Mechanical Properties Improvement of Porous Titanium-Bioglass Nanocomposites by Mechanical Alloying

2013 ◽  
Vol 829 ◽  
pp. 319-323
Author(s):  
Saeed Riahi ◽  
Mohammad Rajabi ◽  
Sayed Mahmood Rabiee
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Biomedical Application ◽  
Diffraction Method ◽  
Porous Titanium ◽  
Sintering Process ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Space Holder

In this study, porous titanium-10 wt.% bioglass nanocomposites were fabricated by the combination of mechanical alloying and a space holder sintering process. The mixed powders were mechanically alloyed for 15 h. The blended Ti-Bioglass was mixed with 30 wt.% carbamide as a space holder. The mixtures were uniaxially pressed and finally, the green compacts sintered at 1150°C for 5 hours. The porous structures are characterized by X-ray diffraction method (XRD) and scanning electron microscopy (SEM). The mechanical properties were examined using micro hardness and compression tests. The investigation revealed that after 15 h of milling, the Bioglass dissolved in Ti lattice. Also, results show that nanostructured Ti-10 wt.% Bioglass with 31.5 nm crystallite size possess greater hardness compared to respective microcrystalline titanium and desirable compressive strength for using in biomedical application.

Nanoindentation Characterization of Mechanically Alloyed Fe-Al-Si Powders

2018 ◽  
Vol 784 ◽  
pp. 15-20 ◽  
Author(s):  
Petr Haušild ◽  
Jaroslav Čech ◽  
Miroslav Karlík ◽  
Filip Průša ◽  
Pavel Novák ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Preparation Technique ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Microstructure And Mechanical Properties ◽  
Plasma Sintering ◽  
Special Sample Preparation ◽  
Spark Plasma ◽  
Powder Particles

The effect of processing conditions on microstructure and mechanical properties of Fe-Al-Si powders was studied by means of scanning electron microscopy, X-ray diffraction and nanoindentation. Fe-Al-Si alloy powder was prepared from pure elemental powders by mechanical alloying. Microstructure and mechanical properties of powders were characterized after various durations of mechanical alloying. Special sample preparation technique was developed allowing to characterize the properties of individual powder particles after each step of processing in a planetary ball mill. This step-by-step characterization allowed to find the optimum conditions for subsequent spark plasma sintering.

scholarly journals Microstructure and Compressive Behavior of Al–Y2O3 Nanocomposites Prepared by Microwave-Assisted Mechanical Alloying

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 414 ◽  
Author(s):  
Manohar Reddy Mattli ◽  
Abdul Shakoor ◽  
Penchal Reddy Matli ◽  
Adel Mohamed Amer Mohamed
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Mechanical Alloying ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
Homogeneous Distribution ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Microwave Assisted ◽  
Electron Microscopy Analysis

In this study, Al–Y2O3 nanocomposites were synthesized via mechanical alloying and microwave-assisted sintering. The effect of different levels of yttrium oxide on the microstructural and mechanical properties of the Al–Y2O3 nanocomposites were investigated. The density of the Al–Y2O3 nanocomposites increased with increasing Y2O3 volume fraction in the aluminum matrix, while the porosity decreased. Scanning electron microscopy analysis of the nanocomposites showed the homogeneous distribution of the Y2O3 nanoparticles in the aluminum matrix. X-ray diffraction analysis revealed the presence of yttria particles in the Al matrix. The mechanical properties of the Al–Y2O3 nanocomposites increased as the addition of yttria reached to 1.5 vol. % and thereafter decreased. The microhardness first increased from 38 Hv to 81 Hv, and then decreased to 74 ± 4 Hv for 1.5 vol. % yttria. The Al–1.5 vol.% Y2O3 nanocomposite exhibited the best ultimate compressive strength and yielded a strength of 359 ± 7 and 111 ± 5 MPa, respectively. The Al–Y2O3 nanocomposites showed higher hardness, yield strength, and compressive strength than the microwave-assisted mechanically alloyed pure Al.

Mechanical Properties of Microwave Sintered 60YSZ-Al2O3/10HAP Bioceramics Composites

2014 ◽  
Vol 627 ◽  
pp. 18-23
Author(s):  
M.R.N. Liyana ◽  
Nur Maizatul Shima Adzali ◽  
W. Rahman ◽  
M.Z.M. Zamzuri ◽  
Harun Azmi
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Microwave Heating ◽  
Sintering Temperature ◽  
Biomedical Application ◽  
Xrd Analysis ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Processing Times ◽  
Large Particles

Microwave heating technology promising shorter processing times and less energy consumption beneficial for economic perspective with improved properties and better microstructural control. This study focussed on microwave sintered bioceramics material of 60YSZ-Al2O3/10HAP mixture fabricated by powder metallurgy route. The study was conducted based on three different sintering temperatures, starting with 900 °C, 1000°C ended with 1100°C. Mechanical properties of materials such as porosity, density, hardness and compressive strength were then determined for each composites. Results showed that lowest porosity was obtained at 1000°C which promoting to higher density, hardness and compressive strength. However, the increasing sintering temperature up to 1100 °C was initiated the decomposition of HAP and constitutes the formation of CaZrO3determined by X-ray Diffraction (XRD) analysis. Microstructure characterization by Scanning Electron Microscope (SEM) observed the growth of large particles and pores result in excessive grain coarsening. Better sinterability was achieved through an adequate sintering temperature of 1000°C with no reaction reported between HA and ZrO2during the sintering process facilitate by microwave hybrid heating. The pores was found to be interconnected for each composites via microwave heating expected to be useful for biomedical application which was favorable to osteo-integration.

Role of SiC ceramic particles on the physical and mechanical properties of Al–4%Cu metal matrix composite fabricated via mechanical alloying

2016 ◽  
Vol 51 (9) ◽  
pp. 1285-1298 ◽  
Author(s):  
Mahnaz Keneshloo ◽  
Moslem Paidar ◽  
Morteza Taheri
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Mechanical Alloying ◽  
Morphological Changes ◽  
Aluminum Matrix ◽  
Diffraction Method ◽  
Physical And Mechanical Properties ◽  
X Ray Diffraction ◽  
Sic Particles ◽  
The Matrix

In the present investigation, Al–Cu composites with SiC particulates were fabricated via mechanical alloying process. The aim of this study was to evaluate the effect of milling time (8, 12, 16 and 32 h), particle size (30 nm and 15 µm) and volume fractions (5, 10 and 15 wt.%) of SiC particles on the metallurgical and mechanical properties. Scanning electron microscopy equipped with X-ray diffraction method was used to investigate the microstructural evolution and morphological changes created during mechanical alloying. Microstructural study indicated that SiC particles were well distributed after the mechanical alloying process. A homogenous distribution of the particles was obtained by 15 wt.% of SiC particles in the aluminum matrix. The results revealed that the SiC particle size also affected the distribution and size of the powders in the matrix and it improved as particle size decreased from 15 µm to 30 nm. The study of mechanical properties clearly showed that a reduction in hardness of composite occurs which is attributed to positive effect of reinforcement particles in resistance to the movement of dislocations. Furthermore, it was found that the wear weight loss of Al–Cu/SiC composite decreases monotonically with increasing SiC content and more uniform particle size distribution. The excellent wear rate was primarily attributed to uniform distribution of the SiC particles.

Mechanical properties of FeAlSi powders prepared by mechanical alloying from different initial feedstock materials

2019 ◽  
Vol 107 (2) ◽  
pp. 207 ◽  
Author(s):  
Jaroslav Čech ◽  
Petr Haušild ◽  
Miroslav Karlík ◽  
Veronika Kadlecová ◽  
Jiří Čapek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Young’S Modulus ◽  
Milling Time ◽  
Young's Modulus ◽  
Element Model ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Particles ◽  
Complete Homogenization

FeAl20Si20 (wt.%) powders prepared by mechanical alloying from different initial feedstock materials (Fe, Al, Si, FeAl27) were investigated in this study. Scanning electron microscopy, X-ray diffraction and nanoindentation techniques were used to analyze microstructure, phase composition and mechanical properties (hardness and Young’s modulus). Finite element model was developed to account for the decrease in measured values of mechanical properties of powder particles with increasing penetration depth caused by surrounding soft resin used for embedding powder particles. Progressive homogenization of the powders’ microstructure and an increase of hardness and Young’s modulus with milling time were observed and the time for complete homogenization was estimated.

Effect of Temperature on the Structure and Mechanical Properties of Mechanically Alloyed Al-Nio Composite

2014 ◽  
Vol 59 (1) ◽  
pp. 121-126
Author(s):  
M. Zygmunt-Kiper ◽  
L. Blaz ◽  
M. Sugamata
Keyword(s):  
Mechanical Properties ◽  
Aluminum Oxide ◽  
Aluminum Matrix ◽  
Hot Extrusion ◽  
Effect Of Temperature ◽  
Compression Tests ◽  
Mechanically Alloyed ◽  
Structure Morphology ◽  
High Purity Aluminum ◽  
Extrusion Method

Abstract Mechanical alloying of high-purity aluminum and 10 wt.% NiO powders combined with powder vacuum compression and following hot extrusion method was used to produce an Al-NiO composite. Mechanical properties of as-extruded materials as well as the samples annealed at 823 K /6 h, were tested by compression at 293 K - 770 K. High mechanical properties of the material were attributed to the highly refined structure of the samples. It was found that the structure morphology was practically not changed during hot-compression tests. Therefore, the effect of deformation temperature on the hardness of as-deformed samples was very limited. The annealing of samples at 823 K/6 h induced a chemical reaction between NiO-particles and surrounding aluminum matrix. As a result, the development of very fine aluminum oxide and Al3Ni grains was observed.

scholarly journals Effects of Sintering Behaviors on Dimensional Accuracy, Surface Quality, and Mechanical Properties of Stereolithography-printed 3Y-ZrO2 Ceramics

2021 ◽  
Author(s):  
Cheng Zhang ◽  
Zhaoliang Jiang ◽  
Li Zhao ◽  
Weiwei Guo ◽  
Chengpeng Zhang
Keyword(s):  
Mechanical Properties ◽  
Dental Implants ◽  
Surface Quality ◽  
Dimensional Accuracy ◽  
Scanning Speed ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Air Atmosphere ◽  
Length Width ◽  
Technical Guide

Abstract Sintering process is essential to acquire the final components by stereolithography (SLA), which is a promising additive manufacturing technology for the fabrication of complex, custom-designed dental implants. 3Y-ZrO2 ceramics at different sintering behaviors in air atmosphere were successfully obtained in this study. Firstly, the curing properties of homemade pastes were studied, and the penetration depth and critical exposure of the pastes were calculated as 17.2 μm and 4.80 mJ/cm2, respectively. The green ceramic parts were performed at 154 mW laser power and 6000 mm/s scanning speed. Then, the dimensional accuracy, surface quality, and mechanical properties of 3Y-ZrO2 ceramics were investigated. The shrinkages of length, width, and height were 26%~27 %, 30%~31 %, and 27%~33 % in sintered ceramics, respectively. The Ra values of XOY, YOZ, and XOZ surfaces showed an anisotropic feature, and they were smallest as 0.52 μm, 2.40 μm, and 2.46 μm, respectively. Meanwhile, the mechanical properties presented a similar trend that they grew first and then dropped at various sintering behaviors. The optimal parameters were 1500 ℃, 60 min, and 4 ℃/min, and the maximum relative density of 96.18 %, Vickers hardness of 12.45 GPa, and fracture toughness of 6.35 MPa·m1/2 were achieved. Finally, the X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS) analysis demonstrated that no change was observed in crystal transformation and phase composition, and the organic was completely removed in sintered ceramics. This research is expected to provide a technical guide for the fabrication of ceramics for dental implants using SLA technique.

Space-holder effect on designing pore structure and determining mechanical properties in porous titanium

2014 ◽  
Vol 57 ◽  
pp. 712-718 ◽  
Author(s):  
Byounggab Lee ◽  
Taekyung Lee ◽  
Yongmoon Lee ◽  
Dong Jun Lee ◽  
Jiwon Jeong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Pore Structure ◽  
Porous Titanium ◽  
Space Holder

Development of Mechanically Alloyed and Sintered W-1 wt.% Ni Matrix Composites Reinforced with TiB2

2012 ◽  
Vol 194 ◽  
pp. 194-198 ◽  
Author(s):  
Duygu Ağaoğulları ◽  
Özge Balci ◽  
Ö. Utku Demirkan ◽  
Hasan Gökçe ◽  
Aziz Genç ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Relative Density ◽  
Physical And Mechanical Properties ◽  
Matrix Composites ◽  
Combined Method ◽  
Mechanically Alloyed ◽  
Activated Sintering ◽  
Sintering Aid ◽  
Reinforcing Agent

Due to improve the physical and mechanical properties of Ni activated W compacts, TiB2 was added to the W-Ni matrix as reinforcing agent. W-Ni matrix composites were fabricated by using a combined method of mechanical alloying (MA), cold pressing and activated sintering. The amount of activated sintering aid (Ni) was kept constant as 1 wt.%. The effects of TiB2 content and mechanical alloying duration on the physical, microstructural and mechanical properties of activated sintered W-Ni compacts were investigated. The results showed that TiB2 particles have a significant effect on the density and microhardness values of the sintered samples. After MA and sintering, formation of W2B and NiTi intermetallic compounds were observed because of the decomposition of TiB2. The relative density value of 91.21 % and microhardness value of 4.08±0.28 GPa of W-1 wt.% Ni samples respectively increased to 94.88 % and 5.64±0.28 GPa with the addition of 2 wt.% TiB2.

scholarly journals Fused Deposition Modeling of Poly (lactic acid)/Macadamia Composites—Thermal, Mechanical Properties and Scaffolds

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 258 ◽  
Author(s):  
Xiaohui Song ◽  
Wei He ◽  
Huadong Qin ◽  
Shoufeng Yang ◽  
Shifeng Wen
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Fused Deposition Modeling ◽  
Poly Lactic Acid ◽  
Porous Scaffolds ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
Structural Parts

In this work Macadamia nutshell (MS) was used as filler in fused deposition modeling (FDM) of Poly (lactic acid) (PLA) composites filaments. Composites containing MS both treated and untreated with alkali and silane were investigated by means of Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD), Thermogravimetry (TG), scanning electron microscopy (SEM). The results showed that the treated MS composites had better thermal stability. Furthermore, compression tests were carried out. The PLA with 10 wt% treated MS composite was found possessing the best mechanical properties which was almost equivalent to that of the pure PLA. Finally, porous scaffolds of PLA/10 wt% treated MS were fabricated. The scaffolds exhibited various porosities in range of 30–65%, interconnected holes in size of 0.3–0.5 mm, micro pores with dimension of 0.1–1 μm and 37.92–244.46 MPa of elastic modulus. Those values indicated that the FDM of PLA/MS composites have the potential to be used as weight lighter and structural parts.

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