CN103551971A - Ceramic binding agent for ceramic grinding block and preparation method thereof - Google Patents
Ceramic binding agent for ceramic grinding block and preparation method thereof Download PDFInfo
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- CN103551971A CN103551971A CN201310514950.1A CN201310514950A CN103551971A CN 103551971 A CN103551971 A CN 103551971A CN 201310514950 A CN201310514950 A CN 201310514950A CN 103551971 A CN103551971 A CN 103551971A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 39
- 238000000227 grinding Methods 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000011230 binding agent Substances 0.000 title abstract 5
- 239000000843 powder Substances 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims description 18
- 239000007767 bonding agent Substances 0.000 claims description 17
- 238000002844 melting Methods 0.000 claims description 15
- 230000008018 melting Effects 0.000 claims description 12
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 10
- 238000000498 ball milling Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 235000012054 meals Nutrition 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000013467 fragmentation Methods 0.000 claims description 3
- 238000006062 fragmentation reaction Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000009461 vacuum packaging Methods 0.000 claims description 3
- 239000010432 diamond Substances 0.000 abstract description 24
- 229910003460 diamond Inorganic materials 0.000 abstract description 24
- 229910010271 silicon carbide Inorganic materials 0.000 abstract description 10
- 238000005245 sintering Methods 0.000 abstract description 9
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 abstract 1
- 239000004327 boric acid Substances 0.000 abstract 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 abstract 1
- 229910052808 lithium carbonate Inorganic materials 0.000 abstract 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 abstract 1
- 238000004663 powder metallurgy Methods 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract 1
- 239000004408 titanium dioxide Substances 0.000 abstract 1
- 239000011787 zinc oxide Substances 0.000 abstract 1
- 229910001928 zirconium oxide Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 description 4
- 239000010431 corundum Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910001573 adamantine Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 2
- ORILYTVJVMAKLC-UHFFFAOYSA-N adamantane Chemical compound C1C(C2)CC3CC1CC2C3 ORILYTVJVMAKLC-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- Ceramic Products (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a ceramic binding agent for a ceramic grinding block and a preparation method thereof and belongs to the technical field of powder metallurgy materials. The ceramic binding agent aims at achieving the effects that the retention to diamond is good, the expansion coefficient is matched with expansion coefficients of silicon carbide, brown aluminum oxide and the diamond, and the sintering temperature of a finished product is low. The ceramic binding agent is formed by the following powder materials of, by weight, 20 to 55 kilograms of silicon dioxide, 5 to 25 kilograms of aluminum oxide, 0 to 5 kilograms of zinc oxide, 0 to 5 kilograms of titanium dioxide, 0 to 7 kilograms of zirconium oxide, 10 to 20 kilograms of sodium carbonate, 5 to 15 kilograms of lithium carbonate and 8 to 30 kilograms of boric acid. According to the ceramic binding agent for the ceramic grinding block, the ceramic grinding block has the advantages of being low in sintering temperature, good in self-sharpening, good in sharpness, long in service life, low in carbon and environmentally friendly.
Description
Technical field
The present invention relates to bonding agent and preparation method for a kind of abrading block, bonding agent and the preparation method of the ceramic abrading block using especially for the fine grinding operation of wall and floor ceramic tile processing, belong to powdered metallurgical material technical field.
Background technology
Ceramic tile production line is the capital equipment in wall and floor ceramic tile industry, and current national ceramic production line has 3000 left and right, and wherein polish line just has more than 2000, and abrading block annual consumption is very large.The abrading block that ceramic polishing line is used is mainly divided into three kinds: metal abrading block, silicon carbide grinding block and magnesia abrading block, be respectively used to corase grind, middle fine grinding and polishing.Wherein, middle fine grinding is maximum with silicon carbide grinding block consumption, but silicon carbide grinding block exists the shortcomings such as grinding efficiency is low, the life-span is short, and this not only causes polishing process cost relatively high, and production environment is also produced to great pollution.
Pottery abrading block (being ceramic base diamond grinding block) is a kind of abrading block of new rise, the primary raw material of pottery abrading block is carborundum, brown corundum, diamond, by adding appropriate bonding agent and additive, be prepared from, compare with other abrading blocks, have the following advantages: 1. grinding force is strong, grinding tool wearing and tearing are smaller, and during grinding, the shape retention of grinding tool is good, and the precision that grinds workpiece is high; 2. the heat producing during grinding is less, and grinding tool heats up lower, can adapt to the effect of various cooling fluids, has more pore in ceramic base diamond grinding block, is conducive to drain abrasive dust and heat radiation during grinding, is difficult for burn workpiece; 3. the self-sharpening of ceramic base diamond grinding block is relatively good, and finishing interlude is long, and finishing is than being easier to.
Therefore ceramic abrading block substitutes silicon carbide grinding block advantageous advantage, but also immature in industry by ceramic this technology of abrading block replacement silicon carbide grinding block.In the preparation process of ceramic abrading block, the quality of bonding agent quality directly affects the performance of ceramic abrading block, vitrified bond must possess following performance: intensity is high, there is higher heat resistance, there is suitable hardness, grinding consumes little, grinding efficiency is high, and it is high that the surface of the work precision processing is wanted, and filler must be economical.Thereby the preparation of vitrified bond is the key technology that ceramic base diamond grinding block is made.
Summary of the invention
The technical issues that need to address of the present invention are to provide vitrified bond and the preparation method of ceramic abrading block for a kind of wall and floor ceramic tile polish line, to improve the confining force of bonding agent to diamond grinding block, improve the thermal coefficient of expansion of vitrified bond, reduce the sintering temperature of ceramic module finished product.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A diamond grinding block vitrified bond, described vitrified bond is made into by the powder stock of following weight unit's:
SiO
2?20～55，Al
2O
3?5～25，ZnO?0～5，TiO
2?0～5，ZrO?0～7，Na
2CO
3?10～20，Li
2CO
3?5～15，H
3BO
3?8～30。
Further improvement of the present invention is: described vitrified bond is made into by the powder stock of following weight unit's:
SiO
2?25～52，Al
2O
3?5～23，ZnO?0～4，TiO
2?0～3，ZrO?0～5，Na
2CO
3?11～17，Li
2CO
3?5～13，H
3BO
3?8～28。
Further improvement of the present invention is: described vitrified bond is made into by the powder stock of following weight unit's:
SiO
2?45，Al
2O
3?20，ZnO?1，TiO
2?1，ZrO?2，Na
2CO
3?15，Li
2CO
3?7，H
3BO
3?9。
The invention still further relates to the preparation method of vitrified bond for a kind of ceramic base diamond grinding block, comprise the steps:
A. compounding raw material: take each raw material by proportioning, drop in batch mixer and mix 2～3 hours;
B. powder melting: pour the raw material mixing in glass-melting furnace melting, 1300 ~ 1500 ℃ of smelting temperatures, smelting time 1 ~ 2 hour, is glass metal by the raw material melting mixing;
C. solution cold quenching: the glass metal after melting is poured in cold water fast, carries out quick cooling formation coarse fodder, wherein cold water temperature is 10 ~ 25 ℃, and be 30 ~ 60s cool time;
D. coarse fodder is broken: pour the coarse fodder obtaining in step c in disintegrating machine fragmentation, excessively after 30 mesh sieves, obtain meal;
E. fine grinding powder: pour in ball mill the meal obtaining in steps d into ball milling 1.5 ~ 2.5 hours, add suitable quantity of water during ball milling, wear into slurry;
F. sieve: the slurry after ball milling in step e is crossed to 320 mesh sieves, obtain screened stock material;
G. dry: the screened stock material sieving in step f is put into drying in oven and process 2 ~ 3 hours, obtain powder;
H. sieve for two times: the powder of oven dry is sent into ultrasonic vibration sieve and carry out secondary and sieve, can obtain bonding agent powder;
I. pack: vacuum packaging is carried out in the bonding agent powder pack after step h is sieved, and obtains bonding agent finished product.
Owing to having adopted technique scheme, the obtained technological progress of the present invention is:
The vitrified bond that the present invention is made is for the making of ceramic abrading block, good to adamantine hold to reach vitrified bond, and carborundum, brown corundum, diamond three coefficient of expansion coupling, the low texts of finished product sintering temperature.Make ceramic abrading block there is the advantages such as sintering temperature is low, self-sharpening good, sharpness is good, the life-span is long, low-carbon environment-friendly.
Ceramic bond agent prescription of the present invention, can improve bistrique service life and sintering character, assurance forms good mechanical engagement to wrapped up diamond, and can be under lower sintering temperature, reach effective sintering in shorter sintering time, slow down the degradation trend of diamond single crystal, its ceramic constituent element can be good infiltration abrasive material, improve adamantine bonding streng.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is described in further details.
A diamond grinding block vitrified bond, the raw material of described bonding agent is made into by the powder stock of following weight unit's: SiO
220～55, Al
2o
35～25, ZnO 0～5, TiO
20～5, ZrO 0～7, Na
2cO
310～20, Li
2cO
35～15, H
3bO
38～30.
Vitrified bond of the present invention be preferably: SiO
225～52, Al
2o
35～23, ZnO 0～4, TiO
20～3, ZrO 0～5, Na
2cO
311～17, Li
2cO
35～13, H
3bO
38～28.
SiO more preferably
245, Al
2o
320, ZnO 1, TiO
21, ZrO 2, Na
2cO
315, Li
2cO
37, H
3bO
39.
The vitrified bond that adopts above-mentioned raw materials to prepare, the parameter of evaluating its performance mainly contains: the holding force coefficient in thermal coefficient of expansion and ceramic abrading block between ceramic matrix and diamond.
Wherein: thermal coefficient of expansion limits according to diamond thermal coefficient of expansion, carborundum thermal coefficient of expansion and brown corundum thermal coefficient of expansion, when diamond thermal coefficient of expansion is 1.2 ~ 4.5 * 10
-6/ ℃, carborundum thermal coefficient of expansion is 4 ~ 6 * 10
-6/ ℃, brown corundum thermal coefficient of expansion is 7 ~ 10 * 10
-6/ ℃ time, for making bonding agent firmly control abrasive material, the thermal coefficient of expansion of bonding agent should be chosen in 4 ~ 7 * 10
-6/ ℃ proper.
Introduce the thermal coefficient of expansion that relative density correction model (Turner model) carrys out Accurate Prediction ceramic material.
In formula:
α
1the thermal coefficient of expansion of-each phase (℃
-1)
P
1the mass fraction of-each phase (wt%)
K
1the bulk modulus of-each phase (Pa)
D
1the density of-each phase (g cm
-3)
Hold between ceramic matrix and diamond characterizes: in Diamond Tools Industry, conventional following formula characterizes the size of carcass to diamond hold.
Q=（σ
1-σ
2）/σ
1
F=1-Q
The relative value that Q wherein---bending strength declines,
σ
1---the bending strength of carcass,
σ
2---containing the bending strength of diamond sample,
F---diamond holding force coefficient, the larger expression carcass of F value is higher to adamantine hold.
The raw material proportioning embodiment of several concrete vitrified bonds is below provided.But raw material of the present invention can also be expanded on the basis of following examples, obtains the formula of other ratio.
Embodiment 1
The preparation method of vitrified bond for pottery abrading block, comprises the steps:
A. compounding raw material: take each raw material, SiO by following unit of weight (in kilogram) proportioning
245Kg, Al
2o
317 Kg, ZnO 1 Kg, TiO
21 Kg, ZrO 2 Kg, Na
2cO
312 Kg, Li
2cO
39 Kg, H
3bO
313 Kg, drop in batch mixer and mix 2 hours;
B. powder melting: pour the raw material mixing in glass-melting furnace melting, 1350 ℃ of smelting temperatures, smelting time 1.5 hours, is glass metal by the raw material melting mixing;
C. solution cold quenching: the glass metal after melting is poured in cold water fast, carries out quick cooling formation coarse fodder, wherein cold water temperature is 20 ℃, and be 30s cool time;
D. coarse fodder is broken: pour the coarse fodder obtaining in step c in disintegrating machine fragmentation, excessively after 30 mesh sieves, obtain meal;
E. fine grinding powder: pour in ball mill the meal obtaining in steps d into ball milling 2 hours, add suitable quantity of water during ball milling, wear into slurry;
F. sieve: the slurry after ball milling in step e is crossed to 320 mesh sieves, obtain screened stock material;
G. dry: the screened stock material sieving in step f is put into drying in oven and process 2 hours, obtain powder;
H. sieve for two times: the powder of oven dry was sent into ultrasonic vibration sieve and carry out secondary and sieve, and can obtain bonding agent powder;
I. pack: vacuum packaging is carried out in the bonding agent powder pack after step h is sieved, and obtains bonding agent finished product.
The thermal coefficient of expansion of gained vitrified bond is 5.7 * 10
-6/ ℃, diamond holding force coefficient is 85%.
The concrete steps of embodiment 2 ~ 9 are with reference to shown in embodiment 1, and raw material proportioning, preparation process parameter and properties of product correspondence are listed in table one.
Table one embodiment 2 ~ 9 Raw proportionings, preparation process parameter and properties of product
By table one, can be found out that the vitrified bond that Ceramic bond agent prescription of the present invention is prepared all has good thermal coefficient of expansion and larger diamond holding force coefficient.
Claims (4)
1. a ceramic abrading block vitrified bond, is characterized in that: described vitrified bond is made into by the powder stock of following weight unit's:
SiO
2?20～55，Al
2O
3?5～25，ZnO?0～5，TiO
2?0～5，ZrO?0～7，Na
2CO
3?10～20，Li
2CO
3?5～15，H
3BO
3?8～30。
2. ceramic abrading block vitrified bond according to claim 1, is characterized in that: described vitrified bond is made into by the powder stock of following weight unit's:
SiO
2?25～52，Al
2O
3?5～23，ZnO?0～4，TiO
2?0～3，ZrO?0～5，Na
2CO
3?11～17，Li
2CO
3?5～13，H
3BO
3?8～28。
3. ceramic abrading block vitrified bond according to claim 2, is characterized in that: described vitrified bond is made into by the powder stock of following weight unit's:
SiO
2?45，Al
2O
3?20，ZnO?1，TiO
2?1，ZrO?2，Na
2CO
3?15，Li
2CO
3?7，H
3BO
3?9。
4. the preparation method of vitrified bond for the ceramic abrading block described in claim 1～3 any one, is characterized in that comprising the steps:
A. compounding raw material: take each raw material by proportioning, drop in batch mixer and mix 2～3 hours;
B. powder melting: pour the raw material mixing in glass-melting furnace melting, 1300 ~ 1500 ℃ of smelting temperatures, smelting time 1 ~ 2 hour, is glass metal by the raw material melting mixing;
C. solution cold quenching: the glass metal after melting is poured in cold water fast, carries out quick cooling formation coarse fodder, wherein cold water temperature is 10 ~ 25 ℃, and be 30 ~ 60 s cool time;
D. coarse fodder is broken: pour the coarse fodder obtaining in step c in disintegrating machine fragmentation, excessively after 30 mesh sieves, obtain meal;
E. fine grinding powder: pour in ball mill the meal obtaining in steps d into ball milling 1.5 ~ 2.5 hours, add suitable quantity of water during ball milling, wear into slurry;
F. sieve: the slurry after ball milling in step e is crossed to 320 mesh sieves, obtain screened stock material;
G. dry: the screened stock material sieving in step f is put into drying in oven and process 2 ~ 3 hours, obtain powder;
H. sieve for two times: the powder of oven dry is sent into ultrasonic vibration sieve and carry out secondary and sieve, can obtain bonding agent powder;
I. pack: vacuum packaging is carried out in the bonding agent powder pack after step h is sieved, and obtains bonding agent finished product.
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|---|---|---|---|
| CN201310514950.1A CN103551971B (en) | 2013-10-28 | 2013-10-28 | Pottery abrading block vitrified bond |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310514950.1A CN103551971B (en) | 2013-10-28 | 2013-10-28 | Pottery abrading block vitrified bond |
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|---|---|
| CN103551971A true CN103551971A (en) | 2014-02-05 |
| CN103551971B CN103551971B (en) | 2016-04-20 |
Family
ID=50006408
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| CN105196200A (en) * | 2015-09-14 | 2015-12-30 | 黄山安卡重负荷砂轮有限公司 | Rare earth ceramic bonding agent and manufacturing method of grinding wheel by using bonding agent |
| CN105563363A (en) * | 2014-11-05 | 2016-05-11 | 江苏华东砂轮有限公司 | Method for preparing ceramic bond stacking abrasive material through centrifugal drying granulation technology |
| CN105666347A (en) * | 2016-04-13 | 2016-06-15 | 郑州宏基研磨科技有限公司 | Ceramic stacked abrasive material, method for preparing same, and grinding tool |
| CN105965406A (en) * | 2016-05-25 | 2016-09-28 | 安徽砥钻砂轮有限公司 | Nano ceramic-modified silane resin grinding wheel and preparation method thereof |
| CN106041759A (en) * | 2016-06-06 | 2016-10-26 | 郑州磨料磨具磨削研究所有限公司 | Additive raw material composite and additive for superhard material product, preparation method of additive, combined binder and superhard material product |
| CN106475918A (en) * | 2016-10-18 | 2017-03-08 | 郑州磨料磨具磨削研究所有限公司 | A kind of vitrified bond and preparation method thereof, emery wheel |
| CN106553135A (en) * | 2016-10-27 | 2017-04-05 | 郑州磨料磨具磨削研究所有限公司 | A kind of bonding agent, preparation method and emery wheel |
| CN107234551A (en) * | 2017-06-30 | 2017-10-10 | 福建瑞祺新材料有限公司 | A kind of high-temperature-resistant high cube nitrification borax wheel ceramic combination agent and preparation method thereof |
| CN107445603A (en) * | 2017-07-13 | 2017-12-08 | 河南建筑材料研究设计院有限责任公司 | A kind of enviroment protective ceramic bonding agent |
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| CN112296889A (en) * | 2020-11-06 | 2021-02-02 | 河南科恩超硬材料技术有限公司 | Thinned porous ceramic composite bonding agent for SIC wafer, diamond tool bit, grinding wheel and manufacturing method of grinding wheel |
| CN112621579A (en) * | 2020-11-19 | 2021-04-09 | 广东奔朗新材料股份有限公司 | Grinding wheel and manufacturing method thereof |
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