Microstructure and Properties of the Composite on the Basis of Copper and Diamond

2016 ◽  
Vol 685 ◽  
pp. 607-610 ◽  
Author(s):  
Aleksander S. Ivashutenko ◽  
Nikita V. Martyushev ◽  
Yuriy Yu. Drozdov
Keyword(s):  
Spark Plasma Sintering ◽  
Heat Conductivity ◽  
Pure Copper ◽  
Three Dimensional ◽  
Diamond Powder ◽  
Heat Conducting ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Composite Heat ◽  
Sps Sintering

The paper presents the experimental material on obtaining and researching of three-dimensional composite heat-conducting copper-diamond materials in the system of spark plasma sintering. Earlier [1-5], it was established that in order to achieve the effect of the increased heat conductivity of a composite it is necessary to create the conditions hindering the movement of heat flux on the interface boundary. In this work we have attempted to obtain the material with heat conductivity higher than that of pure copper due to addition of diamond powder and synthesis of the composite in the system of spark plasma sintering. For comparison, we have considered copper and diamond compositions in the ratios of 50/50 and 40/60 correspondingly. The results of the heat conductivity analysis have not exceeded the indices of pure copper; however, according to SEM data, it has been found that at SPS-sintering local domains with enhanced adhesion form on the surfaces of diamonds.

The Additives Influence on Heat-Conducting Properties of Aluminium Nitride Circuit Boards

2016 ◽  
Vol 712 ◽  
pp. 226-231
Author(s):  
A.S. Karakulov ◽  
N.V. Gusev ◽  
Yuriy Yu. Drozdov ◽  
N.Y. Nikonova
Keyword(s):  
Spark Plasma Sintering ◽  
Heat Conductivity ◽  
Ball Mill ◽  
Aluminium Nitride ◽  
Heat Conducting ◽  
Circuit Boards ◽  
Plasma Sintering ◽  
Nitride Ceramics ◽  
Spark Plasma ◽  
Conductive Properties

The paper presents the studies on evaluation of the influence of modified additives of Y2O3-, ZrO2- and Li2O3-type on heat-conductive properties of aluminium-nitride ceramics used as circuit boards. Sintering of the studied samples was carried out using AlN powders and the powders of the modifying additives, mixed in the ball mill based on the spark plasma sintering system “SPS”. Density and heat conductivity were measured for the obtained samples. It was ascertained that the most significant level of heat conductivity was obtained when using the additive mixture made of 7 wt. % of Li2O3 and 3wt. % of Y2O3, which reaches the level of 160 W/m·K. In addition, the results of the studies show that the addition of the modified powders leads to a significant increase of density; the additive consisting of 7wt.% of Li2O3 and 3wt.% of Y2O3 produces the greatest effect.

Improvements on the Properties of the In Situ MgB2/Fe Tapes Annealed by Spark Plasma Sintering Technique

2007 ◽  
Vol 546-549 ◽  
pp. 2059-2062
Author(s):  
Lin Ma ◽  
Hong Li Suo ◽  
Ying Wang ◽  
Hong Xia Ma ◽  
Min Liu ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Vacuum Condition ◽  
Vacuum Furnace ◽  
Sintering Process ◽  
Sintering Mechanism ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Powder In Tube ◽  
Sps Sintering

In-situ MgB2/Fe tapes were fabricated by the powder in tube (PIT) technology using Mg and B powders. The tapes were sintered by both an advanced spark plasma sintering (SPS) and a conventional vacuum furnace, respectively. The effects of these two sintering routes on the properties of the MgB2 tapes were investigated by the analysis of XRD, SEM and the magnetic Jc measurements. It was shown that at 10K, 0T, the magnetic Jc value of the tape sintered using SPS machine at 800°C for 15min under 30MPa were close to 106A/cm2, which was higher than that of the tapes annealed at 700°C for 2h under pressureless vacuum condition. It was found that the density and the homogeneity of the MgB2 core were strongly improved using SPS sintering process, which explained why the MgB2 tapes sintered by SPS method have a higher Jc value. Further enhancement of Jc in the tapes is expected for the understanding of the SPS sintering mechanism.

scholarly journals Dielectric and Ferroelectric Studies on High Dense Pb(Zr0.52Ti0.48)O3 Nanocrystalline Ceramics by High Energy Ball Milling and Spark Plasma Sintering

Ceramics ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 13-24 ◽  
Author(s):  
Venkata Ramana Mudinepalli ◽  
Feng Leng
Keyword(s):  
Dielectric Constant ◽  
Spark Plasma Sintering ◽  
Microwave Sintering ◽  
High Energy ◽  
Pzt Ceramics ◽  
Plasma Sintering ◽  
Structural And Electrical Properties ◽  
Conventional Sintering ◽  
Spark Plasma ◽  
Sps Sintering

In our previous work, we synthesized Pb(Zr0.52Ti0.48)O3 (PZT) ceramics by conventional and microwave sintering methods and studied their structural and electrical properties. We observed that the microwave sintered PZT ceramics show higher densification, fine and uniform grain size, higher dielectric constant, remnant polarization (Pr), and spontaneous polarization (Ps) in comparison to conventional sintered ones. In the present work, we studied the microstructure, phase formation, dielectric, ferroelectric and piezoelectric properties of the PZT ceramics synthesized by using Spark plasma Sintering (SPS) method. The SPS sintering temperature is lower (300 to 400 °C) than both conventional and microwave sintering methods. The dielectric constant at room temperature and at transition temperature shows higher values compared to the microwave and conventional sintering methods. This SPS sintering technique is currently attracting growing attention among productions engineers and materials researchers.

scholarly journals Elaboration of Architectured Materials by Spark Plasma Sintering

2012 ◽  
Vol 706-709 ◽  
pp. 1885-1892 ◽  
Author(s):  
Damien Fabrègue ◽  
Bassem Mouawad ◽  
Cyril Buttay ◽  
Maher Soueidan ◽  
Aude Lamontagne ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Pure Copper ◽  
Physical Processes ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Innovative Materials ◽  
Architectured Materials ◽  
Short Time

Spark plasma sintering has been used for decades in order to consolidate a wide variety of materials and permitting to obtain fully dense specimens. This technique has been mainly applied to ceramics. This paper concentrates on an unusual use of spark plasma sintering system: obtaining innovative materials especially architectured ones. Different applications are presented. Firstly, the SPS technique has been used to elaborate nanometers grain size materials or containing nanoscale microstructure. This is possible since the sintering temperature and the holding time are far lower in the SPS compared to other techniques. Then SPS has been used to realize diffusion bonding. In that case again, bonding can be realized at low temperature and for short time. It permits for example to realize bonding between two copper layers which is of a great importance for microelectronic applications. It is worth noting that this bonding can have the same mechanical strength as pure copper even for diffusion time of a few minutes. Secondly, bonding has been also carried out between a metallic layer and a ceramic one. This could lead to design of new layered materials combining interesting properties in terms of mechanical strength but also in terms of electrical resistance. The SPS machine has also been used to obtain porous materials (cobalt alloys or copper) with an adapted microstructure (porosity, tortuosity,). These structures could open new perspectives for biomedical or for microelectronic applications. All these examples lead to a better understanding of the physical processes which happen during spark plasma sintering.

Harmonic Structured Ti6Al4V by Spark Plasma Sintering

2017 ◽  
Vol 899 ◽  
pp. 452-457 ◽  
Author(s):  
Lucas de Mello Amorim ◽  
Nério Vicente Jr. ◽  
Marcos Antonio Coelho Berton ◽  
Cláudia Eliana Bruno Marino
Keyword(s):  
Chemical Composition ◽  
Spark Plasma Sintering ◽  
Three Dimensional ◽  
Beta Phase ◽  
Harmonic Structure ◽  
Electrode Processes ◽  
Plasma Sintering ◽  
Dimensional Network ◽  
Spark Plasma ◽  
Microstructure Morphology

The Ti6Al4V alloy has been applied in situations where mechanical strength, corrosion resistance and biocompatibility are the concern, as in permanent biomedical implants. These material properties are straightly correlated with the microstructure morphology as grain size and crystallographic phases, which is very dependent of the thermal mechanical history and the chemical composition. The Ti6Al4V harmonic structure was primarily achieved by means of Mechanical Ball Milling (MBM) and Spark Plasma Sintering (SPS) using pre-alloyed powder from the plasma rotating electrode processes (PREP). This work aimed at developing the harmonic microstructure by MBM and SPS using pre-alloyed gas atomized powder (GAP). The chemical composition, the microstructure and the hardness were evaluated for the sintered samples and for the commercial wrought annealed conditions, for comparison. The harmonic structure obtained consists of cores containing alpha lath coarse grains surrounded by a three-dimensional network of fine equiaxial grains, while the wrought material shows equiaxial alpha grains in a matrix of beta phase microstructure. The sintered material revealed higher hardness than the wrought alloy.

scholarly journals Mechanism of Carbon Contamination in Transparent MgAl2O4 and Y3Al5O12 Ceramics Sintered by Spark Plasma Sintering

Ceramics ◽  
2019 ◽  
Vol 2 (4) ◽  
pp. 612-619 ◽  
Author(s):  
Hussein Hammoud ◽  
Vincent Garnier ◽  
Gilbert Fantozzi ◽  
Etienne Lachaud ◽  
Solène Tadier
Keyword(s):  
Optical Properties ◽  
Spark Plasma Sintering ◽  
Carbon Clusters ◽  
Graphite Foil ◽  
Raman Analysis ◽  
Carbon Contamination ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
And Diffusion ◽  
Sps Sintering

An investigation of MgAl2O4 spinel and Y3Al2O5 (YAG) materials sintered by spark plasma sintering (SPS) was performed. The optical properties of the materials are modified depending on the powder source and the SPS sintering conditions. Spectrophotometer and Raman analysis are presented in this work, along with optical and scanning electron microscope (SEM) observations and cathodoluminescence analysis. The results show a correlation between carbon contamination and the optical properties of the materials. Herein, the source of the contamination is explained, along with its genesis and diffusion. The carbon contamination originates from the powder itself (carbonates), as well as the SPS environment (papiex® graphite foil, graphite die, graphite felt) to form carbon clusters. During the high-temperature SPS process, carbon from those carbon clusters diffuses, resulting in an increase in the contamination volume, thereby increasing the light absorption.

The Potential of Spark Plasma Sintering (SPS) Method for the Fabrication on an Industrial Scale of Functionally Graded Materials

2010 ◽  
Vol 63 ◽  
pp. 322-331 ◽  
Author(s):  
Masao Tokita
Keyword(s):  
Spark Plasma Sintering ◽  
Three Dimensional ◽  
Historical Review ◽  
High Heat ◽  
Industrial Applications ◽  
Functionally Graded ◽  
Sintered Compact ◽  
Plasma Sintering ◽  
Key Factor ◽  
Spark Plasma

<span><span style="font-family: Times New Roman;">Functionally Grated Materials (FGMs) have usually been expected as candidates for a wide variety of industrial applications due to their desirable properties such as high heat resistance capability, good wear resistance, bio-compatibility, chemical stability and so on. Scaling-up and three dimensional (3-D) near-net shape forming technique for FGMs are one of the most important key-factor to produce the industrial engineering components and products in practical use. On the other hand, it is generally well known that the Spark Plasma Sintering (SPS) method is a novel process to produce homogeneous FGMs, nano-structural sintered compact, thermoelectric semiconductors and bio-medical materials in shorter sintering time with finer microstructure. This paper will present development of FGMs fabricated by SPS and future prospects of SPS on research and industrialization activities in Japan. A brief historical review progress of SPS technology is also given and the applicable field is exemplified. Then, the paper is focused on manufacturing processes on FGM by SPS technology. </span>

Obtaining Intermetallic Compound Copper-Tin: Plasma Dynamic Synthesis and Spark Plasma Sintering

2017 ◽  
Vol 743 ◽  
pp. 25-30
Author(s):  
Alexander Sivkov ◽  
Alexander Ivashutenko ◽  
Yuliya Shanenkova ◽  
Ivan Shanenkov ◽  
Yuliya Polovinkina
Keyword(s):  
Intermetallic Compound ◽  
Spark Plasma Sintering ◽  
Pure Copper ◽  
Wear Area ◽  
Plasma Dynamic ◽  
Copper Electrodes ◽  
Dynamic Synthesis ◽  
Plasma Sintering ◽  
Transmission Electron ◽  
Spark Plasma

The intermetallic compound tin-copper (Cu-Sn) is widely used in the creation of high-quality bearings, electric conductive lubricants, 3D printers. However, when connecting two metals, the bond between atoms in the lattice becomes covalent or ionic. This leads to the fact that the material becomes more brittle. Additionally, the production of intermetallic compounds is cost-based in terms of both material resources and money. In this paper, the ceramics has been sintered based on the intermetallic copper-tin powders, obtained by plasma dynamic method. The raw powdered materials based on Cu-Sn were obtained using a coaxial magnetoplasma accelerator with copper electrodes by adding the crushed tin into the accelerator. Using X-ray diffractometry (XRD) and transmission electron microscopy (TEM) analyses, the presence of such phases as copper Cu and tin-copper Cu41Sn11 in the obtained material has been confirmed. Further, such-synthesized powdered products were used to obtain bulk samples using the spark plasma sintering technology at various sintering parameters. Images from scanning electron microscope showed a uniform sintering of the product at the sintering temperature of 440 °C under a pressure of 60 MPa. It was found that the sintered intermetallic ceramics has the Vickers hardness equal to 120 Hv. The obtained sample has the lower friction coefficient and the smaller wear area in comparison with the sample, made of pure copper.

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