Novel Ag-C fiber brush contact and preparation method thereof

Abstract

The invention discloses a novel Ag-C fiber electric brush contact which comprises Ag fibers and C fibers, according to the total volume of the novel Ag-C fiber electric brush contact, the Ag fibers account for 20%-30% of the total volume of the novel Ag-C fiber electric brush contact, and the C fibers account for 5%-10% of the total volume of the novel Ag-C fiber electric brush contact; during preparation, the Ag fibers and the C fibers are cut into the same length and then are stacked and laid on the Cu net, the Cu net is used for wrapping the Ag fibers and the C fibers, the wires are welded, then the resin is used for filling and fixing the end face and coating the surface of the Cu net, and after the resin is hardened, the Ag-C fiber electric brush with the Ag fibers evenly separated by the C fibers is obtained. Through tests, the novel Ag-C fiber electric brush provided by the invention has the characteristics of stable friction coefficient (in a stable stage of a wear distance exceeding 100km), low noise, low wear rate (superior to 10 <-15 > m < 3 > / Nm) and the like.

Description

Technical Field

[0001] The invention relates to the technical field of sliding electric contact, in particular to a novel Ag-C fiber brush contact and a preparation method thereof. Background Art

[0002] Conductive slip rings in offshore oil and gas production platforms are responsible for the transmission of power and communication signals. Conductive slip rings require their electrical contact materials to have stable current-carrying friction and wear properties and good mechanical, electrical and thermal conductivity. Silver-carbon composite materials have stable friction and wear properties, strong corrosion resistance and excellent thermal conductivity, and are widely used in electrical contact materials.

[0003] At present, the research on brushes in China is focused on carbon brushes and silver-based solid lubricant brush materials, such as carbon fiber-graphite reinforced brushes and silver-copper-molybdenum disulfide solid lubricant brush materials. There are very few studies on fiber brushes, and some of them are based on carbon as the matrix and copper fiber as reinforcement instead of bundled fiber brushes. The development is relatively slow and the application is relatively small.

[0004] There are many studies on fiber brushes abroad. The U.S. Navy, together with the University of Virginia, HiPerCon, LLC (a small company in Virginia) and DHi (Defense Holdings, Inc.), developed related metal fiber brushes with the aim of reducing the maintenance and replacement of brushes in nuclear submarines and realizing their application in conductive slip rings for surface ships, electric propulsion and floating platforms.

[0005] Therefore, for the application in conductive slip rings of equipment such as surface ships, electric propulsion and floating platforms, a new type of brush contact needs to be developed to meet the engineering requirements of friction resistance (better than 10-15m3 / Nm) and ultra-long distance friction (stable stage of wear distance exceeding 100km). Summary of the invention

[0006] The purpose of the present invention is to provide a novel Ag-C fiber brush contact and a preparation method thereof, so as to solve the technical problems raised in the above background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a new Ag-C fiber brush contact, comprising Ag fibers and C fibers. According to the total volume of the new Ag-C fiber brush contact, the Ag fibers account for 20%-30% of the total volume of the new Ag-C fiber brush contact, and the C fibers account for 5%-10% of the total volume of the new Ag-C fiber brush contact.

[0008] Preferably, in the novel Ag-C fiber brush contact, the lengths of the Ag fiber and the C fiber are both 20-30 mm, and the Ag fiber and the C fiber are wrapped with a Cu mesh to form a mixture.

[0009] Preferably, the wear rate of the novel Ag-C fiber brush contact is better than 10 -15 m 3 / Nm, the stable wear distance reaches 100km.

[0010] The present invention also provides a method for preparing a novel Ag-C fiber brush contact, comprising the following steps:

[0011] Step 1: According to the total volume of the novel Ag-C fiber brush contact, Ag fibers accounting for 20%-30% of the total volume of the novel Ag-C fiber brush contact and C fibers accounting for 5%-10% of the total volume of the novel Ag-C fiber brush contact are respectively taken;

[0012] Step 2: Cut the Ag fibers into the same length and arrange them in a directional manner, cut the carbon fibers into the same length and arrange them in a dispersed directional manner, take a portion of the Ag fibers and lay them on the Cu mesh, then lay a layer of the dispersed C fibers on the Ag fibers, and stack and lay them layer by layer for use;

[0013] Step 3: Use the Cu mesh to wrap and fix the Ag fiber and the C fiber to form a mixture, and place it vertically, and then weld a wire at one end of the Cu mesh for conductive test lead wire;

[0014] Step 4: Use resin to fill and fix the Ag fiber, the C fiber, and one end face of the Cu mesh and coat the surface of the Cu mesh. After the resin is hardened, the novel Ag-C fiber brush contact in which the C fiber evenly separates the Ag fiber can be obtained.

[0015] Preferably, in step 2, the lengths of the Ag fibers and the C fibers after cutting are both 20-30 mm.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The novel Ag-C fiber brush contact provided by the present invention has good electrical conductivity and friction performance, wherein the Ag fiber accounts for 20%-30% of the total volume of the novel Ag-C fiber brush contact, and the C fiber accounts for 5%-10% of the total volume of the novel Ag-C fiber brush contact;

[0018] 2. The new Ag-C fiber brush contact provided by the present invention has the characteristics of stable friction coefficient, low noise and low wear rate, and the wear rate is better than 10 -15 m3 / Nm, the stable stage of ultra-long distance friction with a wear distance exceeding 100km. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a novel Ag-C fiber brush contact provided by the present invention;

[0020] Figure 2 A process map for preparing the novel Ag-C fiber brush contact provided by the present invention;

[0021] Figure 3 A schematic diagram of the structure of a novel Ag-C fiber brush contact provided in Comparative Example 1 of the present invention;

[0022] Figure 4 A schematic diagram of the structure of a novel Ag-C fiber brush contact provided in Comparative Example 2 of the present invention;

[0023] Figure 5 A schematic diagram of the structure of a novel Ag-C fiber brush contact provided in Example 1 of the present invention;

[0024] Figure 6 This is a schematic structural diagram of the novel Ag-C fiber brush contact provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-2 The present invention provides a technical solution: a new Ag-C fiber brush contact, comprising Ag fiber (silver fiber) 1 and C fiber (carbon fiber) 2. According to the total volume of the new Ag-C fiber brush contact, the Ag fiber accounts for 20%-30% of the total volume of the new Ag-C fiber brush contact, and the C fiber accounts for 5%-10% of the total volume of the new Ag-C fiber brush contact.

[0027] The preparation method of the novel Ag-C fiber brush contact comprises the following steps:

[0028] Step 1: According to the total volume of the novel Ag-C fiber brush contact, Ag fibers accounting for 20%-30% of the total volume of the novel Ag-C fiber brush contact and C fibers accounting for 5%-10% of the total volume of the novel Ag-C fiber brush contact are respectively taken;

[0029] Step 2: Cut the Ag fibers into the same length and arrange them in a directional manner, cut the carbon fibers into the same length and arrange them in a dispersed directional manner, take a portion of the Ag fibers and lay them on the Cu mesh (copper mesh) 3, and then lay a layer of the dispersed C fibers on the Ag fibers, and stack and lay them layer by layer for use;

[0030] Specifically, in the step 2, the lengths of the Ag fiber and the C fiber after cutting are both 20-30 mm;

[0031] Step 3: Use the Cu mesh to wrap and fix the Ag fiber and the C fiber to form a mixture, and place it vertically, and then weld a wire at one end of the Cu mesh for conductive test lead wire;

[0032] Step 4: Use resin to fill and fix the Ag fiber, the C fiber, and one end face of the Cu mesh and coat the surface of the Cu mesh. After the resin is hardened, the novel Ag-C fiber brush contact in which the C fiber evenly separates the Ag fiber can be obtained.

[0033] Comparative Example 1

[0034] In this comparative example, according to the total volume of the novel Ag-C fiber brush contact, the Ag fiber accounts for 20% of the total volume of the novel Ag-C fiber brush contact, the C fiber accounts for 0% of the total volume of the novel Ag-C fiber brush contact, and the Cu mesh accounts for 0% of the total volume of the novel Ag-C fiber brush contact. The structure of the obtained novel Ag-C fiber brush contact is as follows: Figure 3 shown.

[0035] This comparative example was prepared, and a pin-on-disk test was carried out. A high-speed test was carried out at a speed of 1000 r / min. The friction coefficient fluctuated within the range of 0.6-1. The wear rate of the prepared new Ag-C fiber brush contact was 10 -13 m 3 / Nm, the stable wear distance reaches 10km.

[0036] Comparative Example 2

[0037] In this comparative example, according to the total volume of the novel Ag-C fiber brush contact, the Ag fiber accounts for 30% of the total volume of the novel Ag-C fiber brush contact, the C fiber accounts for 20% of the total volume of the novel Ag-C fiber brush contact, and the Cu mesh accounts for 10% of the total volume of the novel Ag-C fiber brush contact. The structure of the obtained novel Ag-C fiber brush contact is as follows: Figure 4 shown.

[0038] This comparative example was prepared, and a pin-on-disk test was carried out. A high-speed test was carried out at a speed of 1000 r / min. The friction coefficient fluctuated within the range of 0.1-1. The wear rate of the prepared new Ag-C fiber brush contact was 10 -14 m 3 / Nm, the stable wear distance reaches 60km.

[0039] Example 1

[0040] In this embodiment, according to the total volume of the novel Ag-C fiber brush contact, the Ag fiber accounts for 20% of the total volume of the novel Ag-C fiber brush contact, the C fiber accounts for 5% of the total volume of the novel Ag-C fiber brush contact, and the Cu mesh accounts for 3% of the total volume of the novel Ag-C fiber brush contact. The structure of the obtained novel Ag-C fiber brush contact is as follows: Figure 5 shown.

[0041] This embodiment was prepared, and a pin-disk test was carried out. A high-speed test was carried out at a speed of 1000 r / min. The average friction coefficient was 0.25, and the wear rate of the prepared new Ag-C fiber brush contact was better than 10 -15 m 3 / Nm, the stable wear distance reaches 100km.

[0042] Example 2

[0043] In this embodiment, according to the total volume of the novel Ag-C fiber brush contact, the Ag fiber accounts for 30% of the total volume of the novel Ag-C fiber brush contact, the C fiber accounts for 10% of the total volume of the novel Ag-C fiber brush contact, and the Cu mesh accounts for 5% of the total volume of the novel Ag-C fiber brush contact. The structure of the obtained novel Ag-C fiber brush contact is as follows: Figure 6 shown.

[0044] This embodiment was prepared, and a pin-on-disk test was carried out. A high-speed test was carried out at a speed of 1000 r / min. The average friction coefficient was 0.2, and the wear rate of the prepared new Ag-C fiber brush contact was better than 10. -15 m 3 / Nm, the stable wear distance reaches 100km.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of Ag-C fiber brush contact, characterized in that: It comprises Ag fibers and C fibers. According to the total volume of the novel Ag-C fiber brush contact, the Ag fibers account for 20%-30% of the total volume of the novel Ag-C fiber brush contact, and the C fibers account for 5%-10% of the total volume of the novel Ag-C fiber brush contact.

2. The novel Ag-C fiber brush contact according to claim 1 is characterized in that: In the novel Ag-C fiber brush contact, the lengths of the Ag fiber and the C fiber are both 20-30 mm, and the Ag fiber and the C fiber are wrapped with a Cu mesh to form a mixture.

3. The novel Ag-C fiber brush contact according to claim 1 is characterized in that: The wear rate of the new Ag-C fiber brush contact is better than 10 -15 m 3 / Nm, the stable wear distance reaches 100km.

4. The method for preparing the novel Ag-C fiber brush contact according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: According to the total volume of the novel Ag-C fiber brush contact, Ag fibers accounting for 20%-30% of the total volume of the novel Ag-C fiber brush contact and C fibers accounting for 5%-10% of the total volume of the novel Ag-C fiber brush contact are respectively taken; Step 2: Cut the Ag fibers into the same length and arrange them in a directional manner, cut the carbon fibers into the same length and arrange them in a dispersed directional manner, take a portion of the Ag fibers and lay them on the Cu mesh, then lay a layer of the dispersed C fibers on the Ag fibers, and stack and lay them layer by layer for use; Step 3: Use the Cu mesh to wrap and fix the Ag fiber and the C fiber to form a mixture, and place it vertically, and then weld a wire at one end of the Cu mesh for conductive test lead wire; Step 4: Use resin to fill and fix the Ag fiber, the C fiber, and one end face of the Cu mesh and coat the surface of the Cu mesh. After the resin is hardened, the novel Ag-C fiber brush contact in which the C fiber evenly separates the Ag fiber can be obtained.

5. The novel Ag-C fiber brush contact according to claim 4 is characterized in that: In the step 2, the lengths of the Ag fibers and the C fibers after cutting are both 20-30 mm.

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