High silicon gradient composite aluminum alloy cylinder sleeve material and preparation method thereof

An aluminum alloy and gradient technology, which is applied in the field of high-silicon gradient composite aluminum alloy cylinder liner and or bushing material and its preparation, can solve the problem of insufficient high temperature resistance and tribological properties of the alloy, high temperature of the alloy, low mechanical properties at room temperature, and poor quality. Consistency and poor uniformity of mechanical properties, etc., to achieve the effect of superior cylinder liner processing surface quality and use effect, beneficial tribological properties, and superior product performance

Inactive Publication Date: 2010-05-19
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A high-silicon aluminum alloy cylinder liner material announced by British Patent GB972095 contains transition group elements such as copper, nickel, iron, and manganese, but the content is low, which will make the alloy's high temperature resistance and tribological properties insufficient; and it is difficult to obtain by die-casting. Small and uniform high-hardness compound particle phase and high silicon particles will cause poor processing performance; there are also problems of insufficient feeding pressure and internal pores, which cannot be strengthened by heat treatment, etc.
British patent GB2302695, European patent EP367229 and US patent PS4155756, 4938810 do not contain transition group elements such as nickel, iron, manganese, and the s

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  • High silicon gradient composite aluminum alloy cylinder sleeve material and preparation method thereof
  • High silicon gradient composite aluminum alloy cylinder sleeve material and preparation method thereof
  • High silicon gradient composite aluminum alloy cylinder sleeve material and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0082] Preparation method of high-silicon gradient composite aluminum alloy cylinder liner:

[0083] Component design and precise batching: carry out precise batching according to the composition formula of the alloy of the present invention. In the batching method, the high melting point alloy elements such as silicon, iron, nickel, manganese, copper, vanadium, strontium, rare earth, etc., are prepared by the method of master alloy, so that these high melting point alloy elements can be added to the low melting point. In aluminum, namely Al-40% Si, Al-30% Fe, Al-20% Ni, Al-50% Cu, Al-15% Mn, Al-15% V, Al-10% Sr, Al-10 %RE, Cu-10%P intermediate alloy charge form for batching. The melting point of magnesium is similar to that of aluminum, and the ingredients are prepared in the form of pure metal charge. After batching with the charge of master alloy, if the amount of aluminum is insufficient, it will be supplemented with the charge of pure aluminum.

[0084] In the control ...

Embodiment 1、 Embodiment 2 and Embodiment 3

[0095] The material of the present invention and the product that adopt material of the present invention and above-mentioned preparation method to manufacture have the characteristics that:

[0096] Each embodiment chemical analysis of table 1 (wt %)

[0097] Example

[0098] Example

[0099] Take Example 2 as an example to do batching calculation:

[0100] 1) the chemical composition of embodiment 2 is as follows:

[0101] Si: 20.5%; Fe: 1.50%; Ni: 2.00%; Cu: 2.00%; Mg: 0.50%; Mn: 0.50%; V: 0.35%; Sr: 0.08%; RE: 0.08%; : The balance of the aluminum alloy.

[0102] 2) The amount of each alloy element required in the alloy is:

[0103] Calculate the ingredients according to 100 kg of furnace charge:

[0104] Si: 20.5 kg; Fe: 1.50 kg; Ni: 2.00 kg; Cu: 2.00 kg; Mg: 0.50 kg; Mn: 0.50 kg; V: 0.35 kg; Sr: 0.08 kg; RE: 0.08 kg; P: 0.07 kg. Al: The balance is 100 kg - the total algebraic sum (27.58 kg) of the above alloying elements is 72.42 kg.

[0105] 3) ...

Embodiment 4

[0143] The embodiment 2 material and cylinder liner sample pieces that adopt material of the present invention and preparation method to manufacture have the characteristics that:

[0144] Its physical performance characteristics:

[0145] 1) thermal conductivity

[0146] At room temperature of 25°C, 100W / m / k; at high temperature of 250°C, 120W / m / k.

[0147] 2) Expansion coefficient

[0148] At room temperature 25°C, 16.5×10 -6 1 / °C; at a high temperature of 300°C, 17.95×10 -6 / °C.

[0149] 3) Density

[0150] At room temperature 25°C, 2.80g / cm 3 .

[0151] The surface hardness characteristics of the cylinder liner:

[0152] 1) At room temperature 25°C, HB250≥160.

[0153] The processing surface characteristics of the cylinder liner:

[0154] 1) Surface roughness Ra 0.6-1.2μm;

[0155] It simulates the tribological performance characteristics of engine mating conditions:

[0156] Table 4 Tribological performance data of high-silicon gradient composite aluminum allo...

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Abstract

The invention discloses a high silicon gradient composite aluminum alloy cylinder sleeve material and a preparation method thereof. The material comprises the following components in percentage by weight: 13.0-27.0 percent of Si, 0.3-2.0 percent of Fe, 0.5-5 percent of Ni, 1.5-4.0 percent of Cu, 0.3-0.8 percent of Mg, 0.3-0.8 percent of Mn, 0.1-0.5 percent of V, 0.05-0.1 percent of Sr, 0.04-0.1 percent of RE, 0.01-0.1 percent of P and the balance of Al. The preparation method comprises the following steps of: carrying out composition design and accurate batching on the materials with preliminary alloys; fusing, covering, refining and inoculation treating; centrifugal casting for forming; thermal treating; and machining and hone machining. The invention is characterized in that a gradient tribology function composite material is obtained by adopting a Sr-P-RE ternary composite modification treatment technology and a centrifugal casting technology controlled by a variable frequency motor, the preparation cost is lower than that of spray deposition technology and a powder metallurgic technology, and the mechanical property and the tribology property of a product is more advantageous than that of the product prepared by a die casting technology; moreover, the prepared cylinder sleeve has more advantageous processing quality and usage effect, and has the advantage of good compatibility with a piston aluminum alloy auxiliary cylinder.

Description

technical field [0001] The invention belongs to the technical field of metal alloys and their preparation, and in particular relates to a heat-resistant, wear-resistant, low-expansion coefficient high-silicon gradient composite aluminum alloy cylinder liner and or bushing material and a preparation method thereof. Background technique [0002] Engine cylinder clearance determines and affects the important parameters of engine power density, exhaust gas pressure, fuel consumption and fuel economy indicators. Cast iron, steel cylinder liner materials and piston aluminum alloy materials have poor thermophysical compatibility, which makes it difficult to further reduce the cylinder matching gap, and cannot efficiently and economically solve the technical problems of high power density and high economical engine power. The high-silicon aluminum alloy cylinder liner has good thermophysical compatibility with the piston aluminum alloy material, which can significantly reduce the cy...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/00B22D13/02
Inventor 孙廷富吴岳壹王存龙陈大辉彭银江高明灯侯林冲李冬梅郭珉
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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