scholarly journals Osseointegration of Cylindrical Zirconia–Alumina Functionally Graded materials, Dental implant by Electrophoretic Deposition

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Awham Salman ◽  
Nada Al-Ghaban ◽  
Mohammed Eesa ◽  
Alaa Atiyah ◽  
Saad Farid
Keyword(s):  
Acetic Acid ◽  
Functionally Graded Materials ◽  
Electrophoretic Deposition ◽  
Low Cost ◽  
Functionally Graded ◽  
Alumina Layer ◽  
Graded Materials ◽  
Main Challenge ◽  
Graded Layers

Electrophoretic deposition (EPD) technique is used to prepare zirconia–alumina composite layers based on the principle of functionally graded materials (FGM). The FGM were prepared with five layers. The outer layer was composed of pure α-alumina to promote biocompatibility while the inner layer was stabilised zirconia (3Y-TZP), to benefit from its tough properties. The intermediate layers were stepwise graded layers. The stability of the EPD suspensions was the main challenge during the preparation steps. Due to availability and low cost, alcoholic solutions of polyethylene glycol (PEG) and toluene were used to control conductivity, dielectric constant and the viscosity of the suspension. The appropriately applied potential, (ζ), for the deposition of each layer, was achieved via gradation of the applied voltage, which was to optimise the packing of each layer and avoid cracking after sintering at 1500 °C. The cylindrical-shaped green specimens were obtained via deposition on graphite electrodes. A small amount of acetic acid was added during the deposition of the final outer alumina layer to introduce porosity, via the bubbling of acetic acid, to encourage osseointegration. The sintered specimens were implanted in rabbit tibial bone. In vivo histological tests showed the successful osseointegration of the implants to the rabbit bone.

scholarly journals MULTILAYER COATINGS Ti/TiN, Cr/CrN AND W/WN DEPOSITED BY MAGNETRON SPUTTERING FOR IMPROVEMENT OF ADHESION TO BASE MATERIALS

2015 ◽  
Vol 55 (6) ◽  
pp. 388 ◽  
Author(s):  
Jakub Horník ◽  
Stanislav Krum ◽  
David Tondl ◽  
Maxim Puchnin ◽  
Pavel Sachr ◽  
...  
Keyword(s):  
Functionally Graded Materials ◽  
Scratch Test ◽  
Functionally Graded ◽  
Point Of View ◽  
Multilayer Coatings ◽  
Graded Materials ◽  
Protective Function ◽  
Base Materials ◽  
Graded Layers ◽  
Graded Material

The paper deals with evaluation of single and multilayer layer PVD coatings based on Cr and Ti widely used in tool application. Additionally, W and WN based coating which are not so widespread were designed and deposited as functionally graded material. The coatings properties were evaluated from the point of view of hardness and adhesion. The hardness measuring was carried out using nanoindentation method. The scratch test was performed to test adhesion. Moreover, the presence of metallic interlayer in functionally graded materials further increases the coating adhesion by gradually approaching its composition to the substrate. Coatings consisting of W and WN have showed very good adhesion. With regard to the results of the scratch test, the multilayer coatings of CrN, TiN and WN have increased adhesion and can be assumed to have their protective function improved. Results will be appliedin development of functionally graded layers for functionally graded materials.

Investigation for the Fracture Process of WCp/Cu Functionally Graded Materials under Three-Point-Bending

2013 ◽  
Vol 683 ◽  
pp. 17-20
Author(s):  
Hai Ting Xia ◽  
Rong Xin Guo ◽  
Feng Yan ◽  
Hai Yu ◽  
Yu Bo Zhang
Keyword(s):  
Powder Metallurgy ◽  
Functionally Graded Materials ◽  
Fracture Process ◽  
Bottom Layer ◽  
Functionally Graded ◽  
Graded Materials ◽  
Bending Tests ◽  
Bending Performance ◽  
Three Point Bending ◽  
Graded Layers

In this paper, the fracture process of WCp/Cu functionally graded materials(FGMs) was investigated. The used materials were fabricated by powder metallurgy using tungsten carbide(WC) particles and copper(Cu) matrix, and had functionally graded layers. In order to investigate the fracture process of the FGM, three-point-bending tests of rectangular specimens were carried out. From the results, it can be seen that the bending performance of FGM structures with increasing WC content from head layer to the bottom layer excels that of FGM structures with decreasing WC content in three-point-bending tests.

Biomimetic Functionally Graded Materials: Synthesis by Impeller-Dry-Blending

2009 ◽  
Vol 3 ◽  
pp. 37-49 ◽  
Author(s):  
D.T. Chavara ◽  
Cyndi X. Wang ◽  
Andrew Ruys
Keyword(s):  
Functionally Graded Materials ◽  
Low Cost ◽  
Functionally Graded ◽  
Orthopaedic Implant ◽  
Materials Synthesis ◽  
Mollusc Shell ◽  
Graded Materials ◽  
Commercial Viability ◽  
Graded Material ◽  
Concentration Changes

Functionally graded materials (FGMs) can be found naturally in many biological structures, for example bamboo and the mollusc shell. They are defined as having a compositional or microstructural gradient, for example the gradation in fibre content in bamboo stems. A continuous bulk functionally graded material has the potential to be an ideal orthopaedic implant for load bearing applications. Due to the fabrication complexities involved in the production of these continuous bulk functionally graded materials, commercialisation and fabrication are still proving to be a challenge to researchers worldwide. This paper presents an overview of the redesigned novel commercially viable process known as the Impeller-Dry-Blending (IDB) process. Results presented in this paper of fabricated functionally graded materials illustrate the potential of IDB to produce continuous bulk functionally graded materials consisting of either compositional or porosity concentration changes. The successful fabrication of these continuous bulk functionally graded materials at such a low cost clearly demonstrates the commercial viability of the IDB process.

scholarly journals Modeling Flow-based Electrophoretic Deposition for Functionally Graded Materials

2021 ◽  
pp. 110000
Author(s):  
Miguel A. Salazar de Troya ◽  
Jason R. Morales ◽  
Brian Giera ◽  
Andrew J. Pascall ◽  
Marcus A. Worsley ◽  
...  
Keyword(s):  
Functionally Graded Materials ◽  
Electrophoretic Deposition ◽  
Functionally Graded ◽  
Graded Materials ◽  
Modeling Flow

Dynamic Analysis with Stress Recovery for Functionally Graded Materials: Numerical Simulation and Experimental Benchmarking

2014 ◽  
Vol 2 (1) ◽  
pp. 21
Author(s):  
Carlos Alberto Dutra Fraga Filho ◽  
Fernando César Meira Menandro ◽  
Rivânia Hermógenes Paulino de Romero ◽  
Juan Sérgio Romero Saenz
Keyword(s):  
Numerical Simulation ◽  
Dynamic Analysis ◽  
Functionally Graded Materials ◽  
Functionally Graded ◽  
Stress Recovery ◽  
Graded Materials
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