JPS60103145A - Aluminum alloy for casting with superior heat resistance and wear resistance - Google Patents

Abstract

PURPOSE:To obtain an Al alloy for a casting with superior heat resistance and wear resistance by adding specified amounts of Si, Cu and Mn to Al. CONSTITUTION:An Al alloy contg., by weight, 16.5-22.5% Si, 5.5-8.0% Cu, 0.5-4.5% Mn and impurities including <=1.3% Fe is used as an Al alloy for a die casting process. A die cast product of the Al alloy has superior heat resistance and wear resistance, and it is used as an extremely superior material for a piston or the liner of an engine block.

Description

[Detailed Description of the Invention] The present invention has excellent heat resistance and wear resistance! J, J Regarding aluminum alloy for objects.

In recent years, aluminum alloys have come into widespread use as materials for members such as pistons and engine block liners that require not only wear resistance but also heat resistance, that is, cylinder temperature strength.

Conventionally known aluminum alloys for die casting that have excellent wear resistance include A-man standard 390 alloy.
The old one is 16.0 to 18.0 heavy.

Cu at 4°O~5. Ojl'＜Noii,'
% * Mg o, so ~ o, b 5 f
M.

1i: It is an aluminum alloy containing 0.6 to 1.0% of F(+), but the cast products manufactured by this alloy are inferior in heat resistance, and conventionally known products with superior heat resistance. Examples of aluminum alloys for casting include JIS standard AC13A alloy (Sl'j 1 1.
0 to 1 3. ONlj'r-%, Cuf O,
8~1.3 'iik%, Mg 04]~
1. 3mfi%, N I (i1″ 1.0~2
．． Aluminum alloys containing less than 0-8 m% of Fe and cast iron products made from this alloy had poor wear resistance.
Since C13A alloy contains the lower part of the cylinder price, the price of the product is affected, and when it is scrapped after reversal, it is difficult to distinguish it from products of other alloys, and Ni is mixed into unnecessary alloys. This also had the disadvantage of making it difficult to manufacture a stable alloy composition. Therefore, when parts that require wear resistance and heat resistance, such as pistons and engine block liners, are manufactured using conventionally known aluminum alloys, significant wear occurs on the sliding surfaces, or the parts are exposed to high temperatures during operation. There were drawbacks such as unbalanced deformation due to insufficient strength and poor operation when the product was used.

The present invention solves the above-mentioned drawbacks and provides an alloy with a composition suitable for parts that require sufficiently favorable operating conditions not only at high temperatures but also when subjected to significant sliding wear. It is something to do. 9. In the present invention, Sl is 16.5 to 225% by weight and Cu is 5.5 to 8. O
iM%, Mn'jz0.5 to 45 m, and the balance is A, 4 and ordinary unavoidable impurities, and the upper limit of the content of Fe among the unavoidable impurities is 1.3
It is an aluminum alloy for castings with excellent heat resistance and wear resistance.

The reasons for limiting the components contained in the alloy of the present invention will be described below.

St is necessary to form primary silicon which imparts wear resistance, and as soon as its content is reduced to less than 16.5 air volume, seizure will be prevented during sliding. Also that is 2Z
If it is more than 5 layers, the primary silicon becomes coarse and the ratio of coarse silicon to the matrix increases, which is undesirable because the mechanical strength decreases.

Cu strengthens the matrix, prevents primary silicon from lifting up during sliding, brings about uniform contact with the mating member, and imparts favorable wear resistance. If it is less than 5.5% by weight, the reinforcement of the matrix is insufficient and lifting of primary silicon cannot be prevented completely, making it impossible to impart desirable wear resistance. Furthermore, if the main amount is 8.0 or more, the heat resistance will be impaired, which is not preferable.

Mn is A, /: -Ain -Fe system or IJ--M
This is to form n-Fe-Si based intermetallic compounds to impart wear resistance and at the same time impart high-temperature strength from the heat-resistant northern part, and the content thereof is 0.5 or less. In this case, sufficient l1fft abrasion resistance and heat resistance cannot be imparted.

Also, if it is more than 45 times, the above AA - Mn
-Fe-based or At-Mn-Fe-Sl based intermetallic compounds are formed thickly, which is undesirable because it lowers room temperature strength.

Fe is an impurity element that is inevitably mixed into raw materials from scrap or tool waste during the alloy manufacturing process.

If the content is 1.3 or more, corrosion resistance and toughness will be impaired, so it is preferably 1.3 or less.

Also, when manufacturing parts using molds and manufacturing methods that are likely to cause seizure, such as die casting.

It is preferable that the content is 0.5 and the ilj amount Z or more.

Furthermore, since Mg, which is inevitably mixed in from scrap used as a raw material mainly when melting aluminum alloys, impairs castability, it is preferable to limit the content of Mg to 0.5 Mit cracking or less. It's 1.

083J up to 1 thread and Zn up to 0.3 main amount do not impair the effect of the present invention ψ.

In addition, elements such as Ti, B, or Zr that have a grain refining effect are usually added to aluminum alloys, so the alloy of the present invention contains up to 0.3% Ti.

0.035% by weight of B or up to 0.1% by weight of Zr
There is no problem even if one or more of the above is contained, since it does not impair the effect of the present invention.

Additionally, adding P to the alloy of the present invention, which has the effect of refining the primary silicon of the hypereutectic Aj-81 alloy, improves -Iψ wear resistance. There is no problem in adding it. still.

Even if 0.025% or more of P is added to the alloy of the present invention, no significant improvement in wear resistance is observed, so the upper limit is set at 0.025%.
I'll keep it to 71j's government.

Conventionally known methods can be used for manufacturing and casting the alloy of the present invention, but if a non-porous die casting method such as a low speed die casting method or an oxygen displacement die casting method is used,
It tends to have higher high-temperature strength than the normal die-casting method. This is due to the strength (J
, this seems to be because the L-lower area decreases.

Next, an example of the fifth tree brother will be shown together with a comparative example.

The aluminum alloys shown in Table 1 are melted in a conventional manner,
Die casting and mold casting.

A test piece was manufactured. Heat resistance and abrasion resistance tests were conducted using this test piece. The results are also shown in Table 1. The test conditions are as follows.

Heat resistance test conditions Tensile test machine Amsler universal test Tsuki test piece 燵, '18- Mold casting JIS Z 20014 No. gM piece tie cast mold ASTM85-52T E-f3 test bar Abrasion resistance test conditions Abrasion tester Ogoshi type rapid Wear test piece test piece dimensions 60 squares x 5 thickness test overture Emelina 1000 maximum finishing load '11 ky Friction distance 6oom Friction speed 2.24 m/sec Compatible material FC-20 From the results in Table 1, the present invention alloy ( It can be seen that Alloy No. 5-19) exhibits superior heat resistance and wear resistance compared to the conventionally known alloy (Alloy No. 1-4).

As mentioned above, the Niki-Ai-Ichio alloy has superior heat resistance and wear resistance compared to conventional alloys of this type, so it is an industrially popular alloy that can be used in many applications such as pistons and engine block liners. It is an excellent ζ alloy.

Patent applicant: Nippon Light Metal Co., Ltd.

Claims (1)

[Claims] Sl: 16.5 N2: 2.5fi amount%, Cu: 5.5
~E1.0 landscape%, containing 0.5 to 45% Mn by weight,
Contains no residual mht and normal unavoidable impurities, and among the unavoidable impurities, the upper limit of Fe-containing groups is 1.3
An aluminum alloy for castings with excellent heat resistance and wear resistance.