JPS59197543A - Tough abrasion resistant copper alloy - Google Patents

Abstract

PURPOSE:To provide a copper alloy extremely excellent in toughness and abrasion resistance bringing no hindrance even if using the same as a slide member under high load, constituted of Cu, Al, Ti and Sn in a specific amount and Zn. CONSTITUTION:A copper alloy consists of, on a wt basis, 55-70% Cu, 2-8% Al, 0.1-3.0% Ti, 0.1-3.0% Sn and the remainder of Zn. This alloy has excellent toughness and abrasion resistance as well as a fine crystal structure and develops characteristics not generating the deterioration in abrasion resistance caused by heating, the growth of a crystal particle or embrittleness. Therefore, even if it is used by sliding the same under high load, there is no hindrance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a strong and wear-resistant copper alloy having excellent toughness and wear resistance.

Conventionally, among the copper alloys used as wrought materials, one with high tensile strength S is, for example, JIS H3250 in the case of brass.
-C6783 (3 types of high-strength brass rods), CI for wear-resistant alloys
) 8674, itJ I 5r- in aluminum bronze system
13250-C6241 (Special Alcimini Bronze Front Copper Rod 3
Alloys such as species) are known.

These copper alloys have high tensile strength and high toughness, and are also superior in wear resistance to other well-known copper alloys.

However, it is still insufficient when used, for example, while sliding under heavy loads.

For this reason, there has been a desire for a copper alloy with even greater toughness and wear resistance.

The present invention was created in response to the above-mentioned demands.
The objective is to provide a strong and wear-resistant copper alloy that has even better toughness and wear resistance, and can be used in 4i and 7 motions under high loads without any problems.

In order to achieve the above object, the inventor of the present invention has repeatedly conducted numerous studies and experiments on combinations of copper, aluminum, titanium, tin, zinc, etc., and has developed a new combination ratio as described below. The present invention was completed by developing a copper alloy having the following characteristics.

The tough and wear-resistant copper alloy of the present invention has a basic composition of 55 to 70% by weight of copper, 2 to 8% by weight of aluminum, 0.1 to 3.0% by weight of titanium, and 0.1 to 3.0% of tin. The weight percent and balance consists of zinc and unavoidable impurities.

Regarding copper and aluminum, when the copper content exceeds 70% by weight and the aluminum content is less than 2% by weight, the amount of β phase in the matrix decreases, and conversely the amount of α phase increases. Therefore, the copper content should be 70% by weight or less, and the aluminum content should be 2% by weight.
That's all.

However, if the copper content is less than 55% by weight and the aluminum content exceeds 8% by weight, not only the wear resistance improvement effect will be reduced but also hot workability and toughness will be reduced. Therefore, the copper content is 55% by weight9. Above, the aluminum content is 8% by weight or less.

Since tin and titanium are simultaneously crystallized as fine intermetallic compounds, they have the effect of refining the crystal structure and dramatically improving toughness and wear resistance.

However, if the contents of tin and titanium are each less than 0.1% by weight, the desired improvement effect due to the above action cannot be obtained. On the other hand, even if the content of tin and titanium exceeds 3.0% by weight each, further wear resistance cannot be expected, and on the contrary, castability decreases and toughness and manual plastic workability decrease. The contents of tin and titanium are each 0.1 to 3.0% by weight.

Zinc is added to improve the flowability and mechanical strength during casting, but oxygen f7. It is also possible to significantly reduce the loss of titanium, and for this reason, the balance is made of zinc.

It goes without saying that the purpose of the present invention can be fully achieved even with a copper alloy having the above-mentioned basic composition.
It may be contained in an amount less than % by weight to improve machinability. Even if lead is added, the wear resistance etc. of the uninvented copper alloy will be inhibited (j) However, if lead is added in an amount of 2% or more, hot workability will be impaired, so if lead is added, It is necessary to suppress it to less than % by weight.

Also, manganese is a component that dissolves in brass. Is there any possibility that the addition of this will inhibit the wear resistance etc. of the copper alloy of the present invention? 4 ii Since containing 4% or more of 2 will increase the oxide slag in the molten metal during melting. When manganese is contained, it needs to be suppressed to less than 4% by weight.

Others: iron, cobalt, silicon, zirconium, aluminum
1Jum, chromium, etc. form a composite compound by interacting with the components constituting the intermetallic compound of the copper alloy of the present invention and contribute to improving wear resistance, but for iron, 1.5 % by weight, or 1% by weight for other components, it is undesirable because it causes pinholes to occur during casting, and when these components are included, the above upper limit values are exceeded. It is desirable to avoid this.

As described above, the strong and wear-resistant copper alloy of the present invention has excellent toughness and wear resistance, and also has a fine crystal structure, and the wear resistance deteriorates due to heating and the crystal grains do not deteriorate. It exhibits the property of not causing growth or embrittlement.

Therefore, there is no problem even if it is used slidingly under high loads.

In addition, it can be used not only as a forged product but also as a hot forged product, and can be used in a wide range of applications.

Therefore, it is an industrially extremely useful copper alloy.

Specific examples of the tough and wear-resistant lead alloy of the present invention will be described below.

In order to compare the tensile strength, elongation, and wear resistance of the copper alloy according to the present invention and conventional copper alloys, eight types of copper alloys having the chemical compositions (wt%) shown in Table 1 below were manufactured.

Table 1 Chemical Composition In the above table, E1 to G5 are copper alloys according to the present invention.

Dark 6 is JIS standard high-strength brass rod, E7 is CI) A
674 and E8 are copper alloys of three types of aluminum bronze rods according to the JIS standard.

Each copper alloy was produced by medium frequency melting in the atmosphere.
In addition to melting each Ky,
! The material was cast into a 44 mm round bar material by hot extrusion.

A portion of each material is used for tensile testing and
As shown in Figures 1 and 2, the remaining part has an inner diameter D1 of 16rnmp, an outer diameter D2 of 32rnmp, and a thickness 'r of 10m.
Sample 1 for the wear test was prepared by cutting into a ring shape of m.

Therefore, the rolling element 2 was manufactured according to 5US3Q4 with an inner diameter d1 of 16 mu - an outer diameter d2 of 48 mu, and a thickness of 10 wn.
A wear test was conducted in which the sample 1 was pressed under a load W of 50 cm, rolled under oil lubrication at a rotational speed of 2001' pin in the direction of the arrow, and the wear loss per 106 revolutions was measured.

Table 2 shows the test results for each copper alloy.

Table 2: Toughness and wear resistance The copper alloys according to the present invention (Mud 1 to 5) are different from conventional copper alloys (
It can be seen that the tensile strength, elongation, and abrasion loss are much better than 56-f)8).

It can thus be seen that the copper alloy according to the present invention has excellent toughness and wear resistance.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the configuration of the sample and rolling elements used in the wear test. FIG. 2 is a side view thereof. 1...Sample 2--Rolling element test machine Smooth/slip wear test load
Weight: 50kqf Rotation speed: 20Orpm

Claims (1)

[Claims] A tough, wear-resistant copper alloy consisting of 55 to 70% by weight of copper, 2 to 8% by weight of aluminum, 0.1 to 3.0% by weight of titanium, 0.1 to 3.0% by weight of tin, and the balance being zinc and unavoidable impurities. .