Generation and characterization of nano-tungsten particles formed by wire explosion process

Sarathi, R.; Sindhu, T. K.; Chakravarthy, Satyanarayanan R.; Sharma, Archana; Nagesh, K. V.

doi:10.1016/j.jallcom.2008.07.092

Cited by 49 publications

(19 citation statements)

References 21 publications

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“…Both coarse micro-powder and surface fine powder prominently reveals that nanoparticle and fine micro-powder are attached on the coarse micro-powder. During the pulse wire explosion process, pulse current passes through the wire feedstock and accordingly, wire is heated by Joule heating [14]. Rapid heating results in inhomogeneous phase transformation of wire feedstock of liquid, gas, and plasma [15].…”

Section: Resultsmentioning

confidence: 99%

Double Step Sintering Behavior Of 316L Nanoparticle Dispersed Micro-Sphere Powder

Jeon¹,

Sohn²,

Lee³

et al. 2015

Archives of Metallurgy and Materials

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316L stainless steel is a well-established engineering material and lots of components are fabricated by either ingot metallurgy or powder metallurgy. From the viewpoints of material properties and process versatility, powder metallurgy has been widely applied in industries. Generally, stainless steel powders are prepared by atomization processes and powder characteristics, compaction ability, and sinterability are quite different according to the powder preparation process. In the present study, a nanoparticle dispersed micro-sphere powder is synthesized by pulse wire explosion of 316L stainless steel wire in order to facilitate compaction ability and sintering ability. Nanoparticles which are deposited on the surface of micro-powder are advantageous for a rigid die compaction while spherical micro-powder is not to be compacted. Additionally, double step sintering behavior is observed for the powder in the dilatometry of cylindrical compact body. Earlier shrinkage peak comes from the sintering of nanoparticle and later one results from the micro-powder sintering. Microstructure as well as phase composition of the sintered body is investigated.

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Section: Resultsmentioning

confidence: 99%

Double Step Sintering Behavior Of 316L Nanoparticle Dispersed Micro-Sphere Powder

Jeon¹,

Sohn²,

Lee³

et al. 2015

Archives of Metallurgy and Materials

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“…Sarathi et al (2009) reported that the size of the nucleus is relatively smaller in a helium ambience (due to the high cooling rate), so that the final mean size of the particles is also relatively smaller in comparison to those of argon and nitrogen ambiences. In any case, when the above operating parameters are set to obtain high uniformity of particle sizes, in-situ measurement using an SMPS equipped with a pressure reducer and a rotating disk diluter is an excellent strategy for determining the optimum conditions in a short time.…”

Section: Discussionmentioning

confidence: 99%

“…Most of the particles appear to be aggregated, with primary particle diameters of 10-100 nm, which is typical of metal nanopowders manufactured by the wire electrical explosion process (Phalen 1972;Wang et al 2001;Kotov 2003;Kim et al 2007;Sarathi et al 2007Sarathi et al , 2009). Some of the primary particles collided with others to form aggregates, but each surface can be clearly distinguished.…”

Section: Comparison Of In-situ Measurements and Imagementioning

confidence: 99%

“…In previous research, metallic nanoparticles produced by the WEE process have been characterized by off-line diagnostic analysis of a sample of nanoparticles, using a scanning electron microscope (SEM), a transmission electron microscope (TEM), wide-angle X-ray diffraction (WAXD), normal X-ray diffraction (XRD), or selected-area electron diffraction (SAED) (Wang et al 2001;Kotov 2003;Sarathi et al 2007Sarathi et al , 2009). However, these methods are not applicable for continuous monitoring of nanoparticles during production.…”

Section: Introductionmentioning

confidence: 99%

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In-Situ Characterization of Metal Nanopowders Manufactured by the Wire Electrical Explosion Process

Lee

Jung

Lee³

2010

Aerosol Science and Technology

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In order to understand the size distributions of metal nanopowders inside manufacturing equipment operated at elevated pressures, a scanning mobility particle sizer is used to carry out in-situ measurements of metal nanopowders manufactured by the wire electrical explosion process. A pressure reducer and rotating disk diluter are used for conditioning metal nanopowder samples appropriate for real-time aerosol instruments operated at atmospheric pressure. Based on measurement data collected downstream of the evaporation chamber, the production of metal nanopowders shows good stability and uniformity for a total number concentration of approximately 5 × 10 7 particles/cm 3 , and a unimodal size distribution with a mean diameter of approximately 170 nm. Using an aerosol electrometer and two sets of electrostatic classifiers, positively charged particles slightly outnumber negatively charged particles. The performance of the rotating disk diluter is confirmed by comparing the size distributions of metal nanopowders diluted with five different dilution factors, ranging from 235 to 2500. SEM and TEM image analysis indicates that most metal nanopowders manufactured by this process consist of aggregated particles, and their size distributions obtained from SEM images are similar to those measured by the SMPS. The changes in particle size distribution at each stage of the manufacturing process, including the evaporation chamber, trap buffer, cyclone, and mesh filter, are also monitored using the above in-situ monitoring system. The resulting in-situ measurement data can be used for design modifications of equipment, as well as for investigating the sources of nanopowder release to the workplace environment.

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“…[1][2][3][4][5] However, the method was not very successful in the production of alloys or intermetallics due to the unavailability of brittle wires of corresponding composition. As a result, synthesis of alloy nano particles by EWE has been restricted to commercially available alloys as AlSi 6) Cu-Zn 7) Ni-Ti 8) Cu-Ni.…”

Section: Introductionmentioning

confidence: 99%

Ti-Cr Nanoparticles Prepared by Electrical Wire Explosion

et al. 2009

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We previously proposed a new method to synthesize nano-sized powders of various alloys and intermetallic compounds. The method consisted of electrical wire explosion of electrodeposted metal wires. In this study, the method was applied for Ti-Cr alloy. The overall composition of the Cr-coated Ti wire was about Ti-25 at% Cr. The explosion products consisted of equilibrium phases of -Ti and TiCr 2 phases along with meta-stable Ti-rich phase. The composition of phase estimated from its lattice parameter was Ti-13 at% Cr. The phase decomposed completely to -Ti and TiCr 2 phases during isothermal aging at 600 C for one day.

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Generation and characterization of nano-tungsten particles formed by wire explosion process

Cited by 49 publications

References 21 publications

Double Step Sintering Behavior Of 316L Nanoparticle Dispersed Micro-Sphere Powder

Double Step Sintering Behavior Of 316L Nanoparticle Dispersed Micro-Sphere Powder

In-Situ Characterization of Metal Nanopowders Manufactured by the Wire Electrical Explosion Process

Ti-Cr Nanoparticles Prepared by Electrical Wire Explosion

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