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A method for improving the dry friction and wear performance of aluminum matrix composites

A technology of aluminum-based composite materials and wear performance, applied in the field of aluminum-based composite materials, can solve problems such as weakened lubrication, subsurface fracture, and weak interface bonding, and achieve the effects of preventing agglomeration, reducing high-temperature oxidation, and improving density

Active Publication Date: 2020-05-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reason for this phenomenon is that when the load is small, the existence of carbon nanotubes plays a good role in lubrication, and as the load increases, the problem of weak interfacial bonding caused by the poor wettability of carbon nanotubes and aluminum substrates makes The carbon nanotubes debond rapidly from the aluminum alloy, resulting in reduced lubrication and the composite exhibits extensive subsurface fracture and spalling

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  • A method for improving the dry friction and wear performance of aluminum matrix composites
  • A method for improving the dry friction and wear performance of aluminum matrix composites
  • A method for improving the dry friction and wear performance of aluminum matrix composites

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specific Embodiment approach 1

[0035] Embodiment 1: The method for improving the dry friction and wear performance of aluminum-based composite materials in this embodiment is completed according to the following steps:

[0036] Step 1. Take the required mass of carbon nanotubes and silicon carbide whiskers respectively according to the designed volume fraction, and the calculation formula is where V pre is the designed prefabricated block volume, is the volume fraction of the designed carbon nanotubes or silicon carbide whiskers, ρ is the density of the designed carbon nanotubes or silicon carbide whiskers, where V pre The unit is cm 3 , the unit of ρ is g / cm 3 , the density of carbon nanotubes is 1.3g / cm 3 , the density of silicon carbide whiskers is 3.2g / cm 3 , the unit of m is g;

[0037]The design prefabricated block size is φ50mm×25mm, V pre =49cm 3 , the volume fraction ratio of carbon nanotubes to silicon carbide whiskers is 1:1 and the overall volume fraction is 20vol.%, then is 10vol.%,...

specific Embodiment approach 2

[0046] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 7, high temperature heat exposure superimposes peak aging treatment. The heat treatment process is 580°C / 1.5h, 160°C / 5h, and the cooling rate between the two temperatures is 4°C / min, and finally cooled down to room temperature with the furnace.

[0047] The scanning electron microscope (SEM) topography photo of carbon nanotubes after electroless nickel plating in the present embodiment is as follows figure 1 shown. From figure 1 It can be seen that a uniform nickel metal layer is attached to the surface of the carbon nanotubes, and a small amount of nickel particles can be seen between the carbon nanotubes.

[0048] Utilize the silicon carbide whisker scanning electron microscope (SEM) topography photograph after pretreatment of the method of this embodiment as follows figure 2 As shown, the whisker dispersibility is good and there are few impurities.

[0049] Th...

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Abstract

The invention discloses a method for improving the dry friction and wear performance of aluminum-based composite materials, which belongs to the technical field of aluminum-based composite materials. The invention aims at the technical difficulties that the carbon nanotubes are difficult to uniformly disperse in the aluminum matrix and the interface bonding between the carbon nanotubes and the aluminum matrix is ​​weak. The method of the present invention: one, utilizing the quality of carbon nanotube and silicon carbide whisker by weighing; Two, carbon nanotube surface nickel plating is placed in dehydrated alcohol, ultrasonic dispersion, suspension liquid A; Three, silicon carbide whisker acid After washing, put it into distilled water, ultrasonically disperse, and make suspension B; 4. Drop suspension A into suspension B, pour in binder, and press the prefabricated block; 5. Put it into a extrusion casting mold, heat Insulation, casting molten aluminum alloy, sealing, two-stage pressurization, pressure-holding and cooling, and retreating the mold; Sixth, hot extrusion; Seventh, heat treatment. The invention improves the dry friction and wear performance of the aluminum-based composite material.

Description

technical field [0001] The invention belongs to the technical field of aluminum-based composite materials; in particular, it relates to a method for improving the dry friction and wear performance of aluminum-based composite materials. Background technique [0002] With the rapid development of industries such as aerospace, rail transportation and automobile industry, the demand for lightweight, high-strength and wear-resistant multifunctional materials is becoming more and more obvious. SiC whisker-reinforced aluminum matrix composites have been widely studied and applied due to their good wear resistance, low density, high thermal conductivity, and low expansion coefficient. However, with the increasing wear resistance of materials, aluminum matrix composites reinforced with a single silicon carbide whisker can no longer meet the requirements. wear resistance. [0003] Since the discovery of carbon nanotubes in 1991, carbon nanotubes have attracted widespread attention d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/02C22C21/00B22D17/00
CPCC22C1/101C22C1/1036C22C21/00B22D17/00C22C1/1073
Inventor 张学习钱明芳耿林
Owner HARBIN INST OF TECH
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