Facile preparation of BN coatings on graphite substrates and their binding strength |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China;2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China;3. Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081, China;4. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China |
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| Abstract: | To decrease the curing temperature and achieve excellent binding strength of BN coatings on graphite substrates, a proper Al(H2PO4)3 binder has been carefully designed where MgAl2O4 and poly vinyl alcohol (PVA) were used as the curing agent and the dispersant, respectively. XRD, SEM, TEM and DSC showed that the desired binding phase AlPO4 had been successfully obtained, where MgAl2O4 and PVA worked synergistically to lower the curing temperature down to 70–100 °C and promote the formation of AlPO4. Such optimized binder might have formed hydrogen bond with –NH2 and –OH groups on the BN flakes. It might also form hydrogen bond with-OH and –COOH groups on graphite substrates to ensure an optimal binding strength of 5.5 N (～22 MPa) as suggested by the scratch tests. This work affords a better understanding on the curing chemistry of Al(H2PO4)3 and the binding mechanism between BN flakes, AlPO4 binding phases and graphite substrates. |
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| Keywords: | Curing reaction BN coatings Binding strength |
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