JPS6086229A - Highly conductive spring material - Google Patents

Abstract

PURPOSE:To prepare a spring grade copper alloy having conductivity not inferior to that of Be-Cu in low cost, by applying precipitation hardening treatment to deoxidized phosphate copper to which a specific amount of Fe and Cr are added. CONSTITUTION:0.05-0.15% of Fe, 0.02-0.04% of P and 0.10-0.20% of Cr are added to oxygen free copper of which the oxygen content is reduced to 10ppm or less through deoxidizing treatment and alloyed with copper to simultaneously precipitate iron phosphate and Cr in copper. By this method, a highly conductive spring grade copper alloy material not inferior to Be-Cu in practicality is obtained.

Description

[Detailed description of the invention] This invention still relates to conductive springs.

It is not uncommon to use springs for 2 or 4 electrical circuits in electrical equipment, including switch stations. In that case, using a splashing material with good electrical and thermal conductivity is essential for making electrical equipment more compact and smaller. However, at present, it is still difficult to create conductive splash materials suitable for fillings8.
Currently used alternative electrical spring materials include beryllium square and phosphor bronze. Beryllium copper has excellent spring properties, but its electrical and thermal conductivity is 1.0 for silver and 0 for copper.
．． Compared to 93, it is about 0.15 to 0.55 lower. Phosphorus'1r
Copper is inferior to beryllium copper in both spring properties and conductivity, but
Currently, it is the most commonly used because it is inexpensive.

This invention does not use expensive beryllium, has higher conductivity than beryllium copper, and has a strength of 60 to 70K compared to phosphor bronze.
The purpose is to develop spring materials that do not fall below g/-.

The use of copper as a base material for high conductivity springs does not work. Therefore, the goal of development was to find an element that would strengthen copper with a cheaper element than beryllium, but whose conductivity would not be so great.

However, any element, copper or phosphorus! It turned out that if you strengthen it to a level higher than Beryllium Copper, 1 its obscurity will fall into pardon, and you will never be able to achieve the goal of obtaining the 24 Notes of Legend that is higher than Beryllium Copper.

Therefore, instead of strengthening the copper as a normal alloy, we decided to use a precipitation hardening process that strengthens the copper by simply adding a trace amount of an element. In addition, in order to improve the conductivity of copper, we thoroughly deoxidize it to create a normal acid-free wood-like acid content of 100 to 200 PP.
I thought about keeping M below 110PP.

It has recently been discovered that an alloy that closely follows this new policy has been discovered and is now commercially available. It is made by adding a small amount of magic to the traditional Tang deoxidation, and by precipitating iron phosphide, it is strengthened to the same level as annealed copper. This alloy is superior to the 1.04
It has a high heat conduction 4 fart. Conventional pure copper is 0.9
It is 4.

The base phosphorus deoxidized steel was 1.06, but the steel was 0.
．． It is lowered to 1.04 by adding 1% to the tea and processing it. However, the strength increases from 35 I'4/+- to 45 kyg/- by adding 0.1% iron. If you use hardened gold, you can achieve an incredible increase in strength with a slight decrease in conductivity.

Now, in this invention, not only iron is applied to the above-mentioned candle-deglaring copper and precipitated and hardened, but also 0.1 to 0.2% of chromium is added and precipitated. Since the precipitation temperature is around 400°C, simultaneous precipitation is possible.

If the phosphorus is removed, conventional techniques are sufficient for adding chromium to the copper, solution treatment, and precipitation treatment. Since alloys of copper and 3-6% chromium are conventionally made, there are no technical complications.

By chance, the ingredients and properties of an alloy that satisfies the purpose of this invention are as follows.

Chemical components (wt%) Fg 0.05-0.15, P 0.02-0.04,
CrO, 10-0.20, balance Cw.

The phosphorus-deoxidized copper used as the base has a pyrolyte content of 110 PP or less. Then, as described above, iron phosphide and chromium were precipitated at 400°C.

The S* rate (% lAC3, 20 °C) of the alloy thus obtained was 46-81, and the thermal conductivity (d/cnr, sec, °C
) is 0.65 to 0.84, tensile strength i(f/mA
) obtained test plantings of 51-75. Although there is considerable fluctuation, this is an indication that it will be possible to stabilize the value at the higher value in the future. Therefore, in spite of the original purpose, it satisfies the requirements for a highly conductive spring material that has a conductivity higher than that of beryllium copper and a strength comparable to that of copper.

Note that the precipitation treatment does not necessarily precipitate iron phosphide and chromium all at once; they may be precipitated separately. Although the precipitation temperature is around 400°C, the precipitation hardening process is left to the metallurgical engineers who carry out the precipitation hardening process to obtain the highest strength with the minimum amount of Fg and Cr.

This invention is made by adding trace amounts of iron and chromium to phosphorus-deoxidized copper, thoroughly reducing the oxygen content, and performing a precipitation hardening treatment, making it cheaper and more practical than Pe-IJ-IJ-Neem copper. A highly conductive splashing material was obtained.

By reducing the amount of v-storage to the minimum, we were able to maintain the conductivity of the base copper to the maximum. Since the alloy components are 0.2 to 0.3% in total of iron, phosphorus, and chromium, the decrease in the conductivity of the copper was minimized. Then, by precipitating a small amount of these elements into the steel, it is hardened to the maximum extent possible, giving it the strength it deserves as a spring material.

With the advent of this Shoden 2S spring material, it becomes possible to downsize or increase the capacity of the four-barrel springs of all Kanki weapons.

Claims (1)

[Claims] Iron: 0.05-0.15, Phosphorus: 0.02-0.04, Chromium: 0.10-0.20, remaining acid content: 10 P
Anything less than PM is raw steel, and iron phosphide and chromium are precipitated into the steel! Material for pipe conductive spatter.