CN111218111B - Self-lubricating wear-resistant material and preparation method and application thereof - Google Patents
Self-lubricating wear-resistant material and preparation method and application thereof Download PDFInfo
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- CN111218111B CN111218111B CN202010147016.0A CN202010147016A CN111218111B CN 111218111 B CN111218111 B CN 111218111B CN 202010147016 A CN202010147016 A CN 202010147016A CN 111218111 B CN111218111 B CN 111218111B
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- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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Abstract
The invention provides a self-lubricating wear-resistant material and a preparation method and application thereof, belonging to the field of self-lubricating wear-resistant materials. According to the invention, molybdenum disulfide, graphite, lead powder and polytetrafluoroethylene are used as a lubricant together, and external oiling lubrication is not required, so that the requirement of the self-lubricating property of the product is met; the polyimide, the polytetrafluoroethylene and the glass fiber are used as the body adhesive, so that the requirement of high corrosion resistance under special working conditions can be met; the tensile strength (20 ℃) of the self-lubricating wear-resistant material is more than or equal to 190N/mm 2 (ii) a The compressive strength (20 ℃) is more than or equal to 520N/mm 2 (75 ksi); the yield strength (20 ℃) is more than or equal to 310N/mm 2 (ii) a The temperature resistance is 250 ℃; the glass transition temperature is 320 ℃; the friction coefficient is 0.18-0.25; the hardness HRC is 50-65; the surface quality is free from defects by visual inspection, and the material is an excellent sliding bearing or sliding plate manufacturing material.
Description
Technical Field
The invention relates to the technical field of self-lubricating wear-resistant materials, in particular to a self-lubricating wear-resistant material and a preparation method and application thereof.
Background
The used wear-resisting slide of metallurgical industry is vice, and it is vice mostly metal and metal friction, need refuel lubricated maintenance, and to some special mechanical equipment or sliding part, because receive special operating mode conditions influences such as high temperature, high pressure, corruption, can't realize normally refueling to it and maintain, lead to equipment to scrap in advance. For example, steel rolling mills, especially the blade guide sliding plate of a steel plate shearing machine, need to roll steel plates at high temperature, and the rolling process needs a large amount of corrosive cooling liquid to cool the steel plates, and the equipment needs to be operated continuously. In the working process, oil can not be added, and the slide plate is easy to corrode and rust due to cooling liquid; for example, the high-temperature steel plate is wound on the winding drum of the steel plate coiler, so that oil can not be added to lubricate and cool the sliding plate in the winding drum, the winding drum is usually blocked due to high-temperature dry friction, equipment is easily seriously abraded, even the running is unreliable, and the equipment enters the abrasion limit in advance to be scrapped.
Therefore, the improvement of the wear-resistant material and the provision of the self-lubricating wear-resistant material which can resist higher temperature, high pressure, high wear resistance and high corrosion resistance have important significance.
Disclosure of Invention
The invention aims to provide a self-lubricating wear-resistant material, a preparation method and application thereof, wherein the self-lubricating wear-resistant material realizes technical performance indexes of special performance requirements of metallurgical industry such as high temperature resistance, high pressure resistance, high wear resistance, high corrosion resistance and the like.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a self-lubricating wear-resistant material which comprises the following preparation raw materials in percentage by mass: 8-12% of short carbon fiber, 0.5-1% of glass fiber, 2-3% of molybdenum disulfide, 1-2% of graphite, 2-3% of polytetrafluoroethylene, 1% of lead powder and the balance of polyimide.
Preferably, the type of the chopped carbon fibers is T400, and the fiber length is 1-6 mm.
Preferably, the glass fiber is powder, and the particle size of the glass fiber is 9-13 μm.
Preferably, the particle sizes of the molybdenum disulfide and the graphite are independently 400 to 600 meshes.
Preferably, the polytetrafluoroethylene is powder, and the particle size of the polytetrafluoroethylene is 5-15 microns.
Preferably, the particle size of the lead powder is 200 meshes.
Preferably, the type of polyimide is a YZPIMP type.
The invention provides a preparation method of the self-lubricating wear-resistant material in the technical scheme, which comprises the following steps:
mixing short carbon fibers, glass fibers, molybdenum disulfide, graphite, polytetrafluoroethylene, lead powder and molten polyimide to obtain a mixed material;
and sequentially carrying out rolling blank making, vitrification treatment and machining on the mixed material to obtain the self-lubricating wear-resistant material.
Preferably, the mixing process comprises: mixing molybdenum disulfide, graphite, polytetrafluoroethylene and lead powder to obtain a first mixed material; mixing the first mixed material with glass fiber to obtain a second mixed material; mixing the second mixed material with the chopped carbon fibers to obtain a third mixed material; mixing the third mixed material with molten polyimide.
The invention provides an application of the self-lubricating wear-resistant material in the technical scheme or the self-lubricating wear-resistant material prepared by the preparation method in the technical scheme in the manufacture of sliding bearings or sliding plates.
The invention provides a self-lubricating wear-resistant material which comprises the following preparation raw materials in percentage by mass: 8-12% of chopped carbon fiber, 0.5-1% of glass fiber, 2-3% of molybdenum disulfide, 1-2% of graphite, 2-3% of polytetrafluoroethylene, 1% of lead powder and the balance of polyimide. According to the invention, molybdenum disulfide, graphite, lead powder and polytetrafluoroethylene are used as a lubricant, and the lubricant can be uniformly distributed on all parts of the self-lubricating wear-resistant material, so that the wear-resistant material is lubricated by the molybdenum disulfide, the graphite, the lead powder and the polytetrafluoroethylene in the relative movement process without external oiling lubrication, and the requirement of the self-lubricating property of the product is met; the polyimide, the polytetrafluoroethylene and the glass fiber are used as the body adhesive, so that the requirement of high corrosion resistance under special working conditions can be met; the common carbon fiber sliding bearing mostly adopts epoxy resin as a curing adhesive, resists temperature less than 160 ℃, and has hardness less than HRC35; the invention adopts polyimide as a curing adhesive, the high temperature resistance of the material is increased to 250 ℃, and the hardness is increased to HRC 50-65; finally, the self-lubricating wear-resistant material realizes the technical performance indexes of special performance requirements of metallurgical industry such as high temperature resistance, high pressure resistance, high wear resistance, high corrosion resistance and the like. The results of the examples show that the tensile strength (20 ℃) of the self-lubricating wear-resistant material is more than or equal to 190N/mm 2 (ii) a Resist againstThe compressive strength (20 ℃) is more than or equal to 520N/mm 2 (75 ksi); the yield strength (20 ℃) is more than or equal to 310N/mm 2 (ii) a The temperature resistance is 250 ℃; the glass transition temperature is 320 ℃; the friction coefficient is 0.18-0.25; the hardness HRC is 50-65; the surface quality is visually detected without defects, and the sliding bearing is qualified and is an excellent material for manufacturing sliding bearings or sliding plates.
Drawings
FIG. 1 is a schematic structural diagram of a sliding plate manufactured by using the self-lubricating wear-resistant material of the invention, 1-a sliding plate body, 2-a self-lubricating wear-resistant material, 3-chopped carbon fibers; a represents the position ofbase:Sub>A section, and A-A represents the corresponding cross section of the section.
Detailed Description
The invention provides a self-lubricating wear-resistant material which comprises the following preparation raw materials in percentage by mass: 8-12% of short carbon fiber, 0.5-1% of glass fiber, 2-3% of molybdenum disulfide, 1-2% of graphite, 2-3% of polytetrafluoroethylene, 1% of lead powder and the balance of polyimide.
In the present invention, unless otherwise specified, all the starting materials required for the preparation are commercially available products well known to those skilled in the art.
The raw materials for preparing the self-lubricating wear-resistant material comprise, by mass, 8-12% of chopped carbon fibers, preferably 9-11% of chopped carbon fibers, and more preferably 10% of chopped carbon fibers. In the present invention, the type of the chopped carbon fibers is preferably T400, and the fiber length is preferably 1 to 6mm, more preferably 3 to 5mm. The invention uses the chopped carbon fiber as the matrix material, realizes high strength, high wear resistance and high pressure resistance, and simultaneously realizes the characteristic requirement of high corrosion resistance.
The raw materials for preparing the self-lubricating wear-resistant material comprise, by mass, 0.5-1% of glass fiber, preferably 0.6-0.9%, and more preferably 0.7-0.8%. In the present invention, the glass fiber is preferably a powder, and the particle size of the glass fiber is preferably 9 to 13 μm, preferably 10 to 12 μm.
The raw materials for preparing the self-lubricating wear-resistant material comprise, by mass, 2-3% of molybdenum disulfide, preferably 2.2-2.8%, and more preferably 2.5-2.6%. In the present invention, the particle size of the molybdenum disulfide is preferably 400 to 600 mesh.
The raw materials for preparing the self-lubricating wear-resistant material comprise, by mass, 1-2% of graphite, preferably 1.2-1.8%, and more preferably 1.5-1.8%. In the present invention, the particle size of the graphite is preferably 400 to 600 mesh.
The raw materials for preparing the self-lubricating wear-resistant material comprise, by mass, 2-3% of polytetrafluoroethylene, preferably 2.2-2.8%, and more preferably 2.5-2.6%. In the present invention, the polytetrafluoroethylene is preferably a powder, and the particle size of the polytetrafluoroethylene is preferably 5 to 15 μm, more preferably 8 to 12 μm.
The raw materials for preparing the self-lubricating wear-resistant material comprise 1% of lead powder by mass percentage. In the present invention, the particle size of the lead powder is preferably 200 mesh. In the invention, the molybdenum disulfide, the graphite, the lead powder and the polytetrafluoroethylene are used as a lubricant together, and the molybdenum disulfide, the graphite, the lead powder and the polytetrafluoroethylene are uniformly distributed at all parts of the self-lubricating wear-resistant material, so that the molybdenum disulfide, the graphite, the lead powder and the polytetrafluoroethylene have a lubricating effect in the relative movement process of the material, and the requirement on the self-lubricating performance of the product is met without external oil lubrication.
The preparation raw materials of the self-lubricating wear-resistant material comprise the balance of polyimide in percentage by mass. In the present invention, the type of the polyimide is preferably a YZPIMP type. In the invention, the polyimide, the polytetrafluoroethylene and the glass fiber are used as a body adhesive and have self-lubricating property, and the materials are acid-base-resistant high-corrosion-resistance materials which can bear the high-corrosion-resistance requirement under the special working condition. The invention adopts polyimide, polytetrafluoroethylene and glass fiber powder as the binder of the sliding plate body, thereby ensuring the performance requirements of self-lubrication, high temperature resistance, high corrosion resistance and high strength of the material body.
The invention provides a preparation method of the self-lubricating wear-resistant material in the technical scheme, which comprises the following steps:
mixing short carbon fibers, glass fibers, molybdenum disulfide, graphite, polytetrafluoroethylene, lead powder and molten polyimide to obtain a mixed material;
and sequentially carrying out rolling blank making, vitrification treatment and machining on the mixed material to obtain the self-lubricating wear-resistant material.
The preparation method comprises the step of mixing chopped carbon fibers, glass fibers, molybdenum disulfide, graphite, polytetrafluoroethylene, lead powder and molten polyimide to obtain a mixed material. In the present invention, the mixing process preferably comprises: mixing molybdenum disulfide, graphite, polytetrafluoroethylene and lead powder to obtain a first mixed material; mixing the first mixed material with glass fiber to obtain a second mixed material; mixing the second mixed material with the chopped carbon fibers to obtain a third mixed material; mixing the third mixed material with molten polyimide. The mixing process of obtaining the first mixed material, the second mixed material, the third mixed material and the molten polyimide is not particularly limited, and the materials can be uniformly mixed by adopting a process known in the field. According to the invention, all powder materials are fully mixed, so that the uniformity of the powder materials in the product material body can be ensured. In the present invention, the molten polyimide is preferably obtained by heating polyimide to 200 ℃ in a stainless steel crucible to melt it.
After the mixed material is obtained, the invention sequentially carries out rolling blank making, vitrification treatment and mechanical processing on the mixed material to obtain the self-lubricating wear-resistant material. In the present invention, the rolling compaction is preferably performed in a rolling mixer, and the rolling compaction process is not particularly limited in the present invention, and may be performed by using a process well known in the art. After the rolling and blank making are finished, the obtained green body is preferably put into a die, a pressure cover is added, the die is sent into a vitrification press for vitrification treatment, the die is removed, and the obtained product is cut according to the test design size requirement of a sample to obtain the self-lubricating wear-resistant material. In the present invention, the temperature of the vitrification treatment is preferably 320 ℃, and the holding time is preferably 4 to 5 hours, and more preferably 4.5 hours. The mold, the vitrification press and the vitrification treatment are not particularly limited in the invention, and the equipment or the process well known in the art can be selected. The invention carries out vitrification treatment at 320 ℃, and can further improve the high temperature resistance and hardness of the material.
The self-lubricating wear-resistant material can be applied to plates, sleeves, tiles, gaskets and various chopped carbon fiber self-lubricating wear-resistant products with special shapes according to the design of a drawing.
The invention provides an application of the self-lubricating wear-resistant material in the technical scheme or the self-lubricating wear-resistant material prepared by the preparation method in the technical scheme in manufacturing sliding bearings or sliding plates. The method for applying the self-lubricating wear-resistant material to the manufacturing of the sliding bearing or the sliding plate is not particularly limited, and specifically, the self-lubricating wear-resistant material can be directly used as a raw material to manufacture the sliding bearing or the sliding plate according to the conventional manufacturing method of the sliding bearing or the sliding plate, as shown in fig. 1. The self-lubricating wear-resistant material is prepared by adopting a vitrification molding process, so that the manufactured sliding plate has higher strength and hardness, the strength, hardness and wear resistance of the self-lubricating bearing and the sliding plate are greatly improved, and the requirements of high wear resistance, high corrosion resistance and high pressure resistance of the product are met.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The mass percentages of the raw materials of examples 1-6 are shown in table 1;
the preparation method comprises the following steps:
weighing according to the formula proportion in the table 1, and respectively preparing chemical raw material components of each sample for later use by taking 600g of the total weight as the standard weight of each sample;
mixing molybdenum disulfide, graphite, polytetrafluoroethylene and lead powder to obtain a first mixed material; mixing the first mixed material with glass fiber to obtain a second mixed material; mixing the second mixed material with the chopped carbon fibers to obtain a third mixed material; heating the polyimide in a stainless steel melting pot (200 ℃) until the polyimide is melted to obtain melted polyimide, and preserving heat for later use; mixing the third mixed material with molten polyimide to obtain a mixed material;
and rolling the mixed material in a rolling mixer to prepare a blank, putting the obtained blank into a die, adding a pressure cover, sending the blank into a vitrification press to perform vitrification treatment (the temperature is 320 ℃, the heat preservation time is 4.5 hours), demolding, and cutting the obtained product according to the test design size requirement of a sample to obtain the self-lubricating wear-resistant material.
The products prepared in examples 1 to 6 were designated as 1# to 6# samples, respectively.
TABLE 1 COMPARATIVE TABLE FOR THE MATERIALS RATIO TEST OF PRODUCT SAMPLES PREPARED IN EXAMPLES 1-6
The product samples prepared in examples 1 to 6 were subjected to performance tests by a conventional method, and the results are shown in Table 2.
Table 2 data sheets for testing the main technical properties of the product samples prepared in examples 1 to 6
As can be seen from Table 2, the self-lubricating wear-resistant material provided by the invention has the technical performance indexes of special performance requirements of the metallurgical industry, such as high temperature resistance, high pressure resistance, high wear resistance, high corrosion resistance and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The self-lubricating wear-resistant material is characterized by being prepared from the following preparation raw materials in percentage by mass: 8-12% of short carbon fiber, 0.5-1% of glass fiber, 2-3% of molybdenum disulfide, 1-2% of graphite, 2-3% of polytetrafluoroethylene, 1% of lead powder and the balance of polyimide.
2. The self-lubricating wear-resistant material of claim 1, wherein the chopped carbon fibers are T400 type, and the fiber length is 1-6 mm.
3. The self-lubricating wear-resistant material of claim 1, wherein the glass fiber is powder, and the particle size of the glass fiber is 9-13 μm.
4. The self-lubricating, wear resistant material of claim 1 wherein the particle size of the molybdenum disulfide and graphite are independently 400 to 600 mesh.
5. The self-lubricating wear-resistant material according to claim 1, wherein the polytetrafluoroethylene is a powder, and the particle size of the polytetrafluoroethylene is 5-15 μm.
6. The self-lubricating wear resistant material of claim 1 wherein the lead powder has a particle size of 200 mesh.
7. Self-lubricating abradable material according to claim 1, wherein the polyimide is of the type YZPIMP.
8. The process for the preparation of self-lubricating wear-resistant material according to any one of claims 1 to 7, characterized by comprising the following steps:
mixing short carbon fibers, glass fibers, molybdenum disulfide, graphite, polytetrafluoroethylene, lead powder and molten polyimide to obtain a mixed material;
and sequentially carrying out rolling, blank making, vitrification treatment and machining on the mixed material to obtain the self-lubricating wear-resistant material.
9. The method of claim 8, wherein the mixing comprises: mixing molybdenum disulfide, graphite, polytetrafluoroethylene and lead powder to obtain a first mixed material; mixing the first mixed material with glass fiber to obtain a second mixed material; mixing the second mixed material with the chopped carbon fibers to obtain a third mixed material; mixing the third mixed material with molten polyimide.
10. Use of the self-lubricating wear-resistant material of any one of claims 1 to 7 or the self-lubricating wear-resistant material prepared by the preparation method of any one of claims 8 to 9 in the manufacture of a sliding bearing or a sliding plate.
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| CN109897376A (en) * | 2019-03-01 | 2019-06-18 | 中国科学院兰州化学物理研究所 | A kind of composite polyimide material and preparation method thereof |
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| CN109897376A (en) * | 2019-03-01 | 2019-06-18 | 中国科学院兰州化学物理研究所 | A kind of composite polyimide material and preparation method thereof |
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