JP2018090835A - Abrasion resistant surface structure of aluminum alloy and method of producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abrasion resistant surface structure of an aluminum alloy capable of making the surface of an aluminum alloy more abrasion resistant than a conventional one and a method of producing the same.SOLUTION: There is provided an abrasion resistant surface structure 100 of an aluminum alloy comprising an anodic oxidation film 102 formed on the surface of an aluminum alloy 101 to include countless pores 103 with molybdenum disulfide crystal grains 104 precipitated therein, which is characterized in that the aluminum alloy 101 contains silicon, the anodic oxidation film 102 includes countless cracks 105 made to start from primary crystal grains of silicon and eutectic crystal grains of silicon, and molybdenum disulfide crystal grains 104 are precipitated in the countless cracks 105 as in the case of the countless pores 103.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wear-resistant surface structure of an aluminum alloy and a manufacturing method thereof.

  Conventionally, in order to make the piston of an internal combustion engine formed of an aluminum alloy highly durable, primary electrolysis is performed on the surface of the aluminum alloy to form an anodized film, and then secondary electrolysis is performed on the surface of the anodized film. The surface of an aluminum alloy is covered with a wear-resistant layer by depositing molybdenum disulfide crystals in innumerable holes included in the anodized film (see, for example, Patent Documents 1 to 3). .

JP-A 63-170546 JP2012-122445A JP, 2014-077194, A

  However, there is a limit to the conventional structure, and in order to make the piston more durable than before, it is required to make the surface of the aluminum alloy more wear-resistant than before.

  Accordingly, an object of the present invention is to provide a wear-resistant surface structure of an aluminum alloy that can make the surface of the aluminum alloy more wear-resistant than before, and a method for producing the same.

  The present invention relates to a wear-resistant surface structure of an aluminum alloy in which molybdenum disulfide crystals are precipitated in innumerable holes included in an anodized film formed on the surface of the aluminum alloy, wherein the aluminum alloy contains silicon. The anodic oxide film includes innumerable cracks formed from primary silicon particles and eutectic silicon particles, and the innumerable cracks include molybdenum disulfide crystals as in the innumerable holes. A wear-resistant surface structure of an aluminum alloy on which is deposited.

  The aluminum alloy is preferably any one of a eutectic aluminum silicon alloy, a hypereutectic aluminum silicon alloy, or a hypoeutectic aluminum silicon alloy containing phosphorus.

  Furthermore, the present invention provides a primary electrolysis step of forming an anodic oxide film by subjecting the surface of the aluminum alloy to primary electrolysis, and an infinite number of pores contained in the anodic oxide film by subjecting the surface of the anodic oxide film to secondary electrolysis. And a secondary electrolysis step for precipitating molybdenum disulfide crystals on the surface of the aluminum alloy. The primary electrolysis step includes subjecting the surface of the aluminum alloy containing silicon to primary electrolysis. Forming the anodic oxide film including innumerable cracks formed from the innumerable pores, primary silicon particles and eutectic silicon particles, and in the secondary electrolysis step, on the surface of the anodic oxide film Method for producing wear-resistant surface structure of aluminum alloy by subjecting secondary electrolysis to deposit molybdenum disulfide crystal in innumerable holes and innumerable cracks contained in said anodic oxide film To provide.

  The aluminum alloy is preferably any one of a eutectic aluminum silicon alloy, a hypereutectic aluminum silicon alloy, or a hypoeutectic aluminum silicon alloy containing phosphorus.

  INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a wear-resistant surface structure of an aluminum alloy that can make the surface of an aluminum alloy more wear-resistant than before and a method for manufacturing the same.

It is the schematic explaining the wear-resistant surface structure of the aluminum alloy which concerns on embodiment of this invention. It is the schematic explaining the manufacturing method of the abrasion-resistant surface structure of the aluminum alloy which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, the wear resistant surface structure of the aluminum alloy will be described.

  As shown in FIG. 1, the wear-resistant surface structure 100 of an aluminum alloy according to an embodiment of the present invention includes countless holes (the surface of the aluminum alloy 101 Molybdenum disulfide crystal 104 is deposited in (longitudinal fine holes 103) grown substantially vertically.

  The aluminum alloy 101 is any one of a eutectic aluminum silicon alloy containing silicon, a hypereutectic aluminum silicon alloy, or a hypoeutectic aluminum silicon alloy containing phosphorus.

  By adjusting the silicon content, a eutectic aluminum silicon alloy, a hypereutectic aluminum silicon alloy, or a hypoeutectic aluminum silicon alloy can be obtained.

  The silicon content is desirably in the range of, for example, about 10% by mass to 20% by mass.

  The aluminum alloy 101 may contain components other than silicon such as copper, nickel, magnesium, iron, manganese, and / or titanium.

  The anodized film 102 includes innumerable cracks (cracks extending substantially horizontally with the surface of the aluminum alloy 101) 105 formed from the primary crystal particles and the eutectic silicon particles.

  Like innumerable holes 103, molybdenum disulfide crystals 104 are precipitated in innumerable cracks 105.

  The number of the cracks 105 can be increased by increasing the silicon content or increasing the particle diameter of the primary silicon particles and the eutectic silicon particles.

  Next, a method for manufacturing the wear-resistant surface structure of an aluminum alloy will be described.

  As shown in FIG. 2, manufacturing method M100 of an aluminum alloy wear-resistant surface structure according to an embodiment of the present invention forms primary anodization (anodization treatment) on the surface of aluminum alloy 101 to form an anodized film 102. A primary electrolysis step S101, and a secondary electrolysis step S102 in which secondary electrolysis is performed on the surface of the anodized film 102 to deposit molybdenum disulfide crystals 104 in countless holes 103 included in the anodized film 102. .

  In the primary electrolysis step S101, the surface of the aluminum alloy 101 containing silicon is subjected to primary electrolysis and includes innumerable holes 103, and innumerable cracks 105 that are formed starting from primary silicon particles and eutectic silicon particles. An anodized film 102 is formed.

  Since other components other than silicon contained in the aluminum alloy 101 are dissolved in the primary electrolysis step S101, the anodic oxide film 102 containing silicon is formed.

  Originally, even if primary electrolysis is performed on the surface of a hypoeutectic aluminum silicon-based alloy, primary crystal silicon particles cannot be deposited, but countless holes 103 and innumerable grains formed from eutectic silicon particles are the starting points. The anodic oxide film 102 including the crack 105 can be formed.

  However, by adding phosphorus to the hypoeutectic aluminum silicon alloy, the alloy composition can be changed from a eutectic aluminum silicon alloy to a eutectic aluminum silicon alloy or a hypereutectic aluminum silicon alloy. An anodic oxide film 102 including innumerable cracks 105 formed from primary silicon particles and eutectic silicon particles can be formed by generating primary silicon particles as well as crystal silicon particles.

  In the secondary electrolysis step S <b> 102, secondary electrolysis is performed on the surface of the anodic oxide film 102 to deposit molybdenum disulfide crystals 104 in innumerable holes 103 and innumerable cracks 105 included in the anodic oxide film 102.

  By depositing molybdenum disulfide crystal 104 in innumerable holes 103 and innumerable cracks 105, it is possible to impart high self-lubricating properties to the anodized film 102, so that the surface of the aluminum alloy 101 is made more wear resistant than before. To be able to do.

  Therefore, according to the present invention, it is possible to provide an aluminum alloy wear-resistant surface structure 100 and its manufacturing method M100 that can make the surface of the aluminum alloy 101 more wear-resistant than before.

  For example, by applying the present invention to the ring groove, skirt portion, and / or pin boss portion of a piston of an internal combustion engine, the piston can be made to have high strength and low friction, thereby improving durability and improving fuel consumption. Can be realized.

DESCRIPTION OF SYMBOLS 100 Wear-resistant surface structure 101 Aluminum alloy 102 Anodized film 103 Hole 104 Molybdenum disulfide crystal 105 Crack M100 Manufacturing method S101 Primary electrolysis process S102 Secondary electrolysis process

Claims (4)

In the wear-resistant surface structure of an aluminum alloy in which molybdenum disulfide crystals are precipitated in countless holes included in the anodized film formed on the surface of the aluminum alloy,
The aluminum alloy contains silicon,
The anodic oxide film includes innumerable cracks formed starting from primary silicon particles and eutectic silicon particles,
A wear resistant surface structure of an aluminum alloy, characterized in that molybdenum disulfide crystals are precipitated in the infinite number of cracks as in the infinite number of holes. The wear resistance of the aluminum alloy according to claim 1, wherein the aluminum alloy is any one of a eutectic aluminum silicon alloy, a hypereutectic aluminum silicon alloy, or a hypoeutectic aluminum silicon alloy containing phosphorus. Surface structure. A primary electrolysis step of forming an anodized film by subjecting the surface of the aluminum alloy to primary electrolysis;
A secondary electrolysis step of subjecting the surface of the anodized film to secondary electrolysis to deposit molybdenum disulfide crystals in countless holes contained in the anodized film;
In a method for producing a wear-resistant surface structure of an aluminum alloy containing
In the primary electrolysis step, the surface of the aluminum alloy containing silicon is subjected to primary electrolysis, and includes innumerable cracks formed from the innumerable holes, primary silicon particles, and eutectic silicon particles. Forming an anodized film,
In the secondary electrolysis step, the surface of the anodized film is subjected to secondary electrolysis to deposit molybdenum disulfide crystals in the innumerable holes and innumerable cracks included in the anodized film. A method for producing a wear-resistant surface structure of an aluminum alloy. The wear resistance of the aluminum alloy according to claim 3, wherein the aluminum alloy is any one of a eutectic aluminum silicon alloy, a hypereutectic aluminum silicon alloy, or a hypoeutectic aluminum silicon alloy containing phosphorus. Manufacturing method of surface structure.

Images