Semi-solid preparation process for SiCp/ZL104 bearing bushes

A composite bearing bush and preparation technology, which is applied in the field of casting and pressure processing, can solve the problems of high cost, low welding strength, poor wear resistance of aluminum-based alloys, etc., and achieve the effect of low cost, high cost and simple process

Inactive Publication Date: 2014-08-13
XI AN JIAOTONG UNIV
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Problems solved by technology

This method can well make up for the shortcomings of insufficient strength and hardness of aluminum-based alloys, but there are still poor wear resistance of aluminum-based alloys, the interface bonding strength of composite plates is not easy to control, the welding strength of steel plates after welding into cylinders is not high, and the follow-up machine Disadvantages such as difficult processing, complex manufacturing process of the entire bearing bush, and high cost

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  • Semi-solid preparation process for SiCp/ZL104 bearing bushes

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] Referring to the accompanying drawings, a semi-solid preparation process of SiCp / ZL104 composite bearing comprises the following steps:

[0020] 1) Perform high-temperature pre-oxidation treatment on SiC particles. The process is to calcinate SiC particles with a size of 50-100um at a high temperature of 900-1100°C for 3 hours, and then perform heat preservation treatment in the range of 250-300°C;

[0021] 2) After grinding the ZL104 ingot to remove the oxide layer, put it into an intermediate frequency induction furnace and turn on the protective gas, heat the ZL104 ingot to above the liquidus line of 595°C to completely melt it, and after the thermocouple detects that the temperature is stable, gradually Adjust the power of the intermediate frequency induction furnace to stabilize the temperature in the furnace at 615-625°C and keep it warm for 10-15 minute...

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Abstract

Disclosed is a semi-solid preparation process for SiCp / ZL104 bearing bushes. The semi-solid preparation process comprises fully stirring pretreated SiC particles and a prepared ZL104 solution to prepare a semi-solid sizing agent and pouring the sizing agent to a die to be subjected to extrusion forming into ideal SiCp / ZL104 bearing bushes. The process is reasonable in design, safe and reliable in performance and capable of preparing SiCp / ZL104 bearing bushes with outstanding comprehensive performances. The bearing bushes are low in cost, environmentally friendly and high in performance and can replace or partially replace steel backing dual-metal composite bearing bushes made of A120 SnCu materials or copper-lead alloy.

Description

technical field [0001] The invention belongs to the technical field of casting and pressure processing, and in particular relates to a semi-solid preparation process of SiCp / ZL104 composite bearing bush. Background technique [0002] Semi-solid processing is a metal forming method proposed by Professor Flemings of the Massachusetts Institute of Technology in the 1970s. The so-called semi-solid processing is to heat the metal to the temperature between the solidus line and the liquidus line, and keep it warm for a certain period of time to obtain spherical or nearly spherical grains, and then die-cast, extrude or die-forge them. It is a forming method between casting (pure liquid state) and forging (pure solid state). Spherical or nearly spherical semi-solid slurry has the advantages of good fluidity, low forming force and good performance of formed parts, so this process has received more and more attention. [0003] With the comprehensive and rapid development of my count...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/02
Inventor 赵升吨王永飞张晨阳赵永强韩晓兰
Owner XI AN JIAOTONG UNIV
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