JPS59113155A - Vibrationproof zn alloy having excellent ordinary and high temperature strength - Google Patents

Abstract

PURPOSE:To provide a titled Zn alloy which has excellent vibrationproofness and resistance to corrosion and wear and maintains high ductility by having a specific compsn. consisting of Al, Cu, Si, Mn and Zn, etc. CONSTITUTION:A vibrationproof Zn alloy has the compsn. consisting of 15- 60wt% Al, 0.05-3% Cu, 0.5-7% Si, 0.01-0.8% Mn, and contg. further 0.005- 0.12% 1 or 2 kinds of P and Na according to need and consisting of the balance Zn and unavoidable impurities. Said alloy has excellent vibrationproofness, corrosion resistance, wear resistance and ductility and maintains high strength and vibrationproofness not only at an ordinary temp. but also in the use under the condition where it is to be subjected to heating. Al among the above-mentioned compsn. components improves the vibrationproofness, Cu improves the corrosion resistance, Si improves the ordinary and high-temp. strength and suppresses the decrease in the vibrationproofness occurring in the heat hysteresis, and Mn improves the ductility and wear resistance. P and Na are incorporated according to need in the case in which higher ductility is required.

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, corrosion resistance, and wear resistance, and also maintains high ductility.

Conventionally, Zn-AA-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, for example as support plates in the former and as soundproof covers in the latter. ing.

Although the above-mentioned conventional Zn-M-Cu alloy has excellent vibration-proofing properties and corrosion resistance, it is used, for example, in the support plate of the above-mentioned automobile audio equipment, because it is heated by the heat of the automobile engine. When the soundproof cover of a sewing machine is heated during the firing process, its strength not only decreases, but also becomes easily deformed.
There was a problem in that vibration-proofing properties also deteriorated due to such heating.

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.
As a result of research to obtain an n-alloy, in weight percent, M° 15-60%, Ou: 0.05-3%, Si: 0.5-7%, Mn: 0.01-0.8%. , and if necessary, one or two of P and Na: 0.005 to 0
．． 12%, with the remainder consisting of Zn and unavoidable impurities, the Zn alloy has excellent vibration damping properties, corrosion resistance, wear resistance,
We have obtained the knowledge that it not only has excellent strength and ductility at room temperature, but also maintains excellent vibration damping properties even when used under conditions of heating. be.

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 A and #M components have the effect of improving the vibration damping properties of the alloy and reducing its weight, but if the content is less than 15%, the desired effect cannot be obtained; If the content exceeds %, the vibration damping properties tend to deteriorate.
The content was determined to be 15 to 60%.

(b) Ou The Ou acid component has the effect of improving the corrosion resistance of the alloy, especially the intergranular corrosion resistance, in coexistence with M, but if its content is less than 0.05%, the desired corrosion resistance cannot be ensured. However, even if the content exceeds 3%, no further improvement effect can be obtained, so the content was set at 0.05% to 3%.

4-(c) 5i The Sl 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 a thermal history. If the content is less than 0.5 g, the desired effect cannot be obtained, while if the content exceeds 7 g, more dross will be generated during melting and casting, so the content should be set at 0.5 to 7%. Established.

(d) Mn The Mn component has the effect of improving the ductility and wear resistance of the alloy when coexisting with Sl, but if its content is 0.
If the content is less than 0.01%, the desired effect will not be obtained, while if the content exceeds 0.8%, not only will the ductility tend to deteriorate, but like Sl, dross will be generated during melting and casting. Since the amount increases, its content is reduced to 0.
It was set at 01 to 0.8%.

(e) P and Na These components have the effect of further improving the ductility of the alloy, so they are included as necessary when particularly high ductility is required. If the content is less than 0.005%, the desired ductility improvement effect cannot be achieved, while if the content exceeds 0.12%, elongation and vibration damping properties will decrease. Next, the Zn alloy of the present invention will be specifically explained with reference to Examples.

Examples Zn alloys 1 to 24 of the present invention and comparative Zn alloy 1 having the compositions shown in Table 1 were prepared by a conventional melting method.
~6 molten metal was prepared and cast into a sand mold of 150 mm x
30 mm
Solution treatment was performed under conditions of holding at a predetermined temperature within the range of 300 to 400°C for 2 hours.

Next, for the purpose of evaluating the vibration isolation properties of the above slab, the width, 6
A test piece having dimensions of layout x thickness: 2 mm x length: 100 mm was cut out, and the internal wear value Q゛] (measurement frequency: around 800 Hz) was measured using this test piece.

Similarly, from the above slab, a test piece with dimensions of width: 5 Q mm x thickness: 6 mm x length: 50 mm was cut out for the purpose of evaluating corrosion resistance, especially intergranular corrosion resistance. The maximum depth of grain boundary erosion was measured using a piece after being exposed to water vapor at a temperature of 97° C. for 48 hours.

Similarly, tensile test specimens were cut from the slab above and the parallel portion had dimensions of width: 3 mm x thickness: 2 fMl x length: 20 cm, and were tested at room temperature, 50°C, and 75°C.

Then, the 02 yield strength at 100°C and the room temperature elongation were measured.

Furthermore, from the above slab, width: 30m + nX thickness:
A test piece with dimensions of 2.5 x length: 100 m,
Final load: 3Kg, mating material: 545c.

A wear resistance test was conducted under non-lubricated conditions, and the specific wear amount at each sliding speed was measured. The results of these measurements are shown in Table 1.

From the results shown in Table 1, Zn alloys 1 to 24 of the present invention all exhibit excellent vibration damping properties, corrosion resistance, ductility (elongation), and wear resistance, and also exhibit excellent room temperature and high temperature strength. On the other hand, as seen in Comparative Zn Alloys 1 to 6, when the content of any of the constituent components (marked with * in Table 1) falls outside the scope of the present invention, the above-mentioned It is clear that at least one of the 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 wear resistance.

It also has industrially useful properties such as being ductile and retaining high strength and excellent vibration damping properties even when heated.

Applicant: Mitsubishi Metals Corporation Agent Tomi 1) Kazuo and 1 other person 10-

Claims (2)

[Claims] (1) Composition consisting of M: 15 to 60 inches, Ou: 0.05 to 3'16, Si: 0.5 to 7%, Mn: 0.01 to 0.8%, Zn and inevitable impurities: remainder. A vibration-proofing Zn alloy having excellent strength at room temperature and high temperature. (2) M: 15-60 e16, C! u:0.0
5-3%, Si: 0.5-7%, Mn: 0.01-0.8%, 1 or 2 of P and Na: 0.005-0
．． A vibration-proofing Zn alloy having excellent strength at room temperature and high temperature, characterized by having a composition (the above weight %) consisting of: 12%, zn, and unavoidable impurities: the remainder.