A laminated aluminum-based composite plate for power connection fittings and a preparation method thereof

Abstract

The application discloses a laminated aluminum-based composite plate for electric power connection hardware and a preparation method thereof, the hardware is a plate-shaped hardware, the composite plate comprises a ceramic layer and a bonding layer and an aluminum alloy layer which are symmetrically arranged outside the ceramic layer; the thicknesses of the ceramic layer, the bonding layer and the aluminum alloy layer are respectively 0.1mm-0.5mm, 0.1mm-0.5mm and 0.5mm-2mm; the laminated aluminum-based composite plate provided by the application has excellent corrosion resistance and wear resistance, and does not need to mix alloy powder and ceramic powder, so that the preparation process is greatly simplified.

Description

Technical Field

[0001] The invention relates to an aluminum-based composite plate, in particular to a laminated aluminum-based composite plate for electric power connection fittings and a preparation method thereof. Background Art

[0002] With the development of UHV engineering construction and the increasing demand for power transmission and transformation engineering components, the application of high-performance new materials in various components has also received widespread attention. In the field of power connection fittings, the materials currently used are mostly steel materials such as structural steel and cast iron. However, these materials have disadvantages such as heavy weight, poor wear resistance and corrosion resistance, and require additional surface treatment to increase their corrosion resistance and wear resistance. In addition, due to the large weight of steel materials, the hardware prepared from them not only increases the difficulty of manufacturing, transportation and construction, but also the service life of the hardware is not optimistic. Therefore, lightweighting is the future development trend of overhead transmission line connection fittings. The use of lightweight materials to manufacture large-tonnage connection fittings and form a unified connection size series can reduce the weight of the fittings, save material usage, and facilitate transportation, construction and operation and maintenance, ultimately saving engineering construction investment and reducing the technical difficulty of engineering construction.

[0003] Aluminum alloys and composite materials based on aluminum alloys are commonly used lightweight materials in the field of engineering materials. Aluminum-based composite materials can improve the overall corrosion resistance and wear resistance of the material by adding alloying elements and reinforcing phases. However, the molding process of composite materials in the existing technology is more complicated and costly than that of casting alloys. Summary of the Invention

[0004] To overcome the shortcomings of the existing technology, the present invention discloses a laminated aluminum-based composite plate for power connection hardware with simple process and excellent corrosion resistance and wear resistance, and its preparation method. The present invention is achieved by adopting the following technical solutions:

[0005] A laminated aluminum-based composite plate for an electric power connection fitting, wherein the fitting is a plate-shaped fitting and comprises a ceramic layer and an adhesive layer and an aluminum alloy layer symmetrically arranged outside the ceramic layer;

[0006] The thicknesses of the ceramic layer, the bonding layer and the aluminum alloy layer are 0.1 mm to 0.5 mm, 0.1 mm to 0.5 mm and 0.5 mm to 2 mm respectively.

[0007] Furthermore, the bonding layer comprises 5% to 25% Zn and 75% to 95% Mg by mass.

[0008] The method for preparing the laminated aluminum-based composite plate for power connection fittings described in any one of the above items comprises:

[0009] 1) placing aluminum alloy, bonding material, ceramic material, bonding material, and aluminum alloy into a mold in sequence to form corresponding layers;

[0010] 2) hot pressing the layer material to obtain a preform;

[0011] 3) hot forging the preform to obtain the aluminum-based composite plate.

[0012] Furthermore, the preparation method of the ceramic material includes:

[0013] a) pretreating the ceramic powder;

[0014] b) grinding the obtained ceramic powder;

[0015] c) laser sintering the ground ceramic powder to obtain the ceramic material.

[0016] Furthermore, the pretreatment includes stirring the ceramic powder, surfactant and water in a reactor for 3-5 hours;

[0017] The surfactant includes polyvinyl alcohol or hydroxyethyl cellulose.

[0018] Furthermore, the grinding includes grinding at 250 rpm for 40 to 60 min.

[0019] Furthermore, the laser power of the laser sintering is 30-50W, the scanning speed is 1500mm / s, the scanning interval is 0.1-0.15mm, the preheating temperature is 50°C, and the processing temperature is 140-150°C.

[0020] Furthermore, the hot pressing treatment includes: holding the layer material at 400-550° C. and 50-150 MPa for 1-5 hours and then hot pressing at a vacuum degree of 0.1-0.01 Pa.

[0021] Furthermore, the hot forging treatment includes: keeping the preform at 350-550°C for 1-6 hours and then forging it at 300-500°C.

[0022] Compared with the closest existing technology, the technical solution provided by the present invention has the following excellent effects:

[0023] 1) The technical solution provided by the present invention has a simple process. By combining low-cost hot pressing and hot forging processes, the density and interface bonding strength of the laminated structure are effectively improved. In addition, there is no need to mix alloy powder and ceramic powder during the process, which greatly simplifies the preparation process of aluminum-based composite materials, reduces process costs, and is suitable for engineering application promotion.

[0024] 2) The technical solution provided by the present invention consists of a symmetrical aluminum base layer, a bonding layer and a ceramic layer, and introduces Mg and Zn elements with low melting point characteristics. Mg, Zn elements and Al form a reinforcing phase, effectively bonding the ceramic layer and the aluminum base layer, and greatly improving the mechanical properties of the aluminum-based composite plate.

[0025] 3) The outer layer of the plate of the technical solution provided by the present invention is an aluminum alloy with good corrosion resistance, which meets the corrosion resistance performance index of the connecting hardware. The longitudinal cross-section structure is a laminated structure containing a ceramic particle layer, which meets the wear resistance performance requirements of the connecting hardware. The plate has good transverse density, and the hardware can withstand a tensile load of more than 400MPa, the yield strength is not less than 318MPa, and the corrosion rate is less than 2.00g / m 2 d. Meet the mechanical performance requirements of power connection hardware plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the laminated aluminum-based composite plate provided by the present invention. DETAILED DESCRIPTION

[0027] In order to better understand the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0028] Commonly used materials for power connection hardware are steel materials, which are heavy and have high transportation, construction and maintenance costs, and the corrosion resistance and friction resistance of the materials are poor. The existing technology applies aluminum alloys with lower specific gravity to the field of hardware to achieve the purpose of lightweighting, and adds alloy elements and reinforcing phases to form aluminum-based composite materials to improve the overall corrosion resistance and wear resistance of the material. However, traditional aluminum-based composite material forming and densification processes have disadvantages such as long process routes and high production costs. In order to make the power connection hardware materials have high density, excellent corrosion resistance and friction resistance while ensuring formability, the present invention proposes a laminated composite material plate and its preparation process, the laminated composite material plate such as Figure 1 shown.

[0029] Example 1

[0030] The preparation method provided in this embodiment includes:

[0031] 1) Silicon carbide powder, hydroxyethyl cellulose, and water were stirred in a reactor for 5 h, then ground at 250 rpm for 40 min, and finally laser sintered with a laser power of 30 W, a scanning speed of 1500 mm / s, a scanning pitch of 0.1 mm, a preheating temperature of 50°C, and a processing temperature of 140°C.

[0032] 2) 2XXX aluminum alloy powder, Mg-10% Zn powder, silicon carbide powder, Mg-10% Zn powder, and 2XXX aluminum alloy powder are sequentially loaded into a hot pressing mold from bottom to top, and stacked in this order until the thickness reaches 40 mm, with the top layer being 2XXX aluminum alloy powder. The thickness of the 2XXX aluminum alloy layer is 0.5 mm, the thickness of the Mg-10% Zn layer is 0.1 mm, and the thickness of the silicon carbide particle layer is 0.1 mm.

[0033] 3) The layer material obtained in 1) was maintained at 550° C. and 150 MPa for 1 hour and then hot pressed at 0.01 Pa. The preform plate obtained after hot pressing had a thickness of 28 mm.

[0034] 4) The preform was kept at 550° C. for 1 hour and then forged at 500° C. The thickness of the laminated aluminum-based composite material plate obtained by forging was 20 mm.

[0035] Example 2

[0036] The preparation method provided in this embodiment includes:

[0037] 1) Silicon carbide powder, polyvinyl alcohol, and water were stirred in a reactor for 4 h, then ground at 250 rpm for 50 min, and finally laser sintered with a laser power of 40 W, a scanning speed of 1500 mm / s, a scanning pitch of 0.12 mm, a preheating temperature of 50°C, and a processing temperature of 145°C.

[0038] 2) 2XXX aluminum alloy powder, Mg-20% Zn powder, silicon carbide powder, Mg-20% Zn powder, and 2XXX aluminum alloy powder are sequentially loaded into a hot pressing mold from bottom to top, and stacked in this order until the thickness reaches 60 mm, with the top layer being 2XXX aluminum alloy powder. The thickness of the 2XXX aluminum alloy layer is 1 mm, the thickness of the Mg-10% Zn layer is 0.3 mm, and the thickness of the silicon carbide particle layer is 0.4 mm.

[0039] 3) The layer material obtained in 1) was pressurized at 420° C. and 100 MPa for 3 hours, and then hot-pressed at 0.05 Pa. The preform sheet obtained after hot pressing had a thickness of 40 mm.

[0040] 4) The preform was kept at 450° C. for 4 hours and then forged at 420° C. The thickness of the laminated aluminum-based composite material plate obtained by forging was 35 mm.

[0041] Example 3

[0042] The preparation method provided in this embodiment includes:

[0043] 1) Aluminum nitride powder, polyvinyl alcohol, and water were stirred in a reactor for 3 h, then ground at 250 rpm for 60 min, and finally laser sintered with a laser power of 50 W, a scanning speed of 1500 mm / s, a scanning pitch of 0.15 mm, a preheating temperature of 50°C, and a processing temperature of 150°C.

[0044] 2) 6XXX aluminum alloy powder, Mg-15% Zn powder, aluminum nitride powder, Mg-15% Zn powder, and 6XXX aluminum alloy powder were sequentially loaded into a hot pressing mold from bottom to top, and stacked in this order until the thickness reached 43 mm, with the top layer being 6XXX aluminum alloy powder. The 6XXX aluminum alloy layer had a thickness of 2 mm, the Mg-15% Zn layer had a thickness of 0.5 mm, and the aluminum nitride particle layer had a thickness of 0.5 mm.

[0045] 3) The layer material obtained in 1) was pressurized at 400° C. and 50 MPa for 5 h, and then hot-pressed at 0.1 Pa. The preform sheet obtained after hot pressing had a thickness of 35 mm.

[0046] 4) The preform was kept at 350° C. for 6 hours and then forged at 300° C. The thickness of the laminated aluminum-based composite material plate obtained by forging was 25 mm.

[0047] Table 1. Performance parameters of Examples 1-3

[0048]

[0049] As shown in Table 1, the tensile strength of the present invention is as high as 462MPa, the yield strength is as high as 337MPa, and the corrosion rate is only 2.00g / m 2 d. Excellent mechanical properties and corrosion resistance.

[0050] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A method for preparing a laminated aluminum-based composite plate for power connection hardware, wherein the hardware is a plate-shaped hardware, characterized in that: The composite plate comprises a ceramic layer and a bonding layer and an aluminum alloy layer symmetrically arranged outside the ceramic layer; The thicknesses of the ceramic layer, bonding layer and aluminum alloy layer are 0.1mm-0.5mm, 0.1mm-0.5mm and 0.5mm-2mm respectively; The bonding layer comprises Zn 5% to 25% and Mg 75% to 95% by mass; The preparation method comprises: 1) Put aluminum alloy powder, bonding powder, ceramic powder, bonding powder and aluminum alloy powder into the mold in sequence to form corresponding layers; 2) hot pressing the layer material to obtain a preform; 3) hot forging the preform to obtain the aluminum-based composite plate; The preparation method of the ceramic powder comprises: a) Pretreatment of ceramic powder; b) grinding the obtained ceramic powder; c) laser sintering the ground ceramic powder to obtain the ceramic powder; The laser sintering has a laser power of 30-50W, a scanning speed of 1500mm / s, a scanning pitch of 0.1-0.15mm, a preheating temperature of 50°C, and a processing temperature of 140-150°C; The hot pressing treatment comprises: holding the layer material at 400-550°C and 50-150 MPa for 1-5 hours and then hot pressing at a vacuum degree of 0.01-0.1 Pa; The hot forging treatment includes: keeping the preform at 350-550° C. for 1-6 hours and then forging at 300-500° C.

2. The method for preparing the laminated aluminum-based composite plate for power connection fittings according to claim 1, wherein: The pretreatment comprises stirring the ceramic powder, surfactant and water in a reactor for 3-5 hours; The surfactant includes polyvinyl alcohol or hydroxyethyl cellulose.

3. The method for preparing the laminated aluminum-based composite plate for power connection fittings according to claim 1, wherein: The grinding comprises grinding at 250 rpm for 40 to 60 min.

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