JP6031549B2 - Copper alloy plate for heat dissipation parts - Google Patents

Description

  The present invention relates to a heat sink, heat sink, heat pipe, and other copper alloy plate for heat dissipating parts that process heat generated from a CPU, LED lamp, etc. of a computer. In particular, the present invention relates to a copper alloy plate for a heat dissipation component that is used when a process of heating to a high temperature such as brazing, diffusion bonding, deaeration, or the like is included as part of the manufacturing process of the heat dissipation component.

The speed of operation and the increase in density of CPUs mounted on desk-type PCs, notebook PCs, and the like are rapidly progressing, and the amount of heat generated from these CPUs is further increasing. When the temperature of the CPU rises above a certain level, it causes malfunctions, thermal runaway, etc., so effective heat dissipation from a semiconductor device such as a CPU is a serious problem.
Heat sinks are used as heat dissipating parts that absorb the heat of semiconductor devices and dissipate them into the atmosphere. Since the heat sink is required to have high thermal conductivity, copper, aluminum, or the like having a high thermal conductivity is used as a material. However, the convective heat resistance limits the performance of the heat sink, and it has become difficult to satisfy the heat dissipation requirement of high-functional electronic components that increase the amount of heat generation.

  For this reason, tubular heat pipes and flat heat pipes (vapor chambers) having high thermal conductivity and heat transport capability have been proposed as heat dissipation components having higher heat dissipation properties. The heat pipe exhibits higher heat dissipation characteristics than the heat sink by cyclically performing evaporation (heat absorption from the CPU) and condensation (release of absorbed heat) of the refrigerant sealed inside. It has also been proposed to solve the heat generation problem of semiconductor devices by combining heat pipes with heat radiating components such as heat sinks and fans.

  As a material for a heat radiating component used for a heat radiating plate, a heat sink, a heat pipe or the like, a plate or tube made of pure copper (oxygen-free copper: C1020) having excellent conductivity and corrosion resistance is frequently used. In order to ensure moldability, soft annealed materials (O materials) and 1 / 4H tempered materials are used as raw materials, but deformation and wrinkles are likely to occur during the manufacturing process of heat-dissipating parts, which will be described later. There are problems such as burrs being easily generated and punching dies being easily worn. On the other hand, Patent Documents 1 and 2 describe an Fe-P-based copper alloy plate as a material for a heat dissipation component.

For heatsinks and heat sinks, pure copper plates are processed into a predetermined shape by press molding, punching, cutting, drilling, etching, etc., and then subjected to Ni plating and Sn plating as necessary before solder, brazing, adhesive, etc. To join with a semiconductor device such as a CPU.
A tubular heat pipe (see Patent Document 3) is formed by sintering copper powder in a tube to form a wick, heat-degassing treatment, brazing and sealing one end, and putting a refrigerant in the tube under vacuum or reduced pressure. And the other end is brazed and sealed.

  The planar heat pipe (see Patent Documents 4 and 5) is a further improvement of the heat dissipation performance of the tubular heat pipe. In order to efficiently condense and evaporate the refrigerant, a flat heat pipe has been proposed in which the inner surface is roughened, grooved, and the like, similar to the tubular heat pipe. A method of brazing, etc. after joining two upper and lower pure copper plates that have undergone processing such as press molding, punching, cutting, etching, etc. by brazing, diffusion bonding, welding, etc. Seal with. A degassing process may be performed in a joining process.

Moreover, what was comprised from the outer surface member and the internal member accommodated in the inside of an outer surface member as a planar heat pipe is proposed. One or a plurality of internal members are arranged inside the outer surface member in order to promote condensation, evaporation, and transport of the refrigerant, and various shapes of fins, protrusions, holes, slits, and the like are processed. Also in this type of flat heat pipe, after placing the internal member inside the external surface member, the external surface member and the internal member are joined and integrated by a method such as brazing or diffusion bonding, and after putting the refrigerant, brazing, etc. It seals by the method of.
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JP 2003-277853 A JP 2014-189816 A JP 2008-232563 A JP 2007-315745 A JP 2014-134347 A

In the manufacturing process of these heat radiating components, the heat radiating plate and the heat sink are heated to about 200 to 700 ° C. in the soldering and brazing processes. Tubular heat pipes and planar heat pipes are heated to about 800 to 1000 ° C. in processes such as sintering, degassing, brazing using phosphorous copper brazing (BCuP-2, etc.), diffusion bonding, and welding.
For example, when a pure copper plate is used as the material for the heat pipe, the softening is severe when heated at a temperature of 650 ° C. or higher. For this reason, the heat pipe manufactured is easily deformed when mounted on a heat sink, a semiconductor device, or incorporated in a PC housing, and the structure inside the heat pipe changes, thereby exhibiting the desired heat dissipation performance. There is a problem that makes it impossible. Moreover, in order to avoid such a deformation | transformation, what is necessary is just to thicken the thickness of a pure copper plate, but if it does so, the mass and thickness of a heat pipe will increase. When the thickness increases, there is a problem that the gap inside the PC casing is reduced and the convective heat transfer performance is lowered.

  Also, the copper alloy plates (Fe-P series) described in Patent Documents 1 and 2 are softened when heated at a temperature of 650 ° C. or higher, and the conductivity is greatly reduced as compared with pure copper. For this reason, for example, when a flat heat pipe is manufactured through processes such as sintering, degassing, brazing, diffusion bonding, welding, etc., it is easily deformed by the process of transporting and handling the heat pipe, incorporating it into the substrate, etc. . Moreover, the expected performance as a heat pipe cannot be obtained due to the decrease in conductivity.

  The present invention has been made in view of the above problems when a process of heating to a temperature of 650 ° C. or higher is included in a part of the process of manufacturing a heat dissipation component from pure copper or a copper alloy plate. An object of the present invention is to provide a copper alloy plate capable of giving sufficient heat resistance and heat dissipation performance to a heat dissipation component manufactured through a heating process.

The copper alloy plate for heat radiating component according to the present invention is used when a process of heating to 650 ° C. or more and an aging treatment are included as part of the process of manufacturing the heat radiating component, and one or two of Ni and Co. 1.0-4.0 mass%, Si 0.2-1.2 mass%, the total content (mass%) of Ni and Co is [Ni + Co], and the Si content (mass% ) Is [Si], the content ratio [Ni + Co] / [Si] is 3.5 to 5, the balance is made of Cu and inevitable impurities, 0.2% proof stress is 300 MPa or more, and excellent bending It has processability, has a 0.2% proof stress of 300 MPa or more, and a conductivity of 25% IACS or more after aging at 850 ° C. for 30 minutes, followed by water cooling and then heating at 500 ° C. for 2 hours .

  The copper alloy plate for heat-dissipating parts according to the present invention may further include Sn: 1.0% by mass or less, Mg: 0.2% by mass or less, and Zn: 1.5% by mass or less as an alloy element as necessary. It can contain seeds or two or more. Moreover, the copper alloy plate for heat radiating components according to the present invention may further include one or more of Al, Cr, Ti, Zr, Fe, P, and Ag as alloying elements, if necessary. It can contain below mass%.

The copper alloy plate according to the present invention is used when a process of heating to 650 ° C. or more and an aging treatment are included as part of the process of manufacturing a heat dissipation component. That is, the heat radiating component manufactured using the copper alloy plate according to the present invention is subjected to aging treatment after high-temperature heating to 650 ° C. or higher, and the strength is improved.
When the copper alloy sheet according to the present invention is heated to 850 ° C. for 30 minutes and then subjected to an aging treatment, the 0.2% proof stress is 300 MPa or more and the conductivity is 25% IACS or more. Since the copper alloy plate according to the present invention has high strength after aging treatment, a heat dissipation component such as a heat pipe manufactured using the copper alloy plate is attached to a heat sink, a semiconductor device, or incorporated into a PC housing or the like. In addition, the heat radiating component is not easily deformed. In addition, the copper alloy plate according to the present invention has a conductivity lower than that of a pure copper plate, but since the strength after the aging treatment is high, the copper alloy plate can be thinned and can compensate for a decrease in conductivity in terms of heat dissipation performance.

Hereinafter, the copper alloy plate for heat dissipation component according to the present invention will be described in more detail.
The copper alloy plate according to the present invention is processed into a predetermined shape by press molding, punching, cutting, etching, etc., and heated for high temperature heating (degassing, joining (brazing, diffusion bonding, welding), sintering, etc.) ) To finish heat dissipation parts. Although the heating conditions for the high-temperature heating differ depending on the type of heat-radiating component and the manufacturing method, the present invention assumes a case where the high-temperature heating is performed at about 650 ° C to 1050 ° C. The copper alloy plate according to the present invention is made of a (Ni, Co) -Si based copper alloy having a composition to be described later. When heated within the temperature range, at least the (Ni, Co) -Si compound precipitated in the base material. A part is dissolved, crystal grains grow, and softening and decrease in conductivity occur.

  The copper alloy sheet according to the present invention has a strength (0.2% yield strength) of 300 MPa or more and an electrical conductivity of 25% IACS or more after being heated at 850 ° C. for 30 minutes and then water-cooled and then subjected to an aging treatment. Heating at 850 ° C. for 30 minutes is a heating condition that assumes the above-described high-temperature heating process in the manufacture of a heat dissipation component. When the copper alloy plate according to the present invention is heated at high temperature under these conditions, the (Ni, Co) -Si compound precipitated before heating is solid-dissolved, crystal grains grow, softening, and conductivity decrease occurs. . Next, when the copper alloy sheet is subjected to an aging treatment, a fine (Ni, Co) -Si compound is precipitated. Thereby, the intensity | strength and electrical conductivity which were reduced by the said high temperature heating improve notably.

The aging treatment is (a) held for a certain time in the precipitation temperature range during the cooling step after high-temperature heating, (b) cooled to room temperature after high-temperature heating, and then reheated to the precipitation temperature range and held for a certain time. (C) After the step (a), it can be carried out by a method such as reheating to the precipitation temperature range and holding for a certain period of time.
Specific aging treatment conditions include a condition of holding for 5 minutes to 10 hours in a temperature range of 300 to 600 ° C. When priority is given to improving the strength, the temperature-time condition in which a fine (Ni, Co) -Si compound is generated, and when priority is given to improving the electrical conductivity, Ni, Co, and Si, which are dissolved, decrease over time. The temperature-time condition may be selected as appropriate.

The copper alloy plate after the aging treatment has a lower electrical conductivity than the pure copper plate after high-temperature heating, but the strength is significantly higher than that of the pure copper plate. In order to acquire this effect, heat dissipation parts, such as a heat pipe manufactured using the copper alloy board concerning the present invention, are subjected to aging treatment after high temperature heating. The aging treatment conditions are as described above. The heat-dissipating component (copper alloy plate) after the aging treatment has high strength and can prevent deformation of the heat-dissipating component when it is attached to a heat sink, a semiconductor device, or incorporated in a PC housing or the like. Moreover, since the copper alloy plate (after aging treatment) according to the present invention has higher strength than that of a pure copper plate, it can be thinned (0.1 to 1.0 mm thick). The performance can be enhanced and the decrease in conductivity when compared with a pure copper plate can be compensated.
The copper alloy plate according to the present invention has a 0.2% proof stress of 300 MPa or more after aging treatment even when the temperature of the high-temperature heating is less than 850 ° C. (650 ° C. or more) or more than 850 ° C. (1050 ° C. or less). And conductivity of 25% IACS or higher can be achieved.

  The copper alloy plate according to the present invention is processed into a heat radiation component by press molding, punching, cutting, etching, or the like before being heated to a high temperature of 650 ° C. or higher. It is preferable that the copper alloy plate has a strength that does not easily deform during conveyance and handling during the processing, and has mechanical characteristics that allow the processing to be performed without hindrance. More specifically, the copper alloy plate according to the present invention preferably has a 0.2% proof stress of 300 MPa or more and excellent bending workability (see Examples described later). If the above characteristics are satisfied, the tempering of the copper alloy sheet is not a problem. For example, any of a solution-treated material, an aging-treated material, and a cold-rolled aging-treated material can be used.

  As described above, the heat dissipation component manufactured by processing the copper alloy plate according to the present invention softens when heated to a temperature of 650 ° C. or higher. It is preferable that the heat dissipating component after high-temperature heating has a strength that does not easily deform during conveyance and handling when performing an aging treatment. For that purpose, it is preferable to have a 0.2% yield strength of 50 MPa or more at the stage of heating at 850 ° C. for 30 minutes and then water cooling.

  The heat-radiating component manufactured using the copper alloy plate according to the present invention is subjected to aging treatment, and if necessary, at least a part of the outer surface is coated with Sn for the purpose of improving corrosion resistance and solderability. A layer is formed. The Sn coating layer includes electroplating, electroless plating, or those formed by heating to a melting point of Sn or lower or higher than the melting point of Sn. The Sn coating layer includes Sn metal and an Sn alloy, and the Sn alloy includes one or more of Bi, Ag, Cu, Ni, In, and Zn as alloy elements in addition to Sn in a total amount of 5% by mass or less. Things.

  Under the Sn coating layer, a base plating of Ni, Co, Fe or the like can be formed. These base platings have a function as a barrier for preventing the diffusion of Cu and alloy elements from the base material and a function for preventing damage by increasing the surface hardness of the heat dissipation component. After Cu is plated on the base plating, and further Sn is plated, a heat treatment is performed by heating to a temperature lower than or equal to the melting point of Sn to form a Cu—Sn alloy layer, and the base plating, Cu—Sn alloy layer and Sn are formed. A three-layer structure of the coating layer can also be used. The Cu—Sn alloy layer has a function as a barrier for preventing diffusion of Cu and alloy elements from the base material, and a function for preventing scratches by increasing the surface hardness of the heat dissipation component.

  Moreover, after heat-radiating components manufactured using the copper alloy plate which concerns on this invention receive an aging treatment, Ni coating layer is formed in at least one part of an outer surface as needed. The Ni coating layer has a barrier that prevents the diffusion of Cu and alloy elements from the base material, a damage prevention by increasing the surface hardness of the heat dissipation component, and a function of improving corrosion resistance.

Next, the composition of the copper alloy sheet according to the present invention will be described.
Ni and Si generate Ni ₂ Si precipitates and improve the strength of the copper alloy. However, when the Ni content is less than 1.0 mass% or the Si content is less than 0.2 mass%, the effect is small. On the other hand, when Ni content exceeds 4.0 mass% or Si content exceeds 1.2 mass%, Ni or Si crystallizes or precipitates at the time of casting, and hot workability falls. Therefore, the Ni content is 1.0 to 4.0 mass%, and the Si content is 0.2 to 1.2 mass%. The lower limit of the Ni content is preferably 1.1% by mass, and the upper limit is preferably 3.9% by mass.

When the Ni content (% by mass) is [Ni] and the Si content (% by mass) is [Si], when the content ratio [Ni] / [Si] is less than 3.5 or more than 5, Excessive Ni or Si is dissolved and the electrical conductivity is lowered. Therefore, the content ratio [Ni] / [Si] is set to 3.5 to 5.
Note that part or all of Ni can be replaced with Co. In this case, the total content [Ni + Co] of Ni and Co is in the range of 1.0 to 4.0% by mass, and the content ratio [Ni + Co] / [Si] is 3.5 to 5.

  Sn has a function of improving the strength of the copper alloy by dissolving in the copper alloy matrix, and is added as necessary. Further, the addition of Sn is also effective in improving the stress relaxation resistance. When the usage environment of the heat dissipating component is 80 ° C. or higher, creep deformation occurs and the contact surface with a heat source such as a CPU is reduced, resulting in a decrease in heat dissipation, but by improving the stress relaxation resistance, This phenomenon can be suppressed. In order to obtain the effect of improving strength and stress relaxation resistance, the Sn content is set to 0.005% by mass or more, preferably 0.01% by mass or more, more preferably 0.02% by mass or more. On the other hand, when Sn content exceeds 1.0 mass%, the bending workability of a copper alloy plate will be reduced and the electrical conductivity after an aging treatment will be reduced. Therefore, the Sn content is 1.0% by mass or less, preferably 0.6% by mass or less, more preferably 0.3% by mass or less.

  Similar to Sn, Mg has a function of being dissolved in the copper alloy matrix and improving the strength and stress relaxation resistance of the copper alloy, and therefore is added as necessary. In order to obtain the effect of improving strength and stress relaxation resistance, the Mg content is set to 0.005 mass% or more. On the other hand, if the Mg content exceeds 0.2% by mass, the bending workability of the copper alloy plate is lowered and the electrical conductivity after the aging treatment is lowered. Therefore, the Mg content is 0.2% by mass or less, preferably 0.15% by mass or less, more preferably 0.05% by mass or less.

Zn has the effect of improving the heat-resistant peelability of the solder of the copper alloy plate and the heat-resistant peelability of Sn plating, and therefore is added as necessary. When incorporating a heat dissipation component into a semiconductor device, soldering may be required, and after manufacturing the heat dissipation component, Sn plating may be performed to improve corrosion resistance. A copper alloy plate containing Zn is suitably used for manufacturing such a heat dissipation component. However, if the Zn content exceeds 2.0 mass%, the solder wettability decreases, so the Zn content is set to 2.0 mass% or less. The upper limit of the Zn content is preferably 0.7% by mass or less, and more preferably 0.5% by mass or less. On the other hand, if the Zn content is less than 0.01% by mass, it is insufficient for improving the heat-resistant peelability, and the Zn content is preferably 0.01% by mass or more. The lower limit of the Zn content is more preferably 0.05% by mass and even more preferably 0.1% by mass.
In addition, when the copper alloy plate of the present invention contains Zn, when heated at a temperature of 500 ° C. or more, depending on the heating atmosphere, Zn is vaporized, which may deteriorate the surface properties of the copper alloy plate or contaminate the heating furnace. is there. From the viewpoint of preventing vaporization of Zn, the Zn content is preferably 0.5% by mass or less, more preferably 0.3% by mass or less, and further preferably 0.2% by mass or less.

  Since Al, Mn, Cr, Ti, Zr, Fe, P, and Ag have an effect of improving the strength and heat resistance of the copper alloy, one or more of these are added as necessary. However, when the total content of one or more of these elements exceeds 0.5% by mass, the electrical conductivity decreases. The lower limit of the total content of one or more of these elements is preferably 0.01% by mass, more preferably 0.02%, and even more preferably 0.03%.

  The inevitable impurities H, O, S, Pb, Bi, Sb, Se, As gather at the grain boundary when the copper alloy plate is heated to a temperature of 650 ° C. or higher for a long time, and the grain boundary during and after heating Since there is a possibility of causing cracks and grain boundary embrittlement, the content of these elements is preferably reduced. H is preferably less than 1.5 ppm (mass ppm, the same applies hereinafter), more preferably less than 1 ppm, because it collects at the grain boundaries and the interface between inclusions and the base material during heating and generates swelling. O is preferably less than 20 ppm, more preferably less than 15 ppm. S, Pb, Bi, Sb, Se, As are preferably less than 30 ppm in total, and more preferably less than 20 ppm. In particular, for Bi, Sb, Se and As, the total content of these elements is preferably less than 10 ppm, more preferably less than 5 ppm.

  As a standard manufacturing method, the copper alloy sheet according to the present invention is subjected to soaking treatment of the ingot and hot rolling, followed by cold rolling, recrystallization treatment with solution treatment, cold rolling, and precipitation treatment. Manufactured. A copper alloy sheet manufactured using the copper alloy having the above composition under the following conditions has a 0.2% proof stress of 300 MPa or more and excellent bending workability. Further, after heating at 850 ° C. for 30 minutes and then aging treatment, it has a 0.2% proof stress of 300 MPa or more and a conductivity of 25% IACS or more.

  Melting and casting can be performed by ordinary methods such as continuous casting and semi-continuous casting. In addition, it is preferable to use what has little S, Pb, Bi, Se, As content as a copper melt | dissolution raw material. In addition, it is preferable to reduce O and H by paying attention to the red heat (moisture removal) of charcoal to be coated on the molten copper alloy, bare metal, scrap raw materials, firewood, mold drying, deoxidation of the molten metal, and the like.

The homogenization treatment is preferably held for 30 minutes or more after the temperature inside the ingot reaches 800 ° C. The holding time of the homogenization treatment is more preferably 1 hour or more, and further preferably 2 hours or more.
After the homogenization treatment, hot rolling is started at a temperature of 800 ° C. or higher. In order to prevent coarse (Ni, Co) -Si precipitates from being formed on the hot-rolled material, the hot-rolling is preferably completed at a temperature of 600 ° C. or higher, and then rapidly cooled by a method such as water cooling. When the rapid cooling start temperature after hot rolling is lower than 600 ° C., coarse (Ni, Co) -Si precipitates are formed, the structure tends to be uneven, and the strength of the copper alloy plate (product plate) decreases. .

By applying a certain strain to the copper alloy sheet by cold rolling after hot rolling, a copper alloy sheet having a desired recrystallized structure (fine recrystallized structure) is obtained after the subsequent recrystallization process. The processing rate of this cold rolling is preferably 5 to 35%.
The recrystallization treatment with solution treatment is performed at 650 to 950 ° C., preferably at 670 to 900 ° C. for 3 minutes or less. When the content of Ni, Co, and Si in the copper alloy is small, it is performed in a lower temperature range within the above temperature range, and when the content of Ni, Co, and Si is large, it is performed in a higher temperature region within the above temperature range. It is preferable. By this recrystallization treatment, Ni, Co, and Si can be dissolved in the copper alloy base material, and a recrystallized structure (crystal grain size of 1 to 20 μm) can be formed with good bending workability. If the temperature of this recrystallization process is lower than 600 ° C., the amount of Ni, Co, and Si dissolved will decrease and the strength will decrease. On the other hand, when the temperature of the recrystallization treatment exceeds 950 ° C. or the treatment time exceeds 3 minutes, the recrystallized grains become coarse.

After recrystallization treatment with solution, (a) cold rolling and aging treatment, (b) after cold rolling and aging treatment, and further cold rolling to product thickness, or (c) of (b) above Later, low temperature annealing (recovery of ductility) is performed.
The precipitation treatment is performed under the condition of holding at a heating temperature of about 300 to 600 ° C. for 0.5 to 10 hours. When the heating temperature is less than 300 ° C., the amount of precipitation is small, and when it exceeds 600 ° C., the precipitate tends to be coarsened. The lower limit of the heating temperature is preferably set to 350 ° C., the upper limit is preferably 580 ° C., more preferably from 560 ° C.. The holding time of the precipitation treatment is appropriately selected depending on the heating temperature, and is performed within a range of 0.5 to 10 hours. When the holding time is 0.5 hours or less, the precipitation is insufficient, and even if the holding time exceeds 10 hours, the amount of precipitation is saturated and the productivity is lowered. The lower limit of the holding time is preferably 1 hour, more preferably 2 hours.

Copper alloys having the compositions shown in Table 1 were cast to form ingots each having a thickness of 45 mm. In this copper alloy, H, which is an inevitable impurity, was less than 1 ppm, O was less than 20 ppm, more preferably less than 15 ppm, and S, Pb, Bi, Sb, Se, As were less than 20 ppm in total.
Each ingot was subjected to a soaking treatment at 965 ° C. for 3 hours, followed by hot rolling to obtain a hot-rolled material having a plate thickness of 15 mm, and quenching (water cooling) from a temperature of 600 ° C. or higher. After polishing both sides of the hot-rolled material after quenching by 1 mm each, cold rough rolling to a target plate thickness of 0.43 mm and holding at 650 to 850 ° C. for 10 to 60 seconds (with solution treatment) Went. Next, after precipitation annealing at 450 ° C. for 2 hours, 30% finish cold rolling was performed to produce a copper alloy plate having a thickness of 0.3 mm.

Using the obtained copper alloy plate as a test material, each measurement test of electrical conductivity, mechanical characteristics, bending workability, and solder wettability was performed in the following manner.
The obtained copper alloy sheet was heated at 850 ° C. for 30 minutes and then cooled with water, and further heated at 500 ° C. for 2 hours (precipitation treatment). A test was conducted.
Table 2 shows the test results.

(Measurement of conductivity)
The conductivity was measured by a four-terminal method using a double bridge in accordance with a nonferrous metal material conductivity measurement method defined in JIS-H0505.
(Mechanical properties)
A JIS No. 5 tensile test piece was cut out from the test material so that the longitudinal direction was parallel to the rolling direction, and a tensile test was performed in accordance with JIS-Z2241, thereby measuring the yield strength and elongation. The yield strength is a tensile strength corresponding to a permanent elongation of 0.2%.

(Bending workability)
The measurement of bending workability was carried out according to the W bending test method defined in JBMA-T307 standard for copper elongation. A test piece having a width of 10 mm and a length of 30 mm was cut out from each specimen, and G. W. (Good Way (bending axis is perpendicular to rolling direction)) and B.I. W. (Bad Way (bending axis is parallel to the rolling direction)) was performed. Next, the presence or absence of cracks in the bent portion was visually observed with a 100 × optical microscope. W. Or B. W. No cracks on both sides (circle) (pass), G. W. Or B. W. Those in which cracking occurred in either one or both were evaluated as x (failed).

(Solder wettability)
A strip-shaped test piece was collected from each test material, and the inactive flux was dip coated for 1 second, and then the solder wetting time was measured by the menisograph method. The solder was Sn-3 mass% Ag-0.5 mass% Cu maintained at 260 ± 5 ° C., and the test was performed under the test conditions of an immersion speed of 25 mm / sec, an immersion depth of 5 mm, and an immersion time of 5 sec. A solder wetting time of 2 seconds or less was evaluated as having excellent solder wettability. Except for Comparative Example 7, the solder wetting time was 2 seconds or less.

  The copper alloy plates of Examples 1 to 18 shown in Table 2 have an alloy composition that satisfies the provisions of the present invention, and are heated at 850 ° C. for 30 minutes and then subjected to aging treatment (0.2% proof stress) of 300 MPa or more. And the conductivity is 25% IACS or more. The copper alloy sheet before heating at 850 ° C. has a strength (0.2% proof stress) of 300 MPa or more, and is excellent in bending workability and solder wettability. Even after heating at 850 ° C., it has a strength of 50 MPa or more (0.2% yield strength).

On the other hand, the copper alloy plates of Comparative Examples 1 to 7 are inferior in some characteristics as shown below.
Since the comparative example 1 has little Fe content, the intensity | strength after an aging treatment is low.
In Comparative Example 2, since the Fe content was excessive, cracking occurred during hot rolling, and it was not possible to proceed to the process after hot rolling.
In Comparative Example 3, the content ratio [Ni] / [Si] of Ni and Si was too high, and excessive Ni was dissolved, resulting in a decrease in conductivity after aging treatment.
In Comparative Example 4, the content ratio [Ni] / [Si] of Ni and Si was too low, and excessive Si was dissolved, and the conductivity after the aging treatment was lowered.
In Comparative Examples 5 and 6, the Sn or Mg content was excessive, the bending workability of the copper alloy plate was inferior, and the electrical conductivity after the aging treatment was lowered.
In Comparative Example 7, the Zn content was excessive and the solder wettability was poor as described above.

  Of the copper alloy plates shown in Table 1, typical ones (Examples 2 and 6 and Comparative Examples 1 and 7) were heated at 1000 ° C. for 30 minutes, then water-cooled, and further heated at 500 ° C. for 2 hours (aging treatment). Using the copper alloy plate as a test material, each measurement test for electrical conductivity and mechanical properties was performed by the method described in Example 1. The results are shown in Table 3.

As shown in Table 3, in Examples 2 and 6, the strength (0.2% yield strength) after heating at 1000 ° C. for 30 minutes and then aging treatment was 300 MPa or more, and the conductivity was 25% IACS or more. is there.
On the other hand, Comparative Example 1 is inferior in strength after heating at 1000 ° C. for 30 minutes and then aging treatment.
In all of Examples 2 and 6 and Comparative Examples 1 and 7, the strength and conductivity values after heating at 1000 ° C. for 30 minutes and then aging treatment were heated at 850 ° C. for 30 minutes, and then aging treatment. There was no significant difference between the strength and conductivity values after the test.

Claims (7)

One or two kinds of Ni and Co are contained in an amount of 1.0 to 4.0% by mass, Si is contained in an amount of 0.2 to 1.2 % by mass , and the total content of Ni and Co [Ni + Co] and the content of Si [ Si] ratio [Ni + Co] / [Si] is 3.5-5, the balance is made of Cu and inevitable impurities, 0.2% proof stress is 300 MPa or more, and has excellent bending workability, 850 ° C. Part of the process for manufacturing heat-radiating parts with 0.2% proof stress of 300 MPa or more and conductivity of 25% IACS or more after aging for 30 minutes after heating at 500 ° C for 2 hours. The copper alloy plate for heat-radiating components characterized by including a process of heating to 650 ° C. or more and an aging treatment. Furthermore, 1 type or 2 types of Sn and Mg are contained in the range of Sn: 0.005-1.0 mass% and Mg: 0.005-0.2 mass%. The described copper alloy plate for heat dissipation parts. Furthermore, Zn is contained 2.0 mass% or less, The copper alloy plate for heat radiating components described in Claim 1 or 2 characterized by the above-mentioned. Furthermore, 0.5 mass% or less in total containing 1 type, or 2 or more types among Al, Mn, Cr, Ti, Zr, Fe, P, and Ag is contained in any one of Claims 1-3 characterized by the above-mentioned. The described copper alloy plate for heat dissipation parts. After processing the copper alloy plate for heat radiating components according to any one of claims 1 to 4 into a predetermined shape, a process of heating to 650 ° C or higher is performed, followed by an aging treatment, and 0.2% of 300 MPa or higher A method of manufacturing a heat dissipation component, characterized by obtaining a heat dissipation component having a yield strength and a conductivity of 25% IACS or higher. 6. The method of manufacturing a heat dissipation component according to claim 5, wherein an Sn coating layer is formed on at least a part of the outer surface of the heat dissipation component after the aging treatment. 6. The method of manufacturing a heat dissipation component according to claim 5, wherein after the aging treatment, a Ni coating layer is formed on at least a part of the outer surface of the heat dissipation component.