent volume expansion during thermal cycles due to the more durable desolvatization of MgO. The nanoZrO₂ sol binder can improve the sintering of the adhesive and bonding of the joint, resulting in a low gas permeability.

• Periodical: Materials Science Forum (Volume 977)
• Pages: 65-71
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.977.65
• Online since: February 2020
• Authors: Li Biao Xiao, Dian Zhang*, Yi Jun Liu, Li Min Pan, Qun Hu Xue
• Keywords: High-Temperature Adhesive, Magnesia Fully Stabilized Zirconia, Phase Transformation, Sealing Performance

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