Dilatometric analysis on the sintering behavior of nanocrystalline W–Cu prepared by mechanical alloying

Ryu, Sung‐Soo; Kim, Y.D; Moon, In‐Hyung

doi:10.1016/s0925-8388(01)01805-9

Cited by 137 publications

(68 citation statements)

References 15 publications

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“…In the last few years, a chemical-activated sintering process has been conducted to improve the sinterability by adding a certain amount of the metal activator into Mo-Cu powders. Nevertheless, these activators (such as Co, Ni, or Fe) exhibit a passive effect on the electrical and thermal properties of the M-Cu composites (M�W, Mo) [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Sintering Behavior and Properties of Mo‐Cu Composites

Sun

Liu

Wang

et al. 2018

Advances in Materials Science and Engineering

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A simple microwave-assisted aqueous solution strategy combined with a subsequent low-temperature hydrogen reduction process was used to prepare Mo-Cu nanopowders. In order to systematically investigate the densification behavior and properties of Mo-Cu composites, the densification, microstructure, hardness, electrical conductivity, thermal conductivity, and bending strength of Mo-Cu compacts were tested after sintering at different temperatures. Results show that the sintering temperature is a critical factor in the densification process of Mo-Cu composites. e shrinkage rate, density, and hardness of sintered composites increase as the temperature rises. However, too high sintering temperature resulted in the decrease in electrical conductivity (EC), thermal conductivity (TC), and bending strength. By optimizing all the performance indicators, high-performance Mo-25 wt.% Cu composites with a homogeneous microstructure accompanied with good physical and mechanical properties could be successfully obtained by sintering for 2 h at 1200°C.

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Section: Introductionmentioning

confidence: 99%

Sintering Behavior and Properties of Mo‐Cu Composites

Sun

Liu

Wang

et al. 2018

Advances in Materials Science and Engineering

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“…In order to properly evaluate the differences between the produced materials, a dilatometer was used to register any dimensional changes and thermal effects; dilatometry is the most suitable method of observation of basic phenomena that are taking place during sintering low-alloy steels [12]. This technique was also successfully used for investigation of samples prepared from mechanically alloyed powders [13,14]. Furthermore, the influence of powder annealing and atmosphere applied during the sintering process was investigated.…”

Section: Introductionmentioning

confidence: 99%

Dilatometric study of low-alloy steels with silicon carbide addition

Hebda

Dębecka

Kazior

2016

J Therm Anal Calorim

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Low-alloy steels produced via the traditional powder metallurgy process, using a die compaction, are currently widely used. Therefore, improving their properties is an issue that attracts much attention. The most common method of enhancing the properties of a given material is introducing additives, e.g., silicon to prealloyed low-alloy steels. It may be added through the mechanical alloying process. The article presents the results of research focused on an analysis of the influence of: (1) the mechanical alloying process, (2) various amounts of silicon carbide: 1, 2 or 3 mass% and carbon addition: 0.4 or 0.6 mass%, (3) different atmospheres, reducing or inert with 10 mass% of hydrogen and (4) the effect of annealing on phenomena occurring during the sintering of low-alloy steel. Moreover, changes in the sinters' microstructure and microhardness were also investigated. Based on the results, it was found that an increase in the amount of silicon in the material causes an increase in the shrinkage of the samples, prepared using mechanical alloying, during the sintering process. This observed effect was independent of the carbon content (0.4 or 0.6 mass%) in the samples as well as of the sintering atmosphere (reducing or inert with 10 mass% of hydrogen). The smallest porosity was observed for samples sintered directly after the mechanical alloying process. There is no need to use a hydrogen atmosphere during sintering-10 % of hydrogen added to an inert, e.g., helium atmosphere is enough to sinter the samples correctly.

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“…This high--energy ball milling method produces high energy impacts on powders by collision between powder particles and grinding media leading to nanocomposite powders with good sinterability [7,8]. To activate sintering and reduce sintering temperature of tungsten from 2800 • C to 1400 • C, the addition of small amounts of the transition metals, such as Ni, Fe, Co or Pd is practiced [5,9,10].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured W-Cu Electrical Contact Materials Processed by Hot Isostatic Pressing

Tsakiris¹,

Lungu²,

Enescu³

et al. 2014

Acta Phys. Pol. A

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Nanostructured W Cu Ni electrical contact materials to be used in low voltage vacuum switching contactors for nominal currents up to 630 A were developed successfully by hot isostatic pressing. W Cu Ni composite powder mixtures with copper content of 20 to 40 wt% and 1 wt% Ni were mechanically alloyed in Ar atmosphere by high--energy ball milling with a ratio of milling steel balls: powders mixtures of 8:1 and rotation speed of 400 rpm for 10 and 20 h. The e ect of mechanical alloying on the sintering response of composite compacts was investigated. Also, the sintered contacts were characterized from the point of view of physical, microstructural, mechanical, and functional properties. The nanostructured electrical contacts presented very good sinterability and homogeneous structures with a maximum compactity degree of about 89%. The best W Cu Ni compositions with relative density of about 80%, chopping currents lower than 5 A, copper content lower than 40% as W 20Cu 1Ni (10 h of mechanical alloying and 20 h of mechanical alloying) and W 30%Cu Ni (10 h of mechanical alloying) were selected to be used in vacuum contactors.

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Dilatometric analysis on the sintering behavior of nanocrystalline W–Cu prepared by mechanical alloying

Cited by 137 publications

References 15 publications

Sintering Behavior and Properties of Mo‐Cu Composites

Sintering Behavior and Properties of Mo‐Cu Composites

Dilatometric study of low-alloy steels with silicon carbide addition

Nanostructured W-Cu Electrical Contact Materials Processed by Hot Isostatic Pressing

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