CN106495706A - A kind of ceramic size, ceramic shell and preparation method thereof - Google Patents
A kind of ceramic size, ceramic shell and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63424—Polyacrylates; Polymethacrylates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63452—Polyepoxides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
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Abstract
The invention discloses a kind of ceramic size, ceramic shell and preparation method thereof.The preparation method of ceramic shell is comprised the following steps：Ceramics and deionized water are mixed according to the ratio of solid content 55～60%, form solution by S1；S2, adds organic monomer and cross-linking agent in the solution；S3, the pH value of the regulation solution add quality is ceramics quality 0.55～0.6% dispersant to after 9～9.5；S4, abundant ball milling form slurry, then remove the bubble in slurry by vacuum stirring；S5, addition quality is the catalyst of the 1～1.5% of organic monomer and crosslinking agent quality sum in the slurry；S6, initiator is added in slurry；S7, slurry is injected in the die cavity of injection machine, and be heating and curing at 50～80 DEG C molding, takes out molding blank from die cavity；S8, is processed to molding blank, and ceramic shell is obtained.Ceramic body obtained in of the invention is unlikely to deform, intensity is high, sintering shrinkage is little.
Description
【Technical field】
The present invention relates to moulded pulp, more particularly to a kind of ceramic size, ceramic shell and preparation method thereof.
【Background technology】
Ceramic material possesses many good characteristics such as wear-resisting, corrosion-resistant, high intensity, high tenacity, heat stability be good.With gold
Category, plastics are compared, and the Mohs' hardness height of ceramic material, dielectric constant are high, no signal is shielded and good biocompatibility, and future is in intelligence
Have broad application prospects on energy mobile phone, wearable device, the third-largest surface structure part after plastics, metal will be become
Material.
Existing prepare ceramic material housing when, first by mixing granulators such as Ceramic Material powder and paraffin, Organic substances after, formed
The solid granular of a diameter of 3-5mm.Particulate material is added in injection machine during molding, by the heater pair of injection machine
Granule heating hot melt after, under the effect of the pressure by hot melt after raw material be injected in mould.In a mold after molding, after the demoulding
Take out.Following process process is carried out to the base substrate for taking out and forms housing.There is following shortcoming in the preparation process：1, base substrate
Easily there is buckling deformation after being removed from the molds；2, easily there is crackle, bubble, deformation etc. and lacks in the thickness junction of blank structure
Fall into；3, base substrate fragility is high, crackle easily occurs, crushes, it is impossible to carries out follow-up sharp processing by machining；4, base substrate exists
In the sintering process of following process process, shrinkage factor reaches more than 30%, easily causes deformation.
【Content of the invention】
The technical problem to be solved is：Above-mentioned the deficiencies in the prior art are made up, a kind of ceramic size, pottery is proposed
Porcelain housing and preparation method thereof, the ceramic body that ceramic size is formed is unlikely to deform, intensity is high, sintering shrinkage is little.
The technical problem of the present invention is solved by following technical scheme：
A kind of preparation method of ceramic shell, comprises the following steps：S1, the ratio according to solid content 55～60% is by pottery
Powder and deionized water mixing, form solution；S2, adds organic monomer and cross-linking agent in the solution；Wherein, organic monomer
Quality for ceramics quality 3.5～4.0%, organic monomer are (10～15) with the mass ratio of cross-linking agent：1；S3, is adjusted described
The pH value of solution adds the dispersant of 0.55～0.6% that quality is ceramics quality to after 9～9.5；S4, above-mentioned material is filled
Bulb separation grinds, and forms slurry, then removes the bubble in slurry by vacuum stirring；S5, it is organic list to add quality in the slurry
The catalyst of the 1～1.5% of body and crosslinking agent quality sum；S6, it is 10～15% that initiator is configured to mass percent
Initiator solution, is added to the initiator solution in slurry according to the 1/15～1/10 of the catalyst quality；S7, will slurry
In the die cavity of material injection injection machine, be heating and curing at 50～80 DEG C molding, takes out molding blank from die cavity；S8, to molding
Base substrate is processed, and ceramic shell is obtained.
One kind ceramic shell according to obtained in preparation method as above.
A kind of preparation method of ceramic size, comprises the following steps：S1, the ratio according to solid content 55～60% is by pottery
Powder and deionized water mixing, form solution；S2, adds organic monomer and cross-linking agent in the solution；Wherein, organic monomer
Quality for ceramics quality 3.5～4.0%, organic monomer are (10～15) with the mass ratio of cross-linking agent：1；S3, is adjusted described
The pH value of solution adds the dispersant of 0.55～0.6% that quality is ceramics quality to after 9～9.5；S4, above-mentioned material is filled
Bulb separation grinds, and forms slurry, then removes the bubble in slurry by vacuum stirring；S5, it is organic list to add quality in the slurry
The catalyst of the 1～1.5% of body and crosslinking agent quality sum；S6, it is 10～15% that initiator is configured to mass percent
The initiator solution is added to slurry according to the 1/15～1/10 of the catalyst quality by initiator solution, and pottery is obtained
Slurry.
One kind ceramic size according to obtained in preparation method as above.
The beneficial effect that the present invention is compared with the prior art is：
In the preparation method of the ceramic size of the present invention, by the proportioning regulation and the control of addition sequence of material, shape
Into water base liquid slurry.Conventional solid-state injection mo(u)lding is replaced using the water base liquid slurry injection mo(u)lding, is had the advantage that：
1, mobility and fillibility of the raw material in mould is improve, is not easy to occur splitting at blank structure thickness change
The defects such as stricture of vagina, bubble., into after porcelain, the even density of shell product, structural integrity are good for blank sintering.
2, the heating-up temperature needed for water base liquid sizing material forming is low, and heating at 50～80 DEG C can complete to solidify, and take off
Temperature difference during mould between mould and ambient temperature is little, and stress is little, does not result in blank deformation.
3, the total organic content added in the water base liquid slurry only accounts for ceramics below 5%, far below conventional solid
The content of 15% in granule, it is to avoid the waste of resource and do not result in pollution to environment using water base, in addition product exists
Deform little during sintering, reserved allowance can be reduced.
4, the density of molding blank is in 4～4.5g/cm3(higher than existing 3.5g/cm3Left and right), solid concentration is up to 60%
More than, more than green strength 35MPa (higher than existing 15～20MPa), so as to directly be cut on green compact, drilling etc.
Machinery or Laser Processing.
【Specific embodiment】
A kind of preparation method of ceramic shell is provided in this specific embodiment, first by ceramics and deionized water, organic
Monomer, cross-linking agent, pH adjusting agent, dispersant, catalyst and initiator are configured to the ceramic size of water base liquid, then by pottery
Slurry is injected into injection mo(u)lding in injection machine, after obtaining molding blank, according to housing (the such as intelligent watch shell of required preparation
Body, mobile terminal case) profile be processed, degreasing sintered, polishing etc. following process process after, be obtained ceramic shell.
Preparation method is comprised the following steps：
Ceramics and deionized water are mixed according to the ratio of solid content 55～60%, form solution by S1.
S2, adds organic monomer and cross-linking agent in the solution；Wherein, the quality of organic monomer is ceramics quality
3.5～4.0%, organic monomer is (10～15) with the mass ratio of cross-linking agent：1.
Preferably, also include adding thermosetting epoxy resin or thermosetting acrylic resin in the step, addition is institute
State the 1/15～1/10 of organic monomer quality.By adding a certain amount of thermosetting epoxy resin, thermosetting acrylic resin, from
And strengthen subsequent heat curing effect.
S3, what the pH value that adjusts the solution added to after 9～9.5 that quality is ceramics quality 0.55～0.6% divide
Powder.
In the step, pH adjusting agent, such as ammonium hydroxide is initially charged, the pH value of solution is adjusted to alkalescence so that dispersion
Agent subsequently preferably can play dispersion effect in the solution, so that it is guaranteed that subsequently there is preferable solidification effect.Preferably, dispersant
Using Polyethylene Glycol, with the preferable intersolubility of deionized water.
S4, by abundant for above-mentioned material ball milling, forms slurry, then removes the bubble in slurry by vacuum stirring.
By ball milling so that Organic substance is dispersed with ceramic powder, dispersant is made fully to adsorb on powder particles surface,
Destruction particle flocculation effect, forming component is uniform, the slurry of good fluidity.
S5, addition quality is the catalyst of the 1～1.5% of organic monomer and crosslinking agent quality sum in the slurry.
Initiator is configured to the initiator solution that mass percent is 10～15%, according to the catalyst quality by S6
1/15～1/10 the initiator solution is added in slurry, with prepared ceramic size.
In above-mentioned steps, by initiator is configured to the solution that mass percent is 10～15%, and its addition is adjusted
Amount so as to control the optimal setting time of slurry, with prevent setting time too short or oversize the demoulding is caused unfavorable.Should be noted
, the addition of above-mentioned catalyst and initiator need to add according to precedence, can not be simultaneously introduced after both are mixed, in order to avoid
Cause initiator to fail, cause slurry to be subsequently unable to heat cure.
In above-mentioned ceramic size, after heating, catalyst therein and initiator cause organic monomer, with cross-linking agent, heat occurs
Curing reaction, so as to curing molding.Due to adopting heat cure, rather than remaining light-initiated solidification, so as to be suitable for existing note
Mould in molding machine carries out injection mo(u)lding, can be molded to form the more complicated device product of structure, for example wearable device (intelligent handss
Ring, intelligent watch), mobile terminal (mobile phone, panel computer) etc., and photocuring needs individually designed acceptable illumination and structure
More single mould, the suitability are narrower.
S7, slurry is injected in the die cavity of injection machine, and be heating and curing at 50～80 DEG C molding, takes out molding from die cavity
Base substrate.
The slurry that aforementioned multiple material is prepared be can liquid injection molding molding zirconia ceramicss slurry system, directly can pass through
Injection machine liquid injection molding molding required product in the mould.Compared with the solid particulate materials of the cerul used by traditional injection moulding molding
There is the advantages such as good fluidity, green strength are high, sintering shrinkage is little.Thermosetting is caused by catalyst and initiator in above-mentioned slurry
Chemical conversion type, forming temperature are relatively low, heat cure molding at can achieve 50～80 DEG C.When being molded than conventional solid particulate materials,
Mold temperature general control is heated at 150～250 DEG C, between the heat curing temperature of this specific embodiment and ambient temperature
The temperature difference is little, and stress is little, does not result in blank deformation.Further, since this specific embodiment be water base liquid slurry, mobility and
Fillibility preferably, is not in the situation of became uneven, it is not easy to the defects such as crackle, bubble occur in die cavity.After tested, into
The density of the base substrate of type is in 4～4.5g/cm3, solid concentration up to more than 60%, more than green strength 35MPa, so as to subsequently may be used
Directly cut on green compact, the machinery such as drilling is laser machined.
S8, is processed to molding blank, and ceramic shell is obtained.
In the step, include the steps such as sharp processing, degreasing sintered, polishing to the processing of base substrate, so as to from base substrate
It is processed into shell product.Blank structure obtained in the slurry of this specific embodiment is uniform, so as to sinter into after porcelain, shell product
Even density, structural integrity is good.Meanwhile, deformation of the base substrate in sintering is also less, can reduce reserved allowance.
As follows, ceramic body is obtained by the ceramic size for arranging specific experimental example to verify this specific embodiment
Density and strength character.
Experimental example one
1, the zirconia ceramicss powder of 100kg is taken, the ratio according to solid content 55% is by zirconia ceramics powder and deionization
Water mixes.
2, add the acrylamide (organic monomer) of 3.5kg, the N of 0.23kg, N methylene-bisacrylamides (cross-linking agent).
Additionally, the thermosetting epoxy resin of 0.35kg is additionally added, as thermal curing agents.
3, add ammonium hydroxide the pH value of solution to be adjusted to alkalescence, add the dispersant Polyethylene Glycol of 0.55kg.
4, after several raw materials are prepared in proportion above, 20～24h of ball milling in ball mill, abrading-ball adopt zirconia ball.
5, after the completion for the treatment of ball milling, slurry is removed the micro-bubble in slurry through vacuum stirring.
6, add and account for (organic monomer+cross-linking agent) mass percent 1.0%, namely the catalyst TEMED of 37.3g.
7, initiator sodium peroxydisulfate is configured to the solution that mass percent is 10%, according to the amount of catalyst quality 1/10
It is added in slurry.
8, slurry is added in the loading hopper of injection machine, ceramic size is injected in die cavity by nozzle.Through 1min
Liquid slurry is heated at a temperature of 50～80 DEG C afterwards, after being completely solidified into type, molding blank is removed from the molds.
After tested, the density of the molding blank is 4g/cm3, green strength is in more than 35MPa.The intensity can achieve directly
Cut on green compact, the machinery such as drilling is laser machined.
9, it is processed using carbide tool or laser on base substrate after shaping.
10, the base substrate for machining becomes ceramic blank after defat, high temperature sintering.
11, ceramic blank meets product size and appearance requirement after CNC, polishing processing.
12, cleaned up in ultrasound wave through the product of processing above, become intelligent watch housing surface structure
Part.
Experimental example two
1, the zirconia ceramicss powder of 100kg is taken, the ratio according to solid content 60% is by zirconia ceramics powder and deionization
Water mixes.
2, add the acrylamide (organic monomer) of 4kg, the N of 0.4kg, N methylene-bisacrylamides (cross-linking agent).This
Outward, the thermosetting acrylic resin of 0.4kg is additionally added, as thermal curing agents.
3, add ammonium hydroxide the pH value of solution to be adjusted to alkalescence, add the dispersant Polyethylene Glycol of 0.6kg.
4, after several raw materials are prepared in proportion above, 20～24h of ball milling in ball mill, abrading-ball adopt zirconia ball.
5, after the completion for the treatment of ball milling, slurry is removed the micro-bubble in slurry through vacuum stirring.
6, add and account for (organic monomer+cross-linking agent) mass percent 1.5%, namely the catalyst TEMED of 66g.
7, initiator sodium peroxydisulfate is configured to the solution that mass percent is 10%, according to the amount of catalyst quality 1/10
It is added in slurry.
8, slurry is added in the loading hopper of injection machine, ceramic size is injected in die cavity by nozzle.Through 1min
Liquid slurry is heated at a temperature of 50～80 DEG C afterwards, after being completely solidified into type, molding blank is removed from the molds.
After tested, the density of the molding blank is 4.2g/cm3, green strength is in more than 35MPa.The intensity can achieve straight
It is connected on green compact and is cut, the machinery such as drilling is laser machined.
9, it is processed using carbide tool or laser on base substrate after shaping.
10, the base substrate for machining becomes ceramic blank after defat, high temperature sintering.
11, ceramic blank meets product size and appearance requirement after CNC, polishing processing.
12, cleaned up in ultrasound wave through the product of processing above, become outside smart mobile phone pottery backboard class
See structural member.
Above content is further description made for the present invention with reference to specific preferred implementation, it is impossible to assert
The present invention be embodied as be confined to these explanations.For general technical staff of the technical field of the invention,
Some replacements or obvious modification is made on the premise of without departing from present inventive concept, and performance or purposes are identical, should all be considered as
Belong to protection scope of the present invention.
Claims (10)
1. a kind of preparation method of ceramic shell, it is characterised in that：Comprise the following steps：S1, according to solid content 55～60%
Ceramics and deionized water are mixed by ratio, form solution；S2, adds organic monomer and cross-linking agent in the solution；Wherein,
The quality of organic monomer for ceramics quality 3.5～4.0%, organic monomer are (10～15) with the mass ratio of cross-linking agent：1；
S3, the pH value of the regulation solution add quality is ceramics quality 0.55～0.6% dispersant to after 9～9.5；S4,
By abundant for above-mentioned material ball milling, slurry is formed, the bubble in slurry is removed by vacuum stirring then；S5, is added in the slurry
Quality is the catalyst of the 1～1.5% of organic monomer and crosslinking agent quality sum；Initiator is configured to mass percent by S6
For 10～15% initiator solution, the initiator solution is added to slurry according to the 1/15～1/10 of the catalyst quality
In material；S7, slurry is injected in the die cavity of injection machine, and be heating and curing at 50～80 DEG C molding, takes out into parison from die cavity
Body；S8, is processed to molding blank, and ceramic shell is obtained.
2. the preparation method of ceramic shell according to claim 1, it is characterised in that：In step S2, also include adding heat
Thermoset epoxy resin or thermosetting acrylic resin, addition are the 1/15～1/10 of the organic monomer quality.
3. the preparation method of ceramic shell according to claim 1, it is characterised in that：In step S2, the organic monomer
For acrylamide, the cross-linking agent is N, N methylene-bisacrylamides.
4. the preparation method of ceramic shell according to claim 1, it is characterised in that：In step S3, the dispersant is
Polyethylene Glycol.
5. the preparation method of ceramic shell according to claim 1, it is characterised in that：In step S6, the initiator is
Sodium peroxydisulfate.
6. the preparation method of ceramic shell according to claim 1, it is characterised in that：Processed in step S8 includes
Sharp processing, degreasing sintered, polishing.
7. the preparation method of ceramic shell according to claim 1, it is characterised in that：In step S8, molding blank is entered
Row processed, is obtained the ceramic shell that can be used as intelligent watch housing, mobile terminal case.
8. ceramic shell obtained in a kind of preparation method according to claims 1 to 7.
9. a kind of preparation method of ceramic size, it is characterised in that：Comprise the following steps：S1, according to solid content 55～60%
Ceramics and deionized water are mixed by ratio, form solution；S2, adds organic monomer and cross-linking agent in the solution；Wherein,
The quality of organic monomer for ceramics quality 3.5～4.0%, organic monomer are (10～15) with the mass ratio of cross-linking agent：1；
S3, the pH value of the regulation solution add quality is ceramics quality 0.55～0.6% dispersant to after 9～9.5；S4,
By abundant for above-mentioned material ball milling, slurry is formed, the bubble in slurry is removed by vacuum stirring then；S5, is added in the slurry
Quality is the catalyst of the 1～1.5% of organic monomer and crosslinking agent quality sum；Initiator is configured to mass percent by S6
For 10～15% initiator solution, the initiator solution is added to slurry according to the 1/15～1/10 of the catalyst quality
Material, is obtained ceramic size.
10. ceramic size obtained in a kind of preparation method according to claim 9.
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Cited By (7)
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| CN109384456A (en) * | 2018-11-23 | 2019-02-26 | 王俊杰 | A kind of ceramic sanitary appliance production technology |
| CN109437945A (en) * | 2018-12-25 | 2019-03-08 | 薛永强 | A kind of ceramic earphone shell and preparation method thereof |
| CN112142461A (en) * | 2019-06-28 | 2020-12-29 | 比亚迪股份有限公司 | Ceramic composition, ceramic, and preparation method and application thereof |
| CN114147225A (en) * | 2021-11-16 | 2022-03-08 | 江苏金物新材料有限公司 | Method for realizing metal injection molding of complex metal parts through thermal curing |
| CN114538938A (en) * | 2022-03-11 | 2022-05-27 | Oppo广东移动通信有限公司 | Shell, preparation method thereof and electronic equipment |
| CN116375467A (en) * | 2023-02-13 | 2023-07-04 | 三祥新材股份有限公司 | Preparation method of zirconia ceramic backboard of wearable equipment |
| CN118026651A (en) * | 2024-01-31 | 2024-05-14 | 江苏三责新材料科技股份有限公司 | Gel-injected ceramic microbeads and preparation method thereof |
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| CN109437945A (en) * | 2018-12-25 | 2019-03-08 | 薛永强 | A kind of ceramic earphone shell and preparation method thereof |
| CN112142461A (en) * | 2019-06-28 | 2020-12-29 | 比亚迪股份有限公司 | Ceramic composition, ceramic, and preparation method and application thereof |
| CN114147225A (en) * | 2021-11-16 | 2022-03-08 | 江苏金物新材料有限公司 | Method for realizing metal injection molding of complex metal parts through thermal curing |
| CN114538938A (en) * | 2022-03-11 | 2022-05-27 | Oppo广东移动通信有限公司 | Shell, preparation method thereof and electronic equipment |
| CN116375467A (en) * | 2023-02-13 | 2023-07-04 | 三祥新材股份有限公司 | Preparation method of zirconia ceramic backboard of wearable equipment |
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Address after: 523843 Guangdong Province, Dongguan city Changan town Xiabian Yincheng Road No. 7 Applicant after: Dongguan Hua Jing powder metallurgy company limited Applicant after: Guangdong wins smart group Limited by Share Ltd Address before: 523843 Guangdong Province, Dongguan city Changan town Xiabian Yincheng Road No. 7 Applicant before: Dongguan Hua Jing powder metallurgy company limited Applicant before: Dongguan Janus Precision Components Co., Ltd. |
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