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Methods of forming tantalum powders and other valve metal powders are described. The method involves high impact milling a starting powder in a fluid medium and optionally a milling media using a high energy mill. The methods of the present invention have the ability to reduce DC leakage and/or increase capacitance capabilities of valve metal powders when formed into capacitor anodes.
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Finally, EPA notes that import or export non-agglomerated tantalum powder that exhibits a hazardous characteristic would be considered a RCRA hazardous waste and therefore must comply with the ...
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The FTP200 flake tantalum powder was introduced. The microstructures of the powder with leaf-like primary particles having an average flakiness of 2 to 20 and porous agglomerated particles were ...
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Sized and agglomerated powders which are deoxidized are also provided wherein the product of the Volume Mean Diameter, MV, times the specific surface area, BET, is in the range from about 90 to about 250. A process for sizing (i.e., comminuting) a tantalum powder including agglomerates of smaller particles, which process yields a tantalum ...
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Tantalum powder, 99.99% trace metals basis; CAS Number: ; Synonyms: Ta; find Sigma-Aldrich-545007 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich
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JP-2008516432-A chemical patent summary.
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the relative strength of agglomerated particles for some tantalum powder was compared and analyzed. 。 the trend of high cv and miniaturization of solid tantalum electrolytic capacitors and the progress of high cv tantalum powder were briefly described.
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The metallic tantalum powder was successfully synthesized via reduction of tantalum pentoxide (Ta2O5) with magnesium gas at 1073~1223 K for 10 h inside the chamber held under an argon atmosphere. The powder obtained after reduction shows the Ta–MgO mixed structure and that the MgO component was dissolved and removed fully via stirring in a water-based HCl solution.
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powder tantalum agglomerated compacts sintered Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number Inventor James A Pierret
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been "agglomerated" in such a way that the agglomerated powders physically resemble other types of scrap metal (i.e., bits and pieces of metal parts). Cited as an example is tantalum powder that has been mixed with a binder and then sintered at a high temperature under a vacuum to cause the powder
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The FTP200 flake tantalum powder was introduced. The microstructures of the powder with leaf-like primary particles having an average flakiness of 2 to 20 and porous agglomerated particles were ...
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An improved flaked tantalum powder and process for making the flaked powder are disclosed. The powder is characterized by having a Scott density greater than about 18 g/in 3 and preferably at least about 90% of the flake particles having no dimension greater than about 55 micrometers. Agglomerates of the flaked tantalum powder, provide improved flowability, green strength and presssing ...
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An ingot-derived unagglomerated (or preagglomerated) tantalum powder composition includes a platelet tantalum powder having an average FSSS of less than two micrometers, preferably in the range of 0.6 to 1.1 micrometers, a Scott density not greater than about 30 g/in 3, and a BET surface area of at least 0.7 m 2 /g. In one embodiment of the invention, such powder is agglomerated and milled to ...
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metals Article Extraction of Tantalum Powder via the Magnesium Reduction of Tantalum Pentoxide Seon-Min Hwang 1, Jei-Pil Wang 2,* and Dong-Won Lee 1,* 1 Titanium Department, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 641-010, Korea; [email protected] 2 Department of Metallurgical Engineering, Pukyoung National University, Busan 48513, Korea
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Tantalum is a rare element that is highly prized for its applications in industry and emerging technologies. As a refractory metal, tantalum has a very high density (16.7 g/cm 3 at room temperature), a very high melting point (3017 C), and good mechanical strength at high temperatures.. Tantalum stands out from other refractory metals due to its extreme chemical inertness and electrical ...
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The Role of Tantalum Nanoparticles in Bone Regeneration Involves the BMP2/Smad4/Runx2 Signaling Pathway. Guilan Zhang et al. International journal of nanomedicine, 15, 2419-2435 ()
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The present invention accordingly provides a process for the production of pure agglomerated tantalum powder for capacitors by means of thermal agglomeration of starting tantalum powders, which process is characterised in that thermal agglomeration is performed in the presence of hydrogen at temperatures of 600 to 1000° C., preferably of below ...
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The granulated powder obtained as described above was vacuum dried for 11 hours at 70° C., yielding a dry powder. Agglomerated particles of tantalum were then obtained by sintering this dry powder in a vacuum for 1 hour at 950° C.
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Fig. 5 shows the agglomerated flake tantalum powder. While adopting unique spherical agglomeration heat treat- ment and deoxidization methods, the FTP flake tantalum powder has good flowability, high grain strength, and high crush stlength in green pellets, and the anode made with the powder has good penetration for the cathode materials. Fig. 2.
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tantalum powder powder flaked tantalum composition Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US06/683,243 Inventor Marlyn F. Getz
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Tantalum powder(Ta) is used in electronics, metallurgy, steel, chemical, cemented carbide, atomic energy, superconducting technology, automotive electronics, aerospace, medical and health, scientific research and other high-tech fields have important applications. Hunan Huawei provides high-quality Tantalum Powder at competitive prices.
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Freshly prepared tantalum oxide particles were amorphous as indicated by XRD and DTA measurements. The particles crystallize around 750°C giving the hexagonal δ-Ta 2 O 5 form which transforms into the β-Ta 2 O 5 form at 950°C (6). The powders were composed of spherical and non-agglomerated particles with a smooth surface.
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The agglomerated powder can be pressed into a pellet of a desired shape comprising the tantalum fibers of the tightly controlled diameter used to make the primary powder, but with a pellet structure provided with larger sized pores provided by the agglomeration of the primary powder.
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from tantalum powder (surface area per gram of powder is. represented by powder CV/g value) and powder sinter. ... Tantalum capacitor anodes are pressed using agglomerated. tantalum powder.
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The tantalum powder is mixed with alloy elements and then filled into molds. The mixture is then compacted at pressures of up to 2,000 bars. The resulting pressed part (also known as a "green compact") is then sintered in special furnaces at temperatures of over 2,000 °C. During this process, the part acquires its density and its ...
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Tantalum powder capable of producing anodes of improved electrical capacitance is prepared by the addition of phosphorus-containing materials in amounts from about 5 to about 400 ppm based on elemental phosphorus. In one embodiment, the flow properties of the powder are also improved.
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Tantalum Powder. Global Advanced Metals (GAM) produces three types of capacitor grade powder: Angular, Nodular and Flake. ... These powders contain both angular and flake shaped particles, which have been agglomerated to a specified surface area and capacitance range.
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The agglomerated tantalum powder described in this patent also has improved flow characteristics as compared to prior powders. U.S. Pat. No. 3,825,802 discloses improvements in various properties of tantalum capacitors, including specific capacity, by the addition to the tantalum of any of several "dopants", including phosphorus. ...
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For example, tantalum powder that has been mixed with a binder and then sintered at high temperature to cause the particles to form a structure of high mechanical strength and density would meet the definition of "fines, drosses and related materials which have been agglomerated" and would therefore be considered "processed scrap metal ...
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Figure 4 shows SEM images of the tantalum powders prepared using tantalum pentoxides of different origins as precursors. The particles of the tantalum powders prepared using all of the precursors under consideration consist of agglomerates of primary particles that are considerably smaller in size than the starting pentoxide particles ().Note that the agglomerates of the powder …
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High CV/g Powder Performance and Processing Tantalum capacitor anodes are pressed using agglomerated tantalum powder. The powder is first mixed with a binder material to provide the right powder flow and lubrication properties during pressing. From sieve analyses a 70kCV/g agglomerated powder mixed together with a binder does not
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