Reaction Between Titanium and Zirconia Powders During Sintering at 1500°C

Shirazi

J Biomedical Materials Res

et al. 2013

115

Functionally graded material (FGM) is a heterogeneous composite material including a number of constituents that exhibit a compositional gradient from one surface of the material to the other subsequently, resulting in a material with continuously varying properties in the thickness direction. FGMs are gaining attention for biomedical applications, especially for implants, owing to their reported superior composition. Dental implants can be functionally graded to create an optimized mechanical behavior and achieve the intended biocompatibility and osseointegration improvement. This review presents a comprehensive summary of biomaterials and manufacturing techniques researchers employ throughout the world. Generally, FGM and FGM porous biomaterials are more difficult to fabricate than uniform or homogenous biomaterials. Therefore, our discussion is intended to give the readers about successful and obstacles fabrication of FGM and porous FGM in dental implants that will bring state-of-the-art technology to the bedside and develop quality of life and present standards of care.

Section: Fabrication Techniques and Mechanical Behavior For Functionamentioning

confidence: 99%

Dental implants from functionally graded materials

Shirazi

J Biomedical Materials Res

et al. 2013

115

Archives of Metallurgy and Materials

“…where: d 2 -wall thickness of cake after casting time t 2 [mm], d 1 -wall thickness of cake after casting time t 1 [mm], f -correction factor for the viscosity of the water depending on the temperature, (slurry temperature at 21°C).…”

Section: Methodsmentioning

confidence: 99%

“…Ceramic-metal composites with a ceramic matrix can be shaped for bulk materials by method such as die pressing [1] or methods based on colloidal processing such as slip casting [2][3][4][5][6]. Slip casting is one of the most common methods used in ceramic technology.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ZrO2-Ti Composites by Slip Casting Method

Łada¹,

Falkowski²,

Miazga³

et al. 2016

Slip casting is one of the most popular shaping method in ceramic technology which allows producing a large number of elements in small period of time. This shaping technique gives a possibility to fabricate ceramic or composite materials such as ZrO 2 -Ti. Ti with its properties (low density, high melting point, high-temperature strength, good corrosion resistance and others) combine with ZrO 2 (high flexure strength, high compression resistance and very high K IC ) can be considered for different applications as constructional and functional materials. For the preparation of such composite nanometric zirconium oxide powder stabilized by 3 mol% Y 2 O 3 and micrometric titanium powder were used. Water-based slurries with 35, 40, 45 and 50 vol.% solid phase content were prepared with 3, 10 and 15 vol.% addition of titanium powder. Zeta potential and pH of prepared slurries were considered. The pH changes were tested as a function of Ti content. The viscosity of the prepared slurries was measured. The sedimentation tests for selected slurries were performed. The casting rate for slurry of 35% solid phase with 10 vol.% Ti was examined. These measurements showed good stability of slurries. With the increasing of the solid phase concentration the density of the green bodies increased. However, the increase of the content of Ti powder reduced the density of green body samples. For selected samples the SEM observations was carried out. Composites produced by slip casting were characterized by a homogenous distribution of Ti particles in the ZrO 2 matrix.

“…ZrO2 has superior thermal and mechanical properties, which are effective for TBCs [19]. One of superior mechanical properties of ZrO2 is high fracture toughness due to stress-induced transformation (from tetragonal to monoclinic crystal structures under some stress conditions, which can be used in enhancement of fracture toughness of various ceramics and ceramic matrix composites [20][21][22].…”

Section: Open Accessmentioning

confidence: 99%

Micromechanical Simulation of Thermal Cyclic Behavior of ZrO2/Ti Functionally Graded Thermal Barrier Coatings

Tsukamoto

2015

Coatings

This study numerically investigates cyclic thermal shock behavior of ZrO2/Ti functionally graded thermal barrier coatings (FG TBCs) based on a nonlinear mean-field micromechanical approach, which takes into account the time-independent and dependent inelastic deformation, such as plasticity of metals, creep of metals and ceramics, and diffusional mass flow at the ceramic/metal interface. The fabrication processes for the FG TBCs have been also considered in the simulation. The effect of creep and compositional gradation patterns on micro-stress states in the FG TBCs during thermal cycling has been examined in terms of the amplitudes, ratios, maximum and mean values of thermal stresses. The compositional gradation patterns highly affect thermal stress states in case of high creep rates of ZrO2. In comparison with experimental data, maximum thermal stresses, amplitudes and ratios of thermal stresses can be effective parameters for design of such FG TBCs subject to cyclic thermal shock loadings.