JPH01129940A - High heat-resistant and corrosion-resistant copper alloy - Google Patents

Abstract

PURPOSE:To improve the heat conductivity, heat resistance and corrosion resistance of the title copper alloy by specifying Te, Mn, Fe, Co, Ni, Y, Sn, Al, etc. CONSTITUTION:The high heat-resistant and corrosion-resistant copper alloy is constituted of, by weight, 0.005-0.025% Te, furthermore of one or more kinds among >=0.5% Mn, Fe, Co, Ni, Y, Sn, Al, Pb, Si, Zr and Mg and consisting of the balance Cu with inevitable impurities. The above-mentioned alloy has excellent heat conductivity, heat resistance and corrosion resistance. This alloy is used to a fin material for a heat exchanger or a lead frame for a semiconductor.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a copper alloy used for fin materials for heat exchangers or lead frames for semiconductors, and particularly relates to a copper alloy that is highly heat resistant and corrosion resistant and has excellent heat resistance, corrosion resistance, and thermal conductivity. It concerns steel alloys.

[Conventional technology]

Metal materials with high heat resistance, thermal conductivity, and corrosion resistance are generally required as fin materials for heat exchangers and lead frame materials for semiconductors, whose consumption is increasing greatly in modern times.

For example, in terms of corrosion of automobile radiator fin materials, the automobile driving environment has become increasingly harsh in recent years due to increases in nitrogen oxides, sulfur oxides, chlorine, etc. in the atmosphere. Corrosion resistance has become an important property that determines product life. In addition, from the perspective of the heat resistance of the material, the heat resistance of the soldering to the tube during the radiator assembly process is affected by the heating that occurs during the work, which softens the material and causes product defects. These points must also be considered.

As described above, corrosion resistance and heat resistance are important properties of these materials.

On the other hand, with the advancement of the times, such as further improvements in semiconductor circuit integration, the emergence of ICs with larger current capacity, and thinner lead frames due to resource conservation, higher strength and higher heat dissipation than before,
There is a growing demand for entry into the field of lead frame materials using copper alloys with high heat resistance.

As a copper alloy for automobile radiator fins or lead frames, for example, as shown in Japanese Patent Publication No. 47-4228, tin is added to copper in a range of about 0.1 to 1.0% by weight. It is used for many practical purposes. Furthermore, JP-A-59-1653, JP-A-59-16664
Tellurium-containing copper alloys disclosed in Japanese Patent Application Laid-Open No. 62-74037 and the like are attracting attention in these fields.

[Problem that the invention seeks to solve]

However, in today's world where higher standards of performance are required, copper alloys cannot meet the requirements for materials that have the three properties of heat resistance, corrosion resistance, and thermal conductivity. However, there was a desire to supply the market with materials with even higher performance.

Regarding tellurium-containing alloys having heat resistance, it has been desired to improve corrosion resistance without impairing electrical conductivity.

[Means for solving the problem] The present invention was discovered as a result of intensive studies by the inventors to solve the above-mentioned problem.
Contains 0.005 to 0.025% tellurium, and further contains one or more of manganese, iron, cobalt, nickel, yttrium, tin, aluminum, lead, silicon, zirconium, and magnesium. Contains .5% or less,
The remainder consists of copper and unavoidable impurities, and it has excellent heat and corrosion resistance, and is particularly excellent as a fin material for heat exchangers or a lead frame material for semiconductors.

[Effect]

The effects of each component contained in the copper alloy of the present invention will be explained below.

Tellurium plays the role of imparting heat resistance, but its range is 0.
．． 0.05% to 0.025% by weight or less
At 0.05% by weight, the improvement in heat resistance is not sufficient, and on the contrary, at 0.0% by weight,
This is because, even if the content exceeds 25% by weight, not only the effect of improving heat resistance is saturated, but also the workability of the alloy material deteriorates.

However, contrary to heat resistance, tellurium deteriorates corrosion resistance.

The addition of one or more of manganese, iron, cobalt, nickel, yttrium, tin, aluminum, lead, silicon, zirconium, and magnesium is to improve corrosion resistance at the content of the first two tellurium. The reason why the total content of 9 is set to be 0.5% by weight or less is that if the total content of these elements exceeds 0.5% by weight, the electrical conductivity decreases significantly.

〔Example〕

Examples of the alloy of the present invention (hereinafter referred to as the alloy of the present invention) are shown in Table 1, 1 to 14.

Table 1 lists alloys that deviate from the compositional range of the alloy of the present invention (hereinafter referred to as comparative alloys) and alloys to which 0.15% tin is added, representing conventional alloys, for comparison with the alloy of the present invention. l! +, 15 to positive 19 are shown. These alloys were melt-rolled to produce alloy plates as follows.

After electric steel is melted in a graphite crucible under high-frequency atmospheric pressure while covering the hot water surface with charcoal powder, each element calculated to have an alloy composition with the added amount of each element shown in Table 1 is melted either singly or in the form of a master alloy. At the same time, it is melted and cast to a thickness of 30+.
+m, width 80IllI1. The length is 15Q+nm and the weight is 5
An ingot of ko was obtained.

After removing the surface of these ingots by 2 ml on each side, hot rolling at 900°C to reduce the thickness from 26 mm to 121 mm, then removing the surface by 0.5 ffl on each side, and then reducing the thickness to 0.5 ml 1 liter on each side. It was cold rolled all at once.

Next, an annealing treatment was performed at 450° C. for 1 hour in an inert gas, followed by rolling to obtain an alloy plate having a thickness of 0°3111i.

Plate pieces were appropriately cut from the plate material obtained as described above and subjected to tests for thermal conductivity, heat resistance, and corrosion resistance.

Thermal conductivity was evaluated by measuring electrical conductivity, which is said to have a positive correlation.

Heat resistance was measured by cutting out a square plate with sides of 20111111 and immersing it in a salt bath at a temperature of 350°C for 5 minutes. This was done by determining the heat resistance of the material. Furthermore, the corrosion resistance was evaluated by cutting out a 25 mm wide and 901 II mm length test piece from the obtained plate material, spraying a saline solution with a concentration of 5% by weight onto the test piece at a temperature of 35°C for 30 minutes, and then spraying the test piece at a temperature of 80°C. One cycle is 30 minutes of 23RF at 80% relative humidity.
After placing the test piece in a corrosive environment that was repeated for 5 cycles (45 days), the resulting corrosion products were removed and the weight loss was measured.

Table 1 shows the results of measurements on a total of 19 types of alloys, from alloy Na1 to alloy No. 19. From the same table, it is clear that the alloy of the present invention is significantly superior to comparative alloys and conventional alloys in fields that require materials that have the three elements of electrical conductivity, heat resistance, and corrosion resistance. be.

That is, regarding the comparative alloy, the comparative alloy tooth 15, which has tellurium content M of 08OO3% by weight and the remainder is copper, is superior in corrosion resistance and electrical conductivity, but has a Vickers hardness of only 53.4L for evaluating heat resistance. This indicates that the degree of softening is high and the heat resistance is poor.

Comparative alloy 16, which has a tellurium content of 0,00% by weight and the remainder is copper, has improved heat resistance but a corrosion loss of 90%.
9/m2, the highest value in this test, indicating poor corrosion resistance.

Comparative alloy N containing 0.009 weight percent tellurium, 0.32 weight percent nickel, 0.36 weight percent silicon, and the balance being copper.
o, 17 has improved corrosion resistance, but has a conductivity of 521A
The C content is as low as 8%, which is significantly inferior to the 80-961AC 8% of the alloy of the present invention.

Tellurium 0.012ffiffi%, manganese 0.3%
Comparative alloy style 1 containing 1% by weight, 0.24% by weight of cobalt, 0.09% by weight of aluminum, and the balance being copper.
8, the corrosion resistance is improved, but the conductivity is 50
It shows that the lAC is 3%, which is inferior to the alloy of the present invention.

Conventional alloy No. 19 has an extremely high corrosion loss of 89σ/m2 and is poor in corrosion resistance.

In contrast to the above, the present alloy has a conductivity of 80 to 961 AC.
At 8%, the Vickers hardness after softening, which is a measured value indicating heat resistance, is 115 to 120.

Furthermore, the corrosion loss is 68-85 g/m2. That is, the alloy of the present invention exhibits high performance on average in these three properties measured.

〔Effect of the invention〕

As is clear from the above, the alloy of the present invention has superior performance over conventional products as a high-performance fin material for heat exchangers or lead frames for semiconductors in terms of thermal conductivity, heat resistance, and corrosion resistance. In response to the demands of industry,
It makes a great contribution to the industrial world because it can supply products that are fully satisfactory.

Claims (1)

[Claims] Contains 0.005 to 0.025% tellurium in weight%,
Furthermore, a total of 0.5% by weight of one or more of manganese, iron, cobalt, nickel, yttrium, tin, aluminum, lead, silicon, zirconium, and magnesium.
A highly heat-resistant and corrosion-resistant copper alloy consisting of the following, the balance being copper and unavoidable impurities.