JPH04176835A - Aluminum alloy excellent in wear resistance - Google Patents

Abstract

PURPOSE:To obtain an Al alloy having superior plastic workability and excellent in wear resistance by specifying a composition consisting of B, Mn, Fe, Cu, Mg, Cr, Ti, Zr, and Al and also dispersing B or its compound finely and uniformly. CONSTITUTION:This alloy is an Al alloy which consists of, by weight, 0.02-1.0% B, 0.05-2.0% Mn, further one or more kinds among 0.05-1.5% Fe, 0.05-2.0% Cu, 0.05-1.5% Mg, 0.03-0.5% Cr, 0.01-0.5% Ti, and 0.03-0.5% Zr, and the balance Al with inevitable impurities and in which B or its compound with a size of <=100mum is uniformly dispersed by >=10pieces per square centimeter and superior wear resistance is provided. This Al alloy can be suitably used, e.g. for magnet roller for copying machine. Moreover, the above alloy has superior plastic workability and enables thin wall porthole extrusion, and the necessity of surface treatment, such as anodizing treatment, can be obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an aluminum alloy with excellent wear resistance used in magnetic rollers of copying machines and the like.

[Conventional technology]

Conventionally, when using aluminum for parts that are subject to friction,
Aj+-8i alloy made by adding a large amount of Si to aluminum, or Cu, Mg, Ni to improve strength.
Alloy systems with additions such as Tsuki S 2218 alloy and Tsuki 3
4032 alloy or Al-Mg-8i
AA-Mn alloys and AA-Mn alloys have been used to form coatings with excellent wear resistance on their surfaces.

Copying machines use many rollers such as photosensitive drums and developing rollers, and especially the developing roller and fixing roller require wear resistance, but JIS 22+8 alloy and Tsuki 34032 alloy are used for this purpose. Because it is difficult to manufacture thin-walled pipes, it is necessary to use It33003 alloy or Moon5606.
Used by surface treatment or composite of different materials on the surface of 3-alloy pipe.

[Problem to be solved by the invention]

However, the above-mentioned copier parts require a large amount of cost for surface treatment, and using a wear-resistant aluminum alloy such as 4032 alloy for these purposes is difficult due to wall thickness and boat hole extrusion. It is difficult because it is impossible.

[Means for solving problems]

In view of this, as a result of various studies, the present invention has developed an aluminum alloy with good plastic workability and excellent wear resistance.

That is, the alloy of the present invention has B002 to 1,0·vt%.

Mn 0.05-2. Including Ovt% and further Fe0
．． 05-1.5 wj%, Cu 0.05-2. Ovt.
%, Mg 105-1.5wt%, Cr 0.03
~(1,5w(%, Ti [), [ll-0,5vj
%, Z + 0.03 to 0.5 wt% of any one type or two or more types, the balance consists of Al and unavoidable impurities, B or its compound with a size of 100 μm or less and 10 per 1 d. It is characterized by uniformly dispersing more than 1,000 particles.

[For production]

The present invention is to develop an aluminum alloy with good plastic workability and excellent wear resistance, and when high plastic workability is required such as in copying machines, it has both workability and wear resistance. It has the following characteristics, and conventional surface treatment can be omitted.

However, the composition of the alloy of the present invention was limited as described above.
This is due to the following reasons.

B is added to improve the wear resistance of the alloy, and its content is defined as 0.02~], Qrt% (hereinafter referred to as if
(abbreviated as %) is because if it is less than 0.02%, there is no clear effect on wear resistance, and if it exceeds 1.0%, it is impossible to disperse it as uniform particles. , the machinability deteriorates and parts cannot be machined. Since the state of dispersion of B or its compound affects the improvement of wear resistance, it is desirable to uniformly disperse B or its compound with a size of 100 μm or less and 10 or more particles per 1 d.

Mn is added to improve the strength of the alloy, but the reason why its content is limited to 0.05 to 2.0% is because
This is because if it is less than 0.05%, almost no strength improvement effect is observed, and if it exceeds 2.0%, extrudability deteriorates and corrosion resistance also decreases.

The alloy of the present invention further contains 0.05 to 5% Fe.

CuG, (15-2.0%, Mg0
．． 05-1.5%.

C 0.03-0.5%, Ti0. O1~0.
5%.

Zr'0.0' Contains one or two or more types within the range of 3 to 0.5%, and Fe, Co, and Mg mainly improve the strength of the alloy, but below the lower limit, the strength does not improve. Almost no effect is observed, and when the upper limit is exceeded, extrudability deteriorates and corrosion resistance decreases. Also Cr.

Although Ti and Zr are mainly effective in improving stress corrosion cracking resistance and grain size, their effects are insufficient below the lower limit.
If the upper limit is exceeded, coarse crystallized substances are generated, leading to a decrease in toughness.

〔Example〕

The present invention will be described below with reference to Examples.

Example 1 An alloy of the present invention containing five types of B shown in Table 1 and a comparative alloy containing five types of B were cast into an ingot with an outer diameter of 220 mm by a DC casting method. This was subjected to homogenization treatment at 580° C. for 12 hours, and then hot extruded into a shape having a rectangular cross section with a thickness of 10 −2 and a width of 50 mm.

Odate type specimens were fabricated from this material and abrasion tests were conducted. The test was conducted under two conditions: no lubrication and a state in which machine oil was continuously sprayed. The specific wear amount was determined from the size of the indentation created by pressing the material over a certain distance. The friction speed is constant at 3.5 m/sec, the friction distance is 200 m without lubrication, 1,200 m with machine oil lubrication, and the pressing load is 10 m/s.
It was set as a constant kg. The results are shown in Table 2.

Table 1 Table 2 As is clear from Tables 1 and 2, the alloy of the present invention containing B has a specific wear amount that is less than half that of the comparative alloy that does not contain B. It turns out to be excellent.

The state of dispersion of B in the alloy of the present invention was investigated using an electron microscope, and the size was 100 μm or less, with 10 or more particles per 1 d.

Example 2 Ingots with different B dispersion states were produced by changing the solidification rate and stirring method of the molten metal during casting of the alloy having the composition of the present invention alloy Nα2,4 in Table 1. Samples were prepared in the same manner and abrasion tests were conducted. The results are shown in Table 3.

Table 3 As is clear from Table 3, even if aluminum alloys have the same composition, if B is coarsely dispersed, no improvement in wear resistance is observed.

〔Effect of the invention〕

According to the present invention, the wear resistance has been greatly improved, achieving wear resistance equivalent to that of conventional hard alloys, making it possible to extrude thin-walled portholes, and eliminating the need for conventional surface treatments such as alumite. It has remarkable industrial effects.

Claims (1)

[Claims] B0.02~1.0wt%, Mn0.05~2.0wt
%, and further contains Fe0.05-1.5wt%, Cu0.
05-2.0wt%, Mg0.05-1.5wt%, C
r0.03~0.5wt%, Ti0.01~0.5wt
%, Zr in the range of 0.03 to 0.5 wt%, the remainder consists of Al and unavoidable impurities, and B or its compound has a size of 100 μm or less, 1 c
An aluminum alloy with excellent wear resistance characterized by having 10 or more particles uniformly dispersed per m^2.