Tribological Analysis of Alumina Nanocomposites for Orthopedics Applications

2008 ◽  
Author(s):  
Carlos Morillo ◽  
Yoshinori Sawae ◽  
Teruo Murakami
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Wear Rate ◽  
Fetal Bovine Serum ◽  
Wear Test ◽  
Distilled Water ◽  
Indentation Method ◽  
Hip Prostheses ◽  
Fetal Bovine ◽  
Tribological Analysis

In this study the tribological analysis of Al2O3 nanocomposites/Al2O3 pair; proposed as a candidate material to fabricate hip prostheses was carried out. Nanopowders of Al2O3 (AKP 50, 300 nm), TiO2 (PS-25, 50 nm) and Co metallic powder (Nilaco, 28 nm) were mixed and hot pressed. Wear test was carried out in a pin-on-plate tribometer, with a frequency of 1 Hz, a load of 49 N, for 4h; the counterface used was Al2O3. Mechanical properties as Vickers hardness, fracture toughness and Young’s modulus were estimated using the indentation method. Distilled water and fetal bovine serum solution (FBSS) were used as environment. It was found that the specific wear rate of Al2O3 nanocomposites was about 10−8mm3/N*m and the coefficients of friction were around 0.3–0.5 for FBSS. Worn surfaces were observed using SEM.

scholarly journals Silicon Nitride-Based Composites with the Addition of CNTs—A Review of Recent Progress, Challenges, and Future Prospects

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2799
Author(s):  
Awais Qadir ◽  
Péter Pinke ◽  
Ján Dusza
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Carbon Nanotube ◽  
Silicon Nitride ◽  
Wear Rate ◽  
Recent Progress ◽  
Bending Strength ◽  
Microstructure Development ◽  
Future Prospects ◽  
Microstructure Characteristics

In this overview, the results published to date concerning the development, processing, microstructure characteristics, and properties of silicon nitride/carbon nanotube (Si3N4 + CNTs) composites are summarized. The influence of the different processing routes on the microstructure development of the Si3N4 + CNTs is discussed. The effects of the CNTs addition on the mechanical properties—hardness, bending strength and fracture toughness—and tribological characteristics—wear rate and coefficient of friction—are summarized. The characteristic defects, fracture origins, toughening and damage mechanisms occurring during the testing are described. The influence of the CNTs’ addition on the thermal and functional properties of the composites is discussed as well. New trends in the development of these composites with significant potential for future applications are outlined.

Effect of heat treatment on mechanical and tribological properties of aluminum metal matrix composites

2020 ◽  
Vol 234 (22) ◽  
pp. 4493-4504
Author(s):  
Manu Sam ◽  
N Radhika ◽  
Katru Pavan Sai
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Wear Rate ◽  
Response Surface ◽  
Surface Deformation ◽  
Wear Test ◽  
Composite Surface ◽  
X Ray ◽  
Mechanical And Tribological Properties ◽  
Sliding Distance

LM25 aluminum alloy reinforced with 10 wt% of TiB2, WC, and ZrO2 were squeeze cast to investigate the effect of T6 heat treatment on tribo-mechanical properties. Among all, WC-reinforced composite achieved superior mechanical properties at the aging time of 8 h. Microstructural examination performed on all composites and alloy concluded that the presence of WC in T6 LM25 caused reduction of α-Al dendrite size, exhibiting superior properties for this composite. X-ray diffraction analysis conducted on alloy and WC-reinforced superior composite revealed formations of phases, which improved their mechanical properties. Energy-dispersive X-ray spectroscopy analysis quantified the actual intensity of WC presence in the superior composite along with its other constituents. Response surface methodology model developed for wear test of the superior composite involves parametric range like applied load (10–50 N), sliding velocity (1–4 m/s), and sliding distance (500–2500 m). Analysis of variance along with regression analysis proved that, statistical analytical model developed good relationship between the actual wear rate and process parameters. Response surface plots represented the linearly increasing wear trend with respect to load and sliding distance. Wear rate dropped initially and raised later on along with velocity. Scanning electron microscopy exhibited the surface deformation prevailing on the composite surface at high load.

scholarly journals Tribological analysis of wire additive manufactured Ti6Al4V by Electron Beam source

2021 ◽  
Author(s):  
Manjunath A ◽  
Anandakrishnan V ◽  
Ramachandra S ◽  
Parthiban K ◽  
Sathish S
Keyword(s):  
Electron Beam ◽  
Additive Manufacturing ◽  
Wear Rate ◽  
Complex Geometry ◽  
Weight Ratio ◽  
Wear Test ◽  
Substrate Material ◽  
Wear Behaviour ◽  
Dry Sliding Wear ◽  
Tribological Analysis

Abstract Additive manufacturing through electron beam, is an attractive and fast growing additive manufacturing process for complex geometry in the aerospace, automotive and rapid tooling industry. Ti6Al4V is the material which is widely used in aerospace industry owing to its good strength-to-weight ratio, higher strength and toughness and admirable corrosion resistance. Ti6Al4V samples were realized through wire electron beam additive manufacturing by Pre-positioning the wire and then fusing it to the substrate material. The samples were subjected to standard dry sliding wear test to explore the wear behaviour. The wear analysis exposed the substantial effects of parameters on the wear rate. Likewise, the mechanisms that significantly influenced the wear rate was identified with worn surface and debris analysis.

Mechanical properties of single-quasicrystalline AlCuCoSi

1991 ◽  
Vol 6 (6) ◽  
pp. 1165-1168 ◽  
Author(s):  
R. Wittmann ◽  
K. Urban ◽  
M. Schandl ◽  
E. Hornbogen
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Friction Coefficient ◽  
Modulus Of Elasticity ◽  
Vickers Indentation ◽  
Indentation Method ◽  
Abrasive Friction ◽  
Highly Strained ◽  
First Time

The mechanical properties of single-quasicrystals of decagonal AlCoCuSi have been studied for the first time by applying the Vickers indentation method. The hardness has been determined as H ≃ 9.6 MPa. Estimates for the modulus of elasticity and the fracture toughness are given. The quasicrystals are highly strained internally. Scratching experiments show slight anisotropies in the abrasive friction coefficient. The dominant abrasive mechanism is microplowing.

Role of Zirconia Filler on Mechanical Properties and Dry Sliding Wear Behavior of Glass/Basalt Hybrid Fabric Reinforced Epoxy Composites

2019 ◽  
Vol 895 ◽  
pp. 200-205
Author(s):  
B.S. Kanthraju ◽  
Bheemappa Suresha ◽  
H.M. Somashekar
Keyword(s):  
Mechanical Properties ◽  
Wear Rate ◽  
Sliding Wear ◽  
Wear Behavior ◽  
Mechanical Test ◽  
Basalt Fiber ◽  
Wear Test ◽  
Specific Wear Rate ◽  
Dry Sliding Wear ◽  
Dry Sliding

This paper presents the effect of zirconia filler on mechanical properties and dry sliding wear of bidirectional hybrid (glass and basalt fiber) fabric reinforced epoxy (G-B/E) composites. Fabrication was done by hand layup method followed by compression molding. The effect of zirconia filler loading on mechanical characteristics like hardness, tensile and flexure of fabricated G-B/E composites were determined according to ASTM standards. Also, wear behavior under dry sliding condition was performed using pin-on-disc machine for different applied normal loads/sliding distance. Experimental results reveal that incorporation of zirconia filler improves the mechanical properties. Further, the wear test results indicated addition of zirconia into G-B/E hybrid fiber composites plays important role on specific wear rate under the tribo-conditions selected for the study. Further, inclusion of zirconia into G-B/E composites shows improved wear resistance and addition of 6 wt. % of zirconia exhibits least specific wear rate compared to other hybrid G-B/E composites. In addition, Scanning electron microscope images of selected mechanical test fractured coupons also have been discussed.

Effect of La2O3-Rich Glass Addition on Sintering of Zirconia Based Ceramics

2008 ◽  
Vol 587-588 ◽  
pp. 104-108
Author(s):  
Claudinei dos Santos ◽  
R.C. Souza ◽  
Maria Helena F.V. Fernandes ◽  
Nuno A.F. Almeida ◽  
Flávia A. Almeida ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tetragonal Zirconia ◽  
X Ray Diffraction ◽  
Indentation Method ◽  
Glass Addition ◽  
X Ray ◽  
Heating And Cooling ◽  
Mesh Screen ◽  
Cold Pressed

In this study, the influence of La-rich glass addition and sintering conditions on the densification and mechanical properties of 3 mol.%Y2O3-stabilized tetragonal zirconia polycrystals (3Y-TZP) ceramics were evaluated. High-purity tetragonal ZrO2 powder stabilized with 3 mol.% Y2O3 and La2O3-Rich glass were used as starting powders. Two compositions, ZrO2 containing 5 and 10 wt.% of a La2O3-rich glass were studied in this work. The starting powders were mixed/milled by planetary milling, dried at 90°C for 24 hours, sieved through a 60 mesh screen and uniaxially cold pressed under 80 MPa. The samples were sintered in air at 1200, 1300 and 1400°C for 60min, and at 1450°C for 120min, with heating and cooling rates of 10°C/min. Sintered samples were characterized by relative density, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The mechanical properties, hardness and fracture toughness, were obtained by Vickers indentation method. Dense sintered samples were obtained for all conditions. Samples sintered at 1300°C for 60 min presented the optimal mechanical properties with hardness of 1170 kgf.mm-2 and fracture toughness of 8.3 MPam1/2.

Dynamic Surface Features of Cultured Cells Visualized by Combining Cinephotomicrography and SEM

1975 ◽  
Vol 33 ◽  
pp. 516-517
Author(s):  
Bruce Wetzel ◽  
Gary Jones ◽  
Edwina Westbrook ◽  
Cecil Fox ◽  
Katherine Sanford
Keyword(s):  
Cell Growth ◽  
Phase Contrast ◽  
Cultured Cells ◽  
Fetal Bovine Serum ◽  
Time Lapse ◽  
Distilled Water ◽  
Dynamic Surface ◽  
Surface Features ◽  
Fetal Bovine ◽  
And Behavior

The surface morphology of cells grown to subconfluent monolayers can be remarkably diverse and changeable. To study the dynamics of these surface features, cell growth and behavior can be observed by time-lapse cinematography without noticeably perturbing the culture,and the same cells reexamined by SEM1.Mouse fibroblasts of nonneoplastic and neoplastic lines derived from a common single cell were trypsinized, then grown in NCTC-135 with 10% filtered fetal bovine serum in a 10% CO2 atmosphere for 48 hours at 37°C on glass coverslips within sealed glass flasks. During this period a field of cells was filmed at one frame/minute with phase contrast optics (80X). Cells were fixed by the addition of an equal volume of 6% phosphate-buffered glutaraldehyde for 90 minutes at 37°C, washed with distilled water, dehydrated through ethanol to amyl acetate, dried by the CO2 critical point method, and vacuum coated with carbon and gold-palladium.

In Vitro Cytotoxicity of Alginate-Encapsulating Ferrite Particles Using WST-1

2005 ◽  
Vol 284-286 ◽  
pp. 815-818
Author(s):  
Sang Bae Lee ◽  
Se Ho Lee ◽  
D.H. Kim ◽  
Doug Youn Lee ◽  
Yong Keun Lee ◽  
...  
Keyword(s):  
Cell Viability ◽  
Calcium Alginate ◽  
Fetal Bovine Serum ◽  
Sol Gel ◽  
In Vitro Cytotoxicity ◽  
Distilled Water ◽  
Sol Gel Process ◽  
Fetal Bovine ◽  
Alginate Content

The purpose of this study was to evaluate the cytotoxicity of alginate-encapsulting ferrite particles in vitro. Various ferrite particles such as Ba-ferrite, Sr-ferrite, Co-ferrite, Co/Ni-ferrite were prepared by sol-gel process. Ferrite particles were encapsulated via calcium alginate process with different alginate contents ranged from 10 to 100 wt%. Mouse-fibroblastic NCTC L-929 cells were cultured in RPMI-1640 medium with 10% fetal bovine serum. The alginate-encapsulating ferrites were extracted in 5 ml of distilled water under pH 6.5 at 121°C for 1 h in accordance with ISO 10993-12. In vitro cytotoxicity was evaluated by WST-1. The results of this study indicated that the alginate-encapsulting ferrite particles affected cell viability by increasing alginate contents. Especially, alginate-encapsulating process were enhanced cell viability of ferrites such as Sr-ferrite, Co/Ni-ferrite, and Ba-Ferrite when alginate content was 10 wt%.

Dissolution and Mechanical Properties of Sintered Hydroxyapatite Immersed in Water

2006 ◽  
Vol 317-318 ◽  
pp. 789-792 ◽  
Author(s):  
Dong Seok Seo ◽  
Hwan Kim ◽  
Kyu Hong Hwang ◽  
Jong Kook Lee
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Weight Loss ◽  
Grain Boundaries ◽  
Mechanical Characteristics ◽  
Surface Damage ◽  
Distilled Water ◽  
Moisture Protection ◽  
Powder Compacts

Dissolution of hydroxyapatite (HAp) in distilled water and related mechanical properties were investigated. The commercially obtained stoichiometric HAp powders were used as starting materials. After preparing powder compacts, the disks were sintered at 1200oC for 2 h in air with under moisture protection. The sintered specimens were then placed into 40 ml of 7.4 distilled water. After immersing for certain period of time at 37oC, weight loss, microstructure, and mechanical characteristics of the specimens were investigated. Fracture toughnesses were measured for both sintered and immersed HAp for comparison. Evidence for the surface damage was observed with appearance of micron-level of pitting and grain boundaries dissolved. The value for fracture toughness decreased due to dissolution of the materials.

Toughing of ZrAlN Film through Superlattice Design

2011 ◽  
Vol 291-294 ◽  
pp. 141-145 ◽  
Author(s):  
Jun Du ◽  
Xiao Ying Zhu ◽  
Zhi Hai Cai ◽  
Ping Zhang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Magnetron Sputtering ◽  
Elastic Recovery ◽  
Plastic Work ◽  
Indentation Method ◽  
Nano Indentation ◽  
Radial Cracks

Two kinds of magnetron sputtering ZrAlN films containing 23%atAl were deposited. The first was multicomponent ZrAlN film, the second was structure gradient and mulilayer film, named superlattice ZrAlN film. The microstructure was studied by FESEM, TEM , XRD, its mechanical properties were evaluated by nano-indentation method. The fracture toughness of films were determined from the length of ‘radial cracks’ on the applied diamond identer load 1.96N. the results show that, multicomponent ZrAlN film has hardness value of 35GPa, fracutre toughness value of 1.97MPa·m-0.5; while superlattice ZrAlN film has coresponding value of 40.1GPa and 3.17MPa·m-0.5. TEM image illustrates the superlattice ZrAlN film period is 2.5nm, nanoidentation test shows superlattice film has higher elastic recovery parameter and lower plastic work.

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