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pulmonary opacification may result from the use of tantalum powder in the lower airways. INDEX TERMS: Bronchography, contrast media • Tantalum Radiology 104:523535,September 1972 Diagnostic Radiology FOR THE radiologist, tantalum bronchography is' an exercise in controlled particle deposition; for the patient, it becomes a problem of particle clearance.
In this investigation, the sintered tantalum exhibits a relatively high oxygen content (~ wt.%), which would originate from the starting powder, which contained around wt.% of oxygen. As a result, the sintered tantalum materials showed a brittle fracture mechanism during bending tests.
Tantalum mill products such as plate, sheet, foil, tube, rod, and wire are extensively used in the chemical, pharmaceutical, electronic, semiconductor, medical, aerospace, and tooling industries. Tantalum mill products are, for the most part, produced by a combination of ingot metallurgy and thermomechanical processing regardless of the product's final form.
Tantalum electrolytic capacitors exploit the tendency of tantalum to form a protective oxide surface layer, using tantalum powder, pressed into a pellet shape, as one "plate" of the capacitor, the oxide as the dielectric, and an electrolytic solution or conductive solid as the other "plate".
Show this safety data sheet to the doctor in out of dangerous area. If inhaled ... Tantalum powder TWA mg/m3 USA. Occupational Exposure Limits (OSHA) Table Z1 Limits for Air ... Results of PBT and vPvB assessment
Ductile Tantalum and Columbium (New York Meeting. February, 1938) ... upon the nature of the powder, and this results in a bridging action, so that the layers of powder adjacent to the moving punch are pressed more heavily than those further removed in the mass. Frequently, as the
May 23, 2016· An accidental tantalum powder deflagration with casualties occurred during the operation of a bag filter dustcollecting device. To understand the mechanism of the incident and its material hazards, experiments for determining the combustibility and ignition characteristics of the tantalum powder were performed.
Tantalum metal powder, including the precursor to capacitorgrade powder, is generally produced by the sodium reduction of the potassium tantalum fluoride in a molten salt system at high temperature.
data and the powder XRD results, it is now possible to explain the differences in the powder pattern reported in the Powder Diffraction File. The original unit cell reported by Waburg and MullerBuschbaum has thea and FIG. 1. CL spectrum of TZO powder sample at a .
vis different joint assemble (Tantalum–Tantalum). As a result, it is concluded that the 2second joining time gives the highest value of the bonding toughness. Therefore, it represents the optimum joining time. Assemblies Joined By Spot Soldering. Figure 4 illustrates load–displacement curves for .
The result is the loss of several advantages of tantalum electrolytic capacitors: their compact size, thinness, and high capacity. Nichicon sought to solve this problem with the development of a new type of structure for tantalum electrolytic capacitors with safety mechanisms.
With tantalum capacitors are small and micro, the corresponding need to adopt more surface area tantalum powder, mainly used in the liquid reduction, mainly supplemented by mixing sodium, doping technology, the volume rate of tantalum powder increased to 1000uF V yield every year.
ducing tantalum powder is the reduction of potassium fluoro tantalate, K2TaF 7, by sodium. The tantalate is obtained by reacting pure fluoro tantalic acid solution by ... Figure 2 shows the results of the wet test leakage of anodized, sintered tantalum pellets as a fun ction of sodium concentration of the powder.
of tantalum obtained by different means, and also of metallic tantalum powder. This powder, produced in industrial TABLE 4. Quality of Tantalum Obtainable by the Carbothermal Method with Subsequent Vacuum Sintering (Molding Section 10 x 10 mm) Element 'Amt. intro lAmt.
Once tantalum powder is baked in order to solidify it, a crack forms inside the unit. An electric charge can be stored on this crack. Because of the size and weight advantages, tantalum capacitors are useful in portable telephones, pagers, personal computers, and automotive electronics.
tantalum oxide, containing copper fragments and other impurities, was treated in nitric acid to remove the impurities. The powder obtained after rinsing with water was calcinated in the air at 1273 K for 1 h to remove water and carbon. Tantalum in the capacitor scraps was recovered as .
Kinetic and structural aspects of tantalum hydride formation B. R. SIMONOVI]1,*, ... A typical volumeric apparatus consisting of a quartz tube containing a weighed quantity of tantalum powder was thermostated at a given temperature using a tube furnace. The compartment containing the ... RESULTS AND DISCUSSION
Structure, properties, spectra, suppliers and links for: Tantalum, .
ical features of tantalum and niobium, is the internal surface of a volumeporous body, which is made via consolidation of single particles of tantalum powder [1–4]. The application of tantalum as the anode material makes it possible to decrease substantially the sizes of electronic circuits and to enhance its resistance in extreme environments [2].
Dec 29, 2009· Some tantalum products are produced by powder metallurgy technology and this may result in porosity in the weld. The arc cast product does not have porosity. Filler wire is normally not used when welding tantalum and for best results direct current electrode negative is used.
This results in a significant reduction (95%) of the ignition failure mode of niobium oxide capacitors compared to conventional tantalum and niobium metal capacitors. ... Niobium oxide powder is half the density of tantalum powder. This has an effect on total weight of units. Typical
A typical tantalum capacitor is a chip capacitor and consists of tantalum powder pressed and sintered into a pellet as the anode of the capacitor, with the oxide layer of tantalum pentoxide as a dielectric, and a solid manganese dioxide electrolyte as the cathode.
The largest application for tantalum is in the electronics capacitor industry, totaling approximately 68 percent of global demand. Although tantalum consumption in the United States in 2009 was ...
Stable, LowESR Tantalum Capacitors 2000 CARTS by Reed/Marshall Tantalum Development F2117 12/04 Box 5928 ... results in higher efficiency, lower temperature rise, and ... tantalum powder is compacted into a slug and then sintered to achieve a porous body of around 50%
A typical niobium capacitor is a chip capacitor and consists of niobium or niobium oxide powder pressed and sintered into a pellet as the anode of the capacitor, with the oxide layer of tantalum pentoxide as dielectric, and a solid manganese dioxide electrolyte as the cathode.
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