AU2020102814A4 - Composite additive solution, method for improving compactness of bottom layer of grain oriented silicon steel, and grain oriented silicon steel sheet - Google Patents
Composite additive solution, method for improving compactness of bottom layer of grain oriented silicon steel, and grain oriented silicon steel sheet Download PDFInfo
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- AU2020102814A4 AU2020102814A4 AU2020102814A AU2020102814A AU2020102814A4 AU 2020102814 A4 AU2020102814 A4 AU 2020102814A4 AU 2020102814 A AU2020102814 A AU 2020102814A AU 2020102814 A AU2020102814 A AU 2020102814A AU 2020102814 A4 AU2020102814 A4 AU 2020102814A4
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- composite additive
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/46—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing oxalates
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical Treatment Of Metals (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
The disclosure provides a composite additive solution including 10-20 wt% ethanol, 5-10
wt% H3B03 , 1-3 wt% SrCl2-6H 20, 1-3 wt% cobalt source, 3-6 wt% antimony source,
and the rest is water. The bottom layer of magnesium silicate obtained is uniform and
shiny with high adhesion and good quality. The surface brightness is high and the color is
uniform and continuous. The adhesion is above grade B, basically reaching Grade A, with
good and stable magnetic properties.
Ethanol H3BO3 SrClr-6H20 Antimony Oxalate [Co(NH3) 6]Cl; CoSO 4 7H 20 Water
Example 1 10 10 1 6 0.5 0.5 72
Example 2 20 5 3 3 0.5 1 67
Example 3 14 7 2 4 1 1 71
Example 4 14 7 2 4 1.5 0.5 71
Example 5 14 7 2 4 0.5 1.5 71
Example 6 20 8 2 5 1 0.5 63
Example 7 16 8 3 3 1.5 1 67
Example 8 12 6 2 4 1 1.5 73
Comparative Example 1 14 3 2 4 1 1 75
Comparative Example 2 4 3 2 4 1 1 85
Comparative Example 3 14 7 6 4 1 1 67
Comparative Example 4 14 7 2 4 5 5 63
Comparative Example 5 14 7 5 8 1 1 64
Comparative Example 6 14 7 2 4 2 / 71
Comparative Example 7 14 7 2 4 / 2 71
Comparative Example 8 14 7 6 / 1 1 71
Comparative Example 9 14 7 / 6 1 1 71
Fig.1
Fig.2
1/3
Description
Ethanol H3BO3 SrClr-6H20 Antimony Oxalate [Co(NH3) 6 ]Cl; CoSO 4 7H 20 Water Example 1 10 10 1 6 0.5 0.5 72 Example 2 20 5 3 3 0.5 1 67 Example 3 14 7 2 4 1 1 71 Example 4 14 7 2 4 1.5 0.5 71 Example 5 14 7 2 4 0.5 1.5 71 Example 6 20 8 2 5 1 0.5 63 Example 7 16 8 3 3 1.5 1 67 Example 8 12 6 2 4 1 1.5 73 Comparative Example 1 14 3 2 4 1 1 75 Comparative Example 2 4 3 2 4 1 1 85 Comparative Example 3 14 7 6 4 1 1 67 Comparative Example 4 14 7 2 4 5 5 63 Comparative Example 5 14 7 5 8 1 1 64 Comparative Example 6 14 7 2 4 2 / 71 Comparative Example 7 14 7 2 4 / 2 71 Comparative Example 8 14 7 6 / 1 1 71 Comparative Example 9 14 7 / 6 1 1 71
Fig.1
Fig.2
1/3
[0001] The present disclosure relates to silicon steel, and more particularly relates to a composite additive solution, a method for improving compactness of bottom layer of grain oriented silicon steel, and grain oriented silicon steel sheet.
[00021 In order to manufacture grain oriented silicon steel products with excellent bottom layer of magnesium silicate glass film and magnetic properties, it is important to control the decarburization annealing and high temperature annealing process, the preparation and coating of magnesium oxide and its additives. Among them, magnesium oxide and its additives are the main film-forming substances that form the bottom layer of magnesium silicate glass film in the production of grain oriented silicon steel. The bottom layer of magnesium silicate glass film is an important part of the insulation coating of oriented silicon steel. In the actual production process, a sound and dense magnesium silicate bottom layer is the key to the excellent surface quality and performance of the finished oriented silicon steel. In the production process, pure water and TiO2, Mg(B0 2 ) 2 , Sb 2 (SO 4 ) 3 and other additives are stirred first, and then magnesium oxide is added to prepare a slurry, and then the slurry suspension is introduced into the coating machine to be coated on the surface of the strip and be dried, and then the strip is rolled and sent into a ring furnace for secondary high temperature annealing. Magnesium oxide can prevent steel coils from bonding during high-temperature annealing, and form a bottom layer of magnesium silicate to promote desulfurization and denitrogenation reactions.
[00031 However, current additive formulations still suffer from poor compactness and stability. There is an urgent need to develop an additive solution with good performance for improving compactness of bottom layer of grain oriented silicon steel.
[0004] The present disclosure provides a composite additive solution, a method for improving compactness of bottom layer of grain oriented silicon steel, and grain oriented silicon steel sheet.
[0005] In order to achieve the above-mentioned object, technical solutions of the
present disclosure are as follows:
[0006] A composite additive solution including 10-20 wt% ethanol, 5-10 wt% H3B0 3
, 1-3 wt% SrCl2-6H 20, 1-3 wt% cobalt source, 3-6 wt% antimony source, and the rest is
water.
[0007] Preferably, the cobalt source is a mixture of [Co(NH 3)]Cl3 and CoSO4-7H 20.
[0008] Preferably, the mass ratio of the [Co(NH 3)]Cl3 and CoSO4-7H 2 0 is 1-3:1-3.
[0009] Preferably, the mass ratio of the [Co(NH 3)]Cl 3and CoSO4-7H 20 is 1:1.
[0010] Preferably, the antimony source is antimony oxalate.
[0011] Preferably, the resistivity of the water is above 5x106.
[0012] A method for improving compactness of bottom layer of grain oriented silicon
steel, including the steps of:
mixing the composite additive solution, TiO 2 and water, stirring and dispersing
evenly;
adding magnesium oxide powder slowly under rapid stirring, to obtain a magnesium
oxide suspension, and controlling temperature of the magnesium oxide suspension below
°C to obtain a magnesium oxide coating solution;
applying the magnesium oxide coating solution to a surface of grain oriented silicon
steel which had been treated with decarburization annealing;
The mass ratio of the above magnesium oxide coating solution is: 100 parts by
weight of magnesium oxide, 1 to 5 parts by weight of TiO2, 3 to 30 parts by weight of
composite additive solution, and 800 to 1000 parts by weight of water.
[0013] Preferably, preparation method of the composite additive solution including:
first adding 50wt% water, 10-20wt% ethanol and 5-10wt% H3B0 3 and fully stirring until the H 3B03 is completely dissolved, and then slowly adding 1-3wt% SrCl2- 6H 20,
1-3wt% cobalt source, 3-6 wt% antimony source in sequence while maintaining rapid
stirring, completely dissolved after stirring, and finally adding the remaining water.
[0014] A grain oriented silicon steel sheet including a bottom layer of magnesium
silicate and an insulation coating formed on the surface of the bottom layer of magnesium
silicate, the bottom layer of magnesium silicate is obtained by coating the magnesium
oxide coating solution on an annealed oriented silicon steel sheet.
[0015] The ethanol of the present disclosure can increase the solubility of antimony
oxalate and [Co(NH 3)6 ]Cl 3, which enhances the reactivity of additive molecules,
improves the uniformity and stability of the dispersion of additive molecules on the
surface of magnesium oxide particles, and reduces the viscosity of magnesium oxide
slurry, thus improving the surface coating and stability of the steel sheet. The boric acid
of present disclosure is the compound with a low melting point which forms a liquid
phase state in the early stage as the furnace temperature rises, due to the increasing
contact area of solid phase reaction and diffusion rate, and reducing temperature for the
formation of magnesium silicate film. The antimony source of present disclosure is
antimony oxalate, which has good solubility, good compatibility with additive
components, and good dispensability in water. At the same time, the strontium chloride
selected in present disclosure has a large radius of Sr2 +, and good affinity with
magnesium ions. Combined with the large radius and low melting point of Sb, Sr2 and
Sb3 have large contact area with silicon oxide and other compound particles in the
microscopic state which are acted as active sites for high-temperature solid-phase
reaction, thus early initiating and accelerating reaction rate of solid-phase reaction for the
formation of magnesium silicate film. The chloride ions with high reaction activity can
make the silicon oxide more dense by reducing the FeO content on the surface of oriented
silicon steel. At the same time, the chloride ions can make less impurities for bottom layer of magnesium silicate formed during high temperature solid phase reaction. Co ions have high migration activity at high temperature, which can improve the toughness of the bottom layer of magnesium silicate, and the bottom layer has good adhesion and uniform gloss. Cobalt sulfate has good solubility and is decomposed into SO 3 at high temperature, which makes the film have some oxidation effects. As the temperature of the ring furnace rises, [Co(NH 3) 6 ]Cl3 gradually decomposes to release NH 3 gas, ensuring that an internal protective atmosphere is formed on the surface of the sheet before the solid phase reaction of the magnesium silicate film is formed, which is beneficial to the compactness and surface uniformity of the magnesium silicate film formation, and is conducive to the stability of the secondary recrystallization of the steel sheet and excellent surface and magnetic properties of the finished oriented silicon steel.
[0016] The present disclosure has the beneficial effects that:
[00171 1) The liquid composite additive solution is introduced to improve the
dispersion uniformity of the additive molecules on the surface of the magnesium oxide
particles and reduce the agglomeration of the magnesium oxide particles. The composite
additive solution with low melting point at high temperature can be formed as liquid
phase in advance which can increase the solid-phase surface contact area of magnesium
oxide with silicon oxide on the surface of oriented silicon steel, reduce the solid-phase
reaction temperature and accelerate the stable formation of bottom layer of magnesium
silicate with improving compactness.
[0018] 2) The composite additive solution of present disclosure has better
dispensability. Magnesium borate of the prior art is not highly soluble in water, and is not
easy to be uniformly dispersed during the solution preparation process. Antimony sulfate
is easy to absorb moisture and agglomerate, which is not conducive to on-site production
operations. The composite additive solution is an aqueous solution, which is completely miscible with water, and is easier to disperse evenly when mixed with magnesium oxide.
[0019] 3) The bottom layer of magnesium silicate obtained is uniform and shiny. The
bottom layer does not fall when is bent with high adhesion and good quality. The surface
brightness of the bottom layer is high and the color of the bottom layer is uniform and
continuous. The adhesion is above grade B, basically reaching Grade A (the comparative
examples are mainly Grade C), with good and stable magnetic properties.
[0020] Fig. 1 lists composite additive solution of different formulations in Examples 1 to 8 and Comparative Examples 1 to 9.
[0021] Fig. 2 lists a cross-sectional SEM image of the magnesium silicate bottom layer at 850°C.
[0022] Fig. 3 lists a cross-sectional SEM image of the magnesium silicate bottom layer at 900°C.
[0023] Fig. 4 lists a cross-sectional SEM image of the magnesium silicate bottom layer at 950°C.
[0024] Fig. 5 lists a cross-sectional SEM image of the magnesium silicate bottom layer at 1000°C.
[0025] Fig. 6 lists a cross-sectional SEM image of the magnesium silicate bottom layer at 1050°C.
[0026] Fig. 7 lists a cross-sectional SEM image of the magnesium silicate bottom layer at 1100°C.
[0027] Embodiments of the disclosure are described more fully hereinafter. The various embodiments of the invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0028] A composite additive solution is provided, which includes 10-20 wt% ethanol, -10 wt% H 3B03, 1-3 wt% SrC2-6H 20, 1-3 wt% cobalt source, 3-6 wt% antimony source, and the rest is water.
[0029] The cobalt source is a mixture of [Co(NH 3)]Cl3 and CoSO 4 -7H2 0. The mass
ratio of the [Co(NH 3)6 ]Cl3 and CoSO4-7H 2 0 is 1-3:1-3, preferably 1~1. The antimony
source is antimony oxalate. The resistivity of the water is above 5x106.
[0030] Figure 1 lists composite additive solutions of different formulations in Examples 1 to 8 and Comparative Examples 1 to 9.
[0031] Comparative example 10
[0032] This comparative example is approximately the same as Example 3, except that antimony oxalate is replaced with antimony sulfate.
[0033] Comparative example 11
[0034] This comparative example is approximately the same as Example 3, except that [Co(NH 3) 6 ]Cl3 is replaced with cobalt chloride.
[0035] A method for improving compactness of bottom layer of grain oriented silicon
steel is provided, including the steps of:
mixing the composite additive solution, TiO 2 and water, stirring and dispersing
evenly;
adding magnesium oxide powder slowly under rapid stirring, to obtain a magnesium
oxide suspension, and controlling temperature of the magnesium oxide suspension below
°C to obtain a magnesium oxide coating solution;
applying the magnesium oxide coating solution to a surface of grain oriented silicon
steel which had been treated with decarburization annealing. Among them, the
performance data of magnesium oxide is shown in Table 1.
[0036] Table 1 Item Value MgO (%) 98.50% CaO (%) 0.40
% Chemical Substances insoluble in hydrochloric acid (Si0 2 ) (%) 0.10
% composition chloride (Cl) (%) 0.010% sulfate (SO 4 ) (%) 0.200% ferric (Fe) (%) 0.030% Ig-loss (%) 0.8 ~ 1.00% Hydration rate (20°C/2hrs) (%) 2.00% Physical Citric acid value (30°C, C.A.A.) (sec) 70 80s properties Suspension (20°C/1hr) (mm/h) < 12 mm/h Viscosity (20°C) (c.P.) 50 ~ 70 c.P. Particle size distribution (D50) (pm) 3.0 ~ 4.0 pm
[0037] The prepared magnesium oxide coating solution is introduced into the
magnesium oxide circulation tank for use on the coating machine, and coated on the
oriented silicon steel which had been treated with decarburization annealing with
thickness of 0.23mm and dimension of 60mmx300mm, then dried to form a magnesium
oxide coating. The magnesium oxide coating are then subjected to secondary
recrystallization annealing at high temperature, coating of insulating coating solution, and
drying and curing of the insulation coating solution in sequence.
[0038] The preparation ratio of the above magnesium oxide coating solution is: 100
parts by weight of magnesium oxide, 3 parts by weight of TiO 2, 20 parts by weight of
composite additive solution, and 1000 parts by weight of water. The composite additive
solution is obtained according to example 1 to example 8 and comparative example 1 to
comparative example 11.
[0039] Table 2 shows the appearance and adhesion of magnesium silicate film
formed in each case in Fig. 1, and magnetic properties of the grain oriented silicon steel
sheets.
[0040] Table2 magnetic properties appearance Adhesion B8 W17/50 (T) (W/Kg)
Example 1 Uniformed, good compactness, B 1.90 0.80 slightly black surface Example 2 Uniformed and good, good A 1.92 0.79 consistency Example 3 Uniformed and shiny, good A 1.92 0.76 consistency and compactness Example 4 Uniformed and shiny, good A 1.91 0.78 consistency Example 5 Uniformed and shiny, with a A 1.92 0.77 little color difference Example 6 Uniformed and good, slightly A 1.91 0.80 black surface Example 7 Uniformed, thin film, lighter B 1.90 0.82 color surface Example 8 Uniformed and shiny, slightly A 1.92 0.81 black surface Comparative Rough surface with particles B 1.90 0.87 Example 1 aggregated Comparative Rough surface with color B 1.90 0.87 Example 2 difference Comparative C 1.89 0.88 Example Uneven surface, thin film
Comparative C 1.89 0.85 Example 4 Thin film, with metal spots
Comparative Uneven surface, thin film, D 1.90 0.91 Example 5 black surface Comparative Thin film, surface with color C 1.90 0.86 Example 6 difference Comparative Slightly black surface C 1.89 0.84 Example 7
Comparative D 1.89 0.92 Example 8 Thin film, whitish surface
Comparative Thin film, slightly black C 1.90 0.90 Example 9 surface Comparative C 1.89 0.88 Example10 Black surface
Comparative Light colored surface with C 1.89 0.89 Example 11 color difference
[0041] Figures 2 to 7 are the formation of bottom layer of magnesium silicate in
annealing stages at different high-temperature of oriented silicon steel test sheets coated
with a magnesium oxide coating solution containing the composite additive. As shown in
Figure 2 to Figure 7, it can be seen that at 900 degrees, the magnesium silicate bottom
layer of the oriented silicon steel test sheet has begun to form; by 1000 degrees, the
magnesium silicate bottom layer has good thickness and compactness. Since the initial
film formation temperature of the magnesium silicate bottom layer is low and the film
formation period is early, it has a better isolation effect on the substrate and provides a
favorable protective atmosphere for the stable growth of secondary crystal grains. And,
due to the uniform thickness and good compactness of the bottom layer with good
roughness between the bottom layer and substrate interface, the magnesium silicate
bottom layer is firmly bonded to the substrate, so that the surface quality and magnetic
properties of the oriented silicon steel product are improved.
[0042] It should be noted that the above description is only preferred embodiments of the present invention, and various modifications to these embodiments will be obvious to those skilled in the art. Therefore, the present invention will not be limited to these embodiments shown in the above. All equivalent changes and improvements made according to the scope of the present invention shall still fall within the scope of the patent of the present invention.
Claims (10)
1. A composite additive solution comprising 10-20 wt% ethanol, 5-10 wt% H3B0 3, 1-3
wt% SrCl 2 - 6H 20, 1-3 wt% cobalt source, 3-6 wt% antimony source, and the rest is water.
2. The composite additive solution according to claim 1, wherein the cobalt source is a
mixture of [Co(NH 3)6 ]Cl3 and CoSO 4 -7H2 0.
3. The composite additive solution according to claim 2, wherein the mass ratio of the
[Co(NH 3)6 ]Cl3 and CoSO4-7H 2 0 is 1-3:1-3.
4. The composite additive solution according to claim 1, wherein the mass ratio of the
[Co(NH 3) 6 ]Cl3 and CoSO4 -7H20 is 1:1.
5. The composite additive solution according to claim 1, wherein the antimony source
is antimony oxalate.
6. The composite additive solution according to claim 1, the resistivity of the water is 6 above 5x10
7. A method for improving compactness of bottom layer of grain oriented silicon steel,
comprising the steps of:
mixing the composite additive solution, TiO2 and water, stirring and dispersing
evenly;
adding magnesium oxide powder slowly under rapid stirring, to obtain a magnesium
oxide suspension, and controlling temperature of the magnesium oxide suspension below
°C to obtain a magnesium oxide coating solution;
applying the magnesium oxide coating solution to a surface of oriented silicon steel sheet with decarburization annealing; the magnesium oxide coating solution comprising: 100 parts by weight of magnesium oxide, 1 to 5 parts by weight of TiO 2, 3 to 30 parts by weight of composite additive solution as defined in claims from claim 1 to 6, and 800 to 1000 parts by weight of water.
8. The method according to claim 7, wherein preparation method of the composite
additive solution comprising: first adding 50wt% water, 10-20wt% ethanol and 5-1Owt%
H3B03 and fully stirring until the H 3B0 3 is completely dissolved, and then slowly adding
1-3wt% SrC2-6H 20, 1-3wt% cobalt source, 3-6 wt% antimony source in sequence while
maintaining rapid stirring, completely dissolved after stirring, and finally adding the
remaining water.
9. A magnesium oxide coating solution comprising 100 parts by weight of magnesium
oxide, 1 to 5 partsabyw eightofTi 2 ,3to30partsbyweight of composite additive
solution as defined in claims from claim 1 to 6, and 800 to 1000 parts by weight of water
10. A grain oriented silicon steel sheet comprising a bottom layer of magnesium
silicate and an insulation coating formed on surface of the bottom layer of magnesium
silicate, the bottom layer of magnesium silicate is obtained by coating the magnesium
oxide coating solution according to claim 9 on a surface of oriented silicon steel sheet
with decarburization annealing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010955929.5A CN112359350B (en) | 2020-09-11 | 2020-09-11 | Composite additive solution, method for improving compactness of oriented silicon steel bottom layer and oriented silicon steel sheet |
| CN2020109559295 | 2020-09-11 |
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| AU2020102814A4 true AU2020102814A4 (en) | 2020-12-24 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE795568A (en) * | 1972-03-01 | 1973-06-18 | Asea Ab | COATING PROCESS OF A STEEL OBJECT WITH SILICON |
| CA2149279C (en) * | 1994-05-13 | 1999-06-01 | Osamu Tanaka | Annealing separator having excellent reactivity for grain-oriented electrical steel sheet and method of use the same |
| CN100381598C (en) * | 2004-12-27 | 2008-04-16 | 宝山钢铁股份有限公司 | Orientating silicon steel, manufacturing process and equipment |
| CN109306198A (en) * | 2018-08-22 | 2019-02-05 | 武汉钢铁有限公司 | For improving the masking liquid and preparation method thereof of high magnetic induction grain-oriented silicon steel magnesium silicate bottom layer quality |
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2020
- 2020-09-11 CN CN202010955929.5A patent/CN112359350B/en active Active
- 2020-10-16 AU AU2020102814A patent/AU2020102814A4/en not_active Ceased
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| CN112359350A (en) | 2021-02-12 |
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