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.

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.

Production of Dispersion-Strengthened Cu-TiB2 Alloys by Ball-Milling and Spark-Plasma Sintering

2007 ◽  
Vol 534-536 ◽  
pp. 1489-1492 ◽  
Author(s):  
Dae Hwan Kwon ◽  
Jong Won Kum ◽  
Thuy Dang Nguyen ◽  
Dina V. Dudina ◽  
Pyuck Pa Choi ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Ball Milling ◽  
Spark Plasma Sintering ◽  
Ball Mill ◽  
Milling Time ◽  
Rotation Speed ◽  
Sintering Temperature ◽  
Milled Powder ◽  
Plasma Sintering ◽  
Spark Plasma

Dispersion-strengthened copper with TiB2 was produced by ball-milling and spark plasma sintering (SPS).Ball-milling was performed at a rotation speed of 300rpm for 30 and 60min in Ar atmosphere by using a planetary ball mill (AGO-2). Spark-plasma sintering was carried out at 650°C for 5min under vacuum after mechanical alloying. The hardness of the specimens sintered using powder ball milled for 60min at 300rpm increased from 16.0 to 61.8 HRB than that of specimen using powder mixed with a turbular mixer, while the electrical conductivity varied from 93.40% to 83.34%IACS. In the case of milled powder, hardness increased as milling time increased, while the electrical conductivity decreased. On the other hand, hardness decreased with increasing sintering temperature, but the electrical conductiviey increased slightly

Spark plasma sintering of aluminium nitride transparent ceramics

2004 ◽  
Vol 20 (9) ◽  
pp. 1097-1099 ◽  
Author(s):  
Z.Y. Fu ◽  
J.F. Liu ◽  
H. Wang ◽  
D.H. He ◽  
Q.J. Zhang
Keyword(s):  
Spark Plasma Sintering ◽  
Aluminium Nitride ◽  
Transparent Ceramics ◽  
Plasma Sintering ◽  
Spark Plasma

Properties of Ultrafine-Grained Tungsten Prepared by Ball Milling and Spark Plasma Sintering

2016 ◽  
Vol 821 ◽  
pp. 399-404 ◽  
Author(s):  
Monika Vilémová ◽  
Barbara Nevrlá ◽  
Zdenek Pala ◽  
Lenka Kocmanová ◽  
Marek Janata ◽  
...  
Keyword(s):  
Ball Milling ◽  
Spark Plasma Sintering ◽  
Ball Mill ◽  
Planetary Ball Mill ◽  
Coarse Grained ◽  
First Wall ◽  
Fine Grained ◽  
Plasma Sintering ◽  
Ultrafine Grained ◽  
Spark Plasma

Tungsten is currently considered as the most suitable plasma facing material for the first wall of a nuclear fusion reactor. First wall will be subjected to harsh conditions that will gradually deteriorate properties of the wall material. Some studies point out that fine-grained tungsten could be more resistant to the structure and property changes than coarse-grained tungsten. However, tailoring of tungsten microstructure is very laborious. Due to its high melting point, tungsten is very often processed mechanically and subsequently sintered into a compact body. In this study, preparation of ultrafine-grained tungsten by mechanical processing in a planetary ball mill was examined. Three types of tungsten samples were compared. One was made from coarse grained tungsten powder consolidated by SPS (spark plasma sintering). Other two samples were prepared from the powder processed in a planetary ball mill with and without addition of Y2O3. After ball milling, the powders were consolidated by SPS, i.e. fast sintering process that allows preserving fine-grained structure of the powder material. Properties of the samples such as hardness and thermal conductivity were examined and correlated with the processing history and microstructure.

Indentation strength of silicon nitride ceramics processed by spark plasma sintering technique

2015 ◽  
Vol 644 ◽  
pp. 159-170 ◽  
Author(s):  
N. Azeggagh ◽  
L. Joly-Pottuz ◽  
J. Chevalier ◽  
M. Omori ◽  
T. Hashida ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Nitride Ceramics ◽  
Spark Plasma

Spark Plasma Sintering of fine alpha-silicon nitride ceramics with LAS for spatial applications

2011 ◽  
Vol 31 (4) ◽  
pp. 645-652 ◽  
Author(s):  
Helen Reveron ◽  
Laurent Blanchard ◽  
Yann Vitupier ◽  
Emmanuelle Rivière ◽  
Guillaume Bonnefont ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Nitride Ceramics ◽  
Spark Plasma

scholarly journals Spark Plasma Sintering of Aluminum Nanocomposite Powders: Recent Strategy to Translate from Lab-Scale to Mass Production

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3372
Author(s):  
Roberto Hernández-Maya ◽  
Nicolás Antonio Ulloa-Castillo ◽  
Oscar Martínez-Romero ◽  
Emmanuel Segura-Cárdenas ◽  
Alex Elías-Zúñiga
Keyword(s):  
Electrical Conductivity ◽  
Spark Plasma Sintering ◽  
Mass Production ◽  
Ball Mill ◽  
Scale Up ◽  
Production Equipment ◽  
Multiwalled Carbon ◽  
Aluminum Powders ◽  
Plasma Sintering ◽  
Spark Plasma

The aim of this paper focuses on presenting a recent study that describes the fundamental steps needed to effectively scale-up from lab to mass production parts produced from Al powders reinforced with 0.5 wt% of industrial multiwalled carbon nanotubes (MWCNTs), with mechanical and electrical conductivity properties higher that those measured at the lab scale. The produced material samples were produced via a Spark Plasma Sintering (SPS) process using nanocomposite aluminum powders elaborated with a planetary ball-mill at the lab scale, and high-volume attrition milling equipment in combination with controlled atmosphere sinter hardening furnace equipment, which were used to consolidate the material at the industrial level. Surprisingly, the electrical conductivity and mechanical properties of the samples produced with the reinforced nanocomposite Al powders were made with mass production equipment and were similar or higher than those samples fabricated using metallic powders prepared with ball-mill lab equipment. Experimental measurements show that the hardness and the electrical conductivity properties of the samples fabricated with the mass production Al powders are 48% and 7.5% higher than those of the produced lab samples. This paper elucidates the steps that one needs to follow during the mass production process of reinforced aluminum powders to improve the physical properties of metallic samples consolidated via the SPS process.

Dielectric Properties of Boron Nitride-Aluminium Nitride Composites Prepared by Spark Plasma Sintering

2007 ◽  
Vol 336-338 ◽  
pp. 796-798 ◽  
Author(s):  
Bin Chen ◽  
Wei Pan
Keyword(s):  
Dielectric Constant ◽  
Boron Nitride ◽  
Spark Plasma Sintering ◽  
Room Temperature ◽  
Hexagonal Boron Nitride ◽  
Aluminium Nitride ◽  
Dielectric Constants ◽  
Plasma Sintering ◽  
Dielectric Constant And Loss ◽  
Spark Plasma

In this study, hexagonal Boron Nitride-Aluminium Nitride composites were prepared by spark plasma sintering at 1700°Cfor 4 min under the pressure of 25 MPa, varying the amount of BN from 0 to 30 wt.%. The dielectric constants and losses of the samples were measured from 100 Hz to 1 MHz at room temperature, and the results show that with the increment of BN content, the dielectric constants and losses of AlN-BN composites decrease. When the BN content is 20 wt.%, the dielectric constant and loss of the composites at 1 MHz are 6.18, 2.1 × 10-3 respectively.

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