scholarly journals EDM processing of sintered ceramic materials using the SPS method

Mechanik ◽  
2018 ◽  
Vol 91 (3) ◽  
pp. 240-243
Author(s):  
Andrzej Nowakowski ◽  
Tadeusz Krzywda ◽  
Piotr Putyra
Keyword(s):  
Electrical Conductivity ◽  
Ceramic Composite ◽  
Physical And Mechanical Properties ◽  
Ceramic Materials ◽  
Sintered Ceramic ◽  
Electro Discharge Machining ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Si3n4 Matrix ◽  
Sintering Method

Presented are the analysis of physical and mechanical properties of the Al2O3, SiC and Si3N4 matrix ceramics with additives of good electrical conductivity phases and TiB2 matrix ceramics. The density, Young’s modulus, hardness HV1 and electrical conductivity of each material were investigated. Ceramic composite materials with the participation of the conductive phases have been produced using SPS (spark plasma sintering) method. Materials characterized by good electrical conductivity were shaped using EDM (electro discharge machining) method.

scholarly journals Electrodischarge machining of silicon nitride composites and silicon carbide composites

Mechanik ◽  
2019 ◽  
Vol 92 (2) ◽  
pp. 115-118
Author(s):  
Andrzej Nowakowski ◽  
Piotr Putyra ◽  
Tadeusz Krzywda
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Silicon Carbide ◽  
Ceramic Composite ◽  
Physical And Mechanical Properties ◽  
Electro Discharge Machining ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Ceramic Composite Materials ◽  
Sintering Method

The paper presents the results of physical and mechanical properties of the and Si3N4 and SiC matrix ceramics with additives of good electrical conductivity carbides, nitrides and borides phases. The density, Young’s modulus, hardness HV1 and electrical conductivity of each material were investigated. Ceramic composite materials with the participation of the conductive phases have been produced using SPS (spark plasma sintering) method. Materials characterized by good electrical conductivity were shaped using EDM (electro discharge machining) method.

Thermoelectrical properties of α phase and γ phase NaxCo2O4 ceramics prepared by spark plasma sintering method

2013 ◽  
Vol 1490 ◽  
pp. 57-62 ◽  
Author(s):  
Natsuko Mikami ◽  
Keishi Nishio ◽  
Koya Arai ◽  
Tatsuya Sakamoto ◽  
Masahiro Minowa ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Spark Plasma Sintering ◽  
Figure Of Merit ◽  
Dimensionless Figure Of Merit ◽  
Α Phase ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Method ◽  
Acid Compound

ABSTRACTThe thermoelectrical properties of α and γ phases of NaxCo2O4 having different amounts of Na were evaluated. The γ NaxCo2O4 samples were synthesized by thermal decomposition in a metal-citric acid compound, and the α NaxCo2O4 samples were synthesized by self-flux processing. Dense bulk ceramics were fabricated using spark plasma sintering (SPS), and the sintered samples were of high density and highly oriented. The thermoelectrical properties showed that γ NaxCo2O4 had higher electrical conductivity and lower thermal conductivity compared with α NaxCo2O4 and that α NaxCo2O4 had a larger Seebeck coefficient. These results show that γ NaxCo2O4 has a larger power factor and dimensionless figure of merit, ZT, than α NaxCo2O4.

scholarly journals Methods to improve mechanical characteristics of ceramics on the basis of zirconium and hafnium diborides (Review)

2020 ◽  
Vol 10 (2) ◽  
pp. 180-190
Author(s):  
Ekaterina N. Portnova
Keyword(s):  
Crack Resistance ◽  
Mechanical Characteristics ◽  
Sintered Material ◽  
Ceramic Materials ◽  
Second Phase ◽  
Ceramic Samples ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Powder Particles ◽  
Sintering Method

This paper describes the main methods for improving the mechanical properties of ceramic materials based on zirconium and hafnium diborides, such as strength and crack resistance. Particular attention is paid to the influence of the sintering method, as well as additives introduced into the powder composition, in particular hard fibers, second-phase powder particles and “whiskers”, on the mechanical characteristics of the ceramics. On the basis of the analysis of literature data, it is shown that the spark plasma sintering (SPS) method allows to obtain ceramic samples with increased mechanical characteristics due to their high density and low defects. The addition of silicon carbide filamentous crystals or fibers to the ceramics can increase the crack resistance of the sintered material up to 6.0–8.5 MPa×m1/2. These conclusions can be useful in the development of ultra-high-temperature ceramic materials.

Analysis of the Mechanisms of Cracking Selected Transition Metal Carbides

2015 ◽  
Vol 655 ◽  
pp. 62-67
Author(s):  
Pawel Figiel ◽  
Piotr Wyzga ◽  
Jolanta Laszkiewicz-Lukasik ◽  
Kamil Wojteczko ◽  
Marcin Podsiadlo
Keyword(s):  
Fracture Toughness ◽  
Physical And Mechanical Properties ◽  
Tantalum Carbide ◽  
Metal Carbides ◽  
Sintering Time ◽  
Plasma Sintering ◽  
Structural Applications ◽  
Cracking Mechanisms ◽  
Spark Plasma ◽  
Sintering Method

Fracture toughness is one of the basic properties that determine the usefulness of these materials for structural applications. In this work, an analysis of cracking mechanism and measuring the fracture toughness of selected carbides: NbC, TaC and ZrC were carried out. Tested materials were sintered using Spark Plasma Sintering method (SPS), at 2200 °C, under a pressure of 35 MPa. Sintering time was 5 and 30 min. Commercial powders were used, with a particle size in the range from 1 to 6 microns. The powders were sintered without the addition of sintering activators.Additionally selected physical and mechanical properties have been investigated: apparent density (Archimedes method), Young's modulus (ultrasonic) and hardness (Vickers). The cracking mechanisms analysis was carried out using Scanning Electron Microscopy (SEM). Studies have shown that the highest fracture toughness, about 5.35 MPa·m1/2, characterized tantalum carbide, sintered at 2200 °C for 5 min. TaC also had the highest resistance to the formation of chipping around the Vickers indentation.

Microstructure and Mechanical Properties of Spark Plasma Sintered ZrO2-Al2O3-TiC0.5N0.5 Nanocomposites

2005 ◽  
Vol 106 ◽  
pp. 153-160 ◽  
Author(s):  
Kim Vanmeensel ◽  
K.Y. Sastry ◽  
J. Hennicke ◽  
Guy Anné ◽  
Dongtao Jiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Fracture Toughness ◽  
Powder Processing ◽  
Processing Technique ◽  
Conductive Composites ◽  
Processing Times ◽  
Electro Discharge Machining ◽  
Plasma Sintering ◽  
Spark Plasma

Future materials for wear resistant components require a combination of excellent mechanical properties such as hardness and toughness, short processing times and good electrical conductivity to facilitate shaping by electro discharge machining (EDM). In this work, the hardness and fracture toughness of t-ZrO2 based electro conductive composites was optimised, while short processing times below 20 minutes using spark plasma sintering were sufficient to obtain near fully dense materials. The influence of powder processing technique using TiC0.5N0.5 as the starting powder and yttria as a stabiliser on the mechanical properties of ZrO2-TiC0.5N0.5-Al2O3 based composites was investigated. Fully dense Y-TZP based composites possessed an excellent toughness of 9.2 MPa.m1/2 and an increased Vickers hardness of 1397 kg/mm².

An Application of Spark Plasma Sintering for Compaction of Refractory Oxides and Nitrides

2015 ◽  
Vol 756 ◽  
pp. 225-229
Author(s):  
S.V. Matrenin ◽  
Boris Ovechkin ◽  
R.V. Tayukin
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Spark Plasma Sintering ◽  
Physical And Mechanical Properties ◽  
Ceramic Materials ◽  
Aluminum Oxynitride ◽  
Resistance Furnace ◽  
Refractory Oxides ◽  
Plasma Sintering ◽  
Spark Plasma

The results of investigation of physical and mechanical properties of ceramic materials manufactured by compaction of alumina, zirconia, and aluminum oxynitride powders using spark plasma sintering (SPS) are presented. It is found out that the ceramics thus produced exhibit improved density and microhardness compared to the materials sintered at high temperature in a resistance furnace.

scholarly journals Development of DLC-Coated Solid SiAlON/TiN Ceramic End Mills for Nickel Alloy Machining: Problems and Prospects

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 532
Author(s):  
Sergey N. Grigoriev ◽  
Marina A. Volosova ◽  
Sergey V. Fedorov ◽  
Anna A. Okunkova ◽  
Petr M. Pivkin ◽  
...  
Keyword(s):  
Nickel Alloy ◽  
Spark Plasma Sintering ◽  
Physical And Mechanical Properties ◽  
Sintered Ceramic ◽  
Dlc Coatings ◽  
Powder Composition ◽  
Plasma Sintering ◽  
End Mills ◽  
Spark Plasma ◽  
Quantitative Indicators

The study is devoted to the development and testing of technological principles for the manufacture of solid end mills from ceramics based on a powder composition of α-SiAlON, β-SiAlON, and TiN additives, including spark plasma sintering powder composition, diamond sharpening of sintered ceramic blanks for shaping the cutting part of mills and deposition of anti-friction Si-containing diamond-like carbon (DLC) coatings in the final stage. A rational relationship between the components of the powder composition at spark plasma sintering was established. The influence of optimum temperature, which is the most critical sintering parameter, on ceramic samples’ basic physical and mechanical properties was investigated. DLC coatings’ role in changing the surface properties of ceramics based on SiAlON, such as microrelief, friction coefficient, et cetera, was studied. A comparative analysis of the efficiency of two tool options, such as developed samples of experimental mills made of SiAlON/TiN and commercial samples ceramic mills based on SiAlON, doped with stabilizing additives containing Yb when processing nickel alloys (NiCr20TiAl alloy was used as an example). DLC coatings’ contribution to the quantitative indicators of the durability of ceramic mills and the surface quality of machined products made of nickel alloy is shown.

scholarly journals Enhancement of Electrical Conductivity of Aluminum-Based Nanocomposite Produced by Spark Plasma Sintering

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1150
Author(s):  
Nicolás A. Ulloa-Castillo ◽  
Roberto Hernández-Maya ◽  
Jorge Islas-Urbano ◽  
Oscar Martínez-Romero ◽  
Emmanuel Segura-Cárdenas ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Spark Plasma Sintering ◽  
Experimental Tests ◽  
Powder Morphology ◽  
Plasma Sintering ◽  
Multi Walled Carbon Nanotubes ◽  
Spark Plasma ◽  
Ball Milling Technique ◽  
Walled Carbon Nanotubes

This article focuses on exploring how the electrical conductivity and densification properties of metallic samples made from aluminum (Al) powders reinforced with 0.5 wt % concentration of multi-walled carbon nanotubes (MWCNTs) and consolidated through spark plasma sintering (SPS) process are affected by the carbon nanotubes dispersion and the Al particles morphology. Experimental characterization tests performed by scanning electron microscopy (SEM) and by energy dispersive spectroscopy (EDS) show that the MWCNTs were uniformly ball-milled and dispersed in the Al surface particles, and undesirable phases were not observed in X-ray diffraction measurements. Furthermore, high densification parts and an improvement of about 40% in the electrical conductivity values were confirmed via experimental tests performed on the produced sintered samples. These results elucidate that modifying the powder morphology using the ball-milling technique to bond carbon nanotubes into the Al surface particles aids the ability to obtain highly dense parts with increasing electrical conductivity properties.

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