CN102382491B - Coating composition with functions of friction resistance and wear resistance - Google Patents
Coating composition with functions of friction resistance and wear resistance Download PDFInfo
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- CN102382491B CN102382491B CN 201110283470 CN201110283470A CN102382491B CN 102382491 B CN102382491 B CN 102382491B CN 201110283470 CN201110283470 CN 201110283470 CN 201110283470 A CN201110283470 A CN 201110283470A CN 102382491 B CN102382491 B CN 102382491B
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Abstract
The invention relates to a coating composition with functions of friction resistance and wear resistance, which is a powdered mixture composed of titanium carbide powder, nickel-coated calcium fluoride powder, nickel-coated graphite powder, yttrium oxide powder and nickel-based alloy powder, the weight ratio of each component is that: 23-25, 13-15, 8-10, 1, 50-55, wherein the mass part of each element in the nickel-based alloy are: 0.8% of C, 15.5 of Cr, 4% of Si, 3.5% of B, 15% of Fe and 61.2% of Ni. The coating composition with functions of friction resistance and wear resistance can be deposited on a frictional pair surface of a member through a plasma spraying mode to form a self lubricating coating, and is capable of greatly reducing the frictional coefficient, raising the wear resistance performance of the frictional pair of the member, solving the problems of friction resistance and wear resistance of a stress mechanical device with dry friction and high contact which is exposed in the adverse environment, and reducing the frictional energy consumption of the machinery.
Description
Technical field
The present invention relates to a kind of coating composition for friction member surface self-lubricating coating, particularly a kind of anti-friction wear-resistant coating composition with low-friction coefficient, high-wear resistance.
Background technology
Many heavy mechanical equipments, for example roller and the guide rail of standard steel bridge flat push type erecting device, the pin tooth wheel set, the crawler belt of tracked vehicle traveling mechanism and supporting-point roller, guide deflection sheave, driving wheel, the gear ring of the traversing mechanism of excavator and gear, the transmission rig of ball mill, the traversing mechanism of lifting machine, the metallurgical industry process furnace metal friction submembers such as chassis drag body, its working-yard often dust is filled the air, the friction member that equipment comprises need be exposed in the severe environment, at high contact stress, work under the metal to-metal contact working condition, can't utilize lubricating oil or lubricating grease, so that the frictional coefficient of friction pair is very large, cause serious friction energy loss and the Fast Wearing of friction member, thereby reduced transmission efficiency and the work-ing life of friction pair, and even affected work-ing life and the safe reliability of complete machine.For this reason, in recent years, the researchist is intended to develop the coating that can form at the friction member working face self-lubricating coat in use, in order to improve high contact stress, metal to-metal contact, to be exposed to the frictional behaviour of the friction member of operation in the abominable Working environment that dust fills the air.At present more existing achievements in research, for example, the patent of application number CN00113623.2 discloses a kind of composition than being the wear-resisting compound coating of cobalt/tungsten carbide powder of Co: WC=15～25%: 85～75%, the preparation of employing plasma spraying method, this coating can improve the wear resistance on steel surface, but this wear-resistant coating frictional coefficient is higher.The patent of application number CN200510050611.8 discloses a kind of self-lubricated composite plating in multiple layers and preparation method thereof (MoS
2Powder, pure S powder and metal M o sheet are basic raw material, adopt magnetron sputtering and multi-arc ion coating repeatedly to intersect sputtering sedimentation metal M o layer and IF-MoS
2The layer and make.), its manufacturing approach craft equipment complex and expensive, its self-lubricating coat in use is high to the friction pair environmental requirement, and it is fast to lose efficacy under high contact stress condition, is difficult to satisfy the requirement of anti-friction wear-resistant under the severe rugged environment condition.Be that these coatings can not reach high wear resistance performance and these two requirements of low-friction coefficient simultaneously.In addition, the research of adopting laser melting and coating technique to prepare the composite material surface coating also has relevant report, but the laser melting and coating technique cost is higher, and needs encloses container, and the encloses container volume is limited, can't process some complex structures or the larger member of volume.
Summary of the invention
The purpose of this invention is to provide a kind of anti-friction wear-resistant coating composition, it can adopt the thermospray mode to be deposited over the friction member surface, formation has the self-lubricating coat in use of high antifriction, high-wear resistance, decrease frictional coefficient not only, and significantly improve its abrasion resistance properties, thereby solve the frictional wear problem of filling the air the mechanical friction member of operation under the high contact stress of working in the environment, the DRY SLIDING at dust.
The pulverulent mixture that coating composition of the present invention is comprised of titanium carbide powder, nickel bag Calcium Fluoride (Fluorspan) powder, Nickel coated graphite, yttrium oxide powder and Co-based alloy powder, each component is pressed following weight part proportioning:
Titanium carbide powder 23～25,
Nickel bag Calcium Fluoride (Fluorspan) powder 13～15,
Nickel coated graphite 8～10,
Yttrium oxide powder 1,
Co-based alloy powder 50～55;
The quality group of each element becomes in the described nickel-base alloy:
C 0.8, Cr 15.5, Si 4, B 3.5, Fe 15 and Ni 61.2.
Described titanium carbide powder granularity is 2 μ m～4 μ m.
Described nickel bag Calcium Fluoride (Fluorspan) powder granularity is 75 μ m～128 μ m.
Described Nickel coated graphite granularity is 75 μ m～128 μ m.
Described yttrium oxide powder granularity is 15 μ m～45 μ m.
Described Co-based alloy powder granularity 55 μ m～128 μ m.
The friction member self-lubricating coat in use adopts the deposited surface of friction pair in friction member of plasma spraying to form by above-mentioned anti-friction wear-resistant coating composition.
Before carrying out plasma spraying with the anti-friction wear-resistant coating composition, with silicon carbide the surface of friction pair of steel friction member is carried out sandblasting, sandblast rear surface roughness Ra=3.5 μ m～4.5 μ m first.
Described self-lubricating coat in use thickness is 350 μ m～450 μ m.
Complex phase solid lubrication powder and titanium carbide powder that this coating composition adopts nickel to coat, rare-earth oxidation yttrium powder and Co-based alloy powder are mixed and made into composite powdered material, utilize plasma spraying technology that it is deposited in the friction member surface, form self-lubricating coat in use at surface of friction pair, the high antifriction coefficient of coating is low, wear resisting property is high, be applicable to the friction member that some must be exposed to the mechanical means of operation in the severe environment, particularly can't implement the metal friction submember of working under the lubricated high contact stress condition of metal to-metal contact with lubricating oil or lubricating grease, solved the friction member of under these harsh friction conditions, working, antifriction and wear-resisting problem, thereby improve the work-ing life of friction member, reduce its friction energy loss in operation process, reach energy-saving and cost-reducing purpose.This coating composition can directly use in the manufacturing processed of friction member, also can use in the repair process of friction member, thereby the abrasion resistance properties of decrease frictional coefficient and raising friction pair member, reduce its friction energy loss in operation process, significantly improve transmission efficiency and the work-ing life of friction pair, reach energy-saving and cost-reducing purpose.
Description of drawings
Fig. 1 is interface structure microscopy (SEM photo) figure of this coating composition coating and matrix.
Fig. 2 is the Test of Friction graphic representation
Fig. 3 is wear weight loss trial curve figure
Fig. 4 is the wear weight loss graphic representation to the couple of rubbing (GCr15).
Embodiment
The preparation of embodiment 1 anti-friction wear-resistant coating composition
The preparation of material:
(1) titanium carbide (TiC) powder, granularity 2 μ m～4 μ m, commercially available, river, the Zhuzhou vast hard material of tungsten company limited produces.TiC content 99.52%, surplus is free C, O, N, Fe, Al, the impurity such as Na.
(2) nickel bag Calcium Fluoride (Fluorspan) (CaF
2-Ni) powder: Beijing Sheng Bogaotai optics Science and Technology Ltd. produces, and is the CaF of 35 μ m～37 μ m by granularity
2Carry out nickel with hydroxyl nickel decomposition method and coat processing, product nickel bag Calcium Fluoride (Fluorspan) powder granularity is 75 μ m～128 μ m.
(3) (powder of graphite-Ni): commercially available, Shanghai one sail graphite company limited produces nickel bag graphite, is that the Graphite Powder 99 of 3 μ m～5 μ m carries out nickel with hydroxyl nickel decomposition method and coats processing, product Nickel coated graphite granularity 75 μ m～128 μ m by granularity.
(4) yttrium oxide (Y
2O
3) powder: granularity 15 μ m～45 μ m, commercially available, the good logical novel material company limited in Ganzhou produces.
(5) Co-based alloy powder: granularity 55 μ m～128 μ m, commercially available, Si Taili company in Shanghai produces, and chemical constitution (wt %) is: C 0.8, and Cr 15.5, and Si 4, and B 3.5, and Fe 15, and Ni 61.2.
Taking by weighing above-mentioned powder is respectively: titanium carbide 240 grams, and nickel bag Calcium Fluoride (Fluorspan) 140 grams, nickel bag graphite 90 grams, yttrium oxide 10 grams, nickel-base alloy 520 grams, fully mixing gets coating composition.
Except above-mentioned weight proportion, each component all can be mixed with effective coating composition in the ratio range that the present invention limits, and differs one for example at this.
The formation of embodiment 2 coatings
Adopt plasma spraying technology that aforementioned coating composition is deposited on the steel friction member surface, technological process is as follows:
(1) first with silicon carbide to 45
#Sandblasting is carried out on steel (or other carbon steel) friction member surface, sandblast rear surface roughness Ra=3.5 μ m～4.5 μ m.
(2) adopt DH1080 type plasma spraying equipment to the coating composition of friction member surface spraying embodiment 1, processing parameter: electric current 600A, voltage 30V, spray distance 100mm, the translational speed 0.01m/s of nozzle, coating thickness are 350 μ m～450 μ m.
(3) by ground finish, with friction member sprayed coating surface working to required precision.
Coating is carried out Analysis on Microstructure, and such as Fig. 1, coating structure is fine and close, is combined firmly with matrix, and the microhardness of coating reaches HV600.6.White bright area is nickel-base alloy among the figure, and black region mostly is graphite.
The performance test of embodiment 3 coatings
Test is take the GCr15 steel ball as to the couple of rubbing, on HT-500 type ball-disc type friction wear testing machine respectively to the coating, 45 of embodiment 2
#Steel, weldox960 high-strength alloy structure iron rub.
Test conditions is: room temperature (25 ℃), relative air humidity is RH60%, metal to-metal contact, sliding velocity is 0.1m/s, be respectively 12.7MPa, 38.2MPa, 63.7MPa with 6N, 8N, contact stress that 10N, 12N(are corresponding successively, 127.4MPa) load test friction and wear test results such as Fig. 2～shown in Figure 4.
Change curve such as Fig. 2 of three's the friction coefficient load, the frictional coefficient of coating composition coating of the present invention in 0.085～0.14 scope, 45
#The frictional coefficient of steel is between 0.32～0.38, and Sweden import weldox960 high-strength alloy structure iron frictional coefficient is between 0.26～0.37.As seen, compound coating frictional coefficient of the present invention has reduced by 48%～76% than Sweden import weldox960 high-strength alloy structure iron, has reduced by 60%～73% than 45 steel;
Three's wear weight loss is with change curve such as Fig. 3 of load, the wear weight loss of coating composition coating of the present invention in 0.3mg～1.5mg scope, 45
#The wear weight loss of steel is between 2.1mg～14.9mg, and Sweden import weldox960 high-strength alloy structure iron wear weight loss is between 3.2mg～8.1mg.The abrasion resistance properties of compound coating of the present invention is 45
#3.5～16.8 times of steel are 5.3～14.6 times of Sweden import weldox960 high-strength alloy structure iron.
In addition, to rub couple respectively with the three when rubbing, the wear weight loss of GCr15 steel ball is with change curve such as Fig. 4 of load: to rubbing couple and coating composition coating of the present invention when rubbing, the wear weight loss of GCr15 steel ball is in 0.0075mg～0.0334mg scope, to couple and 45 of rubbing
#Steel is when rubbing, and the wear weight loss of GCr15 steel ball is between 0.2234mg～0.3876mg, and to rubbing couple and Sweden import weldox960 high-strength alloy structure iron when rubbing, the wear weight loss of GCr15 steel ball is between 0.0097mg～0.0532mg.As seen, with compound coating of the present invention when rubbing, the wear rate of couple (GCr15) is minimum, is respectively and 45
#Steel when rubbing 2%～12%, with Sweden import weldox960 high-strength alloy structure iron when rubbing 63%～87%.
The present embodiment shows, the antifriction of compound coating of the present invention and wear resisting property are all very excellent, and its wearing and tearing to the couple material that matches with it are also very little.
Claims (2)
1. anti-friction wear-resistant coating composition is characterized in that the pulverulent mixture that is comprised of titanium carbide powder, nickel bag Calcium Fluoride (Fluorspan) powder, Nickel coated graphite, yttrium oxide powder and Co-based alloy powder, and each component is by following weight part proportioning:
Titanium carbide powder 23～25,
Nickel bag Calcium Fluoride (Fluorspan) powder 13～15,
Nickel coated graphite 8～10,
Yttrium oxide powder 1,
Co-based alloy powder 50～55;
Wherein, the titanium carbide powder granularity is 2 μ m～4 μ m, and nickel bag Calcium Fluoride (Fluorspan) powder granularity is 75 μ m～128 μ m, and the Nickel coated graphite granularity is 75 μ m～128 μ m, and the yttrium oxide powder granularity is 15 μ m～45 μ m, Co-based alloy powder granularity 55 μ m～128 μ m;
The mass percent of each element is in the described nickel-base alloy:
C 0.8, Cr 15.5, Si 4, B 3.5, Fe 15 and Ni 61.2.
2. a friction member self-lubricating coat in use is characterized in that adopting the deposited surface of friction pair in friction member of plasma spraying to form by anti-friction wear-resistant coating composition claimed in claim 1.
3. friction member self-lubricating coat in use according to claim 2, it is characterized in that before carrying out plasma spraying with the anti-friction wear-resistant coating composition, with silicon carbide the surface of friction pair of steel friction member is carried out sandblasting, sandblast rear surface roughness Ra=3.5 μ m～4.5 μ m first.
4. according to claim 2 or 3 described friction member self-lubricating coat in use, it is characterized in that described self-lubricating coat in use thickness is 350 μ m～450 μ m.
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| CN 201110283470 CN102382491B (en) | 2011-09-22 | 2011-09-22 | Coating composition with functions of friction resistance and wear resistance |
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| CN103060614B (en) * | 2012-12-08 | 2015-07-01 | 沈阳飞机工业（集团）有限公司 | Nickel-coated graphite self-lubricating composite material and application thereof |
| EP3084026B1 (en) | 2013-06-17 | 2019-09-18 | Höganäs AB (publ) | Powder for surface coating |
| CN104495569B (en) * | 2014-12-01 | 2017-02-22 | 苏州默顿快速电梯有限公司 | Passenger elevator guide pulley |
| CN107338436A (en) * | 2017-06-28 | 2017-11-10 | 河海大学 | A kind of iron-based composite coating and its preparation method and application |
| CN107460475B (en) * | 2017-07-06 | 2019-04-09 | 东南大学 | A kind of self-lubricating bearing and preparation method thereof |
| CN109868474B (en) * | 2019-04-11 | 2020-10-13 | 陕西理工大学 | Laser cladding method of titanium alloy |
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| GB9816190D0 (en) * | 1998-07-25 | 1998-09-23 | Dow Corning Gmbh | Antifriction coating |
| KR100655366B1 (en) * | 2005-07-04 | 2006-12-08 | 한국과학기술연구원 | Coating material having heat and abrasion resistance and low friction characteristics and coating method thereof |
| US8034153B2 (en) * | 2005-12-22 | 2011-10-11 | Momentive Performances Materials, Inc. | Wear resistant low friction coating composition, coated components, and method for coating thereof |
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