Process method for improving friction and wear properties of multi-element aluminum-silicon alloy
An aluminum-silicon alloy, friction and wear technology, applied in the field of improving the friction and wear performance of multi-element aluminum-silicon alloy
Inactive Publication Date: 2015-02-04
JIANGSU UNIV
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Problems solved by technology
The tribological behavior of these friction pairs will not only affect the working performance and operating efficiency of the engine, but also affect the service life of the engine block and other components
Method used
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Embodiment 1
[0019]The material is cast aluminum-silicon alloy, and the raw materials are commercially available. The specific chemical composition (mass percentage) is: Si 7-8%, Cu 3-4%, Mg 0.3-0.4%, Mn 0.2-0.3%, Zn 0.4-0.5 %, Fe≤0.35%, the rest is Al. Electromagnetic induction graphite crucible aluminum melting furnace is used for melting. In addition to Mg and Zn, other raw materials are added to the graphite crucible, and after all the raw materials are melted at 770 ° C, the temperature is lowered to 740 ° C and Mg and Zn are added. After melting, add a compound refinement modifier (chemical composition is calculated by mass percentage, specifically: Ti is 12%, Cr is 8%, Ni is 10%, Sr is 9%, Ce is 6%, La is 6% , Nb is 6%, Pr is 4%, Er is 4%, Eu is 4%, Y is 3%, Ba is 3%, B is 3%, Na is 2%, V is 2%, and the rest is Al) , the addition amount is 0.50% of the total mass of the alloy liquid. Subsequently, a commercially available HGJ-2 aluminum alloy sodium-free refining slag and degasse...
Embodiment 2
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The invention discloses a process method for improving friction and wear properties of a multi-element aluminum-silicon alloy, belonging to the technical field of aluminum-silicon alloys. The process method comprises the following steps: by taking a cast aluminum-silicon alloy as a material, putting a metal casting mould on a vibrating table during casting, wherein the frequency of a vibrating device is 50Hz, and the vibrating amplitude of the vibrating device is 5-20mm; casting while vibrating, and closing the vibrating table after the casting is completed; and finally, performing the following two treatments: (a)T6 treatment, namely, firstly performing solid-solution treatment, immediately performing water cooling after preserving the heat for 5 hours at 485+ / -5 DEG C, then, performing time ageing treatment, immediately performing water cooling after preserving the heat for 5 hours at 160+ / -5 DEG C to obtain a T6-state alloy; and (b) casting quenching ageing treatment, namely directly quenching the cast mould into room-temperature water until reaching the room temperature after completing the casting and waiting for 3 minutes, then, performing ageing treatment, preserving the heat for 6 hours at 185+ / -5 DEG C, and then, immediately performing water cooling to obtain the casting and quenching ageing state alloy. The cast aluminum-silicon alloy in two states is sampled by adopting a linear cutting method to perform an oil lubrication-boundary friction-sliding friction wear test, wherein the rotation speed of the friction pair is 200r / min. The wear resistance of the alloy in two states is greatly improved.
Description
technical field [0001] The invention belongs to the technical field of aluminum-silicon alloy preparation, in particular to a process method for improving the friction and wear performance of multi-element aluminum-silicon alloy. Background technique [0002] According to statistics, about 1 / 3 to 1 / 2 of the world's energy consumption is in various forms of friction, and about 80% of component failures are caused by various forms of wear. Take the automobile engine as an example: the engine itself is a highly integrated, multi-system, high-speed mechanical device, and there are various types of friction parts inside it, and its friction loss energy accounts for about 20% of the total engine power. As the most important part of the engine, the automobile engine block has heavy castings, complex structures, and uneven wall thickness distribution. It also withstands high temperatures, high pressures, poor lubrication conditions, solid particles, and even corrosive media. Fri...
Claims
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IPC IPC(8): C22C21/04C22C1/02C22F1/043
CPCC22C1/026C22C21/04C22F1/043
Inventor 刘光磊司乃潮万浩王宏健丁冉王正军
Owner JIANGSU UNIV