阅读说明：本技术 钽电容器阳极引线用复合丝材及制备方法 (Composite wire material for anode lead of tantalum capacitor and preparation method thereof ) 是由 张九瑛 于 2020-04-28 设计创作，主要内容包括：本发明公开了一种钽电容器阳极引线用复合丝材及制备方法。其中,该钽电容器阳极引线用复合丝材包括：芯体,芯体的材质为除纯钽以外其它金属、钽合金、或其它金属合金；以及钽金属层,包覆在芯体的外表面。应用本发明的技术方案,钽电容器阳极引线用复合丝材具有除纯钽以外的其它金属或合金的芯体和包覆在芯体的外表面的钽金属层,这样既充分利用了表层钽金属可通过阳极氧化在其表面形成高介电常数、高可靠性的氧化膜的特性,又通过使用廉价金属或合金填充其芯部,即满足了钽电容器对阳极引线高介电常数的要求,同时也大幅降低了成本。(The invention discloses a composite wire for an anode lead of a tantalum capacitor and a preparation method thereof. Wherein, this tantalum capacitor anode lead wire includes with compound silk: the core body is made of other metals except pure tantalum, tantalum alloy or other metal alloys; and the tantalum metal layer is coated on the outer surface of the core body. By applying the technical scheme of the invention, the composite wire for the anode lead of the tantalum capacitor has the core body of other metals or alloys except pure tantalum and the tantalum metal layer coated on the outer surface of the core body, so that the characteristics that the surface layer tantalum metal can form an oxide film with high dielectric constant and high reliability on the surface of the core body through anodic oxidation are fully utilized, and the core body is filled with cheap metal or alloy, thereby meeting the requirement of the tantalum capacitor on the high dielectric constant of the anode lead and greatly reducing the cost.)

1. The composite wire material for the anode lead of the tantalum capacitor is characterized by comprising:

the core body is made of other metals except pure tantalum, tantalum alloy or other metal alloys; and

and the tantalum metal layer is coated on the outer surface of the core body.

2. The composite wire for the anode lead of a tantalum capacitor as claimed in claim 1, wherein when the tantalum metal layer is made of tantalum-niobium alloy, the content of tantalum is more than 50% and the sum of the contents of tantalum and niobium is more than 95%; when the tantalum metal layer is made of other alloys except tantalum-niobium alloy, the content of tantalum is more than 95%.

3. The composite wire for a tantalum capacitor anode lead according to claim 1, wherein the cross section of the composite wire for a tantalum capacitor anode lead is circular, elliptical or polygonal.

4. The composite wire for an anode lead of a tantalum capacitor as claimed in claim 1, wherein the ratio of the cross-sectional area of the tantalum metal layer to the cross-sectional area of the composite wire for an anode lead of a tantalum capacitor is in the range of 1% to 80%; preferably 1 to 50%.

5. The composite wire for the anode lead of the tantalum capacitor as claimed in claim 4, wherein the cross section of the composite wire is in an axisymmetric shape, the longest axis is not more than 3.0mm, and the shortest axis is not less than 0.1 mm.

6. The composite wire for a tantalum capacitor anode lead according to claim 1, wherein the material of the core is one or more selected from the group consisting of niobium, zirconium, tungsten, molybdenum, titanium, nickel, iron, copper, aluminum, magnesium, cobalt and alloys thereof.

7. A tantalum capacitor comprising an anode lead, wherein the anode lead is manufactured from the composite wire material for an anode lead of a tantalum capacitor as claimed in any one of claims 1 to 6.

8. A method for producing a composite wire for an anode lead of a tantalum capacitor as claimed in any one of claims 1 to 6, comprising the steps of:

s1, providing a core body; and

and S2, coating a tantalum metal layer on the outer surface of the core body to obtain the composite wire for the anode lead of the tantalum capacitor.

9. The method for preparing the tantalum capacitor anode lead wire according to claim 8, wherein the step of processing the composite wire material for the tantalum capacitor anode lead wire to a required size by one or more of extrusion, rolling, swaging and drawing is further included after the step of S2.

10. The method of claim 8, wherein the coating of the tantalum metal layer on the outer surface of the core body in S2 is performed by powder metallurgy, welding coating, explosion cladding, pipe cladding, fusion casting cladding or vapor deposition.

Technical Field

The invention relates to the technical field of capacitors, in particular to a composite wire for an anode lead of a tantalum capacitor and a preparation method thereof.

Background

Tantalum capacitors are widely used in the fields of communications, computers, automobiles, household appliances, and aerospace. The tantalum capacitor manufactured by using tantalum powder as an anode and tantalum wires as an anode lead has the advantages of small volume, large capacitance, convenient surface mounting, good reliability, long service life and the like. Therefore, the capacitor can stably work under the harsh conditions which can not be met by many other capacitors (such as ceramic, aluminum film and the like).

However, tantalum is a rare metal, resources are scarce, extraction and smelting are difficult, and cost is high, and pure tantalum or high-tantalum alloy is used as an anode lead, so that although an oxide film with a high dielectric constant and high reliability formed by anodic oxidation on the surface of the tantalum is ensured, the high cost of tantalum greatly limits the application field and range of the tantalum.

Therefore, it is highly desirable to develop an anode lead having a low cost and a dielectric constant satisfying the requirements of tantalum capacitors.

Disclosure of Invention

The invention aims to provide a composite wire for an anode lead of a tantalum capacitor and a preparation method thereof, and provides an anode lead which is low in cost and can meet the requirement of the tantalum capacitor on dielectric constant.

In order to achieve the above object, according to one aspect of the present invention, there is provided a composite wire for an anode lead of a tantalum capacitor. The composite wire for the anode lead of the tantalum capacitor comprises: the core body is made of other metals except pure tantalum, tantalum alloy or other metal alloys; and the tantalum metal layer is coated on the outer surface of the core body.

Further, when the tantalum metal layer is made of tantalum-niobium alloy, the content of tantalum is more than 50%, and the sum of the contents of tantalum and niobium is more than 95%; when the material of the tantalum metal layer is other alloys except the tantalum-niobium alloy, the content of tantalum is more than 95 percent.

Further, the cross section of the composite wire material for the anode lead of the tantalum capacitor is circular, oval or polygonal.

Further, the proportion of the cross-sectional area of the tantalum metal layer in the cross-sectional area of the composite wire for the anode lead of the tantalum capacitor is 1-80%; preferably 1 to 50%.

Furthermore, the cross section of the composite wire is in an axial symmetry shape, the longest axis is less than or equal to 3.0mm, and the shortest axis is greater than or equal to 0.1 mm.

Further, the material of the core is selected from one or more of the group consisting of niobium, zirconium, tungsten, molybdenum, titanium, nickel, iron, copper, aluminum, magnesium, cobalt, and alloys thereof.

According to one aspect of the invention, a preparation method of the composite wire for the anode lead of the tantalum capacitor is provided. The preparation method comprises the following steps: s1, providing a core body; and S2, coating the outer surface of the core body with a tantalum metal layer to obtain the composite wire for the anode lead of the tantalum capacitor.

Further, after S2, the method further includes processing the composite wire for the anode lead of the tantalum capacitor to a required size by one or more of extrusion, rolling, swaging and drawing.

Further, in S2, coating the tantalum metal layer on the outer surface of the core body is achieved by powder metallurgy, welding coating, explosion cladding, pipe cladding or fusion casting cladding, and vapor deposition.

By applying the technical scheme of the invention, the composite wire for the anode lead of the tantalum capacitor has the core body of other metals, tantalum alloys or other alloys except pure tantalum and the tantalum metal layer coated on the outer surface of the core body, so that the characteristic that the surface layer tantalum metal can form an oxide film with high dielectric constant and high reliability on the surface of the core body through anodic oxidation is fully utilized, and the core body is filled with cheap metal or alloy, so that the requirement of the tantalum capacitor on the high dielectric constant of the anode lead is met, and the cost is greatly reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic cross-sectional view showing the structure of a composite wire for an anode lead of a tantalum capacitor produced according to an embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Tantalum wire or high tantalum alloy wire is used as a wire material for an anode lead of a tantalum capacitor, and mainly because tantalum can form a very thin oxide film with high dielectric constant and high reliability on the surface thereof through anodic oxidation. However, the tantalum wire or high-tantalum alloy wire manufactured by the prior art is expensive and cannot be widely used, or the performance of the tantalum wire or high-tantalum alloy wire cannot meet all quality requirements of a tantalum capacitor. In order to solve the technical problems, the invention provides the following technical scheme.

According to an exemplary embodiment of the present invention, a composite wire for an anode lead of a tantalum capacitor is provided. The composite wire for the anode lead of the tantalum capacitor is shown in figure 1 and comprises a core body 10 and a tantalum metal layer 20 coated on the outer surface of the core body, wherein the core body is made of other metals except pure tantalum, tantalum alloy or other metal alloys.

By applying the technical scheme of the invention, the composite wire for the anode lead of the tantalum capacitor has the core body made of other metal tantalum alloys except pure tantalum or other metal alloys and the tantalum metal layer coated on the outer surface of the core body, so that the characteristic that the surface layer tantalum metal can form an oxide film with high dielectric constant and high reliability on the surface of the core body through anodic oxidation is fully utilized, and the core part is filled with cheap metal or alloy, so that the requirement of the tantalum capacitor on the high dielectric constant of the anode lead is met, and the cost is greatly reduced.

When the tantalum metal layer is made of tantalum-niobium alloy, the content of tantalum is more than 50%, and the sum of the contents of tantalum and niobium is more than 95%; when the material of the tantalum metal layer is other alloys except the tantalum-niobium alloy, the content of tantalum is more than 95 percent. Typically, the tantalum content in the tantalum metal layer is more than 95 percent, so as to ensure that the surface layer of the composite wire for the anode lead of the tantalum capacitor can form an oxide film with high dielectric constant on the surface thereof through anodic oxidation; the core is made of tantalum alloy with a tantalum content of less than 90%, which is sufficient for cost reduction, but the tantalum content of the tantalum alloy is preferably less than 80%, 70%, 60%, more preferably less than 50%, 40%, 30%, 20%, 10%, etc. In an exemplary embodiment of the invention, the material of the core is selected from one or more of the group consisting of niobium, zirconium, tungsten, molybdenum, titanium, nickel, iron, copper, aluminum, magnesium, cobalt, and alloys thereof. The cross section of the composite wire for the anode lead of the tantalum capacitor can be set to be any shape according to actual needs, such as a circle, an ellipse, a polygon and the like, wherein the polygon is a square, a rectangle, a rhombus, a pentagon, a hexagon and the like.

In order to fully exert the performance of tantalum and ensure excellent performance indexes without overhigh cost, the coating area ratio of the tantalum metal layer is preferably 1-80 percent, more preferably 1-50 percent, namely the cross section area of the surface tantalum metal layer accounts for 1-80 percent, more preferably 1-50 percent of the cross section area of the composite wire material for the anode lead of the tantalum capacitor.

According to a typical embodiment of the invention, the cross section of the composite wire is in an axisymmetric shape, the longest axis is less than or equal to 3.0mm, and the shortest axis is greater than or equal to 0.1 mm.

In accordance with an exemplary embodiment of the present invention, a tantalum capacitor is provided. The tantalum capacitor comprises an anode lead, and the anode lead is made of the composite wire material for the anode lead of the tantalum capacitor. By adopting the composite wire material for the anode lead of the tantalum capacitor, the tantalum capacitor has excellent performance and greatly reduced cost.

According to an exemplary embodiment of the present invention, there is provided a method of preparing the above composite wire for an anode lead of a tantalum capacitor. The preparation method comprises the following steps: s1, providing a core body; and S2, coating the outer surface of the core body with a tantalum metal layer to obtain the composite wire for the anode lead of the tantalum capacitor.

In an exemplary embodiment of the invention, after S2, rolling, extruding, swaging, drawing the composite wire for the anode lead of the tantalum capacitor to the required size is further included according to actual needs. In S2, the coating of the tantalum metal layer on the outer surface of the core body may be achieved by, but not limited to, powder metallurgy, welding coating, explosion cladding, pipe-filling cladding, or fusion-casting cladding.

The following examples are provided to further illustrate the advantageous effects of the present invention.