Preparation of Bioactive Porous Titanium-Molybdenum Alloy through Powder Metallurgy

2009 ◽  
Vol 620-622 ◽  
pp. 745-748
Author(s):  
Yasuo Yamada ◽  
Yun Cang Li ◽  
Jian Yu Xiong ◽  
Takumi Banno ◽  
Peter D. Hodgson ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Elastic Modulus ◽  
Body Fluid ◽  
Porous Titanium ◽  
Plateau Stress ◽  
Natural Bone ◽  
Porous Ti ◽  
Apatite Coating ◽  
Sintering Method

Porous Ti-Mo alloy samples with different porosities from 52% to 72% were successfully fabricated by the space-holder sintering method. The pore size of the porous Ti-Mo alloy samples were ranged from 200 to 500 μm. The plateau stress and elastic modulus of the porous Ti-Mo alloy samples increases with the decreasing of the porosity. Moreover, an apatite coating on the Ti-Mo alloy after an alkali and heat treatment was obtained through soaking into a simulated body fluid (SBF). The porous Ti-Mo alloy provides promising potential for new implant materials with new bone tissue ingrowth ability, bioactivity and mechanical properties mimicking those of natural bone.

Mechanical Properties and Bioactive Surface Modification via Alkali-Heat Treatment of Porous Titanium for Biomedical Applications

2013 ◽  
Vol 647 ◽  
pp. 511-517 ◽  
Author(s):  
Xiao Hua Wang ◽  
Jin Shan Li ◽  
Rui Hu ◽  
Hong Chao Kou ◽  
Lian Zhou
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Elastic Modulus ◽  
Relative Density ◽  
Relative Yield ◽  
Porous Titanium ◽  
X Ray Diffraction ◽  
Plateau Stress ◽  
Bioactive Surface Modification ◽  
The Relationship

Porous titanium with relative density from 0.4 to 0.64 was prepared by powder metallurgy. The porous structures were examined by scanning electron microscopy and phase constituents were analysed by X-ray diffraction. Mechanical properties of the porous titanium were investigated using a compressive test. To enhance the bioactivity of the alloy surface, alkali-heat treatment was used to modify the surface. Results indicate that the elastic modulus and plateau stress of the porous titanium samples both as-sintered and alkali and heat treatment decrease with decreasing relative density. And the relationship between relative yield stress and elastic modulus with relative density of porous titanium after alkali and heat treatment are agreement with that of as-sintered porous titanium. After alkali-heat treatment, a bioactive Na2Ti5O11 layer formed on the surface of the pre-treated porous titanium. A reduction in the number and severity of this bioactive deposition was observed with the decrease in relative density of porous titanium because of the increasing surface area. In a word, The mechanical properties of the porous titanium can be tailored to match those of human bone, therefore, these bioactive porous titanium have the potential to be a bioactive implant material.

Porous Titanium with Porosity Gradients for Biomedical Applications

2007 ◽  
Vol 539-543 ◽  
pp. 720-725 ◽  
Author(s):  
Cui E Wen ◽  
Yasuo Yamada ◽  
A. Nouri ◽  
Peter D. Hodgson
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Cell Structure ◽  
Peak Stress ◽  
Porous Titanium ◽  
Outer Shell ◽  
Solid Core ◽  
Natural Bone ◽  
Porous Architecture ◽  
Highly Porous

Highly porous titanium and titanium alloys with an open cell structure are promising implant materials due to their low elastic modulus, excellent bioactivity, biocompatibility and the ability for bone regeneration. However, the mechanical strength of the porous titanium decreases dramatically with increasing porosity, which is a prerequisite for the ingrowth of new bone tissues and vascularization. In the present study, porous titanium with porosity gradients, i.e. solid core with highly porous outer shell was successfully fabricated using a powder metallurgy approach. Satisfactory mechanical properties derived from the solid core and osseointegration capacity derived from the outer shell can be achieved simultaneously through the design of the porosity gradients of the porous titanium. The outer shell of porous titanium exhibited a porous architecture very close to that of natural bone, i.e. a porosity of 70% and pore size distribution in the range of 200 - 500 μm. The peak stress and the elastic modulus of the porous titanium with a porosity gradient (an overall porosity 63%) under compression were approximately 152 MPa and 4 GPa, respectively. These properties are very close to those of natural bone. For comparison, porous titanium with a uniform porosity of 63% was also prepared and characterised in the present study. The peak stress and the elastic modulus were 109 MPa and 4 GPa, respectively. The topography of the porous titanium affected the mechanical properties significantly.

The Fabrication and the Properties of Gradient Porous Titanium by Centrifugal Deposition and Sintering

2014 ◽  
Vol 1042 ◽  
pp. 38-43 ◽  
Author(s):  
Guo Jian Cao ◽  
Wan Jiao Xu ◽  
Yi Cheng Feng ◽  
Wan Yong Tang
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Pore Structure ◽  
Titanium Alloys ◽  
Porous Titanium ◽  
Optical Microscope ◽  
Vacuum Sintering ◽  
Porous Ti ◽  
Bone Replacement ◽  
Mechanical Compatibility

Gradient-porous Titanium alloys can be applied to manufacturing implants for bone replacement, due to their good biological and mechanical compatibility. In this work, the feasibility of fabricating gradient-porous Titanium by centrifugal deposition and vacuum sintering was investigated. The apparent porosity of the gradient-porous Ti examined by Archimedes method is 56%. And the open pores occupy 89%. The pore structure was observed by an optical microscope. And its porosities at different radius were calculated by image software based on optical microscopic images. In addition, a nanoindentation was employed to characterize the mechanical properties at different radius. The results showed that the porosity of the sample increased with increasing of radius. Besides, both the elastic modulus and hardness changed alone radius with a same trend.

Development and Characterization of New Ti-25Ta-Zr Alloys for Biomedical Applications

2021 ◽  
Vol 1016 ◽  
pp. 137-144
Author(s):  
Pedro Akira Bazaglia Kuroda ◽  
Fernanda de Freitas Quadros ◽  
Mycaela Vieira Nascimento ◽  
Carlos Roberto Grandini
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Elastic Modulus ◽  
Biomedical Applications ◽  
Solution Heat Treatment ◽  
High Hardness ◽  
Microstructural Characterization ◽  
Β Phase ◽  
Cp Ti ◽  
Microscopy Techniques

This paper deals with the study of the development, structural and microstructural characterization and, selected mechanical properties of Ti-25Ta-50Zr alloy for biomedical applications. The alloy was melted in an arc furnace and various solution heat treatments were performed to analyze the influence of the temperature and time on the structure, microstructure, microhardness and elastic modulus of the samples. The structural and microstructural results, obtained by X-ray diffraction and microscopy techniques, showed that the solution heat treatment performed at high temperatures induces the formation of the β phase, while solution heat treatment performed at low temperatures induces the formation of the α” and ω metastable phases. Regarding the effect of time, samples subjected to heat treatment for 6 hours have only the β phase, indicating that lengthy treatments suppress the α” phase. Regarding the hardness and elastic modulus, the alloy with the α” and ω phases, after treatment performed at a temperature of 500 °C, has a high hardness value and elastic modulus due to the presence of the ω phase that hardens and weakens alloys. The titanium alloys developed in this study have excellent mechanical properties results for use in the orthopedic area, better than many commercial materials such as cp-Ti, stainless steel and Co-Cr alloys.

Effect of Sintering Temperature on Porous Structures and Mechanical Properties of Ti-39Nb-6Zr Alloys

2016 ◽  
Vol 848 ◽  
pp. 532-537 ◽  
Author(s):  
Ye Shao ◽  
Xiao Yun Song ◽  
Wen Jun Ye ◽  
Song Xiao Hui ◽  
Yang Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Sintering Temperature ◽  
Porous Structures ◽  
Powder Metallurgy Technique ◽  
Porous Ti ◽  
The Stability ◽  
Surrounding Bone ◽  
Compressive Tests

Titanium and its alloys have been widely used as implants replacing hard human tissues in biomedical fields. To improve the stability of implants in the surrounding bone tissues, the materials with porous structures were fabricated. In this paper powder metallurgy technique was employed to fabricate porous Ti-39Zr-6Nb (wt.%) alloys. The porous structures and mechanical properties of the porous alloys were examined by scanning electron microscopy (SEM) and compressive tests. The results showed that with increasing the sintering temperature the porosity of the alloys decreased and the compressive strength and the elastic modulus increased. The porosity of the alloys was in the range from 20.8% to 23.2%, and the pore sizes mostly centered in 10~30μm. The compressive strength and the elastic modulus were in the range from 110.4 to 292.4MPa and 4.7 to 12.4GPa respectively, which was close to human bone.

Investigation of Pore Structures on Mechanical Properties of Porous Ti by 3D Finite Element Models

2013 ◽  
Vol 647 ◽  
pp. 683-687
Author(s):  
Mi Gong ◽  
Hong Chao Kou ◽  
Yu Song Yang ◽  
Guang Sheng Xu ◽  
Jin Shan Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Elastic Modulus ◽  
Yield Strength ◽  
Finite Element Models ◽  
3D Finite Element ◽  
Pore Model ◽  
Porous Ti ◽  
Pore Structures ◽  
Medium Porosity

The pore structures on mechanical properties of porous Ti were investigated by 3D finite element models. Calculated elastic modulus and yield strength suggested that square-pore models exhibit lower modulus and higher strength compared with another two kinds of shapes (circle and hexagonal). In addition, under the condition of medium porosity (58.96%), integrated property was found in square-pore model which elastic modulus was 26.97GPa, less than 1/3 of hexagonal-pore model; while the yield strength maintained 63.82MPa, doubled the figure of circle-pore model. Thus, models with square-pore structures show potential perspective as hard tissue replacements. Investigation on anisotropy of microstructure implies that the elastic modulus was affected more intensively than the yield strength.

Preparation of a Bioactive Poly(ε-Caprolactone) Triol/Silica Composite

2006 ◽  
Vol 309-311 ◽  
pp. 481-484
Author(s):  
Sang Hoon Rhee ◽  
Yong Keun Lee ◽  
Bum Soon Lim
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Body Fluid ◽  
Sol Gel ◽  
Tetraethyl Orthosilicate ◽  
3 Dimensional ◽  
Silica Composite ◽  
Dimensional Network ◽  
Heat Treated

Effect of poly(ε-caprolactone) structure on the mechanical properties and apatite-forming ability of poly(ε-caprolactone)/silica composite was investigated. Star-shaped poly(ε-caprolactone) was used in the experiment and it was end-capped with 3-isocyanopropyl triethoxysilane following the reaction with tetraethyl orthosilicate by sol-gel method. It was heat-treated at 150 oC for 24 hours and then tensile mechanical and dynamic viscoelastic testings were conducted, respectively. Its bioactivity was evaluated by the apatite forming ability in simulated body fluid at 36.5 oC. Its tensile strength was about 22 MPa while elastic modulus was about 2.6 GPa when the content of poly(ε-caprolactone) was 60 wt.%. The formation of apatite crystals on its surface was confirmed after 1 week of soaking in the SBF. The high elastic modulus of this composite was explained in terms of its 3-dimensional network structure.

scholarly journals Development of Porous Titanium Sheet with High Porosity and Good Mechanical Properties

2020 ◽  
Vol 321 ◽  
pp. 13004
Author(s):  
Yasuhiko Goto ◽  
Yosuke Inoue ◽  
Hideki Fujii ◽  
Matsuhide Horikawa
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Density Ratio ◽  
Porous Titanium ◽  
High Porosity ◽  
Sintering Process ◽  
Titanium Sheet ◽  
Porous Ti ◽  
Process Effects ◽  
Sintering Condition

To respond to the requirements for porous Ti sheet with the balanced properties of high porosity and good mechanical properties, and to optimize the manufacturing conditions of the simple powder-filling plus sintering process, effects of sintering temperatures on density and bending strength in porous Ti sheet were investigated. The optimum sintering condition was 900-950 °C for 1h to obtain porous Ti sheet with the balanced density ratio (around 40%) and high bending strength. The polyhedron shape of HDH powders contributed to those balanced properties, in which localized sintering raised bending strength with keeping high porosity (low density). Using the optimum manufacturing conditions, large sized porous Ti sheet of 400 × 800 × 0.5 mm was successfully manufactured.

Structural Characteristics and Mechanical Properties of Biomedical Porous Ti-10Mo Alloy Fabricated by Selective Laser Sintering

2012 ◽  
Vol 520 ◽  
pp. 234-241
Author(s):  
Fang Xia Xie ◽  
Xin Lu ◽  
Xin Bo He ◽  
Xuan Hui Qu
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Sintering Temperature ◽  
Structural Characteristics ◽  
Average Pore Size ◽  
Selective Laser Sintering ◽  
Compressive Yield Strength ◽  
Average Pore ◽  
Porous Ti ◽  
Interconnected Pores

Ti-Mo alloy is one of the most prospective metallic biomaterials for implant application because of its low elastic modulus, high corrosion resistance and tissue compatibility. A complex-shaped porous Ti-10Mo alloy from a mixture of elemental metal powders and polymer binders was processed by selective laser sintering forming, followed by thermal debinding and sintering in vacuum. The effects of processing parameters on structural characteristics and mechanical properties were studied. The results indicate that the pore characteristic parameters, matrix microstructure and mechanical properties strongly depend on the sintering temperature. Specimens sintered at 1100 °C exhibit a higher porosity of 52.41%, and possess many three-dimensionally interconnected pores with an average size of 200 μm, and the matrix is dominated by α and β phases, and meanwhile the alloy exhibits a compressive yield strength of 95.59 MPa and an elastic modulus of 4.89 GPa at room temperature. With the rise in sintering temperature, both the porosity and the average pore size of specimens gradually decrease, and the interconnected pores tend to be closed. Specimens sintered at 1400 °C are characterized by a porosity of 26.32% and an average pore size of 60 μm with a compressive yield strength of 440 MPa and an elastic modulus of 35.26 GPa.

The Study of Surface Modification and Biocompatibility of Porous Titanium

2013 ◽  
Vol 647 ◽  
pp. 104-110
Author(s):  
Ruo Lin Li ◽  
Hong Chao Kou ◽  
Guang Sheng Xu ◽  
Ting Li Lu ◽  
Jin Shan Li
Keyword(s):  
Heat Treatment ◽  
Biological Activity ◽  
Body Fluid ◽  
Titanium Surface ◽  
Porous Titanium ◽  
Hydroxyapatite Coating ◽  
Phosphate Solution ◽  
Open Cell ◽  
Good Biocompatibility ◽  
Sbf Solution

A hydroxyapatite coating on the porous titanium surface was prepared by NaOH-treated and heat treatment followed by immersing into a supersaturated calcium phosphate solution. It is found that the porous titanium was in an open-cell microstructure. The morphology, element content and phase composition of the hydroxyapatite coating were also analyzed. The cytotoxicity of porous titanium surface were tested. The results showed the hydroxyapatite of porous titanium surface by NaOH-treated and heat treatment was attached uniformly and had a certain thickness after immersion into the simulated body fluid (SBF) solution for 5 days, the hydroxyapatite coating was formed after immersion into the SBF solution for 12 days, it demonstrated good biocompatibility and enhancement of biological activity, it was conducive to the proliferation and adhesion of osteoblasts.

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