JPH02240230A - High strength copper alloy - Google Patents

Abstract

PURPOSE:To combinedly provide the copper alloy with high electrical conductivity and high mechanical strength by dispersing specified amt. of Mo fibers having specified average diameter and aspect ratio into a copper matrix. CONSTITUTION:By volume, 0.5 to 30% Mo fibers having <=2mum average diameter and >=25 aspect ratio are dispersed into a matrix constituted of copper. Or, Mo alloy fibers contg. one or more kinds of elements having <=0.5wt.% maximum solid soln. degree into copper are dispersed thereto. Since Mo materials hardly enter a solid soln. into copper, the deterioration of the electric conductivity of the copper alloy dispersedly incorporated into the matrix is extremely less and, on the other hand, the strength of the copper alloy can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a copper alloy having high strength and high conductivity.

(Prior Art) In recent years, f! Demand is increasing in various fields such as energy and semiconductors. In particular, in order to obtain materials with high electrical conductivity above a certain level, it is necessary to keep pace with W4, and to meet this demand, development of precipitation-strengthened steel alloys 1 and dispersion-strengthened steel alloys has been progressing. It's here. Recently, progress has been made in the development of steel-niobium alloys such as 1w4-vanadium as materials with such high conductivity and high strength. These alloys are.

Producing a copper-niobium association or copper-vanadium alloy ingot by melting it by a method such as arc melting, and then applying strength processing to the ingot by processing means such as extrusion, slotting, and rolling. Yo? , ultra-fine steel-niobium alloy or steel-vanadium alloy that has a structure in which fine fibers of niobium or vanadium extended in the processing direction are dispersed in the WIQ matrix + yx, which has almost no solid solution of other Ovc elements. 4I or rII provisional form. The matrix of the ultrafine wires or thin plates of this alloy is made of almost pure copper, so their conductivity is extremely high.
- The fibers dispersed in the matrix are niobium or vanadium, which has been treated for strength.

It has high strength. Therefore, ultrafine sheets or thin sheets of these alloys, which are composites of them, have high mechanical strength and high electrical conductivity. However, niobium or vanadium, which is the reinforcing element in these alloys, has extremely high strength even after being processed for strength. The wire or *fi had the disadvantage that it did not show a higher strength by one light minute. To provide a material that has both high electrical conductivity and high Vh mechanical strength by determining the above-mentioned point that a material having high conductivity l&- that is high in terms of light and at the same time cannot be penetrated. The purpose is to

[Composition of Takumei]

(J 埴￥r-4 υ Means 2 and Effects for Determination) The present inventors have concluded that with conventional alloys, it is not possible to obtain a material that has high mechanical properties and high electrical conductivity. In order to decide on the Kanden point, four festivals were held.

First of all, the elements constituting the fibers that are to serve as reinforcing elements of the alloy must have as low a solid solubility as possible in paulownia, which constitutes the matrix. Specifically, if the maximum solid solubility of the element in steel exceeds 0.5% by weight, the conductivity of the copper matrix itself is impaired, and as a result, the conductivity of the resulting alloy decreases. It becomes lower. Moreover, the elements constituting the fibers, which are the main strength elements of the alloy, are present in a relatively compact shape in the copper matrix of melted ingots or solidified billets during production. In order to be made into fine fibers by processing, it must have good workability. As a result of experiments and considerations, we have found that if molybdenum or an alloy containing molybdenum as the main component is used as the fiber material, it will satisfy these conditions and have sufficiently high mechanical strength.
Moreover, it has been found that a copper alloy having high conductivity can be obtained at the same time.

That is, the present invention includes molybdenum fibers having an average diameter of 2 μm or less and an aspect ratio of 25 or more, or one or more elements having a maximum solid solubility in the steel of 0.5 weight or less. It is a high-strength steel alloy characterized by being made by dividing molybdenum associated fibers containing 0.5 to 30 volumes.

The solybdenum used in the present invention has a maximum solid solubility in steel of 0.5% by weight or less at a temperature below the melting point of steel, and has a tW of 11! , even after heat treatment, f! 4
1. There is almost no chance of a large amount of solid solution in the matrix impairing the conductivity of the steel matrix itself. Sarasakeko molybdenum has moderate workability, and can be processed into YtB 4 or thin plates using the most advanced processing methods. In addition, the koshiki-saban and shizaka obtained in this way have high mechanical strength. In order to further increase the strength of ultra-fine wires and thin plates processed with this process, a molybdenum alloy made by adding an alloying element to molybdenum (7IO) can be used as a fiber coating.
As for elements that cause m 710, unless the solid solubility in the steel is less than 0.5 wt. This will impair conductivity. Therefore, tungsten, nioff, tantalum, vanadium, ruthenium,
Examples include rhenium% carbon and boron. If these elements are added in too large a quantity, they will impair the processability of molybdenum, making it difficult to process it into ultrafine wires or thin plates. When processing a copper alloy in which an alloy made by adding these elements to molybdenum is dispersed in the form of particles in a copper matrix, copper alloy V3! In order for the molybdenum alloy particles dispersed in IS to be sufficiently deformed and processed into the shape of fibers or thin plates, there is an upper limit to the a weight of these elements. If the sieving element content exceeds this, the molybdenum alloy particles will be deformed into light particles and will not be formed into fibers or thin plates, and therefore will not contribute sufficiently to vf4 poor metal conversion. The permissible electricity of molybdenum (in contrast, each
Tungsten below tt*, niobium below 5 electric centimeters, 7
Tantalum with a weight of less than 10 kg, vanadium with a weight of 10 kg or less,
Rhenium less than 5 layers soft.

Ruthenium with 6 or less cations, carbon with 0.3 or less cations,
Boron is in the range of 0.1 fold Fi1-tfb or less. When making a molybdenum alloy by adding element 2 molybdenum of 2 am or more, in addition to the values of each added element being below the above upper limit, the accounting values of those added elements are:
It is necessary that the content be equal to or less than the maximum value of the above-mentioned individual upper limit values of each additional element contained. This is because if more elements than these are added to 7-11 butenium, the workability of the molybdenum alloy particles dispersed in the copper matrix deteriorates, and the processability of the molybdenum alloy particles dispersed in the copper matrix deteriorates. This is because an optically developed structure in which the molybdenum alloy is dispersed cannot be obtained, and therefore a copper alloy with high strength cannot be obtained.

There is also a volume range for the addition of molybdenum or molybdenum alloys to steel alloys, which ranges from 0.5 to 30 volumes relative to the entire copper alloy consisting of molybdenum or molybdenum alloys and a copper matrix. If the amount of molybdenum or molybdenum alloy added to the steel alloy is less than 0.5 volume, the molybdenum or molybdenum alloy in the steel alloy will undergo intense processing and become fine wires or thin plates and dispersed in the steel matrix. However, the strengthening effect is insufficient, and therefore a steel alloy with high optical strength cannot be obtained. In addition, when the added volume exceeds 30 volumes, it becomes difficult to process the steel alloy, and the molybdenum or molybdenum alloy particles dispersed inside the steel alloy are processed by light and are made into ultra-fine wires and thin plates. (No, a copper alloy with a high strength of 9 rays cannot be obtained.)

The shape of the molybdenum fibers or molybdenum alloy fibers distributed in the steel matrix of the steel alloy of the present invention must have a diameter of 2 μm or less.

Further, this fiber may be in the form of a thin plate, in which case the thickness of the thin plate is 2 μm or less. This is because when the diameter or thickness exceeds 2 μm, the 1 dispersion becomes too coarse and the steel matrix V
This is because the dispersion strengthening effect that impedes the movement of dislocations in the mass is reduced, and therefore an alloy with high mechanical strength cannot be obtained.

Next, a preferred method for manufacturing the steel alloy of the present invention will be described.

The ingot of the processed material of the steel alloy of the present invention is actually melted by a melting method. In other words! p! Molybdenum or molybdenum and elements added to molybdenum are added and dissolved in the molten metal. Molybdenum is difficult to melt even in steel in a low melting state, so when adding it, the temperature of the molten steel should be 500 degrees below the melting point.
It is preferable to heat the molybdenum to about 118 m or more.Moreover, it is preferable to add molybdenum in the form of a fine powder in advance to make it easier to heat the steel. It may be added to the molten copper, but in order to uniformly dissolve the added element, add one molybdenum in advance. After forming the alloy of the alloying element and molybdenum, add the base metal to the molten copper. Alternatively, consumable electrode type arc melting may be used. Levitation melting is a suitable method for melting this alloy because it can heat the molten metal to a desired high strength without any reaction with the crucible. be.

In addition, the processed material of the steel alloy of the present invention may be produced by a powder sintering method, and when the powder sintering method is used, it is difficult to strengthen the copper alloy 9! When using a molybdenum alloy as the base material, there is a public safety practice in which an alloy powder of molybdenum and an element to be added to molybdenum is prepared in advance and used as a raw material for powder sintering. Then, a mixture of copper powder and molybdenum powder or molybdenum base metal powder.

After crushing and compacting, it is sintered in an inert or reducing atmosphere at a temperature below the melting point of steel to produce billets, which are processed materials of this alloy. At this time, instead of the usual Q powder compaction and sintering processes, billets may be produced by hobbed pressing process or isostatic pressing process.2. When producing the processed material of the present invention by the powder sintering method, it is possible to use fiber-like or hanging-like materials instead of ordinary powder as the material for the molybdenum or molybdenum alloy to be contained. This powder sintering method is used to manufacture birecito, which is a D-loe material of this alloy.

Before mixing the powder, the molybdenum or molybdenum alloy powder, its fibers, or foil pieces are coated on the surface of the powder to improve the closeness with the steel matrix Vx during the sintering process.

In addition, the steel may be injected with powders of molybdenum or molybdenum alloys to improve their dispersion through mutual contact in the copper matrix tube. This one is Denki Menki.

m'4mi v'P, true steaming, ii, sui4 v
It can be carried out by a normal O method such as thermal spraying with 5% PVD.

Next, Yuko, the processed material of the @alloy of this invention manufactured by this aS method or powder sintering method is an ingot or a billet tube, which is processed into a thin strip of molybdenum or molybdenum alloy that is elongated into a copper matrix V-x. Obtain a structure in which fibers or thin plates are uniformly dispersed. This processing can be carried out by conventional methods such as extrusion, forging, drawing, and rolling.

Also, when manufactured by the powder sintering method, it is a compressed powder.

Captive knot. - A hot extrusion process or a hot isostatic extrusion process in which the subsequent processing is carried out in one process can be carried out. At this time, hot extrusion or hot isostatic extrusion is performed after the mixed raw material powder or the mixed and pressed raw material powder is sealed in a container made of copper or steel.

The primary processing of the ingot or fillet can be done hot or for one time, but the subsequent processing should be done as much as possible! !
It is preferable to perform cold working at a temperature close to warm or 18-hour working, especially for processes close to the final processing step.
It is desirable to perform cold working due to the cost.This is because if the working temperature is too high, there will be too much difference in deformation resistance between steel and molybdenum or molybdenum alloy. Only the copper matrix Vx is deformed, and the molybdenum or molybdenum alloy is not deformed (t), and a structure in which elongated molybdenum or molybdenum alloy thin fibers or thin plates are uniformly dispersed in the iq matrix Vx cannot be obtained. .

This is because an alloy with high strength cannot be obtained.

The alloy according to the present invention can be further processed to develop a dispersed structure of thin fibers or thin plates.
In the case of a bar, ζ is a regular hexagonal cross section after processing 1ζ,
If necessary, a large number of bars may be bundled and packed in a steel pipe for further surface reduction processing, or in the case of plates, many or several plates may be piled up and further rolled. .

In addition, in the copper matrix V of the copper alloy in the glue of the present invention,
In addition to molybdenum or molybdenum alloy fibers or thin plates, A'IOs @ S i O1 oxides, carbides such as sic, 'ric, and wc, TIN, Nb
A powder of nitride such as N may be dispersed in an amount of about 0.1 volume chilled or 5 volumes chilled.

Since these substances hardly dissolve in solid solution when exposed to steel, the conductivity of a copper alloy in which these substances are dispersed in a matrix decreases very little, and the strength of the copper alloy can be further increased by this strength. 21 Invention IJ made of Q steel alloy
In addition to alumina, iron is an unavoidable impurity in the steel that is V-based.

Aluminum, silicon, phosphorus, sulfur, oxygen, etc. may be included in some cases, but the total amount of these impurities and the constituent elements of molybdenum and molybdenum alloys used in the present invention is as follows: In order not to cause a significant decrease in conductivity, the steel matrix should be 0.5
Heavy electricity, limited to less than 俤. This is because, beyond this range, the conductivity of the bright matrix itself becomes as low as less than 85% lAC3.

Further details of the copper alloy 2 of the present invention and its method of use are given below! The collar will be explained using examples.

(Example) Example 1 Box x mm ■Molybdenum wire and box 5 mm GD @ @
The ingots were heated until the molybdenum content was 20% by volume and subjected to consummation polarization, and an ingot of 53 mm in size was produced by arc fermentation in a low-pressure argon atmosphere. After peeling the surface of the ingo and to, it is placed in a can made of copper with a thickness of 5 nm and vacuumed, and then the can is welded and sealed.
Extrusion processing was carried out at 00° C. and a throughput of 8:1. After this extrusion process, a heat treatment was performed at 850'C for 30 minutes to remove the steel ring on the surface of the round bar, and a drawing knife roe was performed at a processing temperature of 250°C to obtain a wire rod with a 2 mm diameter. Machine processing in the rear chamber @Kokooi &0.25 mm
An ol material was obtained. The tensile gkg strength of this wire at room temperature is
The average diameter of molybdenum fibers dispersed in a copper matrix with a conductivity of 3 and 1fr is shown in the table.

Jm%J2 A molybdenum wire of 1 mrn and a copper rod of diameter 5 mm were laid together so that the volume ratio of molybdenum was 5 mm to make a consumable electrode, and the same as in Example 1 was strained to make a wire of Vh O, 25 mm. . However, in this example, no heat treatment was performed after extrusion. The tensile strength of this wire at room temperature and the average diameter of the molybdenum fibers dispersed in the wire are shown in the table.

Example 3 11 mm molybdenum-1O heavy t--tungsten alloy rod and 'f45 rn m O @ metal were bundled so that the volume ratio of molybdenum was 20% to form a +6 wear electrode Example 1
In the same manner as above, the diameter was 0.25 mm (D wire material was used. However, 1
In this example, the heat treatment conditions after extrusion were 930
℃ for 1 hour. The tensile strength and electrical conductivity of this wire at room temperature and the average diameter of the molybdenum alloy fibers dispersed in the steel matrix are shown in the table.

Example 4 1 mrn molybdenum-3 weight niobium wire and 45
m rn (The volume ratio of molybdenum to D copper rod is 20-
A wire rod with a diameter of 0.25 mm was made in the same manner as in Example 1, and the wire rod was laid out so that the consumable wire had one pole. However, in this example, 3
The heat treatment conditions after extrusion were 930'C and 1 hour. The tensile strength, electrical conductivity, and average diameter of the molybdenum backing fibers dispersed in the wire are shown to the public.

Example 5 Molybdenum with a diameter of 1 mm; / -2,5 is i1% niobium-0
, 05-4 thin carbon alloy wire, 5 mm copper rod, and 6 pieces were bundled together so that the molybdenum content was 20 mm, and used as a consumable electrode. It was made into a wire rod. However, in Example 1 and Example 2, the heat treatment conditions after extrusion were 930° C. for 1 hour.

The tensile strength and electrical conductivity of this wire are shown in Table 2 and the average tensile strength and electrical conductivity of the molybdenum alloy fibers dispersed in the steel matrix.

Implementation row 6 Copper powder with an average grain size of 25 μm and molybdenum powder with an average grain size of 5 μm at a volume ratio of 20% were mixed and pressed, and then heat treated at 950° C. for 2 hours in a hydrogen stream at −atmosphere. and sintered to produce a billet.

After the bottle was injected into a single copper can as in Example 1, the extruded can was removed, heat treated, drawn, and wire was drawn to obtain a 25 mm fi Jl material. c wire rod ■ meaning @
(The thorns indicate the tensile strength, conductivity 8, and 0 average yX color of molybdenum fibers dispersed in the copper matrix.

Comparative Example 1 I! of copper-niobium (containing 20% by volume) produced by commercially available arc m! fA50rnm ■ Ingo y
To1 swage forging, drawing and wire drawing ￥:
It was made into a 0.25 mm material. This wire room @
The table shows the tensile strength at tc, the electrical conductivity, and the average diameter of the niobium fibers dispersed in the steel matrix Vx.

Comparative Example 2 Arc sf of steel-molybdenum alloy containing molybdenum of 20 volume axes in the same manner as in Example 1! 4 After hot extrusion and heat treatment on the ingot.

9-1 with fl+2 mm was manufactured by cutting. A wire rod with a diameter of 0.25 mm was obtained by a wire drawing process using a zarahane reiseki process. The tension path through this wire Q2 is conductive lc
2 and - the average diameter of the molybdenum fibers dispersed in the Matrix Vx are shown in Table E.

Comparative Ga 3 A steel-molybdenum alloy containing 35% by volume of molybdenum was produced in the same manner as in Example 1 by arc m-solution. When the ingot was processed by hot extrusion and drawing, warping occurred during processing, and the wire could not be made into a wire rod.

Comparative Example 4 Same as Example 1 - Molybdenum-1O weight 1i in strained steel
A copper alloy containing 20 volumes of s=obium alloy was prepared by fermentation. When the ingot F was processed by hot extrusion and drawing, cracks occurred during processing.
It was not possible to make it into wire rod.

Comparative Example 5 Diameter 1mm ■ Iron - 0.45 Weight - Carbon alloy wire and bowl 5mm0
A consumable electrode was prepared by disposing a steel rod so that the volume ratio of the iron alloy was 20 mm, and a 53 mm diameter I/G V was produced by melting in a low-pressure argon atmosphere. After peeling the i-side of the ingot, it is placed in a 5mm thick can and vacuumed.
The can was sealed and extruded at 600° C. with a processing ratio of 8:10. After the extrusion process, heat treatment was performed at 850°C for 30 minutes to remove the steel ring and holes on the surface of the round bar.

The pulling force is 2mrn at 250℃ machining temperature.
It was made into a wire rod. Thereafter, a wire rod with a size of 0.25 mm was obtained by drawing at room temperature. The tensile strength, electrical conductivity and average CD diameter of the iron alloy dispersed in the steel matrix are shown in the graph of the CCLL material.

thorns [Invention O effect] As can be seen from the above examples and comparative examples.

Since the steel alloy of this invention has both extremely high mechanical strength and high electrical conductivity, its industrial value is extremely large.

Claims (1)

[Claims] A molybdenum alloy containing, in a matrix made of steel, molybdenum fibers with an average diameter of 2 μm or less and an aspect ratio of 25 or more, or one or more elements whose maximum solid solubility in steel is 0.5% by weight or less. A high-strength steel alloy comprising fibers dispersed in an amount of 0.5 to 30% by volume.