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Novel bearing zinc alloy

A zinc alloy and bearing technology, which is applied in the field of zinc alloy for bearings, can solve the problems of wide solidification temperature range, low service temperature, and influence on the application of zinc-based alloys, and achieve excellent abnormal temperature mechanical properties, improved performance, excellent die-casting and The effect of aging performance

Active Publication Date: 2015-03-11
苏州利达铸造有限公司
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Problems solved by technology

Although zinc-based alloys also have excellent strength, plasticity, toughness and other mechanical properties, as well as excellent wear resistance and antifriction properties, the proportions of the main alloy components vary greatly, and the alloy solidification temperature range is wide, and the casting process is prone to defects such as porosity and segregation. , seriously affects the application of zinc-based alloys, and its service temperature is also low, often due to the large amount of heat generated by friction and wear under heavy load conditions, the temperature of the parts is overheated and it is difficult to use

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1-4， and comparative example 1-9

[0019] 1) Ingredients: According to the alloy ratio given in Table 1, the alloy ingredients come from pure zinc with a purity of 99.99%, aluminum-silicon alloy with a weight ratio of 1:1, zinc-antimony alloy with a weight ratio of 1:1, Aluminum scandium alloy, electrolytic copper, industrial pure magnesium, pure aluminum and other raw materials with a weight ratio of 1:1.

[0020] 2) Melting: first place pure zinc in a smelting furnace and heat up to 460°C for 10 minutes, then raise the temperature to 830°C and add industrial pure aluminum, aluminum-silicon alloy, aluminum-scandium alloy and electrolytic copper and continue stirring until the aluminum-silicon alloy and electrolytic copper are completely melted, then lower the temperature to 690°C and add zinc-antimony alloy and continue to stir until the zinc-antimony alloy is completely melted, then lower the temperature to 640°C and press industrial pure magnesium to the bottom of the melt for at least 5 minutes, then stir th...

Embodiment 5-7

[0032] In Examples 5-7, and Comparative Examples 10-17, the chemical composition of the alloy is the same as in Example 2, and the optimization of process parameters in the die-casting process is mainly investigated. The selection of parameters and performance results are shown in Table 2.

[0033] Although it is a well-known technology in the art to use two different melt flow rates of low speed and high speed to control defects such as pores in the die-casting process, it can be seen from the results in Table 2 that how to choose the melt flow rate and casting pressure still has a great influence :

[0034] For the melt flow rate and casting pressure of the zinc alloy of the present invention at the low-speed stage, the melt flow rate should be controlled between 0.5-0.8m / s. Too low melt flow rate will cause the melt to cool down too fast and affect the die-casting of the melt performance, which eventually deteriorates the mechanical properties of the alloy, and is also not ...

Embodiment 8-9

[0040] In Examples 8-9, and Comparative Examples 18-21, the chemical composition of the alloy is the same as in Example 2, and the optimization of heat treatment process parameters is mainly investigated. The selection of parameters and performance results are shown in Table 3.

[0041] table 3

[0042]

[0043]

[0044] It can be seen from the results in Table 3 that the homogenization temperature should not be too low, and it needs enough time, otherwise it will be difficult to eliminate stress and improve the mechanical properties; on the contrary, if the temperature is too high, it may cause changes in the structure and seriously affect the mechanical properties. . The aging temperature must also be appropriate. Too low aging temperature and time cannot play a role in obtaining stable mechanical properties, while too high aging temperature will seriously affect the strength of the alloy.

[0045] To sum up, the present invention first rationally designs the compositio...

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Abstract

The invention provides a novel bearing zinc alloy. The zinc alloy comprises the following chemical components by the weight percentage (wt.%): 17-20% of Al, 2.5-4.5% of Cu, 0.05-0.1% of Mg, 1.5-3% of Si, 0.02-0.05% of Sb, 0.05-0.1% of Sc, and the balance being Zn and unavoidable impurities. The zinc alloy has excellent mechanical properties, has strength and hardness especially suitable for use in a heavy load and high temperature environment, and is particularly prepared by the steps: preparing raw materials through the simple alloy elements and the appropriate proportion, then carrying out a proper melting process, followed by carrying out die casting to obtain a casting, and carrying out heat treatment of the casting to obtain the zinc alloy provided by the invention. The alloy composition, smelting, die casting process parameters and heat treatment process parameters are optimally selected, so as to obtain the product having excellent performance.

Description

technical field [0001] The invention relates to the technical field of the application of zinc and its alloys in the machinery industry, and in particular provides a novel zinc alloy applied to wear-resistant parts such as bearings. Background technique [0002] In the field of machinery industry, the sliding bearing alloys mainly use traditional copper-based alloys and babbitt alloy castings, but the raw materials and manufacturing costs of these two alloys are very high, especially with the rapid development of electronic communication and other industrial fields, for copper The demand for copper is increasing day by day. In addition, copper is a scarce resource in my country. As a result, my country needs to import a large amount of copper from abroad every year, which further reduces the space for copper-based alloys to be used as raw materials for bearing components. [0003] In order to replace the traditional copper-based alloys, zinc-based alloy castings are widely us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C18/04C22C1/03B22D17/00C22F1/16
Inventor 季吉清
Owner 苏州利达铸造有限公司
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