JPS59229453A - Copper alloy for radiator - Google Patents

Abstract

PURPOSE:To obtain a Cu alloy for a radiator with especially superior heat resistance and heat conductivity by adding a relatively large amount of Pb and a specified amount of Ag and/or Sn to Cu. CONSTITUTION:This Cu alloy consists of >0.05-1.0wt% Pb, 0.001-0.5wt% Ag and/or Sn and the balance Cu. The Cu alloy has satisfactory heat resistance as well as high heat conductivity, so the mechanical strength is not reduced even when the alloy is subjected to various heat treatments during the assembling of a radiator. Accordingly, the Cu alloy is used as a superior material for radiator for automobiles, especially for the fins of the radiator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile radiator having particularly excellent heat resistance and thermal conductivity, and particularly to a copper alloy for radiator fins.

An automobile radiator circulates liquid between the engine and the radiator as a cooling medium to adjust the temperature of the engine, dissipating heat, and the radiator fins function to dissipate heat through tubes. Therefore, a copper alloy with high thermal conductivity has conventionally been used as a radiator fin material.

However, since radiator fins are subjected to various heat treatments when assembling the radiator, poor heat resistance will reduce the mechanical strength of the fins.

The present invention is the result of research conducted in view of this.

Pb over 0.05 weight to 1.0 weight, Ag, Sn
A group consisting of one or two selected species in total amount O
We have developed a copper alloy for radiators that has excellent heat resistance and thermal conductivity and is composed of 1 to 0.15% of the weight of O, and the remainder is O and its accompanying impurities.

The effect of the alloy components in the copper alloy for radiators of the present invention and the reason for limiting the amount added will be explained. The purpose of adding PI) is to improve strength and corrosion resistance, and the reason why the range is limited to more than 0.05 weight units to 1.0 weight units is because below 0.05 weight units, the above effects are almost absent. This is because it cannot be expected, and also because if it exceeds 1.0% by weight, thermal conductivity and processability will decrease.

The reason why Ag and an are added is mainly to improve heat resistance, and the reason why the range is limited to 0001 to 0.15 weight ratio is because almost no effect can be expected if the weight ratio is less than 1001 weight ratio.

This is because if the weight ratio exceeds 0.015, the thermal conductivity decreases.

Next, examples of the alloy of the present invention will be described.

EXAMPLE Alloys having the various compositions shown in Table 1 were melted, hot-rolled, annealed as appropriate, and then cold-rolled to form a plate with a thickness of +0.5 m and subjected to testing.

Heat resistance was evaluated by heating the sample material at a predetermined temperature for 30 minutes and evaluating the softening temperature at the point where the 2 strength becomes 80 times the value before heating. In addition, thermal conductivity was evaluated by measuring electrical conductivity, which has a positive correlation with thermal conductivity. The conductivity measurement is based on JIS H0505.
I followed the instructions. The results are shown in Table 2.

As can be seen from Table 2, the alloy of the present invention is an alloy with excellent heat resistance and thermal conductivity.

Table 1 Unit double weight section 3- Table 2 −4=

Claims (1)

[Claims] PbQ, 05 weight over - 1,0 weight connection and Ag, 8n
A group consisting of one or two selected species in total amount r
Copper alloy for radiator, consisting of 1,001 to 11.15 weight fraction and the balance O and impurities accompanying it.