Bi-phase ceramic composite using an interpenetrating network

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• 作者：Eun-Hee Kim ; Je-Hyun Lee ; Yeon-Gil Jung ; ^{jungyg@changwon.ac.kr}
• 关键词：Composite ; Inorganic precursor ; Glassification ; Interpenetrating network (IPN) ; Porous ceramic ; Mechanical properties
• 刊名：Surface and Coatings Technology
• 出版年：2013
• 出版时间：25 January, 2013
• 年：2013
• 卷：215
• 期：Complete
• 页码：300-305
• 全文大小：1162 K

文摘

A secondary phase has been reinforced into a porous alumina (Al₂O₃) matrix using an interpenetrating network (IPN) method to enhance the mechanical properties of the porous matrix. To increase the addition effect of the secondary phase into the Al₂O₃ matrix, two types of SiO₂ precursor were used: tetraethylorthosilicate (TEOS) of the silicate type and polydimethylsiloxane (PDMS) of the siloxane type. The PDMS does not undergo a sol-gel reaction, whereas the TEOS is converted into glass-phase SiO₂ by a sol-gel reaction. This means that the siloxane type has a higher conversion ratio of precursor into the glass phase of SiO₂ than does the silicate type. The mechanical properties of the composites prepared using TEOS and PDMS without sodium methoxide (NaOMe) have been improved, showing 12.9 ¡À 5.9 and 9.9 ¡À 6.4 MPa in fracture strength, respectively, and 17.2 ¡À 4.6 and 15.5 ¡À 6.9 GPa in elastic modulus, respectively, while the mechanical properties of the porous Al₂O₃ matrix were 6.0 ¡À 1.2 MPa and 8.0 ¡À 4.0 GPa in fracture strength and elastic modulus, respectively. However, the mechanical properties of the composite prepared using PDMS with NaOMe were higher than those of the composite prepared using TEOS with NaOMe, showing 25.3 ¡À 7.3 MPa and 26.3 ¡À 5.5 GPa in fracture strength and elastic modulus, respectively. The increase in mechanical properties was caused by the enhancement of glassification owing to the high conversion ratio of the SiO₂ precursor, in the absence of a sol-gel reaction. Consequently, bi-phase composites with reasonable properties have been successfully prepared through the IPN method using inorganic precursors.