CN110509193A - A kind of universal joint alley mill preparation method of nano-grade ceramic binding agent - Google Patents
A kind of universal joint alley mill preparation method of nano-grade ceramic binding agent Download PDFInfo
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- CN110509193A CN110509193A CN201910945893.XA CN201910945893A CN110509193A CN 110509193 A CN110509193 A CN 110509193A CN 201910945893 A CN201910945893 A CN 201910945893A CN 110509193 A CN110509193 A CN 110509193A
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- grade ceramic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/14—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The present invention provides a kind of preparation method of universal joint alley mill nano-grade ceramic binding agent.The nano-grade ceramic binding agent is by SiO2、V2O5、Na2O、Al2O3、K2O composition, adds 5%~8% nanometer of ZrO2.The grinding wheel of nano-grade ceramic binding agent provided by the invention preparation, bonding agent used and general vitrified bond the difference is that, with rare metal oxide V2O5Substitute common B2O3, while adding a nanometer ZrO2, the effect of bonding agent wetting ability can be improved using rare metal oxide, improve the intensity and hardness of grinding wheel, grinding wheel is set to guarantee higher sharpness simultaneously, with better shape retention, to promote grinding speed and currying work every greatly promoting grinding efficiency and grinding wheel service life.
Description
The invention belongs to entitled a kind of universal joint alley mill nano-grade ceramic binding agent cBN grinding wheel and its preparation sides
Method, the applying date are on May 27th, 2017, application No. is the divisional applications of 2017103937293 patent applications, belong to product preparation
Method part.
Technical field
The invention belongs to superhard abrasive material grinding tool technical field, it is related to a kind of universal joint alley mill nano-grade ceramic binding agent
Preparation method.
Background technique
Ceramic cBN grinding wheel is by vitrified bond and cBN abrasive material by high temperature sintering, and a kind of porosity of formation is high, strong
Spend high porous wear-resistant material.Compared with conventional abrasive material, the cBN abrasive material advantage that not only hardness is high, thermal conductivity is high, wearability is good,
Heat, chemical stability are strong simultaneously, therefore cBN abrasive grinding wheel is increasingly becoming high speed, the first choice of high-precision grinding.
When universal joint alley grinding, since grinding allowance is big, grinding speed is fast, and each alley is once to be ground to
Position, therefore to the serious wear of grinding wheel, it has higher requirements to grinding wheel sharpness and shape retention.Country's grinding wheel is due to strong at present
Degree problem causes the shape retention of grinding wheel poor, 1 is divided between amendment, seriously affects the service life of grinding efficiency and grinding wheel.
Summary of the invention
For prior art shortcoming, the invention discloses a kind of universal joint alley mill nano-grade ceramic binding agent cBN
Grinding wheel and preparation method thereof improves bonding agent wetability and nanometer by rare metal oxide using new vitrified bond
The toughening effect of composite material, by with V2O5Substitute common B2O3And nanometer ZrO is added in vitrified bond2, keep sand
While taking turns sharpness, wheel strength is improved, to improve grinding speed and amendment interval, greatly improves grinding efficiency and use
Service life.
In order to achieve the above objectives, the present invention provides technical solution below:
A kind of universal joint alley mill nano-grade ceramic binding agent, contains basic bonding agent and nanometer ZrO2；The nanometer
ZrO2Dosage be the 5%~8% of basic bonding agent；The basis bonding agent includes SiO2、Al2O3、K2O、Na2O。
In above-mentioned technical proposal, the nanometer ZrO2Partial size be 30~50 nm；The basis bonding agent further includes V2O5。
The present invention limits ZrO2Granularity, so that ZrO2It is controlled with the reaction process of high temperature solution, avoids finally destroying bonding agent knot
The uniformity of structure and performance.
In above-mentioned technical proposal, the weight percent group of the basis bonding agent becomes, SiO245~60%, V2O520~
30%、Al2O3 5~10%, Na2O 5~16%, K2O 5~10%.The present invention limits component proportion, is not only conducive between each component
Synthesis and ubiquit, and the vitrified bond itself prepared has the characteristics that hardness height, great thermotolerance, self-sharpening are good, sharp, therefore,
The frequent service life and processing efficiency replaced freeing wheel and greatly improve freeing wheel can not be had to.
The invention also discloses a kind of preparation methods of universal joint alley mill nano-grade ceramic binding agent, by basic bonding agent
With nanometer ZrO2It is uniformly mixed, is then heated to 1500 DEG C, then quick water cooling, then ball milling 3~5 hours, then dry, mistake
Sieve selects 600 mesh to the powder between 800 mesh, obtains the nano-grade ceramic binding agent；The nanometer ZrO2Dosage based on tie
The 5%~8% of mixture；The basis bonding agent includes SiO2、Al2O3、K2O、Na2O、V2O5。
The invention also discloses a kind of universal joint alley mill nano-grade ceramic binding agent cBN grinding wheels, by matrix and abrasive material
Composition；The abrasive material includes above-mentioned nano-grade ceramic binding agent.
In above-mentioned technical proposal, the weight percent group of the abrasive material becomes, cBN abrasive material 40~60%, Al2O3Abrasive material 20
~30%, nano-grade ceramic binding agent 15~30%, pore creating material 1~5%, temporary binders 5~10%.
In above-mentioned technical proposal, the cBN abrasive size is 100~120 μm；The Al2O3Abrasive size is 70~90
μm；The partial size of the pore creating material is 50~70 μm；The temporary binders are epoxy resin.
In the vitrified bond of the method for the present invention preparation, silica is mainly that vitrified bond is provided by oxygen-octahedron
The body frame structure of composition；Vanadic anhydride, potassium oxide are as Nucleating Agent；Due in basic material be added sodium oxide molybdena and it is subsequent plus
Enter zirconium oxide, increases the specific surface area of integrated powder, i.e. apparent activation energy, so that the sintering temperature of vitrified bond is reduced,
That is refractoriness, and enhance the intensity of the vitrified bond, overcome the prior art also to improve while increasing vitrified bond intensity
The problem of vitrified bond refractoriness；The present invention can be dropped by the ratio of silica, aluminium oxide, zirconium oxide, potassium oxide
The thermal expansion coefficient of low vitrified bond, so that the thermal expansion coefficient for reaching sintered vitrified bond and abrasive material matches；
The present invention prepares in grinding wheel that each component ratio is reasonable, is conducive to be sufficiently mixed uniformly, in the sintered of manufacture grinding tool from now on
It can fully participate in reacting in journey, improve the uniformity of each position vitrified bond reaction of grinding tool.
The present invention further discloses a kind of preparation methods of universal joint alley mill nano-grade ceramic binding agent cBN grinding wheel, including
Following steps:
(1) by basic bonding agent and nanometer ZrO2It is uniformly mixed, is then heated to 1500 DEG C, then quick water cooling, then ball milling 3~
5 hours, then dry, sieving selected 600 mesh to the powder between 800 mesh, obtains nano-grade ceramic binding agent；
(2) abrasive material, nano-grade ceramic binding agent, pore creating material, temporary adhesive are uniformly mixed, then dry, crosses 120 targets standard
Sieve, obtains mixture；The abrasive material contains cBN；
(3) mixture is dry-pressing formed, obtain green compact；The green compact obtain abrasive material through Overheating Treatment；
(4) by abrasive material in conjunction with matrix, universal joint alley mill nano-grade ceramic binding agent cBN grinding wheel is obtained.
In above-mentioned technical proposal, the weight percent group of the basis bonding agent becomes, SiO245~60%, V2O520~
30%、Al2O3 5~10%, Na2O 5~16%, K2O 5~10%；The weight percent group of the mixture becomes, cBN abrasive material 40
~60%, Al2O3Abrasive material 20~30%, nano-grade ceramic binding agent 15~30%, pore creating material 1~5%, temporary binders 5~10%.
In above-mentioned technical proposal, the nanometer ZrO2Partial size be 30~50 nm；The cBN abrasive size be 100~
120 μm；The Al2O3Abrasive size is 70~90 μm；The partial size of the pore creating material is 50~70 μm；The temporary binders
For epoxy resin.The preferred alumina hollow ball of pore creating material.
In above-mentioned technical proposal, in step (2), it is uniformly mixed and carries out in the presence of an organic；In step (3), dry-pressing
Molding pressure is 10MPa, and temperature is room temperature.Heat treatment was warming up to 350 DEG C for 3 hours, kept the temperature 2 hours, then be warming up to for 3 hours
850 DEG C, 2 hours are kept the temperature, last natural cooling；In step (4), with epoxide-resin glue by abrasive material in conjunction with matrix.The technique
Feature strong operability, stability is good, conducive to production structure and vitrified bonded grinding wheel stable and reliable for performance.
Vitrified bond of the invention contains rare metal oxide V2O5Glass system SiO2-V2O5-Al2O3；And add
Add the zirconium oxide of limited amount, while keeping grinding wheel sharpness, improve wheel strength, to improve between grinding speed and amendment
Every greatly improving grinding efficiency and service life.
Such as the universal joint alley mill disclosed by the invention preparation method of nano-grade ceramic binding agent cBN grinding wheel, specifically may be used
With the following steps are included:
(1) by SiO2、V2O5、Al2O3、Na2O、K2O and ZrO2By weight being uniformly mixed, 1500 DEG C are heated in Cinker clew furnace,
Quick water cooling, ball milling 3~5 hours, dry, sieving selects 600 mesh to the powder between 800 mesh, and gained is required Ceramic bond
Agent；
(2) cBN abrasive material, Al are weighed by weight2O3Acetone stirring is added in abrasive material bonding agent, alumina hollow ball, epoxy resin
To being uniformly mixed, mixture is crossed 120 mesh standard sieves by drying；
(3) mixture is put into mold after being sieved, it is dry-pressing formed, obtain green compact；
(4) it puts the green body into electric furnace, is warming up within 3 hours 350 DEG C, keep the temperature 2 hours, then be warming up within 3 hours 850 DEG C, heat preservation 2 is small
When, last furnace cooling obtains abrasive material；
(5) with epoxide-resin glue that sintered abrasive material is Nian Jie with matrix, it is required according to size in lathe and grinding machine after solidification
Upper processing finally obtains nano-grade ceramic binding agent cBN grinding wheel.Vehicle Processing content is to process size qualification, precision according to drawing
The grinding wheel base body met the requirements；Grinding processing content includes grinding abrasive disk end face and outer circle.
The invention has the following advantages that
1. the present invention uses the glass system SiO containing rare metal oxide2-V2O5-Al2O3And addition nanometer ZrO2It is formed
New vitrified bond, obtained bonding agent intensity improves, good to the wetability of abrasive material, thus the grinding wheel shape retentivity of preparation
It is high；
2. vitrified bond disclosed by the invention composition is rationally, bonding agent sintering temperature is low, enables grinding wheel low-temperature sintering,
Protection abrasive material intensity is not affected by high temperatures, while reducing energy loss；
3. nano ceramics cBN grinding wheel prepared by the present invention, while keeping sharpness, intensity with higher makes grinding wheel exist
When mill processing universal joint alley, although grinding allowance is big, grinding wheel shape is still able to maintain constant, reaches grinding accuracy and wants
It asks, improves grinding efficiency and service life, achieve unexpected technical effect.
Specific embodiment
Below with reference to embodiment, the present invention will be further described:
Embodiment one
A kind of universal joint alley mill nano-grade ceramic binding agent cBN grinding wheel, including matrix and abrasive material.The ingredient of abrasive material is by weight
It is as follows to measure percentage: cBN abrasive material 50%, Al2O3Abrasive material 20%, vitrified bond 20%, alumina hollow ball 4%, epoxy resin 6%.
Matrix is base steel, and above-mentioned cBN abrasive size is 100~120 μm, Al2O3Abrasive size is 70~90 μm, oxidation
Aluminium hollow sphere partial size is 50~70 μm.Vitrified bond composition is SiO by weight percentage253%, V2O525%, Al2O3 7%,
Na2O 9%, K2O 6%, then add the nanometer ZrO that weight percent is 8%2, ZrO2Partial size be 30~50 nm.
The preparation flow of above-mentioned grinding wheel is as follows:
(1) by SiO2、V2O5、Al2O3、Na2O、K2O and ZrO2By weight being uniformly mixed, 1500 DEG C are heated in Cinker clew furnace,
Quick water cooling, ball milling 3~5 hours, dry, sieving selects 600 mesh to the powder between 800 mesh, and gained is required bonding agent；
(2) cBN abrasive material, bonding agent, carbon dust, epoxy resin are weighed by weight, and acetone is added and stirs to being uniformly mixed, dries,
Mixture is crossed into 120 mesh standard sieves；
(3) mixture is put into mold after being sieved, it is dry-pressing formed, obtain green compact；
(4) it puts the green body into electric furnace, is warming up within 3 hours 350 DEG C, keep the temperature 2 hours, then be warming up within 3 hours 850 DEG C, heat preservation 2 is small
When, last furnace cooling obtains abrasive material；
(5) with epoxide-resin glue that sintered abrasive material is Nian Jie with matrix, it is required according to size in lathe and grinding machine after solidification
Upper processing finally obtains nano-grade ceramic binding agent cBN grinding wheel.
When nano-grade ceramic binding agent cBN grinding wheel Material Processing of the invention is the universal joint alley of CF53, with existing market
Upper domestic grinding wheel (17.56*22.5*M8) is compared, under identical 600 mm/min grinding speed, amendment interval from 1/repair
Be promoted to 3/repair, 2 times of life-span upgrading.
When above-mentioned grinding wheel Material Processing is the universal joint clutch can of 20CrMnTi steel, with domestic grinding wheel currently on the market
(17.56*22.5*M8) is compared, and grinding speed is promoted to 600 mm/min, while 2 times of life-span upgrading from 500 mm/min.
The vitrified bonded grinding wheel of zirconium oxide preparation is not added, and compared with existing grinding wheel, grinding speed can reach 600 mm/
Min, but the service life can not improve；Without vanadic anhydride substitute boron oxide, can only at low 500 mm/min of grinding speed the service life
Improve 1 times.
Embodiment two
A kind of universal joint alley mill nano-grade ceramic binding agent cBN grinding wheel, including matrix and abrasive material.The ingredient of abrasive material is by weight
It is as follows to measure percentage: cBN abrasive material 47%, Al2O3Abrasive material 23%, bonding agent 22%, alumina hollow ball 2%, epoxy resin 6%.
Matrix is base steel, and above-mentioned cBN abrasive size is 100~120 μm, Al2O3Abrasive size is 70~90 μm, oxidation
Aluminium hollow sphere partial size is 50~70 μm.Vitrified bond composition is SiO by weight percentage253%, V2O525%, Al2O3 7%,
Na2O 9%, K2O 6%, the nanometer ZrO that addition weight percent is 6%2, ZrO2Partial size be 30~50 nm.
The technical process of grinding wheel preparation is the same as example 1.
Grinding wheel when the grinding wheel Material Processing prepared is the universal joint clutch can of CF53, with the country currently on the market
(17.56*22.5*M8) is compared: grinding speed is promoted to 550 mm/min from 450 mm/min, currying work every from one improve to
Two pieces, grinding wheel service life promote 2 times.
The vitrified bonded grinding wheel of zirconium oxide preparation is not added, and compared with existing grinding wheel, grinding speed can reach 550 mm/
Min, but the service life can not improve；Without vanadic anhydride substitute boron oxide, can only at low 450 mm/min of grinding speed the service life
Improve 1 times.
Embodiment three
A kind of universal joint alley mill nano-grade ceramic binding agent cBN grinding wheel, including matrix and abrasive material.The ingredient of abrasive material is by weight
It is as follows to measure percentage: cBN abrasive material 47%, Al2O3Abrasive material 23%, bonding agent 22%, alumina hollow ball 2%, epoxy resin 6%.
Matrix is base steel, and above-mentioned cBN abrasive size is 100~120 μm, Al2O3Abrasive size is 70~90 μm, oxidation
Aluminium hollow sphere partial size is 50~70 μm.Vitrified bond composition is SiO by weight percentage253%, V2O525%, Al2O3 7%,
Na2O 9%, K2O 6%, the nanometer ZrO that addition weight percent is 5%2, ZrO2Partial size be 30~50 nm.
The technical process of grinding wheel preparation is the same as example 1.
Grinding wheel when the grinding wheel Material Processing prepared is the universal joint clutch can of CF53, with the country currently on the market
(16.85*22.5*M8) is compared: grinding speed is promoted to 540 mm/min from 450 mm/min, currying work every from one improve to
Two pieces, grinding wheel service life promote 1.5 times.
The vitrified bonded grinding wheel of zirconium oxide preparation is not added, and compared with existing grinding wheel, grinding speed can reach 540 mm/
Min, but the service life can not improve；Without vanadic anhydride substitute boron oxide, can only at low 450 mm/min of grinding speed the service life
Improve 1 times.
Example IV
A kind of universal joint alley mill nano-grade ceramic binding agent cBN grinding wheel, including matrix and abrasive material.The ingredient of abrasive material is by weight
It is as follows to measure percentage: cBN abrasive material 47%, Al2O3Abrasive material 23%, bonding agent 22%, alumina hollow ball 2%, epoxy resin 6%.
Matrix is base steel, and above-mentioned cBN abrasive size is 100~120 μm, Al2O3Abrasive size is 70~90 μm, oxidation
Aluminium hollow sphere partial size is 50~70 μm.Vitrified bond composition is SiO by weight percentage248%, V2O528%, Al2O3 7%,
Na2O 12%, K2O 5%, the nanometer ZrO that addition weight percent is 6%2, ZrO2Partial size be 30~50 nm.
The technical process of grinding wheel preparation is the same as example 1.
Sand when the grinding wheel Material Processing prepared is the universal joint clutch can of 20CrMnTi steel, with the country currently on the market
Wheel (16.85*22.5*M8) is compared: grinding speed is promoted to 580 mm/min from 450 mm/min, and currying work is improved every from 1
To 4, grinding wheel service life promotes 2.5 times.
The vitrified bonded grinding wheel of zirconium oxide preparation is not added, and compared with existing grinding wheel, grinding speed can reach 580 mm/
Min, but the service life can not improve；Without vanadic anhydride substitute boron oxide, can only at low 450 mm/min of grinding speed the service life
Improve 1.5 times.
Embodiment five
A kind of universal joint alley mill nano-grade ceramic binding agent cBN grinding wheel, including matrix and abrasive material.The ingredient of abrasive material is by weight
It is as follows to measure percentage: cBN abrasive material 55%, Al2O3Abrasive material 24%, bonding agent 15%, alumina hollow ball 1%, epoxy resin 5%.
Matrix is base steel, and above-mentioned cBN abrasive size is 100~120 μm, Al2O3Abrasive size is 70~90 μm, oxidation
Aluminium hollow sphere partial size is 50~70 μm.Vitrified bond composition is SiO by weight percentage255%, V2O523%, Al2O3 7%,
Na2O 9%, K2O 6%, the nanometer ZrO that addition weight percent is 7%2, ZrO2Partial size be 30~50 nm.
The technical process of grinding wheel preparation is the same as example 1.
When nano-grade ceramic binding agent cBN grinding wheel Material Processing of the invention is the universal joint inner race of CF53, with current city
Domestic grinding wheel (17.56*22.5*M8) is compared on field, under identical 600 mm/min grinding speed, amendment interval from 1/
Repair be promoted to 4/repair, 3 times of life-span upgrading.When above-mentioned grinding wheel Material Processing is the universal joint inner race of 20CrMnTi steel, with mesh
Preceding domestic grinding wheel (17.56*22.5*M8) in the market is compared, and grinding speed is promoted to 620 mm/min from 500 mm/min, together
When 2 times of life-span upgrading.The grinding wheel for not adding zirconium oxide preparation, can only promote the service life under the low grinding speed of 500 mm/min；
Boron oxide is substituted without vanadic anhydride, the service life can not improve.
Claims (3)
1. the preparation method that a kind of universal joint alley mill uses nano-grade ceramic binding agent, which is characterized in that by basic bonding agent with receive
Rice ZrO2It is uniformly mixed, is then heated to 1500 DEG C, then quick water cooling, then ball milling 3~5 hours, then dry, sieving, choosing
600 mesh are selected to the powder between 800 mesh, obtain the nano-grade ceramic binding agent；The nanometer ZrO2Dosage be basic bonding agent
5%~8%；The basis bonding agent includes SiO2、Al2O3、K2O、Na2O、V2O5。
2. the universal joint alley mill preparation method of nano-grade ceramic binding agent according to claim 1, which is characterized in that described
Nanometer ZrO2Partial size be 30~50 nm.
3. the universal joint alley mill preparation method of nano-grade ceramic binding agent according to claim 1, which is characterized in that described
The weight percent group of basic bonding agent becomes, SiO245~60%, V2O520~30%, Al2O3 5~10%, Na2O 5~
16%、K2O 5~10%.
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| CN201910945893.XA CN110509193B (en) | 2017-05-27 | 2017-05-27 | Preparation method of nano ceramic bonding agent for universal joint ball track mill |
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| CN201910945893.XA CN110509193B (en) | 2017-05-27 | 2017-05-27 | Preparation method of nano ceramic bonding agent for universal joint ball track mill |
| CN201710393729.3A CN107042475B (en) | 2017-05-27 | 2017-05-27 | A kind of universal joint alley mill nano-grade ceramic binding agent cBN grinding wheel |
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| CN201910945892.5A Active CN110605671B (en) | 2017-05-27 | 2017-05-27 | Preparation method of nano ceramic bond cBN grinding wheel for universal joint ball track grinding |
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| CN112109004A (en) * | 2019-06-19 | 2020-12-22 | 衢州达宏砂轮制造有限公司 | Grinding wheel for grinding rubber shaft roller and manufacturing process thereof |
| CN112123221B (en) * | 2020-09-24 | 2022-02-11 | 苏州四砂致辅研磨材有限公司 | Silicon carbide grinding wheel binder and preparation method thereof |
| CN113511913B (en) * | 2021-04-27 | 2022-09-23 | 中国科学院兰州化学物理研究所 | Bionic fiber monolithic structure boron nitride high-temperature self-lubricating material and preparation method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107042475B (en) | 2019-11-05 |
| CN110605671A (en) | 2019-12-24 |
| CN107042475A (en) | 2017-08-15 |
| CN110605671B (en) | 2021-02-23 |
| CN110509193B (en) | 2020-11-06 |
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