JPS607015B2 - Anti-vibration Zn alloy with excellent strength at room and high temperatures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Zn alloy that has excellent room temperature and high temperature strength, excellent vibration damping properties and corrosion resistance, and also maintains high ductility.

Conventionally, Zn-AI-Cu alloys with excellent vibration-proofing properties have been used, for example, in automobile audio equipment that is exposed to vibrations and industrial sewing machines that generate significant noise, as support plates in the former and soundproof covers in the latter. Although the above-mentioned conventional Zn-AI-Cu alloy has excellent vibration-proofing properties and corrosion resistance, for example, in the supporting plate of the above-mentioned automobile audio equipment, it is heated by the heat of the automobile engine, and When a soundproof cover for a sewing machine is heated during the baking process, it not only loses its strength and becomes easily deformed, but also suffers from the problem that such heating also deteriorates its vibration-proofing properties. Met.

From the above-mentioned viewpoints, the present inventors have developed a Z-based material which has particularly excellent high-temperature strength and whose anti-vibration properties are less likely to deteriorate due to thermal history.
n alloy (as a result of research, N:1 in weight%)
5-60%, Cu: 0.05-3%, Sj: 0.5-7%, One or two of P and Na: 0.005-0
．． Zn alloy with a composition of 12% O, Zn and unavoidable impurities: the rest has excellent vibration damping properties, corrosion resistance, and ductility, and can be used not only at room temperature but also under conditions involving heating. They found that it maintains excellent strength and anti-vibration properties even when exposed to heat.

This invention was made based on the above knowledge, and the reason why the component composition range was limited as described above will be explained.

'a} The N O AI component has the effect of improving the anti-vibration properties of the alloy and reducing its weight, but if its content is less than 15%, the desired effect cannot be obtained; on the other hand, if the content is less than 15%, If the content exceeds 15%, the rust prevention properties tend to deteriorate, so the content was set at 15% to 60%.

(b) Cu The Cu component has the effect of improving the corrosion resistance of the alloy, especially the intergranular corrosion resistance, when coexisting with N, but if its content is less than 0.05%, the desired corrosion resistance cannot be secured. On the other hand, even if the content exceeds 3%, no further improvement effect can be obtained, so the content was set at 0.05 to 3%.

tc} The SiSi component has the effect of improving the room temperature and high temperature strength of the alloy and suppressing the deterioration of vibration damping properties even when used under conditions accompanied by thermal history.
．． If the content is less than 5%, the desired effect cannot be obtained, while if the content exceeds 7%, more dross will be generated during melting and casting, so the content was set at 0.5 to 7%. .

{d} P and Na These components have the effect of improving the ductility of the alloy and further increasing its strength, but if their content is less than 0.005%, the desired ductility cannot be secured. On the other hand, if the content exceeds 0.12%, the ductility and anti-vibration properties tend to deteriorate, so the content was set at 0.005 to 0.12%.

Next, the Zn alloy of the present invention will be specifically explained using examples.

Examples Zn alloys 1 to 23 of the present invention and comparative Zn alloy 1 having the compositions shown in Table 1 were prepared by a conventional melting method.
~7 lacquer baths were prepared and cast into sand molds to make coin pieces with dimensions of 15 pieces x 50 skins x 1 piece. Solution treatment was performed under conditions of holding at a predetermined temperature within the range of ~400 qC for 2 hours.

Next, with the purpose of evaluating the anti-vibration property from the above coin:
A test piece having dimensions of 6 skin x thickness: 2 willow x length: 10 ratio skin was cut out, and the internal wear value Q-1 (measurement frequency: around 800 Hz) was measured using this test piece.

In addition, from the same mirror piece mentioned above, a test piece with dimensions of 50 mm (center) x 2 side (thickness) x 50 ribs (length) was cut out for the purpose of evaluating corrosion resistance, especially intergranular corrosion resistance. Using a test piece, the maximum depth of grain boundary erosion was measured after being exposed to water vapor at a temperature of 97q0 for 48 hours. Similarly, from the above rust piece, a tensile test piece with the dimensions of the parallel part being medium: 3 sides x thickness: 2 willow x length: 2 sides was cut out, and kept at room temperature at 50 o
, 0.2% yield strength at 75oo, and 100qo,
And room temperature elongation was measured. The results of these measurements are shown in Table 1. From the results shown in Table 1, it can be seen that the present invention Z
All n alloys 1 to 23 have excellent anti-slope properties, corrosion resistance,
and elongation (ductility), and also has excellent room temperature and high temperature strength. However, as seen in Comparative Zn alloys 1 to 7, the content of any one of the constituent components (as shown in Table 1) It is clear that if the characteristics (marked with *) are outside the scope of the present invention, at least one of the above characteristics will be inferior. As mentioned above, the Zn alloy of the present invention has excellent room temperature and high temperature strength, vibration damping properties, corrosion resistance, and ductility, and in particular maintains excellent strength and vibration damping properties even when heated, making it industrially useful. It has unique characteristics.

Claims (1)

[Claims] 1 Al: 15-60%, Cu: 0.05-3%, Si: 0.5-7%, one or two of P and Na: 0.005-3%
0.12%, the balance being Zn and unavoidable impurities: A vibration-damping Zn alloy with excellent room temperature and high temperature strength, characterized by having a composition (the above weight %) consisting of: Zn and unavoidable impurities.