High-silicon aluminum alloy cylinder sleeve material and fabrication method thereof

A technology of high-silicon aluminum alloy and manufacturing method, which is applied in the field of high-silicon aluminum alloy cylinder liner materials and its preparation, and can solve problems such as poor product performance uniformity, high brittleness of high-silicon aluminum alloy, and influence on material and product performance.

Active Publication Date: 2013-04-17
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of high-silicon aluminum alloy is brittle, and its mechanical properties at high temperature and room temperature are seriously too low. Moreover, these patents all use powder metallurgy technology, which has high manufacturing costs, complicated processes, and poor performance uniformity of the products.
[0004] The high-silicon aluminum alloys disclosed in Chinese patent applications with application numbers 00124660.7 and 200510048662.7 are manufactured by spray deposition. The prepared alloy has good tribological and m...

Method used

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  • High-silicon aluminum alloy cylinder sleeve material and fabrication method thereof
  • High-silicon aluminum alloy cylinder sleeve material and fabrication method thereof
  • High-silicon aluminum alloy cylinder sleeve material and fabrication method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0136] Preparation method of high silicon aluminum alloy cylinder liner:

[0137] ① Composition 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, 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 aluminum, namely The batching is carried out in the form of furnace charge of Al-40%Si, Al-30%Fe, Al-20%Ni, Al-50%Cu, Al-15%Mn, Al-15%V master alloy. The melting point of magnesium is close to the melting point of aluminum, and the batching is carried out 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.

[0138] ②Smelting, covering and refining:

[0139] It is smelt...

Embodiment 1、 Embodiment 2 and Embodiment 3

[0201] The formulations of the three examples are shown in Table 1.

[0202] Table 1 each embodiment chemical composition (wt%)

[0203]

[0204] Take Example 2 as an example to do batching calculation:

[0205] 1) The chemical composition of embodiment 2 is as follows by weight ratio:

[0206] Si: 21.0%; Fe: 4.0%; Ni: 3.0%; Cu: 2.5%; Mg: 0.6%; Mn: 0.8%; V: 0.2%;

[0207] 2) Calculate the ingredients according to the burden weight of 120 kg:

[0208]Then the weight of each alloying element needs to be:

[0209] Si: 25.2 kg; Fe: 4.8 kg; Ni: 3.6 kg; Cu: 3.0 kg; Mg: 0.72 kg; Mn: 0.96 kg; V: 0.24 kg;

[0210] The weight of Al is: 120 kg - the sum of the weights of the above alloy elements (38.52 kg), which is 81.48 kg.

[0211] 3) Because silicon, iron, nickel, manganese, copper, vanadium and other alloy elements are added in the form of intermediate alloy charge. Therefore, it must be converted into the added weight of the master alloy. but:

[0212] ① To add 25.2 kg o...

Embodiment 2

[0240] Table 4 Example 2 Tribological performance characteristics

[0241]

[0242] Note: The tribological performance test is tested on the RFT-Ⅲ reciprocating friction and wear testing machine.

[0243] 1) The loading pressure is 800N, the loading time is 2.5 hours, the reciprocating speed is 0.5mm / s, the stroke is 50mm, and the lubricating oil is RP4652D oil;

[0244] 2) 38CrMoAl steel bar is the current engine cylinder liner material, the thickness of the nitrided layer is 0.3-0.5mm, and the hardness is greater than or equal to 76HRA; the chrome-plated cast iron bolt is the current engine piston ring material, the coating thickness is 0.08-0.12mm, and the hardness is HRC63-65; The hardness of the silicon-aluminum alloy strip matrix is ​​HBW185-200, the hardness of silicon particles is HV1050, and the hardness of the iron-nickel compound phase is HV680-980.

[0245] Table 5 Example 2 mechanical performance characteristics

[0246]

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Abstract

The invention relates to a high-silicon aluminum alloy cylinder sleeve material, which is characterized by comprising the following components by weight percent: 18.0-26.0 percent of Si, 2.0-5.0 percent of Fe, 3.0-7.0 percent of Ni, 1.8-3.0 percent of Cu, 0.5-0.8 percent of Mg, 0.5-0.8 percent of Mn, 0.1-0.3 percent of V and the balance of Al, wherein the amount of Fe and Ni is larger than or equal to 7 percent and less than or equal to 10 percent, and the amount of Fe, Ni and Si is larger than or equal to 27 percent and less than or equal to 33 percent. The high-silicon aluminum alloy cylinder sleeve material and products, which are prepared by the invention, are high in technological property, mechanical property and tribological property; such functions of a hard-spot phase of the cylinder sleeve working face, as bearing, abrasion resistance, oil storage in peripheral concave pits, cooling and lubrication, are prominent to the utmost; and size of particles in the cylinder sleeve and working face tribological shape size are effectively controlled, so that the use effect is better.

Description

technical field [0001] The invention relates to the technical field of metal alloys and their preparation, in particular to a high-silicon aluminum alloy cylinder liner material with good wear resistance and low expansion coefficient and a preparation method thereof. Background technique [0002] Cylinder clearance is an important parameter that determines and affects engine power density, exhaust gas pressure, fuel consumption and environmental emission indicators. Cast iron and steel cylinder liner materials have poor thermophysical compatibility with aluminum alloy piston materials, making it difficult to reduce the cylinder clearance. The high-silicon aluminum alloy cylinder liner material has similar thermophysical properties to the aluminum alloy piston material and aluminum alloy cylinder head, which can significantly reduce the cylinder matching gap and avoid or overcome the disadvantage of poor compatibility. [0003] The tribological mechanism of high-silicon alum...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/03C22C1/06B22D11/06C22F1/043
Inventor 孙廷富章国伟陈耘元涛陈敏翟景郭安振彭银江贺勇陈刚
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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