PRECIPITATION AND CHARACTERIZATION OF NANO ALUMINA SURFACE COATING FOR SURFACE TREATED PARTIALLY STABILIZED ZIRCONIA
Stino, S., Abdel-Hamid, D., Shoeib, M., Hashem, A. (2016). PRECIPITATION AND CHARACTERIZATION OF NANO ALUMINA SURFACE COATING FOR SURFACE TREATED PARTIALLY STABILIZED ZIRCONIA. EKB Journal Management System, 62(Issue 1 - January (Part 3)), 609-622. doi: 10.21608/edj.2016.95076
Sherine S. Stino; Dalia M. Abdel-Hamid; Madiha A. Shoeib; Azza A-Z. Hashem. "PRECIPITATION AND CHARACTERIZATION OF NANO ALUMINA SURFACE COATING FOR SURFACE TREATED PARTIALLY STABILIZED ZIRCONIA". EKB Journal Management System, 62, Issue 1 - January (Part 3), 2016, 609-622. doi: 10.21608/edj.2016.95076
Stino, S., Abdel-Hamid, D., Shoeib, M., Hashem, A. (2016). 'PRECIPITATION AND CHARACTERIZATION OF NANO ALUMINA SURFACE COATING FOR SURFACE TREATED PARTIALLY STABILIZED ZIRCONIA', EKB Journal Management System, 62(Issue 1 - January (Part 3)), pp. 609-622. doi: 10.21608/edj.2016.95076
Stino, S., Abdel-Hamid, D., Shoeib, M., Hashem, A. PRECIPITATION AND CHARACTERIZATION OF NANO ALUMINA SURFACE COATING FOR SURFACE TREATED PARTIALLY STABILIZED ZIRCONIA. EKB Journal Management System, 2016; 62(Issue 1 - January (Part 3)): 609-622. doi: 10.21608/edj.2016.95076

PRECIPITATION AND CHARACTERIZATION OF NANO ALUMINA SURFACE COATING FOR SURFACE TREATED PARTIALLY STABILIZED ZIRCONIA

Egyptian Dental Journal
Article 5, Volume 62, Issue 1 - January (Part 3), January 2016, Page 609-622  XML PDF (2.68 MB)
Document Type: Original Article
DOI: 10.21608/edj.2016.95076
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Authors
Sherine S. Stino1; Dalia M. Abdel-Hamid2; Madiha A. Shoeib3; Azza A-Z. Hashem4
1Demonstrator, Biomaterials Department, Faculty of Oral and Dental Medicine, Cairo University. Cairo, Egypt
2Associate Professor, Biomaterials Department, Faculty of Oral and Dental Medicine, Cairo University. Cairo, Egypt
3Professor, Chemistry & Technology of Ceramic, Coating, Surface Treatment and Corrosion Control Department, Central Metallurgical Research and Development Institute (CMRDI). Cairo, Egypt
4Professor, Biomaterials Department, Faculty of Oral and Dental Medicine, Cairo University. Cairo, Egypt
Abstract
This study aimed at developing a controlled method for the precipitation of nano-alumina coating on surface treated yttria partially stabilized tetragonal zirconia (Y-TZP). Thirty zirconia discs were prepared and divided into 2 main groups: Polished zirconia (I) and sulfuric acid treated zirconia surface (II). These were further subdivided into 3 subgroups (A, B, C) respectively: Control uncoated, surface coating with nano-structured alumina using aluminum nitride powder (AlN) as a reference method, and aluminum sulfate powder Al2(SO4)3  as an alternative aluminum ion source. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for specimen’s characterization. The XRD analysis revealed that IB, IIB exhibited wide peaks of nano-boehmite with peaks of unreacted AlN. After heat treatment, the lamellae transformed to nano-alumina. While IC, IIC groups revealed peaks of nano-boehmite only, transformed to nano-alumina by heat treatment. SEM of IB, IIB revealed bundles with nano-sized interlocked lamellae exhibiting large surface area. Groups IC, IIC had a leafy-like structure, randomly positioned nano-alumina crystals. Better retentive surface features were confirmed for IIB, IIC. It has been concluded that alumina precursors, pH, temperature and stirring time are sensitive parameters in the co-precipitation of nano-alumina on zirconia. Aluminum nitride precursor provides superior zirconia nano-alumina coating quality than aluminum sulfate. Sulfuric acid surface pre-treatment of zirconia improved the retentive quality of the nano-alumina coating.
Keywords
Zirconia; Nano-alumina; Sulfuric acid; Coating; Precipitation Characterization
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