scholarly journals Mechanical Properties and Corrosion Resistance of Magnesium–Hydroxyapatite Composites Fabricated by Spark Plasma Sintering

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1314
Author(s):  
Ikuho Nakahata ◽  
Yusuke Tsutsumi ◽  
Equo Kobayashi
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Compressive Strength ◽  
Corrosion Resistance ◽  
Spark Plasma Sintering ◽  
Immersion Test ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Mechanical Properties And Corrosion ◽  
Biodegradable Magnesium

Recent studies indicate that biodegradable magnesium alloys and composites are attracting a great deal of attention in orthopedic applications. In this study, magnesium–hydroxyapatite (Mg–HAP) composites with different compositions and grain size were fabricated by a spark plasma sintering (SPS) method. Their mechanical properties and corrosion behavior in a pseudo-physiological environment were investigated by pH measurements and inductivity coupled plasma (ICP) elemental analysis after an immersion test using Hanks’ solution. The results clearly showed that the addition of HAP improved both the mechanical properties and corrosion resistance. The results also indicated that the finer grain size improved most of the properties that are needed in a material for an orthopedic implant. Furthermore, the authors reveal that there is a strong correlation between the compressive strength and the porosity. In order to achieve the same compressive strength as human bone using these fabrication conditions, it is revealed that the porosity should be lower than 1.9%.

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Nanocrystalline Aluminum 5083 Alloy

2015 ◽  
Vol 782 ◽  
pp. 113-118
Author(s):  
Ying Mei Teng ◽  
Zhao Hui Zhang ◽  
Zi Zhou Yuan
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Compressive Strength ◽  
Sintering Temperature ◽  
Initial Pressure ◽  
Fine Grain ◽  
Microstructure And Mechanical Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Bulk Nanocrystalline

The bulk nanocrystalline (NC) aluminum (Al) 5083 was synthesized by spark plasma sintering (SPS) technique with low initial pressure of 1 MPa, high holding pressure of 300 MPa and holding time of 4 min at different sintering temperatures, using surface passivated nanopowders. The effect of sintering temperature on microstructure and mechanical properties of the bulk NC Al 5083 were investigated. Results indicate that the density, grain size, the hardness and the compressive strength of the bulk NC Al 5083 increase with an increase in sintering temperature. The mechanical properties of the material are greatly improved due to the fine grain size. The bulk NC Al 5083 sintered at 723 K has the highest micro-hardness of 2.37 GPa and the best compressive strength of 845 MPa.

Mechanical Properties of Cu-Based Amorphous Alloy Matrix Composites Consolidated by Spark Plasma Sintering

2008 ◽  
Author(s):  
Duk-Hyun Nam ◽  
Chang-Young Son ◽  
Chang Kyu Kim ◽  
Sunghak Lee
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Amorphous Alloy ◽  
Plastic Strain ◽  
Spark Plasma Sintering ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Pure Cu

In this study, microstructure and mechanical properties of Cu-based amorphous alloy matrix composites consolidated by spark plasma sintering (SPS) equipment were investigated. Amorphous alloy powders were mixed with 10∼40 vol.% of pure Cu powders, and were consolidated at 460°C for 1/2 minute under 300 or 700 MPa. The consolidated composites contained Cu particles homogeneously distributed in the amorphous matrix, and showed a considerable plastic strain, whereas their compressive strength was lower than that of the monolithic amorphous alloys. The compressive strength and plastic strain of the composites consolidated under 700 MPa showed 10∼20% and two times increases, respectively, over those of the composites consolidated under 300 MPa. The increase in consolidation pressure could play a role in sufficiently bonding between prior amorphous powders, in preventing micropores, and in suppressing the crystallization, thereby leading to the successful consolidation of the high-quality composites. Microfracture mechanisms were investigated by directly observing microfracture processes using an in situ loading stage. Cu particles present in the composites acted as blocking sites of crack propagation, and provided the stable crack growth. These findings suggested that the composites consolidated by the SPS presented new possibilities of application to structural materials or parts requiring excellent mechanical properties and large sizes.

Ultrafine WC-Ni-SiCw Cemented Carbides Fabricated by Spark Plasma Sintering

2012 ◽  
Vol 512-515 ◽  
pp. 924-927
Author(s):  
Hui Yong Rong ◽  
Zhi Jian Peng ◽  
Xiao Yong Ren ◽  
Ying Peng ◽  
Cheng Biao Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Flexural Strength ◽  
Spark Plasma Sintering ◽  
Cemented Carbides ◽  
Plasma Sintering ◽  
Mean Grain Size ◽  
Spark Plasma ◽  
The Mean ◽  
Inhomogeneous Microstructure

Ultrafine WC-Ni cemented carbides with addition of SiC whisker (SiCw) were fabricated by spark plasma sintering. The microstructure and mechanical properties of the fabricated cemented carbides were investigated. It was found that the addition of SiC whisker had no obvious influence on the phase compositions of the cemented carbides, but the mean grain size of the cemented carbides decreased as the addition fraction of SiC whisker increased. The fabricated WC-Ni cemented carbides presented the highest hardness when 0.75 wt% SiC whisker was added. However, the addition of SiC whisker was detrimental to the flexural strength of the cemented carbides because of the formation of inhomogeneous microstructure in the WC-Ni cemented carbides.

scholarly journals Effect of the Heating Rate on the Spark-Plasma-Sintering (SPS) of Transparent Y2O3 Ceramics: Microstructural Evolution, Mechanical and Optical Properties

Ceramics ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 56-69
Author(s):  
Lihong Liu ◽  
Koji Morita ◽  
Tohru S. Suzuki ◽  
Byung-Nam Kim
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Heating Rate ◽  
Spark Plasma Sintering ◽  
Near Infrared ◽  
Slow Heating ◽  
High Heating Rate ◽  
Plasma Sintering ◽  
High Heating ◽  
Spark Plasma

High strength transparent Y2O3 ceramics were fabricated from commercial powders using spark plasma sintering (SPS) technique by optimizing the heating rate. The heating rate significantly influenced the microstructures and the optical/mechanical properties of the Y2O3 ceramics. Grain growth was limited accordingly with increasing the heating rate. The ball milling process of the commercial Y2O3 powders is likely to further enhance the sinterability during the SPS processing. The dense Y2O3 ceramics, which were sintered by SPS with 100 °C/min, showed good transmittance range from visible to near infrared (IR). For a high heating rate of 100 °C/min, the in-line transmittance at a visible wavelength of 700 nm was 66%, whereas for a slow heating rate of 10 °C/min, it reduced to 46%. The hardness Hv tends to increase with increasing the heating rate and rigorously followed the Hall–Petch relationship; that is, it is enhanced with a reduction of the grain size. The toughness KIC, on the other hand, is less sensitive to both the heating rate and the grain size, and takes a similar value. This research highlighted that the high heating rate SPS processing can fabricate fully dense fine-grained Y2O3 ceramics with the excellent optical and mechanical properties.

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