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Powder modification in the manufacture of solid state capacitor anodes

A capacitor and powder technology, applied in the field of solid capacitors, can solve problems such as sintering problems, lack of uniformity in strength, and low-pressure billet strength

Inactive Publication Date: 2013-06-12
AVX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in a lack of uniformity of strength in the sintered block
Also the method is not suitable for processing niobium oxide powders, which have very low green strength, so sintering is problematic

Method used

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  • Powder modification in the manufacture of solid state capacitor anodes
  • Powder modification in the manufacture of solid state capacitor anodes
  • Powder modification in the manufacture of solid state capacitor anodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] Raw powder

[0042] When the powder particle structure needs to be modified, any source of original valve action niobium oxide can be used. In the present invention, conventionally ground niobium oxide obtained from a supplier employing a thermite NbO production process was used as this source. The appearance, properties and particle size distribution characteristics of the powder are as follows: figure 1 , 3 And shown in the first data column of Table 1. The average particle size of the niobium oxide powder is very fine, about 1.5 μm. The particle size cutoff above the 90th percentile is about 3.3 μm, and the cutoff below the 10th percentile is about 0.57 μm. The powder is too fine for processing to form capacitors by conventional powder metallurgy processes.

[0043] block formation

[0044] The unstructured niobium monoxide raw powder is compacted using a conventionally configured molding / punching press. The raw powder was mixed with 2 wt% of a binder. The ta...

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Abstract

The present invention concerns the field of solid state capacitors and in particular high performance capacitors for use in modern electronic devices. Specifically, the present invention relates to a method by which powders of valve-action material may be modified to make them suitable for use in the formation of capacitor anodes for solid state electrolytic capacitors. According to the present invention there is provided a method of modifying raw valve-action material powder into capacitor grade structured powder comprising: (i) providing a raw powder to be converted; (ii) compressing a portion of the powder to form a porous solid mass of powder (iii) heating the solid mass to a pre-determined sintering temperature and maintaining the temperature for a pre-determined time period to form a sintered body, (iv) pulverising the sintered body to form a processed powder and (v) optionally grading the powder particles within pre-determined size ranges so as to collect capacitor grade powder.

Description

technical field [0001] The invention relates to the field of solid capacitors, in particular to high-performance capacitors used in modern electronic equipment. In particular, the present invention relates to a method by which powders of valve action materials can be modified to make them suitable for use in forming capacitor anodes for solid electrolytic capacitors. The present invention primarily provides a method by which a raw (unstructured) powder can be converted into a structured powder, and also provides the powder obtained or obtainable by this method. Background technique [0002] Solid state capacitors are currently manufactured using a powder metallurgy process in which a high surface area porous anode body is formed by sintering valve action metal or ceramic powder. Typical valve action materials are tantalum or niobium metals or niobium suboxides (such as niobium monoxide, which is a conductive ceramic with valve action properties). While the materials descri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/052C22C1/04B22F1/00C01G33/00C04B35/495
CPCC04B2235/721C04B2235/77C04B2235/5463B22F2998/10C04B2235/9615C04B2235/604C04B2235/5427C01G33/00C04B35/6262C04B2235/5436H01G9/0525C04B2235/3253B22F3/1017B22F3/02B22F9/04B22F1/00C04B35/495C22C1/04
Inventor 布雷迪·A·琼斯科林·麦克拉肯詹姆斯·菲费伊恩·马杰里森托马什·卡尔尼克
Owner AVX CORP
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