EP1831122A1 - A method of preparing coated foam glass articles and articles thereby obtained - Google Patents

A method of preparing coated foam glass articles and articles thereby obtained

Info

Publication number
EP1831122A1
EP1831122A1 EP05822283A EP05822283A EP1831122A1 EP 1831122 A1 EP1831122 A1 EP 1831122A1 EP 05822283 A EP05822283 A EP 05822283A EP 05822283 A EP05822283 A EP 05822283A EP 1831122 A1 EP1831122 A1 EP 1831122A1
Authority
EP
European Patent Office
Prior art keywords
foam glass
glass
weight
parts
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05822283A
Other languages
German (de)
French (fr)
Inventor
Federico Smeacetto
Andrea Ventrella
Monica Ferraris
Claudio Saponaro
Milena Salvo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Politecnico di Torino
Original Assignee
Politecnico di Torino
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Politecnico di Torino filed Critical Politecnico di Torino
Publication of EP1831122A1 publication Critical patent/EP1831122A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C03C11/00—Multi-cellular glass ; Porous or hollow glass or glass particles
    • C03C11/007—Foam glass, e.g. obtained by incorporating a blowing agent and heating
    • 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
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/006—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character
    • C03C17/007—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
    • E04B1/78—Heat insulating elements
    • 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
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B2001/742—Use of special materials; Materials having special structures or shape

Definitions

  • the present invention relates to a method of preparing coated foam glass articles and to the articles thereby obtained.
  • the foam glass thanks to its intrinsic properties, enables to easily insulate both civil buildings and technological implants without the need of thermal bridges.
  • coated foam glass articles having a protective and/or finishing coating, which are suitable for use in the building field (for example as facing materials) and which are cheap and easy to obtain.
  • the following technical peculiarities should allow the coating to be also used in the building field: fire resistance; no smoke generation; very low or no superficial adsorption; meteoric water impermeability; low thermal expansion; low density (i.e. up to about 1,3 kg/m 3 ); high resistance to vandalisms, especially by sprayed colors; hygienic surface; possibility of coat-insulation system, high chemical inertness; n liability to frost damage.
  • US patent 4,833,015 describes the production of coated foam glass articles, which are constituted by the foam glass itself, an intermediate layer and a glass coating (which is not foamed) .
  • coated foam glass articles are prepared by layered deposition of the powdered or granulated components forming each layer followed by firing: the foam glass is produced and coated by a single thermal process.
  • the method of the invention involves the deposition, on the foam glass constituting the substrate, of a coating composition comprising as the essential components powdered foam glass, boric oxide, zinc oxide and at least one alkaline metal oxide, particularly sodium oxide, as modifier oxides.
  • the coating composition is laid as a layer typically 0,5-2 mm thick on the foam glass substrate in the form of a suspension (slurry) in a vehicle consisting an organic binder, such as for example acetone, and then it is subjected to a thermal firing treatment so as to produce a glass, glass-ceramic or glass and glass-ceramic matrix composite coating layer adhering to the substrate.
  • a suspension slurry
  • organic binder such as for example acetone
  • the coating composition is prepared by milling the solid components to a mean particle size lower than 63 ⁇ m, preferably comprised between 10 and 20- ⁇ m, in order to obtain a mixture of powders. Such mixture is then suspended or dispersed in a binder. Typically the suspension comprises from 40 to 60 weight % of dry solids, the balance to 100 consisting of the binder.
  • the application of the coating to the substrate can be carried out by means of conventional techniques, generally with a thickness comprised between 0,5 and 2 mm.
  • the firing heat treatment is typically carried out in an oven at a temperature comprised between 500 0 C and 650 0 C, for a period of time of about 30-60 minutes.
  • the firing temperature is selected in dependence on ,the chemical-physical characteristics of the foam glass substrate and of the slurry, and is lower than the glass transition temperature (Tg) of the substrate.
  • Tg glass transition temperature
  • the mixture of foam glass and modifier oxides comprises the following essential components:
  • the mixture can comprise other components in addition to the essential ones cited above, for example other known fluidizing agents, as well as oxides of other alkaline or alkaline-earth metals, for example lithium oxides.
  • the mixture can also contain pigments or dyes and therefore it allows the production of foam glasses coated in several chromatic shades.
  • the percentages of the aforesaid components are selected so as to achieve a coating having a Tg and/or a linear coefficient of thermal expansion which is lower or substantially the same as thatof the foam glass substrate being used. It is also preferred that • the linear coefficient of thermal expansion of the coating is not lower by more than 10% than the linear coefficient of thermal expansion of the substrate.
  • any glass composition generally employed for the preparation of foam glasses may be used. However, it would be preferred to use a foam glass having the same physical properties and/or the same chemical composition as the foam glass used as the substrate, so as to ensure a good interface behaviour of the two materials and to avoid any separation in the case of high temperature excursions.
  • the components of the coating mixture are all not toxic for the body.
  • Such a mixture is preferably free from lead oxide, since this material, although providing very low-melting mixtures, would be very dangerous during processing because it is highly toxic for the body.
  • Boron oxide (B2O3) is currently an essential component of thermal shock resistant glasses and enamels. It makes the glass shining and improves the aesthetic appearance.
  • boron oxide In order to introduce boron oxide into the glasses, it is possible to make use of industrial products obtained by chemical transformation of natural occurring boron ores, for example anhydrous borax (Na 2 B 4 O 7 ) , borax penta- and decahydrate, boric acid (H 3 BO 3 ) or boron oxide.
  • Zinc oxide is introduced into the vitrifiable mixture as such or as a carbonate. This oxide allows to reduce the coefficient of thermal expansion, to affect the thermal shock resistance and to improve the chemical resistance of the glasses. It is employed in the composition of opaque glasses and in cadmium selenide coloured glasses, where it plays a crucial role to the development of the red colour of glasses.
  • Sodium oxide ensures fusibility of glass; moreover, its use results in a modification of the viscosity, density, thermal expansion and mechanical and chemical resistance of the glass.
  • This component can be introduced for example as sodium carbonate.
  • coated foam glass articles of the present invention are suitable for use as a tiled thermal insulation of civil and industrial buildings (external side) , or for internal coating of any "special premises or equipment” (swimming pools, ice- skating rinks, shops, premises which are highly exposed to chemical attack, pipes for aeriform substances and fluids, galleries, stations, tunnels, etc.) .
  • the said articles may be produced in the shape of sheets or blocks, or as panels obtained for example by junction of a plurality of single sheets before the application of the coating.
  • the coating composition employed in the coating method of the present invention can be used as the butt joint material of the foam glass sheets or blocks.
  • a coated foam glass has been prepared using as the substrate a foam glass having the following composition:
  • the substrate has been coated with a coating composition comprising:
  • the above coating composition has been powdered by- milling the various components. Subsequently, the milled material has been prepared in the form of a slurry, using acetone as the organic binder, and deposited on the foam glass substrate. The foam glass substrate together with the coating layer were subjected to thermal treatment at 550 0 C for a period of 40 minutes.
  • the glass thereby produced proved to be suitable for obtaining good coatings in that, thanks to its melting temperature which is not too high, it avoids softening of the foam glass during the heat treatment in oven.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electromagnetism (AREA)
  • Composite Materials (AREA)
  • Dispersion Chemistry (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Glass Compositions (AREA)

Abstract

A method of preparing foam glass articles comprising a foam glass substrate provided with a protective and/or finishing coating is described. The protective coating of the foam glass articles obtainable by the method of the invention is made of a glass material, a glass-ceramic material or a glass and glass-ceramic matrix composite material formed by a mixture comprising powdered foam glass, boric anhydride, zinc oxide and at least one alkaline metal oxide.

Description

A method of preparing coated foam glass articles and articles thereby obtained
The present invention relates to a method of preparing coated foam glass articles and to the articles thereby obtained.
In modern building, insulation has taken on a very important role and it is inevitable to notice the limits of traditional insulation materials.
The foam glass, thanks to its intrinsic properties, enables to easily insulate both civil buildings and technological implants without the need of thermal bridges. The durability, safety, environmental compatibility, non-toxicity, low installation costs, make the foam glass a major insulation material not only for civil building applications but also, in many cases, for industrial implants.
However, one of the limits of the foam glasses currently on the market consists in the existing coating possibilities, which are essentially polymeric and metallic coatings which are mainly intended for protecting the insulation materials from atmospheric agents and from gas permeation (e.g., water vapor or other gases) .
Although for special applications wear resistant polyurethane coatings are available, these coatings are mainly used for industrial applications and the installation mode and related costs prevent their use in the building field.
Thus, it would be desirable to have coated foam glass articles, having a protective and/or finishing coating, which are suitable for use in the building field (for example as facing materials) and which are cheap and easy to obtain. Particularly, the following technical peculiarities should allow the coating to be also used in the building field: fire resistance; no smoke generation; very low or no superficial adsorption; meteoric water impermeability; low thermal expansion; low density (i.e. up to about 1,3 kg/m3 ); high resistance to vandalisms, especially by sprayed colors; hygienic surface; possibility of coat-insulation system, high chemical inertness; n liability to frost damage.
US patent 4,833,015 describes the production of coated foam glass articles, which are constituted by the foam glass itself, an intermediate layer and a glass coating (which is not foamed) . These coated foam glass articles are prepared by layered deposition of the powdered or granulated components forming each layer followed by firing: the foam glass is produced and coated by a single thermal process.
It . would be desirable to have a method of preparing coated foam glass articles in which the protective coating may be applied on a glass which is already formed, for example as slabs or blocks, without decreasing the thermo-mechanical properties of the foam glass.
These aims are achieved by a method of preparing coated foam glass articles as defined in the appended claims, and by the coated foam glass articles obtained .by the method of the invention, which are also defined in the appended claims.
The method of the invention involves the deposition, on the foam glass constituting the substrate, of a coating composition comprising as the essential components powdered foam glass, boric oxide, zinc oxide and at least one alkaline metal oxide, particularly sodium oxide, as modifier oxides.
According to the method of the invention the coating composition is laid as a layer typically 0,5-2 mm thick on the foam glass substrate in the form of a suspension (slurry) in a vehicle consisting an organic binder, such as for example acetone, and then it is subjected to a thermal firing treatment so as to produce a glass, glass-ceramic or glass and glass-ceramic matrix composite coating layer adhering to the substrate.
The coating composition is prepared by milling the solid components to a mean particle size lower than 63 μm, preferably comprised between 10 and 20- μm, in order to obtain a mixture of powders. Such mixture is then suspended or dispersed in a binder. Typically the suspension comprises from 40 to 60 weight % of dry solids, the balance to 100 consisting of the binder.
The application of the coating to the substrate can be carried out by means of conventional techniques, generally with a thickness comprised between 0,5 and 2 mm.
The firing heat treatment is typically carried out in an oven at a temperature comprised between 5000C and 6500C, for a period of time of about 30-60 minutes. The firing temperature is selected in dependence on ,the chemical-physical characteristics of the foam glass substrate and of the slurry, and is lower than the glass transition temperature (Tg) of the substrate. According to a preferred embodiment, the mixture of foam glass and modifier oxides comprises the following essential components:
3-20 parts by weight of powdered foam glass;
40-60 parts by weight of boric anhydride;
30-40 parts by weight of zinc oxide;
10-20 parts by weight of oxide of sodium oxide, the aforementioned parts by weight being referred to a total of 100 parts by weight of the mixture of the four cited components. However, the mixture can comprise other components in addition to the essential ones cited above, for example other known fluidizing agents, as well as oxides of other alkaline or alkaline-earth metals, for example lithium oxides. The mixture can also contain pigments or dyes and therefore it allows the production of foam glasses coated in several chromatic shades.
The percentages of the aforesaid components are selected so as to achieve a coating having a Tg and/or a linear coefficient of thermal expansion which is lower or substantially the same as thatof the foam glass substrate being used. It is also preferred that • the linear coefficient of thermal expansion of the coating is not lower by more than 10% than the linear coefficient of thermal expansion of the substrate.
As the foam glass component of the coating mixture, any glass composition generally employed for the preparation of foam glasses may be used. However, it would be preferred to use a foam glass having the same physical properties and/or the same chemical composition as the foam glass used as the substrate, so as to ensure a good interface behaviour of the two materials and to avoid any separation in the case of high temperature excursions.
Finally, it is to notice that the components of the coating mixture are all not toxic for the body. Such a mixture, in fact, is preferably free from lead oxide, since this material, although providing very low-melting mixtures, would be very dangerous during processing because it is highly toxic for the body.
Boron oxide (B2O3) is currently an essential component of thermal shock resistant glasses and enamels. It makes the glass shining and improves the aesthetic appearance. In order to introduce boron oxide into the glasses, it is possible to make use of industrial products obtained by chemical transformation of natural occurring boron ores, for example anhydrous borax (Na2B4O7) , borax penta- and decahydrate, boric acid (H3BO3) or boron oxide.
Zinc oxide is introduced into the vitrifiable mixture as such or as a carbonate. This oxide allows to reduce the coefficient of thermal expansion, to affect the thermal shock resistance and to improve the chemical resistance of the glasses. It is employed in the composition of opaque glasses and in cadmium selenide coloured glasses, where it plays a crucial role to the development of the red colour of glasses.
Sodium oxide ensures fusibility of glass; moreover, its use results in a modification of the viscosity, density, thermal expansion and mechanical and chemical resistance of the glass. This component can be introduced for example as sodium carbonate. Together with the potentially high aesthetical valence of coated foam glass products obtainable with the method of the invention, it should be underlined from a technological point of view that the present coating method is applicable to preformed foam glass articles which are currently on the market, in contrast to. the known coating methods in which the coating is produced during the manufacturing process of the foam glass itself.
The coated foam glass articles of the present invention are suitable for use as a tiled thermal insulation of civil and industrial buildings (external side) , or for internal coating of any "special premises or equipment" (swimming pools, ice- skating rinks, shops, premises which are highly exposed to chemical attack, pipes for aeriform substances and fluids, galleries, stations, tunnels, etc.) .
The said articles may be produced in the shape of sheets or blocks, or as panels obtained for example by junction of a plurality of single sheets before the application of the coating. To this aim, the coating composition employed in the coating method of the present invention can be used as the butt joint material of the foam glass sheets or blocks.
EXAMPLE
A coated foam glass has been prepared using as the substrate a foam glass having the following composition:
SiO2 65 .77 %
Al2O3 5. 58 %
CaO 5. 83 %
MgO 2. 63 %
Na2O 13 .44 % W 2
K2O 1 . 59
SO3 0 . 47 %
Fe2O3 2 . 97 %
BaO 0 . 03 %
TiO2 0 . 04 %
SrO 0 . 01 %
MnO 1 . 62 %
Carbon 0 . 2 %
The substrate has been coated with a coating composition comprising:
Boron oxide (B2O3) 50 %
Zinc oxide (ZnO) 33 %
Sodium oxide (Na2O) 12 %
Foam glass 5 %
First, the above coating composition has been powdered by- milling the various components. Subsequently, the milled material has been prepared in the form of a slurry, using acetone as the organic binder, and deposited on the foam glass substrate. The foam glass substrate together with the coating layer were subjected to thermal treatment at 5500C for a period of 40 minutes.
A glass characterized by a glass transition temperature Tg of 5040C and a linear coefficient of thermal expansion α of 9.194 10"6 K"1 has been obtained.
If the above parameters are compared to the characteristics of foam glass (Tg=552°C, linear coefficient thermal expansion α=9.546 io"6 K"1) a remarkable chemical and physical compatibility can be easily observed." It is in fact known that the application temperature of the coating should be lower than the softening point of foam glass; the linear coefficient of thermal expansion should be compatible with, or at least slightly lower than, the linear coefficient of thermal expansion of foam glasses, in order for the coating layer to result slightly compressed.
The glass thereby produced proved to be suitable for obtaining good coatings in that, thanks to its melting temperature which is not too high, it avoids softening of the foam glass during the heat treatment in oven.

Claims

1. A method of producing foam glass articles comprising a foam glass substrate provided with a protective and/or finishing coating, characterized in that it comprises the steps of: depositing on at least a portion of the surface of the substrate a layer of a slurry comprising a mixture of foam glass powders, boron oxide, zinc oxide and at least one alkaline metal oxide, in an organic binder, and subjecting the article thereby coated to a thermal firing treatment at a temperature and for a time sufficient to form a substrate adhering coating of a glass material, a glass-ceramic material or a glass and glass-ceramic matrix composite material.
2. The method according to claim 1, characterized in that the said slurry comprises from 40 to 60 weight % of mixture of powders.
3. The method according to claim 1 or 2, characterized in that the mixture of powders comprises the following essential components:
3-20 parts by weight of powdered foam glass,
40-60 parts by weight of boron oxide,
30-40 parts by weight of zinc oxide, and
10-20 parts by weight of sodium oxide, the said parts by weight being referred to 100 parts by weight of the total of the said components. •
4. The method according to any of claims 1 to 3, characterized in that the thermal firing treatment is carried out at a temperature of from 500 to 650 0C.
5. The method according to any of claims 1 to 3, characterized in that the thermal firing treatment is carried out at a temperature which is not higher than the glass transition temperature of the foam glass substrate.
6. A foam glass article, comprising a foam glass substrate provided with a protective and/or finishing coating, characterized in that the said coating is made of a glass material, a glass-ceramic material or a glass and glass- ceramic matrix composite material made of a mixture of foam glass powders, boron oxide, zinc oxide and at least one alkaline metal oxide.
7. The foam glass article according to claim 6, characterized in that the said coating material has a glass transition temperature which is lower than or substantially the same as the glass transition temperature of the foam glass substrate to which the coating is applied.
8. The foam glass article according to claim 6 or 7, characterized in that the said coating material has a linear coefficient of thermal expansion which is lower than or the same as the glass transition temperature of the foam glass substrate to which the coating is applied.
9. The foam glass article according to claim 8, characterized in that the said coating material has a linear coefficient of thermal expansion which is not lower than the 10% of the linear coefficient of thermal expansion of the foam glass substrate to which the coating is applied.
10. The foam glass article according to any of claims 6 to
9, characterized in that the said mixture contains 3 to 20 parts by weight of powdered foam glass.
11. The foam glass article according to any of claims 6 to
10, characterized in that the said coating is formed of a mixture comprising as the essential components:
3-20 parts by weight of powdered foam glass,
40-60 parts by weight of boron oxide,
30-40 parts by weight of zinc oxide, and
10-20 parts by weight of sodium oxide, the said parts by weight being referred to 100 parts by weight of the total of the said components.
12. The foam glass article according to any of claims 6 to
11, characterized in that the said mixture comprises further ingredients selected from the group consisting of fluidizing agents, alkaline or alkaline-earth metal oxides, pigments, dyes and combinations thereof.
13. The foam glass article according to any of claims 6 to
12, characterized in that the said mixture is free of lead oxide.
14. The foam glass article according to any of claims 6 to
13, characterized in that the said mixture comprises foam glass having the same physical and/or chemical characteristics as the foam glass substrate.
15. The foam glass article according to any of claims 6 to 14 obtainable by the method according to any of claims 1 to 5.
EP05822283A 2004-12-02 2005-12-02 A method of preparing coated foam glass articles and articles thereby obtained Withdrawn EP1831122A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20040853 ITTO20040853A1 (en) 2004-12-02 2004-12-02 PROCEDURE FOR THE PREPARATION OF COVERED CELL GLASS ITEMS AND OBTAINED ITEMS.
PCT/IB2005/054013 WO2006059306A1 (en) 2004-12-02 2005-12-02 A method of preparing coated foam glass articles and articles thereby obtained

Publications (1)

Publication Number Publication Date
EP1831122A1 true EP1831122A1 (en) 2007-09-12

Family

ID=36000905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05822283A Withdrawn EP1831122A1 (en) 2004-12-02 2005-12-02 A method of preparing coated foam glass articles and articles thereby obtained

Country Status (3)

Country Link
EP (1) EP1831122A1 (en)
IT (1) ITTO20040853A1 (en)
WO (1) WO2006059306A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012007827A1 (en) 2010-07-13 2012-01-19 Ori Yekutiel Foam glass manufacturing and applications
CN114538781A (en) * 2021-12-28 2022-05-27 海南大学 Foam glass ceramics and preparation method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60166239A (en) * 1984-02-08 1985-08-29 Nippon Sheet Glass Co Ltd Laminated foam glass
GB2188926B (en) * 1986-03-10 1990-08-08 Central Glass Co Ltd Foam glass having crust layer and method of producing same
GB2203143B (en) * 1987-03-20 1991-06-05 Central Glass Co Ltd Multilayer foam glass with dense glass surface layer and method of producing same
JPS63233020A (en) * 1987-03-20 1988-09-28 Central Glass Co Ltd Multifoam glass body and its production

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006059306A1 *

Also Published As

Publication number Publication date
WO2006059306A8 (en) 2006-09-14
WO2006059306A1 (en) 2006-06-08
ITTO20040853A1 (en) 2005-03-02

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