scholarly journals Wire Electrical Discharge Machining, Mechanical and Tribological Performance of TiN Reinforced Multiscale SiAlON Ceramic Composites Fabricated by Spark Plasma Sintering

2021 ◽  
Vol 11 (2) ◽  
pp. 657
Author(s):  
Sergey Grigoriev ◽  
Yuri Pristinskiy ◽  
Marina Volosova ◽  
Sergey Fedorov ◽  
Anna Okunkova ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Spark Plasma Sintering ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Ceramic Composites ◽  
Second Phase ◽  
Commercial Sample ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Tin Content

An effective approach for preparing electrically conductive multiscale SiAlON-based nanocomposites with 10 wt.% and 20 wt.% of titanium nitride was developed. Fully dense samples were obtained by spark plasma sintering (SPS) at 1700 °C and 80 MPa for 30 min. The morphology of nanocomposites was observed using scanning electron microscopy and the effects of TiN particles on the mechanical properties and electrical resistivity were studied. It was found that the addition of 20 wt.% TiN increased the hardness and fracture toughness compared to the commercial ceramic analogue TC3030. Meanwhile, the presence of TiN particles reduced the flexural strength of the nanocomposites due to the shrinkage difference between TiN particles and ceramic matrix during cooling, which led to tensile residual stresses and, consequently, to changes in strength values. In addition, the electrical resistivity of nanocomposites decreased with the increase of TiN content and reached 1.6 × 10−4 Ω∙m for 20 wt.% amount of second phase, which consequently made them suitable for electrical discharge machining. In addition to enhanced mechanical and electrical properties, under identical conditions, SPS-sintered multiscale nanocomposites exhibited a higher wear resistance (more than about 1.5-times) compared to the commercial sample due to their higher toughness and hardness.

scholarly journals The Influence of Wire Electrical Discharge Machining Cutting Parameters on the Surface Roughness and Flexural Strength of ZrO2/TiN Ceramic Nanocomposites Obtained by Spark Plasma Sintering

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1391 ◽  
Author(s):  
Anton Smirnov ◽  
Anton Seleznev ◽  
Nestor Washington Solís Pinargote ◽  
Yuri Pristinskiy ◽  
Pavel Peretyagin ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Spark Plasma Sintering ◽  
Electrical Discharge ◽  
Mechanical Performance ◽  
Electrical Discharge Machining ◽  
Homogeneous Distribution ◽  
Wire Electrical Discharge Machining ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Ceramic Nanocomposites

In this work, we characterized the mechanical and electrical properties of zirconia-based ceramic nanocomposites reinforced with 30 and 40 vol. % TiN and fabricated by spark plasma sintering. In addition to their improved mechanical performance, these compositions have sufficient electrical conductivity to allow wire electrical discharge machining (WEDM). The influence of WEDM variables on the roughness and the mechanical strength of samples was analyzed after each cut. The experimental results showed that the roughness of machined surfaces can be reduced by variations in WEDM manufacturing regimes, and, consequently, a drastic drop in flexural strength of workpieces can be avoided. Furthermore, the composites with higher content and homogeneous distribution of the conductive phase exhibited better surface quality as well.

scholarly journals Effect of Nano-Y2O3 Addition on Microstructure and Tensile Properties of High-Nb TiAl Alloy Prepared by Spark Plasma Sintering

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1048
Author(s):  
Yingchao Guo ◽  
Yongfeng Liang ◽  
Junpin Lin ◽  
Fei Yang
Keyword(s):  
Tensile Strength ◽  
Spark Plasma Sintering ◽  
Tial Alloy ◽  
Second Phase ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Y2o3 Addition ◽  
Powder Metallurgy Route

Nano-Y2O3 reinforced Ti-47.7Al-7.1Nb-(V, Cr) alloy was fabricated by a powder metallurgy route using spark plasma sintering (SPS), and the influence of nano-Y2O3 contents on the microstructure and mechanical properties were investigated systematically. The results revealed that the ultimate tensile strength and elongation of the alloy were 570 ± 28 MPa and 1.7 ± 0.6% at 800 °C, 460 ± 23 MPa and 6.1 ± 0.4% at 900 °C with no nano-Y2O3, 662 ± 24 MPa and 5.5 ± 0.5% at 800 °C, and 466 ± 25 MPa and 16.5 ± 0.8% at 900 °C with 0.05 at% nano-Y2O3 addition, respectively. Due to the fine-grain strengthening and the second-phase strengthening, both tensile strength and elongation of the high-Nb TiAl alloy were enhanced with the addition of nano-Y2O3.

Spark plasma sintering of graphene reinforced zirconium diboride ultra-high temperature ceramic composites

2013 ◽  
Vol 39 (6) ◽  
pp. 6637-6646 ◽  
Author(s):  
Govindaraajan B. Yadhukulakrishnan ◽  
Sriharsha Karumuri ◽  
Arif Rahman ◽  
Raman P. Singh ◽  
A. Kaan Kalkan ◽  
...  
Keyword(s):  
High Temperature ◽  
Spark Plasma Sintering ◽  
Zirconium Diboride ◽  
Ceramic Composites ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Ultra High Temperature

Nonstoichiometric Composition and Densification of CaRuO3 by SPS

2007 ◽  
Vol 352 ◽  
pp. 251-254 ◽  
Author(s):  
Nittaya Keawprak ◽  
Rong Tu ◽  
Takashi Goto
Keyword(s):  
Spark Plasma Sintering ◽  
Single Phase ◽  
Lattice Parameters ◽  
Second Phase ◽  
Nonstoichiometric Composition ◽  
Plasma Sintering ◽  
Spark Plasma

Calcium ruthenates were prepared in different ratios of Ru to Ca (RRu/Ca = 0.5～1.4) by spark plasma sintering. CaRuO3 in a single phase was obtained at RRu/Ca = 1.0. At RRu/Ca < 1.0, a mixture of CaRuO3 and CaO was obtained, whereas CaRuO3 with second phase of RuO2 was obtained at RRu/Ca > 1.0. The density at RRu/Ca < 1.0 were 80-85% and slightly increased with increasing RRu/Ca. The density significantly increased up to 95% with increasing RRu/Ca from 1.1 to 1.4, suggesting that the second phase of RuO2 was effective to densify CaRuO3. The density of CaRuO3 in a single phase was 82% at most. The lattice parameters of CaRuO3 decreased with increasing RRu/Ca from 0.7 to 1.0, showing a nonstoichiometric range of Ca1+δRuO3+δ.

Fabrication of MgO/Graphene Composites by Combustion Synthesis and Spark Plasma Sintering

2018 ◽  
Vol 281 ◽  
pp. 125-130
Author(s):  
Nan Lu ◽  
Jia Xi Liu ◽  
Gang He ◽  
Jiang Tao Li
Keyword(s):  
Mechanical Properties ◽  
Combustion Synthesis ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Ceramic Composites ◽  
Combustion Reaction ◽  
Sintering Additive ◽  
Microstructure And Mechanical Properties ◽  
Plasma Sintering ◽  
Spark Plasma

MgO/Graphene ceramic composites were fabricated by combining combustion synthesis with spark plasma sintering. MgO/Graphene mixture powders were prepared by the combustion reaction between Mg powders and CO2 gas. Dense MgO/Graphene composites were fabricated by spark plasma sintering (SPS) using LiF as the sintering additive. The effect of the sintering temperature on microstructure and mechanical properties of the prepared MgO/Graphene ceramics was discussed. The sintering temperature of the MgO/Graphene mixture powders increased from 900°C to 1300°C. The highest density of 3.43g/cm3 and hardness of 2133MPa were obtained at 1100°C. Compared with monolithic MgO ceramics, the hardness of MgO/Graphene ceramics at the same sintering temperature was increased from 840MPa to 2133MPa.

3C4 Fabrication of high strength steel-ceramic composites by using spark plasma sintering

2013 ◽  
Vol 2013 (0) ◽  
pp. 93-94
Author(s):  
Takuya Nakamura ◽  
Shinji Taguchi ◽  
Kousei Ijichi ◽  
Yoshikazu Maeda ◽  
Ayako Nagase ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
High Strength Steel ◽  
High Strength ◽  
Ceramic Composites ◽  
Plasma Sintering ◽  
Spark Plasma
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