Self-lubricating fabric friction member structure and method of making

Abstract

The application relates to the technical field of self-lubricating fabric, and discloses a self-lubricating fabric friction piece structure and a preparation method thereof, which comprises a sliding layer composed of a plurality of stacked fabric layers, the inside of each fabric layer and the space between adjacent fabric layers are bonded by an adhesive; each fabric layer is woven by warp yarns and weft yarns, the density of the warp yarns and the weft yarns in the fabric layers from bottom to top increases gradually, the content of the adhesive decreases gradually, and the interlacing points of the warp yarns and the weft yarns decrease gradually; a connecting layer is used for bonding the bottom of the sliding layer; a base body is used as a carrier of the sliding layer and is bonded with the sliding layer through the connecting layer; the density of the warp yarns and the weft yarns in the fabric layers from bottom to top of the self-lubricating fabric friction piece structure increases gradually, the content of the adhesive decreases gradually, so that the fabric layer at the top contains more self-lubricating fibers, the friction coefficient and the wear amount are lower when the fabric layer is in friction with a counter friction piece, and the fabric layer at the bottom contains higher resin adhesive, so that higher adhesive strength can be realized between the fabric layer and the connecting layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of self-lubricating fabric, in particular to a self-lubricating fabric friction piece structure and a preparation method thereof. BACKGROUND

[0002] Self-lubricating coating technology refers to a method of coating or plating solid substances on the interface of a friction pair as a solid lubricating material or a solid lubricant to lubricate the interface of the friction pair, so as to reduce friction or wear. Among various friction materials, fiber materials have attracted widespread attention due to their certain strength, toughness, impact resistance, shear resistance, tensile resistance and the like. Self-lubricating technology is applied in various fields, and is also widely applied in the field of self-lubricating bearings. Self-lubricating bearings are widely used in precision instruments, aerospace, military and nuclear power fields due to their low friction coefficient, corrosion resistance and maintenance-free advantages. In some special application conditions, self-lubricating bearings need to meet the requirements of high load and long service life, such as sliding bearings for temporary support of nuclear power steam generators. A layer of friction fiber with low friction coefficient is usually arranged on the surface of the self-lubricating bearing to ensure the wear resistance and low friction performance of the self-lubricating bearing.

[0003] The inventor finds that the thin sliding layer of the single-layer friction structure bearing is difficult to meet the long-term wear requirements of the counter friction piece under high load, and even the fabric layer is completely worn out and exposed to the base in the friction surface. In engineering practice, a certain thickness of resin substrate is also used as a sliding layer of the counter friction material, but the resin substrate is prone to compression creep under high load conditions, which causes persistent changes in the bearing structure, reduces the working reliability of the bearing, and even causes bearing failure and cannot be used. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a self-lubricating fabric friction piece structure and a preparation method thereof. The warp density and weft density of the fabric layers from bottom to top are gradually increased, and the adhesive content is gradually reduced, so that the fabric layer at the top has a lower friction coefficient and wear amount when it is rubbed with the counter friction piece, and the fabric layer at the bottom and the connecting layer have a higher adhesive strength, which meets the lubrication and friction requirements under high load conditions.

[0005] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0006] The first method is a self-lubricating fabric friction piece structure, comprising:

[0007] The sliding layer is composed of a plurality of stacked fabric layers, and the fabric layers and the adjacent fabric layers are bonded by an adhesive. Each fabric layer is woven by warp yarns and weft yarns, and the warp density and weft density of the fabric layers from bottom to top are gradually increased, the adhesive content is gradually reduced, and the interlacing points of the warp yarns and weft yarns are gradually reduced.

[0008] a connecting layer for bonding at the bottom of the sliding layer;

[0009] a base as a carrier of the sliding layer, bonded with the sliding layer through the connecting layer.

[0010] As a further implementation, the fabric layers are woven with self-lubricating fibers and reinforcing fibers as warp and weft.

[0011] As a further implementation, the thickness of the sliding layer is 0.5-3.0 mm, and the mass fraction of self-lubricating fibers in the fabric material of each fabric layer is greater than 50%.

[0012] As a further implementation, the warp density and weft density in the fabric layers are between 200-450 per 10 cm.

[0013] As a further implementation, fillers are added to the sliding layer, and the connecting layer is an adhesive.

[0014] As a further implementation, the sliding layer sequentially comprises a first fabric layer, a second fabric layer, and a third fabric layer from bottom to top.

[0015] As a further implementation, the fillers are arranged below the third fabric layer.

[0016] As a further implementation, the first fabric layer adopts plain weave, the second fabric layer adopts twill weave, and the third fabric layer adopts satin weave.

[0017] As a further implementation, the base is a metal structure, and the surface is sandblasted to enhance the bonding performance with the connecting layer.

[0018] In a second aspect, a preparation method of a self-lubricating fabric friction piece structure is provided, which comprises the following steps:

[0019] A plurality of fabric layers are formed by mixing self-lubricating fibers and reinforcing fibers, and then each fabric layer is soaked in an adhesive, and after stacking, the surface of the fabric layer is pressed by a soaking and pressing roller and then dried to form a sliding layer, wherein the fiber density of the fabric layers from bottom to top is gradually increased, and the interlacing points of the warp and weft are gradually reduced.

[0020] The surface of the base is sandblasted, and then an adhesive is coated on the surface of the base, and then the dried sliding layer is placed above the base and pressed by a pressing plate, and finally the sliding layer and the base are treated by a high-temperature pressing and curing process on a hot press to obtain the self-lubricating fabric friction piece structure as described in any one of the above.

[0021] The beneficial effects of the present application are as follows:

[0022] 1. The self-lubricating fabric friction piece structure of the present application increases the warp density and weft density of the fabric layers from bottom to top in turn, and reduces the adhesive content in turn, so that the fabric layer at the top contains more self-lubricating fibers, and the friction coefficient and wear amount are lower when rubbing against the counter friction piece, and the fabric layer at the bottom contains higher resin adhesive, which can achieve higher bonding strength with the connecting layer, thereby meeting the lubricating friction use requirements under high load working conditions.

[0023] 2. The fabric of the present application is woven by mixing self-lubricating fibers and reinforcing fibers, which ensures that the fabric layer has a lower friction coefficient while having a strong pressure bearing degree.

[0024] 3. The filler of the present application is arranged below the top surface of the third fabric layer, thereby ensuring the low friction performance of the top surface of the third fabric layer. The resin adhesive bonds the warp and weft yarns, ensuring the structural integrity of the sliding layer, and the filler further enhances the structural strength of the entire sliding layer.

[0025] 4. The sliding layer of the present application reduces the interlacing points of the warp and weft yarns in the fabric layers from bottom to top in turn, the first fabric layer uses satin fabric to contact the counter friction piece, the second fabric layer uses twill fabric as a transition layer, and the third fabric layer uses plain fabric with the highest structural strength to combine with the connecting layer, thereby making the sliding layer of the self-lubricating fabric friction piece have extremely low friction coefficient and high bonding strength. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of the present application serve to provide a further understanding of the present application, and the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application.

[0027] Figure 1 is a sectional view of the self-lubricating fabric friction piece structure in the embodiment of the present application;

[0028] Figure 2 is a front view of the self-lubricating fabric friction piece structure in the embodiment of the present application;

[0029] Figure 3 is a schematic diagram of a single fabric layer structure of the self-lubricating fabric friction piece in the embodiment of the present application;

[0030] Figure 4 is a schematic diagram of the overall structure of the self-lubricating fabric friction piece in the embodiment of the present application.

[0031] In the drawings: the mutual spacing or size is exaggerated to show the positions of various parts, and the schematic diagram is only illustrative.

[0032] Wherein: 1. base body, 2. connecting layer, 3. sliding layer, 4. fabric, 5. warp yarn, 6. weft yarn, 7. resin adhesive, 8. first fabric layer, 9. second fabric layer, 10. third fabric layer. Detailed Implementation

[0033] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0034] Example 1

[0035] In a typical embodiment of the present invention, reference is made to Figures 1-4 As shown, a self-lubricating fabric friction component structure includes a sliding layer 3, a connecting layer 2, and a substrate 1. The sliding layer 3 is used to contact the mating component and meet the requirements of long-term wear and tear under high load. The substrate 1 is made of metal and is used to bond to the sliding layer 3 through the connecting layer 2, serving as the carrier of the self-lubricating fabric friction component.

[0036] like Figure 1 As shown, the sliding layer 3 in this embodiment consists of several stacked fabric layers, each fabric layer 4 being woven from warp yarns 5 and weft yarns 6. The warp yarns 5 and weft yarns 6 are made of high-molecular self-lubricating fibers, which, after weaving, form a low-friction, wear-resistant material with high shear strength and fracture toughness, and are key components of the self-lubricating friction component.

[0037] Specifically, the self-lubricating fibers in the fabric material can be selected from PTFE (polytetrafluoroethylene), PEEK (polyether ether ketone), PE (polyethylene), etc. In this embodiment, PTFE is selected as the self-lubricating fiber.

[0038] To improve the structural strength of the fabric material, the fabric layer in this embodiment is woven with self-lubricating fibers and reinforcing fibers as warp yarns 5 and weft yarns 6. The reinforcing fibers can be carbon fiber, aramid fiber, glass fiber, etc., preferably carbon fiber. The self-lubricating fibers and reinforcing fibers are mixed and woven together, or the two are combined into one strand and woven together by twisting, wrapping, winding, etc. to form fabric 4. This allows the fabric layer to have a strong compressive strength while having a low coefficient of friction.

[0039] To ensure low friction of the friction components, the mass fraction of self-lubricating fibers in the fabric material of this embodiment must be above 50%.

[0040] The sliding layer 3 is composed of a multi-layered fabric structure 4 and a resin adhesive 7, specifically bonded within the fabric layers and between adjacent fabric layers by the resin adhesive 7. The preparation process involves first coating the surface of a single-layered fabric with the resin adhesive 7, or completely immersing the fabric in the resin adhesive 7. Then, after stacking each layer of fabric, pressure is applied to the fabric surface using a pressing roller to ensure the resin adhesive 7 completely penetrates the fabric. The multi-layered fabric is then dried for 30 minutes before use. The resulting sliding layer thickness is 0.5-3.0 mm. The resin adhesive 7 can be one or more of epoxy resin, phenolic resin, and polyimide resin, etc., formulated by mixing them. The resin adhesive accounts for 20-40% of the mass of the sliding layer.

[0041] The connecting layer 2 is used to bond to the bottom of the sliding layer. It is an adhesive and serves to connect the sliding layer 3 and the substrate 1. The adhesive can be applied to the substrate surface by spraying or brushing. Its thickness is 0.02-0.1mm. The connecting layer can significantly improve the bonding strength between the sliding layer 3 and the substrate 1.

[0042] The warp and weft density of a fabric material has a significant impact on its thickness, strength, and load-bearing capacity. The preferred warp and weft density is between 200 and 450 yarns / 10cm.

[0043] like Figure 4 As shown, taking the sliding layer 3, which comprises three fabric layers, as an example, the sliding layer consists of a first fabric layer 8, a second fabric layer 9, and a third fabric layer 10 from bottom to top. Introducing fillers into the fabric material can significantly improve the friction performance and load-bearing capacity of the fabric pad. Relevant fillers include metal oxides, metal sulfides, ceramics, or carbon-based fillers. A single filler or a combination of multiple fillers can be added to the fabric material to achieve a synergistic reinforcement effect that a single filler cannot achieve. The filler accounts for 0.5%-10% of the mass of the fabric material, the resin adhesive accounts for 20-40% of the mass, and the remainder is fiber content.

[0044] In this embodiment, the filler is located below the top surface of the third fabric layer 10, thereby ensuring the low friction performance of the top surface of the third fabric layer 10. The resin adhesive 7 bonds the warp and weft yarns, ensuring the structural integrity of the sliding layer 3, and the filler further enhances the structural strength of the entire sliding layer.

[0045] In this embodiment, the substrate is a metal structure, which can be iron, stainless steel, copper and copper alloys, aluminum and aluminum alloys, etc. Since the smooth surface of the metal substrate 1 has poor adhesion to the polymer adhesive, when the sliding layer 3 is connected to the substrate 1 through the connecting layer 2, the top surface of the substrate 1 is sandblasted to achieve a surface roughness between Ra2.0 and Ra20, thereby enhancing the bonding performance with the connecting layer. The metal substrate 1 can be a bearing substrate; connecting the sliding layer 3 to the bearing substrate 1 forms a self-lubricating bearing, thus meeting the long-term high-load usage requirements of the self-lubricating bearing.

[0046] The warp and weft yarn density of a fabric material has a significant impact on the resin content and abrasion resistance of the fabric. When the warp and weft yarn density decreases, the fabric density decreases, the gaps between the yarns become larger, the internal resin content increases, and fabric 4 has higher structural strength. At the same time, as the warp and weft yarn density decreases, the content of abrasion-resistant fibers per unit area decreases, and the abrasion resistance of the surface of fabric 4 deteriorates.

[0047] In this embodiment, the sliding layer 3 exhibits an increasing gradient in warp and weft density from bottom to top, resulting in a sequential decrease in adhesive content. The density can be as follows: first fabric layer 320 yarns / 10cm, second fabric layer 360 yarns / 10cm, and third fabric layer 400 yarns / 10cm. Because the lower warp and weft density of the lower fabric layer contains more resin adhesive, it achieves higher bonding strength with the connecting layer 2. Conversely, the higher warp and weft density of the upper (third fabric layer) fabric layer contains more self-lubricating fibers, resulting in a lower coefficient of friction and wear when rubbing against the mating parts.

[0048] like Figure 4 As shown, in the sliding layer 3, the interlacing points of warp yarns 5 and weft yarns 6 decrease sequentially from bottom to top. Fabrics woven where warp yarns 5 and weft yarns 6 interlace every other yarn are plain weave, characterized by numerous interlacing points, high structural strength, and an equal warp and weft yarn ratio. Fabrics woven where warp yarns 5 and weft yarns 6 interlace at least every two yarns are twill weave, characterized by fewer interlacing points and a higher warp yarn ratio. Fabrics where warp yarns 5 and weft yarns 6 form unconnected warp / weft weave points with no obvious pattern are satin weave, characterized by the fewest interlacing points, a smooth surface, and the highest warp yarn ratio. The first fabric layer 8 uses a plain weave, the second fabric layer 9 uses a twill weave, and the third fabric layer 10 uses a satin weave.

[0049] The fabric material in this example is woven from a mixture of self-lubricating fibers and reinforcing fibers, wherein the warp yarns are self-lubricating fibers and the weft yarns are reinforcing fibers.

[0050] In the plain weave, twill weave, and satin weave fabric structures, the increasing warp ratio leads to a continuous increase in the self-lubricating fiber content, thus improving the fabric's abrasion resistance. Conversely, the decreasing weft ratio leads to a gradual decrease in the reinforcing fiber content, resulting in a gradual decrease in the fabric's structural strength. Therefore, in the multi-layer fabric structure, the first fabric layer 8 uses an 8 / 5 satin weave fabric with the lowest coefficient of friction to contact the abrasive component; the second fabric layer 9 uses a 1 / 3 twill weave fabric as a transition layer; and the third fabric layer 10 uses a plain weave fabric with the highest structural strength to bond with the connecting layer 2. This allows the sliding layer 3 of the self-lubricating fabric friction component to possess both an extremely low coefficient of friction and high bonding strength.

[0051] Example 2

[0052] In a typical embodiment of the present invention, reference is made toFigures 1-4 As shown in the figure, a preparation method of a self-lubricating fabric friction piece structure is used to form the self-lubricating fabric friction piece structure in Example One, and comprises the following steps:

[0053] A plurality of fabrics 4 are formed by mixing and weaving the self-lubricating fibers and the reinforcing fibers, wherein the first fabric layer has 320 roots per 10 cm, the second fabric layer has 360 roots per 10 cm, and the third fabric layer has 400 roots per 10 cm; the first fabric layer 9 adopts plain weave, the second fabric layer 9 adopts twill weave, and the third fabric layer 10 adopts satin weave.

[0054] First, the surface of the single-layer fabric 4 is coated with a resin adhesive 7, or the fabric is completely immersed in the resin adhesive 7 with fillers, and then the first fabric layer 8, the second fabric layer 9, and the third fabric layer 10 are stacked and subjected to pressure treatment on the surface of the fabric 4 by using an immersion pressure roller, so that the resin adhesive is completely immersed into the fabric 4; the multi-layer fabric after immersion and pressure is placed in an oven at 80°C for drying for 30 minutes to form a sliding layer for use. The mass fraction of the resin adhesive 7 in the sliding layer 3 is 20-40%.

[0055] First, the surface of the sandblasted metal base 1 is uniformly coated with a polyurethane adhesive, and then the dried sliding layer is placed above the metal base and pressed with a pressing plate, and finally the multi-layer fabric and the metal base are subjected to high-temperature pressure curing process on a hot press to obtain.

[0056] It can be understood that the self-lubricating fabric friction piece structure of the embodiment can not only be used as a self-lubricating bearing, but also can be arbitrarily replaced with a corresponding metal base in other lubricated friction conditions to form a corresponding self-lubricating fabric friction piece structure.

[0057] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A self-lubricating fabric friction member structure characterized by, The application relates to a self-lubricating fabric friction piece structure. The sliding layer is composed of a plurality of stacked fabric layers which are bonded by an adhesive; each fabric layer is woven by warp yarns and weft yarns, and the warp yarn density and the weft yarn density of the fabric layers from bottom to top are gradually increased, the adhesive content is gradually reduced, and the interlacing points of the warp yarns and the weft yarns are gradually reduced; The connecting layer is used for bonding the bottom of the sliding layer; The base body is used as a carrier of the sliding layer and is bonded with the sliding layer through the connecting layer; The sliding layer comprises a first fabric layer, a second fabric layer and a third fabric layer from bottom to top. The first fabric layer adopts a plain weave, the second fabric layer adopts a twill weave, and the third fabric layer adopts a satin weave.

2. A self-lubricating fabric rubbing element structure according to claim 1, wherein The fabric layers are woven by self-lubricating fibers and reinforcing fibers.

3. A self-lubricating fabric rubbing element structure according to claim 2, wherein The thickness of the sliding layer is 0.5-3.0 mm, and the mass fraction of the self-lubricating fibers in the fabric material of each fabric layer is greater than 50%.

4. A self-lubricating fabric rubbing element structure according to claim 1, wherein The warp yarn density and the weft yarn density in the fabric layer are 200-450 per 10 cm.

5. A self-lubricating fabric rubbing element structure according to claim 1, wherein The sliding layer is additionally provided with a filler, and the connecting layer is an adhesive.

6. A self-lubricating fabric rubbing element structure according to claim 5, wherein The filler is arranged below the third fabric layer.

7. A self-lubricating fabric rubbing element structure according to claim 1, wherein The base body is a metal structure, and the surface is sandblasted to enhance the bonding performance with the connecting layer.

8. A method of making a self-lubricating fabric friction member structure, characterized by, The application further discloses a preparation method of the self-lubricating fabric friction piece structure. The self-lubricating fibers and the reinforcing fibers are mixed to form a plurality of fabrics; the fabrics are soaked in the adhesive, then each fabric layer is stacked, the surface of the fabric is pressed by a soaking and pressing roller, and the fabric is dried to form the sliding layer, wherein the fiber density of the fabric layers from bottom to top is gradually increased, and the interlacing points of the warp yarns and the weft yarns are gradually reduced; The surface of the base body is sandblasted, then the adhesive is coated on the surface of the base body, the dried sliding layer is placed above the base body and pressed by a pressing plate, and finally the sliding layer and the base body are treated by a high-temperature and high-pressure solidification process on a hot press to obtain the self-lubricating fabric friction piece structure according to any one of claims 1-7.

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