CN106148885A - A kind of at metal friction and wear surface preparation generating protective layer and preparation method thereof - Google Patents
A kind of at metal friction and wear surface preparation generating protective layer and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of at metal friction and wear surface preparation generating protective layer and preparation method thereof, it adopts the following technical scheme that: its formula composition is as follows: stratiform hydroxy silicate powder: 80-99；Surface modifier: 45-50；Carbonized graphite catalyst: 4-6；It uses makees carrier with lubricant, pharmaceutical formulation containing specific repair is sent into the CONTACT WITH FRICTION district of piece surface, the force-chemical reaction occurred between the 3rd bodies such as participating in reparation and wear particle is driven by the frictional heat of preparation and surface of friction pair and generation, surface of friction pair is made to obtain home position alloying strengthening so that it is to possess ceramic-metallic high rigidity and superior alloy steel characteristic.
Description
Technical field
The present invention relates to a kind of at metal friction and wear surface preparation generating protective layer and preparation method thereof.
Background technology
In China, abrasion, corrosion and fatigue are three kinds of principal modes of material failure.Data is had to point out: 1/3 to the 1/2 of worldwide energy output is used for overcoming frictional resistance.According to China's Metallurgical Mines, agricultural machinery, coal, electric power and the incomplete statistics of five departments of building materials, the material unaccounted-for (MUF) caused due to fretting wear every year and energy waste are up to billions of unit.Compare with industrially developed country, owing to the energy consumption of China's same industry output value is high, cause china natural resources waste very big, the target laid siege in energy-saving and cost-reducing always China's industrial development.
China, about the plant equipment of industry import, due to parts depreciation, need to supplement the about billions dollar of all kinds of spare parts of purchase every year.As a example by automobile, taxi each use cycle is 5--8, and period has overhaul 1-3 time, each accessory maintenance cost to be 3000-5000 unit.Including the gasoline consumption every 3000 yuan of running-in period, two or three general line city 10,000 chassis calculate, and the wasting of resources of nearly hundred million yuan consumes country's fund energetically and the energy.
The various internal combustion engine of China's production, steam turbine, reduction gear box etc., it is in the parts under high speed, high loaded process, affected by steel product quality and processing technique, all be there is serious fretting wear problem, caused the outstanding problem that its service life is low, fault rate is high, maintenance cycle is short.
This department is for above-mentioned situation; develop and generate the preparation of protective layer at metal friction with wear surface; it is in order to lubricator making carrier; pharmaceutical formulation containing specific repair is sent into the CONTACT WITH FRICTION district of piece surface; driven by the frictional heat of preparation and surface of friction pair and generation and participate in repairing power chemistry (tribochemistry) occurred between the 3rd body such as wear particle and react, make surface of friction pair obtain home position alloying and strengthen.
Such as: China's annual import bulk petroleum, automobile, boats and ships, beeliner are all using fuel oil as the energy.China's annual fuel consumption of diesel locomotive more than 500 ten thousand tons, uses " the galling intelligence repair materials " of this department to calculate by locomotive fuel oil consumption decline 4% in use afterwards, can save fuel oil 200,000 tons the most every year；Internal combustion engine is repaiied journey and is extended to 50-60 ten thousand kilometers by 300,000 kilometers, can also save every year a large amount of zero repair, supplementally take, in repair expense, (maintenance rate declines 1% at line use ratio to improve locomotive, be equivalent to the transport power of the whole nation 150 diesel locomotives of many inputs every day), if the scope of application to be expanded further to the systems easy to wear such as car axles, compressor, track, produced comprehensive benefit must be the most notable, and data will be more surprising.China is lubrication oil consumption big country, is only second to the United States, Russia.China consumes lubricating oil 3,400,000 tons every year, including from external import 500,000 tons.If IC engine lubricating oil uses " galling intelligence repair materials " superfine powder and the base oil of antioxidant attaching this department instead, existing internal combustion engine then can not only be made to realize " saving energy and reduce the cost ", and easily realize " exempting from overhaul throughout one's life " of electromotor, also can reduce the import volume of top-grade lubricating oil base oil.18,000,000 automobiles that its effect is had by China and millions of the ships with internal combustion engine as power, the energy resource consumption reduced, extend the life-span of tribological wear components, improve the overall economic efficiency of operation rate up to tens billion of units.Additionally, the fields such as China Textile Machinery, Petro-Chemical Machinery, mining machinery, metallurgical machinery all also exist short " bottleneck " in service life, these after using this department preparation, will be made thoroughly to change.
Thus the preparation at metal friction with wear surface generation protective layer designed by this department; the competitiveness of Chinese industrial products will be improved; drive the development of related industry; the national economic development there is significant impact; China is walked out high in technological content, low in resources consumption, a good in economic efficiency new road toward industrialization; realize national economy and save the energy and the strategic objective of these two human kind sustainable development of environmental conservation, significant.
Summary of the invention
Present invention aims to defect and the deficiency of prior art, a kind of simple in construction is provided, reasonable in design, easy to use generates preparation of protective layer and preparation method thereof at metal friction with wear surface, it uses makees carrier with lubricant, pharmaceutical formulation containing specific repair is sent into the CONTACT WITH FRICTION district of piece surface, driven by the frictional heat of preparation and surface of friction pair and generation and participate in repairing power chemistry (tribochemistry) occurred between the 3rd body such as wear particle and react, surface of friction pair is made to obtain home position alloying strengthening, it is made to possess ceramic-metallic high rigidity and superior alloy steel characteristic.
For achieving the above object, the technical solution used in the present invention is:
Of the present invention at metal friction and wear surface preparation generating protective layer and preparation method thereof, it adopts the following technical scheme that:
Its formula composition is as follows:
Stratiform hydroxy silicate powder: 80-99；
Surface modifier: 45-50；
Carbonized graphite catalyst: 4-6；
Its preparation method following method step of employing:
1) by above-mentioned weight proportion by subtraction example, native hydroxyl magnesium silicate ore powder and surface modifier are ground to form nanometer to the oil-soluble composite granule of micron dimension；
3) in step 1) in oil-soluble composite granule add carbonized graphite catalyst continue grind formed uniform combination powder；
3) by step 2) in uniform combination powder, the ratio of 0.1-5% in mass ratio is mixed in base lubricant, makes concentrating agents；
4) by step 3) in the concentrating agents for preparing, directly in concentrating agents: lubricant=1: the ratio of 9 joins in lubricant use.
Further, its formula composition is as follows: stratiform hydroxy silicate powder: 80-99；Surface modifier: 15-20；Carbonized graphite catalyst: 1-3.
Further, its formula composition is as follows: stratiform hydroxy silicate powder: 80-99；Surface modifier: 11-12；Carbonized graphite catalyst: 1.5-6.
Further, layered hydroxy silicate powder is hydroxyl magnesium silicate mineral powder.
Further, the combination of one or more during described hydroxyl magnesium silicate mineral powder refers to serpentine, Talcum, meerschaum, Actinolitum mineral powder.
After using said structure, present invention have the beneficial effect that of the present invention at metal friction and wear surface preparation generating protective layer and preparation method thereof, its employing of the present invention makees carrier with lubricant, pharmaceutical formulation containing specific repair is sent into the CONTACT WITH FRICTION district of piece surface, driven by the frictional heat of preparation and surface of friction pair and generation and participate in repairing power chemistry (tribochemistry) occurred between the 3rd body such as wear particle and react, surface of friction pair is made to obtain home position alloying strengthening, it is made to possess ceramic-metallic high rigidity and superior alloy steel characteristic.
Detailed description of the invention
Below invention is further described.
Of the present invention at metal friction and wear surface preparation generating protective layer and preparation method thereof, it adopts the following technical scheme that:
Its formula composition is as follows:
Stratiform hydroxy silicate powder: 80-99；
Surface modifier: 45-50；
Carbonized graphite catalyst: 4-6；
Its preparation method following method step of employing:
1) by above-mentioned weight proportion by subtraction example, native hydroxyl magnesium silicate ore powder and surface modifier are ground to form nanometer to the oil-soluble composite granule of micron dimension；
4) in step 1) in oil-soluble composite granule add carbonized graphite catalyst continue grind formed uniform combination powder；
3) by step 2) in uniform combination powder, the ratio of 0.1-5% in mass ratio is mixed in base lubricant, makes concentrating agents；
4) by step 3) in the concentrating agents for preparing, directly in concentrating agents: lubricant=1: the ratio of 9 joins in lubricant use.
One as the present invention is preferred, and its formula composition is as follows: stratiform hydroxy silicate powder: 80-99；Surface modifier: 15-20；Carbonized graphite catalyst: 1-3.
One as the present invention is preferred, and its formula composition is as follows: stratiform hydroxy silicate powder: 80-99；Surface modifier: 11-12；Carbonized graphite catalyst: 1.5-6.
One as the present invention is preferred, and layered hydroxy silicate powder is hydroxyl magnesium silicate mineral powder.
One as the present invention is preferred, and described hydroxyl magnesium silicate mineral powder refers to the combination of one or more in serpentine, Talcum, meerschaum, Actinolitum mineral powder.
Specific embodiment one:
1) its formula used is by as follows:
Serpentine (Mg6Si4O10 (OH) 8): 50；
Talcum (Mg3 (Si4O10) (OH) 2): 25；
NDZ-133 monoalkoxy fatty acid titanate coupling agent: 7；
Nano Pd particle O carbonized graphite catalyst: 0.5；
Pt carbonized graphite catalyst: 0.5；
2) with hydrotalcite composition granule and NDZ-133 monoalkoxy fatty acid titanate coupling agent, said ratio serpentine being added grinding in high energy ball mill, milling time 10 hours, rotating speed 800 revs/min, after grinding, powder granularity scope is 10nm-1 μm.
Then, add PdO and Pt nano particle carbonized graphite catalyst powder continues to grind 30 minutes, be and can add the preparation with self-repair function used in lubricating oil.
The above-mentioned preparation prepared is joined in SD/CC level 15W40 gasoline engine/diesel engine oil universal in the ratio of 1wt ‰, the test carried out on the bearing friction pair simulation test machine of large-scale trunnion axis suction pump.
In Bearing Simulation Tester; the material of its axle sample and bearing sample is respectively 45# steel and babbit; define the protective layer of about 2 μ m-thick at 45# steel friction surface after 27 hours bearing simulation tests; protective layer grows along the pearlitic texture skeleton of base material; and it is tightly combined between base material, there is no obvious physical interface.This protective layer is shown excellent anti-abrasive wear and antisticking polishing machine by tri-kinds of elementary composition protective layers of Fe, C and O.
The present invention it be not on metal friction surface generate soft metal protecting film (or politef protecting film); it it is not the copper by being dissolved in lubricating oil, molybdenum, the boron organic compound chemical bond framework that generates cupric, molybdenum, boron at friction surface; but generate, in the metal surface producing abrasion, the metal class ceramic layer that Wear vesistance is excellent; the plant equipment in being currently in use is made to repair the abrasion occurred with not disintegrating; it is allowed to return to Optimum clearance, reaches energy-conservation ortho states and recover and consumption reduction, the purpose in one service life in cycle of growth equipment.Jin Chi's comes into operation.China's anti-attrition wearing technic is made to study by the modification to metal material friction surface, step into the intelligent repairing phase to abrading section, by learning key lab, bearing quality supervision and inspection inspection center of country in Tsing-Hua University's friction, Commission of Science, Technology and Industry for National Defence first measures precision measurement research center, CNPC's lubricating oil studies the authoritative experiment testing agencies such as test development center, carrying out relevant test in laboratory to the brightest, the product attribute in plant equipment carries out confirmatory evaluation and test.Its testing result is as follows:
(1) detection case of Tsing-Hua University's tribology National Key Laboratory:
Tribology National Key Laboratory of Tsing-Hua University undertakes the test carrying out generating metal class pottery intelligence repair layer on friction wear testing machine, tests the thickness of metal class ceramic layer of cylinder inner wall generation, case hardness, coefficient of friction, surface smoothness test and appraisal when east wind DF-11 type high load capacity automotive diesel oil electromotor adds up to travel 150,000 kilometers.
Conclusion is as follows:
1. verify and generate the process of metal class pottery intelligent layer and shape characteristic thereof at sample friction surface:
On friction wear testing machine; 45# steel face contact friction pair sample is implemented " galling intelligence repair materials (present invention) " application technology; after testing machine adds up to run 150 hours, the average microhardness value of surface of friction pair is increased to 680 from the Hv=230 of initial surface, and (bringing up to Hv=680) protects intelligence repair layer with the metal class pottery of scanning electronic microscope observation to 8 microns on metallographic sample transverse section.
2. the thickness of the cermet coating that test cylinder inner wall generates:
The ceramic metal protective layer forming the cylinder liner surface of east wind No. 063 diesel engine the 15th cylinder of DF-11 type locomotive running 150,000 kilometers after using galling intelligence repair materials application technology is scanned electron microscopy observation; result shows: on the metallographic sample transverse section taking from cylinder sleeve, and the metal class ceramic protective layer of about 10 micron thickness is the most visible the most under an optical microscope or under scanning electron microscope.
3. the coefficient of friction of the ceramic metal protective layer of Self-adaptive:
On SRV friction wear testing machine; utilize and formed the lower sample that the automotive diesel oil machine cylinder sleeve of metal class ceramic protective layer cuts; prepare upper sample with to the first wife's chrome plated piston ring ground, be maintained at 0.005 to the stable friction factor recorded under conditions of oil-free lubrication (dry friction).
4. the microhardness of the metal class ceramic protective layer that detection cylinder inner wall generates:
The nano hardness measured value of cylinder inner wall matrix is 524, and generating the measured value after cermet coating is 1110.
5. the roughness on the metal class ceramic protective layer surface that detection cylinder inner wall generates.
(2) detection case of country's bearing quality Supervision Test Center:
Harbin Tianye Bearing Co., Ltd is produced by country's bearing quality Supervision Test Center, warp " self-repairing material for metal abrasion (present invention) " carries out the 6205-2RSIXI minicar tension wheel shaft bearing of surface process and carries out life test bearing collar path and rolling element.The routine test life-span of this bearing is L10=126h, now carries out 5 times of life test.Conclusion (of pressure testing) is:
1. the running accuracy of bearing: still keep the precision before test.When examination is to 3 times of life-spans, precision has declined, and when examination is to 5 times of life-spans, accuracy resumption is to original value.
2. the end-play of bearing: still keep the play before test.
3. bear vibration (speed) type: low frequency numerical value reduces, medium-high frequency numerical value increases.
Bear vibration (acceleration) type: numerical value increases.
4., when bearing examination is to 5 times of life-spans, bearing collar path, does not the most wear and tear in rolling element surface.
According to the requirement of State Economic and Trade Commission, bearing tried to 18 times of life-spans.
(3) detection case in Commission of Science, Technology and Industry for National Defence's the first metrology and measurement research center:
The number people such as Commission of Science, Technology and Industry for National Defence the first metrology and measurement research center researcher, test group is formed with Beijing internal combustion engine services section metrological personnel, the Diesel engine that the galling intelligence repair materials using the present invention runs east wind No. 063 diesel locomotive of DF-11 type to 300,000 kilometers has carried out decomposing test, test the abrasion condition (Ministry of Railways specifies: DF-11 type locomotive Diesel engine runs and should repair in carrying out to when 300,000 kilometers, parts easy to wear such as more rering etc.) of its piston ring, piston, cylinder jacket.
Test result is: the Diesel engine of No. 063 diesel locomotive of east wind DF-11 type numbered 159 is after the actual motion of 300,000 kilometers, and its piston, piston ring, the actual size of cylinder bore diameter remain at and meet new product dimensional requirement.
(4) detection case of CNPC's lubricating oil research and development centre:
Lubricating oil research and development centre of CNPC use base oil and in base oil add account for its weight 1.0% the present invention galling intelligence repair materials contrast oil, carry out extreme pressure, wear resistence contrast test.Conclusion (of pressure testing) is:
1. can be seen that from tetra-ball machine test result, autoreconditioning for worn metals agent adds in 80W/90 base oil with the dosage of 1%, the Pb value of the four ball Pb values representing test film strength, representative test oil pole limit ability to work is not the most produced impact, but to the four ball integrated abrasion value ZMZ tool effect of improving (ZMZ improves 10.16%), after being mainly manifested in Pb value (i.e. after rupture of oil film), with test load increase that wear scar diameter increases more slow, show that suppression mill speckle is increased and has preferably effect by the addition of JC galling intelligent repair agent.
2. can be seen that from simulation L-37 result of the test, nitti galling intelligent repair agent adds in 80W/90GL-5 vehicle wheel oil with the dosage of 1%, having some improvement the surface topography tool of mill speckle, show as mill speckle surface the most smooth, the ditch dug with a plow that abrasion produces disappears.
3. cam tappet is the parts that engine operation condition conditional is more harsh and abrasion is the most serious.Repair the multiple material performance in I. C. engine oil of intelligence for investigating galling, select convex very experimental machine to use " MRT type cam-tappet abrasion tester rating method " to be tested.Can be seen that from the result of the test listed, dosage is added in self-repairing material for metal abrasion additive to 10W/30 SF (in 2) and 10W/30SF/CD I. C. engine oil with 1%, compared with 10W/30 SF (in 2) and 10W/30 SF/CD oil test result, convex very weightless abrasion ditch dug with a plow substantially reduces, become apparent from especially with its effect of old test specimen, show preferable repair.
The effect of present invention application is as follows:
(1) energy-saving effect: typically can make dynamic power machine, automobile fuel economizing reaches more than 10---20%).
(2) environment protecting: make the harmful substance in engine exhaust tail gas greatly reduce (carbon monoxide and Hydrocarbon reduce 40-50%, and nitrogen oxides declines 16-18%, and the smokescope of diesel emission reduces 40-50%).Effect of vibration and noise reduction is notable, reaches 4-7 unit, the highest drops 90%, beneficially energy-conserving and environment-protective and prolongation parts service life.
(3) lengthen the life effect: due to declining to a great extent and anticorrosive (containing electrochemical corrosion) of coefficient of friction, and there is not the raising of Hydrogen induced cracking performance, add the improvement of surface microhardness, many composite factors, make plant equipment nearly reach zero abrasion state, be greatly prolonged service life.
(4) afterburning effect: work efficiency typically can be made to improve 5-10%, and many experiments reach to increase the good result of power 25-35%.
(5) consumption of lubricating oil effect is reduced: machine oil can be made to extend 1-5 times service life, not only economic benefits, extend the die-away time of machine oil, extend the use cycle of accessory, manufacturing industry, electric power, the consumption of coal are served absolute effect, in a city having 10,000 taxis, every program removing overhaul break-in from, directly can run at high speed, break-in needs to consume the gasoline money of 3000 yuan, has saved nearly 30,000,000 yuan of gasoline, if these gasoline combustions will be how long, discharging many of low pollutions, economic benefit, social benefit are considerable.
(6) cold start-up and the performance that drives safely under inorganic oil state: the traveling that can have no mechanical damage under inorganic oil state more than 200 kilometers.(except noting ensureing the temperature factor to oil sealing aging effects)
(7) can intelligence repair damage location, can remove from repair front engine accessory data and loaded down with trivial details inspection, parts where is it wear and tear, there is micro-damage on surface, where intelligence repair materials is just repaired, and is not limited only to surface, also up to certain depth (30 μm).
(8) intelligence wear-out defect can be mended.Making its modification due to intelligence repair materials energy activator metal surface generation displacement reaction, oneself grows therefore can accomplish to lack how much benefit is how many, till recovering original geometry and reaching best clearance.Carburizing or metal filled, without change in size, and grow only have change in size, at most can increase and reach 1.1mm, and have " chemical reaction generation blood relationship " relation with matrix, be class pottery and surface metal " quadroon ", without departing from peeling.
(9) can intelligence complete to repair and strengthening process.Without shutting down, exempting dismounting, do not affect equipment properly functioning, without idle cost.
Technology effect that the present invention realizes: at the nanocrystalline protective layer of metal friction Yu wear surface in-situ preparation anti-friction wear-resistant, be provided simultaneously with the elastic modelling quantity of ceramic-metallic high rigidity and superior alloy steel.Parts with frication pair in automobile engine uses can wear and tear with in-situ immobilization, Optimization gap, recovers accessory size, extends 2 life of electromotor and uses the cycle, reduces maintenance cost
Of the present invention at metal friction and wear surface preparation generating protective layer and preparation method thereof; its employing of the present invention makees carrier with lubricant; pharmaceutical formulation containing specific repair is sent into the CONTACT WITH FRICTION district of piece surface; driven by the frictional heat of preparation and surface of friction pair and generation and participate in repairing power chemistry (tribochemistry) occurred between the 3rd body such as wear particle and react; surface of friction pair is made to obtain home position alloying strengthening so that it is to possess ceramic-metallic high rigidity and superior alloy steel characteristic.
The above is only the better embodiment of the present invention, therefore all equivalence changes done according to structure, feature and the principle described in present patent application scope or modification, in the range of being all included in present patent application.
Claims (5)
1. generate preparation of protective layer and preparation method thereof at metal friction with wear surface, it is characterised in that:
It adopts the following technical scheme that:
Its formula composition is as follows:
Stratiform hydroxy silicate powder: 80-99；
Surface modifier: 45-50；
Carbonized graphite catalyst: 4-6；
Its preparation method following method step of employing:
1) by above-mentioned weight proportion by subtraction example, native hydroxyl magnesium silicate ore powder is ground to form with surface modifier
Nanometer is to the oil-soluble composite granule of micron dimension；
2) in step 1) in oil-soluble composite granule add carbonized graphite catalyst continue grind formed
Uniform combination powder；
3) by step 2) in uniform combination powder, the ratio of 0.1-5% in mass ratio be mixed into basis profit
In lubrication prescription, make concentrating agents；
4) by step 3) in the concentrating agents for preparing, directly in concentrating agents: lubricant=1: the ratio of 9 addition
Use in lubricant.
The most according to claim 1 metal friction and wear surface generate protective layer preparation and
Preparation method, it is characterised in that: its formula composition is as follows: stratiform hydroxy silicate powder: 80
-99；Surface modifier: 15-20；Carbonized graphite catalyst: 1-3.
The most according to claim 1 metal friction and wear surface generate protective layer preparation and
Preparation method, it is characterised in that: its formula composition is as follows: stratiform hydroxy silicate powder:
80-99；Surface modifier: 11-12；Carbonized graphite catalyst: 1.5-6.
The most according to claim 1 metal friction and wear surface generate protective layer preparation and
Preparation method, it is characterised in that: layered hydroxy silicate powder is hydroxyl magnesium silicate mineral powder.
5. according to the preparation at metal friction with wear surface generation protective layer described in claim 1 or 4
And preparation method thereof, it is characterised in that: described hydroxyl magnesium silicate mineral powder refers to serpentine, Talcum, sea
The combination of one or more in afrodite, Actinolitum mineral powder.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055927A (en) * | 2018-10-11 | 2018-12-21 | 燕山大学 | The preparation method and applications of the corrosion-resistant graphite ene coatings of high abrasion |
| CN110305714A (en) * | 2019-06-26 | 2019-10-08 | 北京交通大学 | Nano hydroxyl magnesium silicate-Fluorin doped agraphitic carbon antiwear composite agent preparation method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5996295A (en) * | 1982-11-26 | 1984-06-02 | Riken Corp | Wear resistant sliding parts |
| CN1858294A (en) * | 2006-04-20 | 2006-11-08 | 金元生 | Preparation for forming protective layer on metal friction and wear-out surface and its preparing method |
| CN201133418Y (en) * | 2007-12-26 | 2008-10-15 | 石家庄金刚内燃机零部件集团有限公司 | Shaft bushing |
-
2015
- 2015-04-22 CN CN201510193482.1A patent/CN106148885A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5996295A (en) * | 1982-11-26 | 1984-06-02 | Riken Corp | Wear resistant sliding parts |
| CN1858294A (en) * | 2006-04-20 | 2006-11-08 | 金元生 | Preparation for forming protective layer on metal friction and wear-out surface and its preparing method |
| CN201133418Y (en) * | 2007-12-26 | 2008-10-15 | 石家庄金刚内燃机零部件集团有限公司 | Shaft bushing |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055927A (en) * | 2018-10-11 | 2018-12-21 | 燕山大学 | The preparation method and applications of the corrosion-resistant graphite ene coatings of high abrasion |
| CN109055927B (en) * | 2018-10-11 | 2019-10-11 | 燕山大学 | The preparation method and applications of the corrosion-resistant graphite ene coatings of high abrasion |
| CN110305714A (en) * | 2019-06-26 | 2019-10-08 | 北京交通大学 | Nano hydroxyl magnesium silicate-Fluorin doped agraphitic carbon antiwear composite agent preparation method |
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Application publication date: 20161123 |