CN85102457B

CN85102457B - Eutectic silicon, copper, magnesium, nickel and tellurium series aluminium alloys for piston casting

Info

Publication number: CN85102457B
Application number: CN85102457A
Authority: CN
Inventors: 黄积荣; 曹文龙; 姜淑艳; 杜艳玲
Original assignee: SHAANXI MACHINERY COLLEGE
Current assignee: SHAANXI MACHINERY COLLEGE
Priority date: 1985-04-01
Filing date: 1985-04-01
Publication date: 1987-05-06
Also published as: CN85102457A

Abstract

The present invention relates to piston aluminium alloy which is successfully developed by a tellurium microalloy or a tellurium and antimony compound microalloy technical measure on the basis of alloy ZL109. Compared with the ZL109, the alloy of the present invention has the obvious characteristic of casting property improvement so that a linear expansion coefficient is greatly reduced and achieves the level of hypereutectic Al-Si piston alloy. Mechanical property at room temperature and high temperature is enhanced, and abrasion resistance is enhanced.

Description

Eutectic aluminum copper silicon magnesium, nickel and tellurium series aluminium alloys for piston

The invention belongs to cast aluminium alloy material.

At present, vehicle piston extensively adopts the eutectic aluminum Si system alloy that contains Cu, Mg, Ni.The Si amount is 8～13%, and this is the low-expansion coefficient aluminium alloy.So because it is better to contain the thermotolerance of Ni alloy, especially more than 200 ℃, the alloy property that contains Ni is more superior than the alloy property that does not contain Ni.So, on high-power diesel oil and gasoline car, basically adopt this type of alloy.For piston, be in for a long time under 300～350 ℃ the temperature and work, so the linear expansivity of reduce piston, improving its high-temperature mechanical property and wear resistance is engineering technical personnel's three big problems.The method that reduces at present the piston linear expansivity has two: adopting hypereutectic Al-Si is piston alloy or employing cast-iron piston.But these two kinds of methods make piston machine processing or casting technique become very difficult.For cast-iron piston, for weight reduction must reduce wall thickness as far as possible, this is very difficult thing to the kart piston.In order to improve the high-temperature mechanical property of piston alloy, the present invention has adopted and has added tellurium or add tellurium and the method for antimony microalloying or combined microalloying, thereby has reached raising room temperature and high-temperature mechanical property, reduces triple effects of the coefficient of expansion and raising wear resistance.This method is simple and easy to do, and is effective.

The Al-Si-Cu-Mg-Ni that uses at present is piston alloy, and there is ZL109(Si11～13% in China, Cu0.5～1.5%, Mg0.7～1.3%, Ni0.5～1.5%, Mn0.2～0.7%, all the other are Al), there is AC8A(Si11～13% in Japan, Cu0.8～1.3%, Mg0.7～1.3%, Ni1.0～2.5%, Ti is below 0.2%, all the other are Al), there is SAE321 in the U.S., and there is Nural3210 in West Germany, there is A-912UN in France, and the content of its Si-Cu-Mg-Ni is the same basically.

Main points of the present invention are on the basis of ZL109, also contain Te0.001～0.200% or Te0.001～0.200% and Sb0.1～0.2%, can use the starting material identical with ZL109 and melting equipment formulated.The scope of its chemical ingredients can be controlled in:

ZLAlSi12CuMgNi2Te:Si11～13%, Cu0.5～1.5%, Mg0.8～1.5%, Ni1.0～2.5%, Te0.001～0.200%, it is Mn＜0.6% that impurity element allows content range, Fe＜0.5%, Zn＜0.2%, Sn＜0.1%, Pb＜0.05%, all the other are other impurity and Al.

ZLAlSi12CuMgNi2TeSb:Si11～13%, Cu0.5～1.5%, Mg0.8～1.5%, Ni1.0～2.5%, Te0.001～0.200%, Sb0.1～0.2%, it is Mn＜0.6% that impurity element allows content range, Fe＜0.5%, Zn＜0.2%, Sn＜0.1%, Pb＜0.05%, all the other are other impurity and Al.

Alloy of the present invention is owing to be tellurium or tellurium and the antimony that also contains trace in the ZL 109 piston alloy, so after casting and thermal treatment, take a sample from piston body, carry out various performance tests, the result shows: linear expansivity has reduced, and reaching hypereutectic Al-Si is the level of piston alloy; Room temperature and high-temperature mechanical property significantly improve.The linear expansivity of alloy of the present invention is in 20～200 ℃ scope and ZL109, and AC8A, Ar25 compare and descend 2 * 10 ^-6The right side, in addition more much lower than hypereutectic Al-Si piston alloy Mahlel38.At 20～300 ℃ of scope internal ratio ZL109, AC8A, Ar25 is little by 1 * 10 ^-6/ ℃, reached the level of Mahle138 piston alloy.The room temperature strength of alloy of the present invention is higher by 20～70% than AC8A and Mahle, and hot strength also improves a lot than these two kinds of alloys.

Alloy of the present invention also possesses such Some features: castability is superior, air-breathing tendency is little in the fusion process, the pinhole rate rank is approximately than low about 2 grades of ZL 109 alloy, aluminium alloy is through after adding Te, oxidation is very light in long-time casting process, and insulation 8 hours or three alloy properties of remelting are constant under smelting temperature; The material wear resistance is good; Machinability is than the further improvement of ZL 109 alloy, and Piston Machining rear surface smooth finish is than ZL 109 alloy height

About 2.

Alloy of the present invention is applicable to makes high speed high-power diesel oil, gasoline engine piston.

Claims

1, the casting for piston aluminium alloy is characterized in that, it contains Si11～13%, Cu0.5～1.5%, Mg0.8～1.5%, Ni1.0～2.5% adds and Te0.001～0.200% or Te0.001～0.200% and Sb0.1～0.2%, Mn＜0.6%, Fe＜0.5%, Zn＜0.2%, Sn＜0.1%, Pb＜0.05%, all the other are other impurity and Al.