CN107129156A - A kind of graphene devitrified glass and preparation method thereof - Google Patents
A kind of graphene devitrified glass and preparation method thereof Download PDFInfo
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- CN107129156A CN107129156A CN201710421663.4A CN201710421663A CN107129156A CN 107129156 A CN107129156 A CN 107129156A CN 201710421663 A CN201710421663 A CN 201710421663A CN 107129156 A CN107129156 A CN 107129156A
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C14/00—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix
- C03C14/004—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix the non-glass component being in the form of particles or flakes
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0009—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing silica as main constituent
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2214/00—Nature of the non-vitreous component
- C03C2214/04—Particles; Flakes
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2214/00—Nature of the non-vitreous component
- C03C2214/20—Glass-ceramics matrix
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2214/00—Nature of the non-vitreous component
- C03C2214/30—Methods of making the composites
Abstract
A kind of graphene devitrified glass and preparation method thereof, is related to field of material technology.A kind of graphene devitrified glass, is counted by weight, is prepared the raw material of graphene devitrified glass and is included：55~65 parts of quartz, 5~15 parts of lime stone, 5~15 parts of aluminum oxide, 5~15 parts of magnesia, 1~3 part of titanium dioxide, 1~3 part of manganese oxide, 1~5 part of graphite powder.The material has stronger mechanical mechanics property, wider application, preferable application prospect.A kind of preparation method of graphene devitrified glass, including：Raw material is mixed, grind, be molded, sintered.This method preparation process is simple, and preparation cost is low, is adapted to large-scale production.
Description
Technical field
The present invention relates to field of material technology, and more particularly to a kind of graphene-devitrified glass and preparation method thereof.
Background technology
Graphene (Graphene) is a kind of novel nano-material for the individual layer laminated structure being made up of carbon atom, former by carbon
Son constitutes the flat film that hexangle type is in honeycomb lattice, only one of which carbon atom thickness with sp2 hybridized orbits.Graphene is known
Most thin, the most hard nano material in world, its unique two-dimensional nanostructure, excellent mechanics, physics and functional performance make
It has important application potential in terms of development high-performance composite materials and functional material.
Devitrified glass, as the selectable high-grade ornament materials of one kind, is to add nucleus in the parent glass of specific composition
Agent, mutually uniformly divides by a kind of prepared by certain Heat Treatment Control parent glass controlled micro crystallization containing a large amount of crystallite phases and glass
The polycrystalline composite solid material of cloth.People increasingly pay attention to the devitrified glass for possessing multiple performance, to meet different demands.
The content of the invention
It is an object of the invention to provide a kind of graphene-devitrified glass, the material has stronger mechanical mechanics property,
Wider application, preferable application prospect.
Another object of the present invention is to provide a kind of preparation method of graphene-devitrified glass, this method preparation process
Simply, prepare cost low, be adapted to large-scale production.
The present invention is solved its technical problem and realized using following technical scheme.
The present invention proposes a kind of graphene-devitrified glass, counts by weight, prepares the raw material of graphene-devitrified glass
Including：55~65 parts of quartz, 5~15 parts of lime stone, 5~15 parts of aluminum oxide, 5~15 parts of magnesia, 1~3 part of titanium dioxide, oxygen
Change 1~3 part of manganese, 1~5 part of graphite powder.
The present invention proposes a kind of preparation method of graphene-devitrified glass, including：Raw material is mixed, grind, be molded, burnt
Knot.
A kind of beneficial effect of graphene-devitrified glass of the embodiment of the present invention and preparation method thereof is：
A kind of graphene-devitrified glass that the present invention is provided, after graphite powder is well mixed with other raw materials, using microcomputer
Tool stripping method, graphite powder is stripped as graphene in the presence of external force.Through overmolding, sintering, graphene sheet layer is uniformly divided
It is distributed in the structure that devitrified glass phase is mutually constituted with glass, forms the nano composite structure of network connection, obtains that there is higher resist
Compressive Strength, rupture strength, hardness, graphene-devitrified glass of wearability.
A kind of preparation method of graphene-devitrified glass, this method preparation process is simple, it is low to prepare cost, be adapted to scale
Metaplasia is produced.
Embodiment
, below will be in the embodiment of the present invention to make the purpose, technical scheme and advantage of the embodiment of the present invention clearer
Technical scheme be clearly and completely described.Unreceipted actual conditions person, builds according to normal condition or manufacturer in embodiment
The condition of view is carried out.Agents useful for same or the unreceipted production firm person of instrument, are the conventional production that can be obtained by commercially available purchase
Product.
A kind of graphene-devitrified glass of the embodiment of the present invention and preparation method thereof is specifically described below.
A kind of graphene-devitrified glass provided in an embodiment of the present invention, is counted by weight, prepares graphene-crystallite glass
The raw material of glass includes：55~65 parts of quartz, 5~15 parts of lime stone, 5~15 parts of aluminum oxide, 5~15 parts of magnesia, titanium dioxide 1
~3 parts, 1~3 part of manganese oxide, 1~5 part of graphite powder.
Further, in the preferred embodiment of the present invention, count by weight, raw material includes：Quartzy 58~63 parts, stone
8~12 parts of lime stone, 7~10 parts of aluminum oxide, 8~10 parts of magnesia, 1~3 part of titanium dioxide, 1~3 part of manganese oxide, graphite powder 1~
5 parts.
Quartz is a kind of physical property and chemical property sufficiently stable mineral resources, and main component is SiO2, it is colourless
It is transparent, often it is changed into translucent or opaque crystal containing a small amount of impurity component, quality is hard.
Lime stone is the primary raw material for producing glass.
Aluminum oxide is a kind of compound of high rigidity, available for production microlite.
Magnesia plays the setting rate and crystallization property that fluxing action can control glass metal, prevents glass metal in cooling procedure
In become opaque crystal.
Titanium dioxide is a kind of excellent photoelectric functional material, with superior photocatalysis, opto-electronic conversion, dielectric effect and light
Learn the performance such as non-linear and noticeable, and the effects such as with resistance ultraviolet, anti-aging, antibacterial, automatically cleaning.Preferably, receive
Rice titanium dioxide can make glass have self-cleaning excellent properties.
It is most containing impurity such as cobalt, iron in raw material for producing glass, the color of glass is have impact on, dioxy is placed in right amount
Changing manganese can make glass become colorless, and add different amounts of manganese dioxide so that glass has different colours.
In the present invention, graphite powder is selected from natural flake graphite.Crystalline flake graphite is natural phenocrystalline graphite, and it is similar to fish phosphorus
Shape, belongs to hexagonal crystal system, in layer structure, with performances such as good high temperature resistant, conduction, heat conduction, lubrication, plastic and acid and alkali-resistances.
The embodiment of the present invention additionally provides a kind of preparation method of graphene-devitrified glass, including：Raw material is mixed, ground
Mill, shaping, sintering.
Mixing, grinding：Proportionally weigh raw material, mixing.The raw material of mixing is added to enter in ball mill with ball-milling additive
Row ball milling obtains well mixed mixture.In order to ball milling fully, Ball-milling Time be 1~24h, rotational speed of ball-mill be 400~
1000r/min。
Add ball-milling additive be improve to optimize the ball milling of ball mill, be more prone to grinding ball milling quality and
Yield, can protect ball mill, reduce loss.In the presence of ball-milling additive, using mechanical stripping method, by abundant for a long time
Ball action, graphite powder peeled off repeatedly many times by impulsive force and shearing force, graphite flake layer, obtains uniform graphene
The mixture of nanoscale twins and devitrified glass raw material.
Further, in the preferred embodiment of the present invention, ball-milling additive includes lauryl sodium sulfate, detergent alkylate
At least one of sodium sulfonate, methyl pyrrolidone, dimethylformamide.
Shaping：Obtain after well mixed mixture, heating mixture is to melting, and temperature is 1500~1530 DEG C, insulation 1
After~2h, it is homogenized, clarifies to obtain glass metal.During being somebody's turn to do, raw material is changed into semi-molten sinter from solid-state, then is changed into transparent glass
Glass liquid.Glass metal continues to heat, the reduction of its viscosity, and therefrom releases gaseous state impurity.The homogenization process of glass metal is in glass shape
Into when have started to, in the clarifying process later stage, carried out together with clarification.Homogenization is exactly that striped and its are eliminated in glass metal
His uneven body, makes glass metal each several part reach expected uniformity in chemical composition.
After melting, by glass metal, water quenching produces frit in cold water immediately.Glass metal is after water quenching, and particle is tiny,
Surface area increase, it is easier to crystallization.By frit dry for standby.
Sintering：Obtain after frit, in order to obtain the devitrified glass that quality is high, frit is ground to 5~10 mesh.Load
In mould, high temperature furnace is put into, 900~950 DEG C are warming up to 5~10 DEG C/min heating rate, the heating rate and temperature have
Help the formation of nucleus.1~3h is incubated, after after the nucleus for occurring largely stablizing in glass, then with 4~5 DEG C/min heating speed
Rate is warming up to 1100~1200 DEG C, and the heating rate and temperature contribute to the growth of crystal, is incubated 1~3h, and Glass Transition is tool
There is the devitrified glass of nanocrystalline grain size.Cool to room temperature with the furnace, obtain graphene-devitrified glass.
Graphene-devitrified glass prepared by the embodiment of the present invention, graphene sheet layer is uniformly distributed in devitrified glass and met glass
In the structure that glass is mutually constituted, the nano composite structure of network connection is formed, strengthens the intensity of devitrified glass.Wherein, graphene film
Thickness degree is 0.34~50nm.The thickness contributes to the stability of structure, devitrified glass is had more excellent mechanical performance.
The feature and performance to the present invention are described in further detail with reference to embodiments.
Embodiment 1
A kind of graphene-devitrified glass is present embodiments provided, is made by following method：
Take 55 parts of quartz, 5 parts of lime stone, 5 parts of aluminum oxide, 5 parts of magnesia, 1 part of titanium dioxide, 1 part of manganese oxide, graphite powder
1 part, added after mixing with ball-milling additive in ball mill, the fully ball milling 1h under conditions of rotating speed is 400r/min is mixed
Uniform mixture.Wherein, ball-milling additive includes lauryl sodium sulfate.
Mixture is heated under conditions of 1500 DEG C after melting, insulation 1h, is homogenized, clarifies to obtain glass metal, immediately will
Glass metal water quenching in cold water obtains frit, dry for standby.
Frit is ground to 5 mesh, is fitted into mould, is put into high temperature furnace, 900 are warming up to 10 DEG C/min heating rate
DEG C, be incubated 1h, then 1100 DEG C are warming up to 5 DEG C/min heating rate, be incubated 1h, cool to room temperature with the furnace, obtain graphene-
Devitrified glass.
Embodiment 2
A kind of graphene-devitrified glass is present embodiments provided, is made by following method：
Take 65 parts of quartz, 15 parts of lime stone, 15 parts of aluminum oxide, 15 parts of magnesia, 3 parts of titanium dioxide, 3 parts of manganese oxide, stone
5 parts of ink powder, is added in ball mill after mixing with ball-milling additive, the fully ball milling 24h under conditions of rotating speed is 1000r/min, is obtained
To well mixed mixture.Wherein, ball-milling additive includes lauryl sodium sulfate, neopelex.
Mixture is heated under conditions of 1500 DEG C after melting, insulation 1h, is homogenized, clarifies to obtain glass metal, immediately will
Glass metal water quenching in cold water obtains frit, dry for standby.
Frit is ground to 5 mesh, is fitted into mould, is put into high temperature furnace, 950 are warming up to 10 DEG C/min heating rate
DEG C, be incubated 3h, then 1200 DEG C are warming up to 5 DEG C/min heating rate, be incubated 3h, cool to room temperature with the furnace, obtain graphene-
Devitrified glass.
Embodiment 3
A kind of graphene-devitrified glass is present embodiments provided, is made by following method：
Take 58 parts of quartz, 8 parts of lime stone, 7 parts of aluminum oxide, 8 parts of magnesia, 2 parts of titanium dioxide, 1 part of manganese oxide, graphite powder
3 parts, added after mixing with ball-milling additive in ball mill, the fully ball milling 8h under conditions of rotating speed is 700r/min is mixed
Uniform mixture.Wherein, ball-milling additive includes methyl pyrrolidone, dimethylformamide.
Mixture is heated under conditions of 1520 DEG C after melting, insulation 2h, is homogenized, clarifies to obtain glass metal, immediately will
Glass metal water quenching in cold water obtains frit, dry for standby.
Frit is ground to 8 mesh, is fitted into mould, is put into high temperature furnace, 925 are warming up to 7 DEG C/min heating rate
DEG C, be incubated 2h, then 1150 DEG C are warming up to 4 DEG C/min heating rate, be incubated 2h, cool to room temperature with the furnace, obtain graphene-
Devitrified glass.
Embodiment 4
A kind of graphene-devitrified glass is present embodiments provided, is made by following method：
Take 63 parts of quartz, 12 parts of lime stone, 10 parts of aluminum oxide, 10 parts of magnesia, 3 parts of titanium dioxide, 3 parts of manganese oxide, stone
5 parts of ink powder, is added in ball mill after mixing with ball-milling additive, the fully ball milling 13h under conditions of rotating speed is 1000r/min, is obtained
To well mixed mixture.Wherein, ball-milling additive includes lauryl sodium sulfate, dimethylformamide.
Mixture is heated under conditions of 1510 DEG C after melting, insulation 1h, is homogenized, clarifies to obtain glass metal, immediately will
Glass metal water quenching in cold water obtains frit, dry for standby.
Frit is ground to 10 mesh, is fitted into mould, is put into high temperature furnace, 900 are warming up to 8 DEG C/min heating rate
DEG C, 1h is incubated, then 1200 DEG C are warming up to 4.5 DEG C/min heating rate, 1h is incubated, room temperature is cooled to the furnace, obtains graphite
Alkene-devitrified glass.
Embodiment 5
A kind of graphene-devitrified glass is present embodiments provided, is made by following method：
Take 60 parts of quartz, 9 parts of lime stone, 12 parts of aluminum oxide, 7 parts of magnesia, 3 parts of titanium dioxide, 1 part of manganese oxide, graphite
4 parts of powder, is added in ball mill after mixing with ball-milling additive, the fully ball milling 20h under conditions of rotating speed is 800r/min, is mixed
Close uniform mixture.Wherein, ball-milling additive include lauryl sodium sulfate, neopelex, methyl pyrrolidone,
Dimethylformamide.
Mixture is heated under conditions of 1500 DEG C after melting, insulation 1h, is homogenized, clarifies to obtain glass metal, immediately will
Glass metal water quenching in cold water obtains frit, dry for standby.
Frit is ground to 7 mesh, is fitted into mould, is put into high temperature furnace, 900 are warming up to 10 DEG C/min heating rate
DEG C, be incubated 2h, then 1100 DEG C are warming up to 4 DEG C/min heating rate, be incubated 1h, cool to room temperature with the furnace, obtain graphene-
Devitrified glass.
Embodiment 6
A kind of graphene-devitrified glass is present embodiments provided, is made by following method：
Take 60 parts of quartz, 10 parts of lime stone, 10 parts of aluminum oxide, 10 parts of magnesia, 2 parts of titanium dioxide, 2 parts of manganese oxide, stone
5 parts of ink powder, is added in ball mill after mixing with ball-milling additive, the fully ball milling 12h under conditions of rotating speed is 700r/min, is obtained
Well mixed mixture.Wherein, ball-milling additive includes lauryl sodium sulfate, neopelex, crassitude
Ketone, dimethylformamide.
Mixture is heated under conditions of 1530 DEG C after melting, insulation 2h, is homogenized, clarifies to obtain glass metal, immediately will
Glass metal water quenching in cold water obtains frit, dry for standby.
Frit is ground to 8 mesh, is fitted into mould, is put into high temperature furnace, 950 are warming up to 8 DEG C/min heating rate
DEG C, be incubated 3h, then 1200 DEG C are warming up to 5 DEG C/min heating rate, be incubated 3h, cool to room temperature with the furnace, obtain graphene-
Devitrified glass.
Test example
Graphene-devitrified glass prepared by embodiment 1~6 is chosen, performance detection is carried out, it is as a result as follows：
The performance test results of table 1
As shown in Table 1, the devitrified glass that embodiment 1~6 is provided has preferable compression strength, rupture strength, micro- hard
Degree and density.Wherein, the performance for the devitrified glass that embodiment 6 is provided is optimal, illustrates the raw material and preparation method of the offer of embodiment 6
More rationally, it can prepare
In summary, a kind of graphene-devitrified glass that the present invention is provided, graphite powder is well mixed with other raw materials
Afterwards, using micromechanics stripping method, graphite powder is stripped as graphene in the presence of external force.Through overmolding, sintering, by graphite
Alkene lamella is uniformly distributed in the structure that devitrified glass phase is mutually constituted with glass, is formed the nano composite structure of network connection, is obtained
To with advantages of higher compressive strength, rupture strength, hardness, wearability graphene-devitrified glass.
Embodiments described above is a part of embodiment of the invention, rather than whole embodiments.The reality of the present invention
The detailed description for applying example is not intended to limit the scope of claimed invention, but is merely representative of the selected implementation of the present invention
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of protection of the invention.
Claims (10)
1. a kind of graphene-devitrified glass, it is characterised in that count by weight, prepares the original of the graphene-devitrified glass
Material includes：Quartz 55~65 parts, 5~15 parts of lime stone, 5~15 parts of aluminum oxide, 5~15 parts of magnesia, 1~3 part of titanium dioxide,
1~3 part of manganese oxide, 1~5 part of graphite powder.
2. graphene-devitrified glass according to claim 1, it is characterised in that count by weight, the raw material bag
Include：Described quartzy 58~63 parts, 8~12 parts of the lime stone, 7~10 parts of the aluminum oxide, 8~10 parts of the magnesia, institute
State 1~3 part of titanium dioxide, 1~3 part of the manganese oxide, 1~5 part of the graphite powder.
3. a kind of preparation method of graphene-devitrified glass as claimed in claim 1 or 2, it is characterised in that including：By institute
State raw material mixing, grinding, shaping, sintering.
4. the preparation method of graphene-devitrified glass according to claim 3, it is characterised in that grind after mixing
The method of the raw material includes：Ball milling is carried out under conditions of ball-milling additive presence.
5. the preparation method of graphene-devitrified glass according to claim 4, it is characterised in that Ball-milling Time is 1~
24h, rotational speed of ball-mill is 400~1000r/min.
6. the preparation method of graphene-devitrified glass according to claim 4, it is characterised in that the ball-milling additive bag
Include at least one of lauryl sodium sulfate, neopelex, methyl pyrrolidone, dimethylformamide.
7. the preparation method of graphene-devitrified glass according to claim 4, it is characterised in that blended, grinding institute
Raw material is stated to be molded by the following method：The mixture obtained by grinding is heated to melting, after 1~2h of insulation, is homogenized, clarifies to obtain glass
Glass liquid；The water quenching in cold water by the glass metal.
8. the preparation method of graphene-devitrified glass according to claim 7, it is characterised in that the heating mixture
Temperature be 1500~1530 DEG C.
9. the preparation method of graphene-devitrified glass according to claim 7, it is characterised in that the method for sintering includes：
Grinding is warming up to 900~950 DEG C for the first time by the glass metal frit that water quenching is obtained in the cold water, is incubated 1~3h
Afterwards, then for the second time 1100~1200 DEG C are warming up to, 1~3h, cooling is incubated.
10. the preparation method of graphene-devitrified glass according to claim 9, it is characterised in that the speed heated up for the first time
Rate is 5~10 DEG C/min, and the speed of second of heating is 4~5 DEG C/min.
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| CN201710421663.4A CN107129156A (en) | 2017-06-06 | 2017-06-06 | A kind of graphene devitrified glass and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108164148A (en) * | 2017-12-30 | 2018-06-15 | 常州市奥普泰科光电有限公司 | A kind of preparation method of low-temperature sintering type devitrified glass |
| CN110482864A (en) * | 2019-09-18 | 2019-11-22 | 安徽省聚科石墨烯科技股份公司 | A kind of doped graphite ene-type glass ceramics additive and preparation method thereof |
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| CN105174721A (en) * | 2015-06-10 | 2015-12-23 | 安徽省德邦瓷业有限公司 | High temperature resistance glass ceramic dish and preparation method thereof |
| CN105837046A (en) * | 2016-03-28 | 2016-08-10 | 陈淳 | Environment-friendly energy-saving glass ceramic and preparation method thereof |
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| CN103496850A (en) * | 2013-09-25 | 2014-01-08 | 四川一名微晶科技股份有限公司 | Black microcrystalline glass sheet material and production method thereof |
| CN105174721A (en) * | 2015-06-10 | 2015-12-23 | 安徽省德邦瓷业有限公司 | High temperature resistance glass ceramic dish and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108164148A (en) * | 2017-12-30 | 2018-06-15 | 常州市奥普泰科光电有限公司 | A kind of preparation method of low-temperature sintering type devitrified glass |
| CN110482864A (en) * | 2019-09-18 | 2019-11-22 | 安徽省聚科石墨烯科技股份公司 | A kind of doped graphite ene-type glass ceramics additive and preparation method thereof |
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Application publication date: 20170905 |