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A kind of heat-resistant cast aluminum-zinc alloy and preparation method thereof

A technology for casting aluminum and zinc alloys, applied in the field of aluminum-zinc alloys, can solve the problems of low working temperature and strength, can not meet the application limitations of special engines and engine soundproof covers, and achieve non-recessive tensile strength and good resistance. Thermal properties, effect of low zinc content

Active Publication Date: 2022-05-17
国家高速列车青岛技术创新中心 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a heat-resistant cast aluminum-zinc alloy and its preparation method, aiming to solve the problem that the casting aluminum-zinc alloy in the prior art has low working temperature and strength, which can not meet the needs of special engine base plate and engine sound insulation cover. The service temperature requirements of other components limit their application

Method used

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  • A kind of heat-resistant cast aluminum-zinc alloy and preparation method thereof
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  • A kind of heat-resistant cast aluminum-zinc alloy and preparation method thereof

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preparation example Construction

[0030] A kind of preparation method of heat-resistant cast aluminum-zinc alloy of the present invention comprises the following steps:

[0031] 1) First, heat the furnace to increase the temperature of the furnace to 200-280°C and keep it warm for 20-35 minutes. Then, put in the raw materials containing Al, Zn, Si, and Cu Continue heating with the raw material containing Ca element to raise the temperature of the furnace to 720-730°C, keep it warm for 1-2h, and stir for 20-30min to obtain an aluminum alloy melt;

[0032] 2) Lower the temperature to lower the furnace temperature to 700-710°C, add raw materials containing Ba element, stir for 10-15 minutes, add refining agent, the amount of refining agent added is 0.4-0.6% of the total weight of the aluminum alloy melt, and stir for 5 -10min;

[0033] 3) Keep the furnace temperature at 700-710°C, add raw materials containing Mg, stir for 3-5 minutes, use inert gas to rotate and spray for 10-15 minutes, let stand for 5-8 minutes...

Embodiment 1

[0042] A kind of preparation method of heat-resistant cast aluminum-zinc alloy of the present invention comprises the following steps:

[0043] 1) Weigh raw materials according to the obtained heat-resistant cast aluminum-zinc alloy containing the following elements in weight percentage, Zn4.5%, Si1.9%, Cu1.8%, Mg0.4%, Ca1.9%, Ba0.3%, impurities less than or Equal to 0.2% and the balance is Al;

[0044] Among them, Al, Zn, Ca and Mg are pure metals, pure metal aluminum is Al99.993, and the element content requirements meet the requirements of GB / T8644-2000; pure metal zinc is Zn99.95, and the element content requirements meet GB / T 470-2008 Requirements; pure metal calcium is Ca99.99, and the element content requirements meet the requirements of GB / T 4864-2008; pure metal magnesium is Mg99.95, and the element content requirements meet the requirements of GB / T 3499-1995; Si adopts AlSi12 master alloy, and the element content requirements It is required to meet the requirements ...

Embodiment 2

[0049] A kind of preparation method of heat-resistant cast aluminum-zinc alloy of the present invention comprises the following steps:

[0050] 1) Weigh raw materials according to the obtained heat-resistant cast aluminum-zinc alloy containing the following elements in weight percentage, Zn5.1%, Si 2.7%, Cu 1.5%, Mg 0.3%, Ca 1.8%, Ba 0.3%, impurities less than or Equal to 0.2% and the balance is Al;

[0051] Among them, Al, Zn, Ca and Mg are pure metals, pure metal aluminum is Al99.993, and the element content requirements meet the requirements of GB / T8644-2000; pure metal zinc is Zn99.95, and the element content requirements meet GB / T 470-2008 Requirements; pure metal calcium is Ca99.99, and the element content requirements meet the requirements of GB / T 4864-2008; pure metal magnesium is Mg99.95, and the element content requirements meet the requirements of GB / T 3499-1995; Si adopts AlSi12 master alloy, and the element content requirements It is required to meet the requirem...

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Abstract

The invention provides a heat-resistant cast aluminum-zinc alloy and a preparation method thereof. The present invention includes the following elements: Zn 4.0‑5.3%, Si 1.5‑2.9%, Cu 1.5‑2.3%, Mg 0.3‑0.6%, Ca 1.5‑2.5%, Ba 0.2‑0.6%, impurity less than or equal to 0.2%, remainder The amount is Al; W Zn / (W Si +W Ca +W Ba )≤1.19; the present invention also provides the preparation method of the above-mentioned alloy, including adding raw materials, smelting, and pouring. The invention forms dense eutectic network Al-Zn-Cu-Ca-Mg-Ba precipitates, effectively strengthens the matrix structure of the alloy, significantly improves the tensile strength of the alloy, and makes the alloy have good heat resistance. The tensile strength can reach 310‑320MPa; the tensile strength does not decline after heat preservation at 220°C for 200 hours, and it can be used for a long time at 220°C.

Description

technical field [0001] The invention relates to the technical field of aluminum-zinc alloys, in particular to a heat-resistant cast aluminum-zinc alloy and a preparation method thereof. Background technique [0002] Aluminum-zinc alloy is a kind of light-weight cast aluminum alloy that can be strengthened without heat treatment. It has good casting performance and is suitable for various casting methods. It is often used to manufacture complex thin-walled aircraft accessories and instrument parts, etc. It has been promoted in the aviation and vehicle fields. application. Compared with traditional cast aluminum alloys, cast aluminum-zinc alloys can reach a certain strength without heat treatment. The working temperature of existing cast aluminum-zinc alloys is low, usually not exceeding 180°C, and the strength of existing cast aluminum-zinc alloys is low; however, in some special industries, such as: special engine base plate and engine sound insulation cover These special ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/02C22C1/03C22C1/06
CPCC22C21/10C22C1/026C22C1/03C22C1/06
Inventor 展旭和王琪童张亚妮宋坤林黄粒杜旭初杨玲丁小明王强宋晓辉
Owner 国家高速列车青岛技术创新中心
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