JPS5815528B2 - sex - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in N1-P-Cu alloys.

Ni-P-Cu alloys have excellent corrosion resistance, high electrical conductivity, and high thermal conductivity, and are mainly used for structural members such as grids of extremely high frequency receiver tubes.

In this alloy, the content of Ni and P is usually 1
, 25 to 1.5% is used, and further Ni
It is known that a ratio of P and P of about 5:1 exhibits the best mechanical strength.

However, this alloy has the disadvantage that the crystal grains become coarse at high temperatures of 600° C. or higher.

This N1-P-Cu alloy was subjected to solution treatment at a temperature of 700-800.

After rapid cooling, precipitation hardening treatment is performed at 500 to 550°C to obtain strength, but in this case, crystal grains become coarse during solution treatment, resulting in rough surface during processing.

Furthermore, the grid of the ultrasonic receiving tube mentioned above is usually machined by electric discharge machining.

Therefore, since the steel is heated to a higher temperature during processing, the crystal grains near the processed portion become significantly coarser, resulting in a low F strength and poor workability.

The present invention improves on these difficulties, and by suppressing the coarsening of crystal grains at high temperatures, N1-P-Cu alloys with fine crystal grains can be made into N1-P-Cu alloys after solution treatment and precipitation hardening. This is what we provide.

That is, NiO, 5-1.5%, P 0.1-0.
4%, Si 0.005-01%, and the remainder is substantially C.
It is characterized by consisting of 11 parts.

The reason why each component is limited to the above range is that Ni and P provide mechanical strength, but even if added beyond the above range, the strength will not increase much and the electrical conductivity will decrease. It is not preferable because it causes deterioration, and if it is too small, it will not be effective.

Si has the effect of preventing coarsening of crystal grains at high temperatures, and at the same time improves strength and provides properties rich in ductility.

However, if Si is added in an amount of 0.005% or more, it exhibits its effect, but if it is added in an amount exceeding 0.10%, it has an adverse effect such as deteriorating the conductivity, and there is no effect in reducing the amount added.

The present invention will be explained in detail below with reference to Examples.

An alloy prepared by blending Ni, P, and Cu in the composition shown in Table 1 and melting the mixture in a vacuum was used as a sample.

These samples were then hot- and cold-rolled into 0.5t plates.

This was subjected to solution treatment at 800°C for about 30 minutes, and after rapid cooling, precipitation hardening treatment was performed at 500°C for 3 hours.

The grain size and tensile properties of the sample thus obtained were measured.

The surface condition of the material during the tensile test was also investigated.

The results are shown in Table 2.

As is clear from Table 2, the alloy of the present invention (Sample Shop 2.3.
In case 4), the crystal grains were not coarsened even after the above treatment.

Therefore, the tensile strength is improved and the elongation rate is also excellent.

Also, there is no rough skin during the tensile test (conventional example (sample JI6.
It has superior workability compared to 1).

In the alloy of the present invention, Si intermetallic compounds are finely dispersed by adding Si, and this is considered to be a factor in improving properties such as tensile strength.

As described above, the alloy of the present invention does not have coarse grains even after being subjected to ordinary solution treatment and aging treatment (it has excellent strength and ductility).

Therefore, it goes without saying that it is suitable for receiving tube solids for extremely high frequency waves, and the applications of this type of alloy can be further expanded.

Claims (1)

[Claims] Nickel (Ni) 0.5-1.5% at 1% by weight,
Phosphorus (P) 0.1-0.4%, silicon (Si) 0.
A precipitation hardened copper alloy containing 0.005 to 0.1% and the remainder substantially consisting of copper (Cu).