Preparation process of self-lubricating ceramic base composite material

Abstract

The invention discloses a preparation process of a self-lubricating ceramic base composite material. The preparation process comprises a microarc oxidation ceramic layer process and an electrophoretic deposition coating process; microarc oxidation electrolyte comprises the following components and concentrations: Na2SiO3 is 4 g / l; Na2WO3 is 4 g / l; KOH is 2 g / l; and EDTA-2Na is 2 g / l; the microarc oxidation comprises the following electric parameters: the forward voltage is 420 v; the negative voltage is 120 v; the power supply frequency is 1500 Hz; and the forward duty ratio is 60%; electrophoretic deposition electrolyte comprises the components of: acrylic acid anode electrophoretic paint with 10% of solid parts, MoS2 nanoparticles with a particle size of 40 nm, and polyethylene glycol; the concentration of the MoS2 nanoparticles is 10 g / l; and the electrophoretic deposition comprises the following electric parameters: the forward voltage is 360 v; the negative voltage is 0 v; the power supply frequency is 20 Hz; and the forward duty ratio is 5%. The preparation process adopts the microarc oxidation ceramic layer process and the electrophoretic deposition coating process in succession, guarantees excellent bonding state of the ceramic base composite material, and prepares the ceramic base composite material with anti-attrition and self-lubricating performances.

Description

technical field [0001] The invention relates to the technical field of surface treatment of aluminum alloys, in particular to a preparation process of a self-lubricating ceramic matrix composite material. Background technique [0002] Ensuring the reliability and durability of cylinder liner-piston assemblies is of paramount importance in the design and manufacture of internal combustion engines. In the cylinder liner-piston assembly, the piston is affected by factors such as thermal stress of high-temperature and high-pressure gas, mechanical erosion, high-temperature corrosion, and friction and wear between the cylinder liner and piston ring, and its reliability is closely related to the life of the engine and operating costs. High-silicon cast aluminum alloys are often used to prepare aluminum alloy pistons. However, high-silicon aluminum alloys have the characteristics of low surface hardness and poor wear and corrosion resistance. Therefore, the surface strengthening ...

AI Technical Summary

Problems solved by technology

However, the bonding methods of composite coatings and substrates obtained by traditional methods such as electrophoretic deposition, electroplating, and spraying are generally epitaxial growth, chemical bonding, molecular bonding, and mechanical bonding. These bonding methods have low bonding strength and are difficult to independently satisfy. Piston high temperature, high pressure, complex stress and harsh working conditions

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