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Methods of making a niobium metal oxide and oxygen reduced niobium oxides

A technology of niobium oxide and niobium powder, which is applied in the field where niobium suboxide with excellent morphology is required, can solve the problems of difficulty in preparing final products, increased pollution, and multiple wastes.

Inactive Publication Date: 2009-11-18
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the degree of contamination by oxygen-reduced niobium oxides becomes greater due to the high ratio of getter material to niobium oxides
Purifying the niobium suboxide by e.g. screening or acid leaching the niobium suboxide makes the final product more difficult and generates more waste

Method used

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  • Methods of making a niobium metal oxide and oxygen reduced niobium oxides
  • Methods of making a niobium metal oxide and oxygen reduced niobium oxides
  • Methods of making a niobium metal oxide and oxygen reduced niobium oxides

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[0155] The above-described aspects of the present invention include many advantages, including superior capacitor grade materials and fabrication methods, thereby producing capacitor grade metal materials that can be used to form high performance capacitors characterized by high capacitance and low DC leakage. Morphological and other observable or measurable microstructural characteristics of the capacitor grade materials of the present invention that enhance the enhanced performance characteristics of capacitors made therefrom include: controlled primary particle size, high flowability, high purity, high BET surface area, uniform particle size Size distribution, Scott density, extrudability, crush strength, morphology, stability, dopant content, etc. The valve metal oxide particles formed by deagglomerating the agglomerated particles of the present invention have beneficial properties including high BET surface area and uniform porosity with a minimal proportion of closed and ...

Embodiment 1

[0236] According to one embodiment of the invention, there will be a BET surface area of ​​4.1 m 2 / g of niobium powder (200g) and starting niobium oxide (161g), i.e. with a BET surface area of ​​1.3m 2 / g of niobium pentoxide are mixed together to form a powder mixture. The powder mixture was then granulated and sieved to a particle size of about -40 mesh. The pellet powder mixture was placed in a vacuum heat treatment furnace and heated to about 700° C. under vacuum for about 2 hours. Hydrogen was then passed into the furnace to a pressure of about 960 Torr. The temperature in the furnace was then changed to about 850°C and held for about 1 hour. After forming, various properties of the oxygen-reduced niobium oxides were tested and listed in Table 1. Three or more tests were performed on three or more sample batches of niobium powder and starting niobium oxide, wherein the above tests were repeated with heat treatment temperatures of 900, 1,100, and 1,300°C, respectively...

Embodiment 2

[0244] According to one embodiment of the invention, will have a BET surface area of ​​3.9m 2 / g of niobium powder (20g) and starting niobium oxide (16.1g), which has a BET surface area of ​​3.9m 2 / g of niobium pentoxide are mixed together to form a powder mixture. The powder mixture was then attritor milled (co-milled) in water with 3 / 16" Nb media for 2 hours. The powder slurry was vacuum dried at 120°C and passed through the dried powder through a 50 mesh sieve The granule powder mixture is put into a vacuum heat treatment furnace and heated to about 1100° C. for about 2 hours. Then the temperature in the furnace is changed to about 850° C. and hydrogen is passed into the furnace to pressure About 960 torr, held for about 1 hour. After forming, the various properties of the niobium oxide of oxygen reduction were tested and listed in Table 2. In addition, sample batches of niobium hydride and niobium pentoxide were tested as described above in the absence of Mix under attr...

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Abstract

A method of at least partially reducing niobium oxide is described, wherein the method comprises mixing niobium oxide and powder to form a powder mixture, which is then heat-treated to thereby form heat-treated particles, the particles being allowed to oxidize the oxygen atoms from the niobium The substance is transferred to an atmosphere of niobium powder and reacted for a time and at a temperature sufficient to form oxygen-reduced niobium oxide, thereby forming oxygen-reduced niobium oxide. Oxygen-reduced niobium oxides with high porosity and capacitors comprising anodes made from oxygen-reduced niobium oxides are also described.

Description

[0001] Pursuant to 35 U.S.C. §119(e), this application claims prior US Provisional Patent Application No. 60 / 471,649 (filed May 19, 2003), US Provisional Patent Application No. 60 / 471,650 (filed May 2003) January 19), US Provisional Patent Application No.60 / 533,931 (application date January 2, 2004), US Provisional Patent Application No.60 / 534,461 (application date January 6, 2004), US Provisional Patent Application No. .60 / 535,603 (filed January 9, 2004) and US Provisional Patent Application No. 60 / 568,967 (filed May 7, 2004), which are hereby incorporated by reference in their entireties. Background technique [0002] The present invention relates to niobium and other valve metals) and oxides thereof, more particularly to niobium oxides and methods of at least partially reducing niobium oxides, and to oxygen-reduced niobium oxides and other valve metal oxides. The present invention relates to niobium oxides and other valve metal oxides which are useful, for example, in the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G33/00C01G35/00
CPCH01G9/0525
Inventor 戴维·M·里德斯里达·维尼加拉里奇·W·基切尔斯蒂芬·J·克劳斯希瑟·L·恩曼多兰·L·舒尔茨杰弗里·A·柯克纳
Owner CABOT CORP
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