CN116177880A - Multiphase composite crystal nucleus microcrystalline glass and preparation method thereof - Google Patents

Multiphase composite crystal nucleus microcrystalline glass and preparation method thereof Download PDF

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CN116177880A
CN116177880A CN202310290890.3A CN202310290890A CN116177880A CN 116177880 A CN116177880 A CN 116177880A CN 202310290890 A CN202310290890 A CN 202310290890A CN 116177880 A CN116177880 A CN 116177880A
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glass
crystal nucleus
temperature
nucleus
crystal
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李可明
刘建勇
周尧
杨剑
王静
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Qingdao Ronghe New Material Technology Co Ltd
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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
    • 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
    • C03C10/16—Halogen containing crystalline phase
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/235—Heating the glass
    • 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
    • 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
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dispersion Chemistry (AREA)
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Abstract

The invention discloses multiphase composite crystal nucleus microcrystalline glass and a preparation method thereof, and belongs to the technical field of microcrystalline glass. The technical proposal is as follows: comprises the following components in percentage by mass: 52-66% SiO 2 、10‑18％Al 2 O 3 、2‑8％B 2 O 3 、2‑5％MgO、2‑5％CaO、1‑4％ZnO、0.5‑4％Na 2 O、0.5‑2％K 2 O、0.7‑7％Li 2 O、0.5‑1.5％CaF 2 、0.2‑0.4％KCl、5.5‑8％CaCO 3 、0.1‑0.5％BaCO 3 、1‑5％BaSO 4 、0.1‑1％TiO 2 2-3% of carbon powder. The invention forms three different crystal nucleus structures, namely lithium fluoride baseThe three crystal nuclei form multiphase composite crystal nuclei, and can improve the performances of the glass such as strength, light transmittance and the like.

Description

Multiphase composite crystal nucleus microcrystalline glass and preparation method thereof
Technical Field
The invention relates to the technical field of microcrystalline glass, in particular to multiphase composite crystal nucleus microcrystalline glass and a preparation method thereof.
Background
Glass ceramics are glass having microcrystalline nuclei, which are formed by precipitation of crystals and a crystalline nucleus material in glass during heating.
In recent years, with the rise of smart phones, smart tablet computers, and smart car-mounted industries, functional demands for glass panels have increased, and the desire to obtain high-performance glass ceramics by using chemical strengthening and the like has increased. Chemical strengthening means that the metal ions of various glass raw materials are combined, exchanged, rearranged and combined into new substances at high temperature, and the generation of crystal nuclei in the glass occurs, so that the performance of the glass is improved; the addition of other additives can shorten the melting time of the glass, reduce the melting temperature and improve the light transmittance of the glass. Therefore, a new formulation and preparation process of glass ceramics are needed to be developed through a chemical strengthening mode to prepare high-performance glass ceramics.
Disclosure of Invention
The invention aims to solve the technical problems that: the preparation method comprises the steps of preparing a glass-ceramic with heterogeneous composite crystal nucleus, wherein the glass-ceramic is prepared from glass-ceramic liquid, and the glass-ceramic is prepared from glass-ceramic with heterogeneous composite crystal nucleus.
The technical scheme of the invention is as follows:
on one hand, the invention provides multiphase composite crystal nucleus microcrystalline glass, which comprises the following components in percentage by mass: 52-66% SiO 2 、10-18％Al 2 O 3 、2-8％B 2 O 3 、2-5％MgO、2-5％CaO、1-4％ZnO、0.5-4％Na 2 O、0.5-2％K 2 O、0.7-7％Li 2 O、0.5-1.5％CaF 2 、0.2-0.4％KCl、5.5-8％CaCO 3 、0.1-0.5％BaCO 3 、1-5％BaSO 4 、0.1-1％TiO 2 2-3% of carbon powder.
In the microcrystalline glass material, the super-strong fluxing materials Li2O, caF and CaO can effectively melt glass liquid, so that the viscosity in glass formation can be reduced, glass is easy to melt, and a good fluxing effect is achieved.
BaSO 4 The microcrystalline glass has higher hardness and higher decomposition temperature (1580 ℃), and carbon powder is added to accelerate the decomposition, so the consumption is not more than 5 percent. The insufficient part of BaO can be formed by BaCO 3 Introduction of BaSO 4 The mass requirements of (2) are: baSO (Baso) 4 ≥97％，SiO 2 <1.5％，Fe 2 O 3 <0.1％。
BaCO 3 Is decomposed strongly and emits CO 2 So that the glass liquid is clarified rapidly. The mass requirements for barium carbonate are: baCO 3 ≥98％，Fe2O3<0.03%, acid insoluble matter<2％。
K 2 Action of O and Na 2 O is similar, and can prolong the glass material property and enhance the gloss and the transparency of the glass. When the glass is melted, the color of the glass is more transparent. K in glass 2 O is usually composed of potash (K) having a specific gravity of 2.29 2 CO 3 ) Introduced into the reactor and contains trace Na 2 CO 3 、K 2 SO 4 Impurities such as KCl can be melted.
MgO has similar effect in glass as CaO, and the MgO is used to replace partial CaO, so that the melting and clarification of the glass can be accelerated, the forming performance of the glass can be improved, the crystallization tendency of the glass can be reduced, and the thermal stability of the glass can be improved.
On the other hand, the invention also provides a preparation method of the multiphase composite crystal nucleus microcrystalline glass, which comprises the steps of adding all components of the microcrystalline glass into a reaction container to start heating and melting, and preserving heat for 10+/-2 s when the temperature is raised to 650+/-5 ℃ in the heating process; in the process, generating zinc titanate base crystal nucleus, namely TiO 2 +ZnO＝ZnTiO 3 . In the glass ceramics, as shown in FIG. 2, znTiO is produced 3 The crystal nucleus molecules are basically spherical, the particle size distribution is very narrow, the ion distribution is relatively uniform, and the particle clusters are formedThe aggregation phenomenon is less, the cohesiveness is stronger, the light transmittance is better, the crystal phase gaps of the microcrystalline glass can be reduced, the density of the composite crystal phase is improved, and the bonding filling among the crystal nucleus agents is compact.
Continuously heating to 848+/-10 ℃, and preserving the temperature for 15+/-2 s; in the process, generating lithium fluoride-based crystal nucleus, namely Na 2 O+CaF 2 +SiO 2 ＝4NaOH+Na 2 SiF6+6NaF，NaF+Li 2 O+H 2 O=lif+naoh+4na. In the glass ceramics, as shown in FIG. 3, the LiF crystal nuclei are flocculent, and Li in the LiF crystal nuclei + Capable of replacing Si in silicon oxygen tetrahedron 4+ ，F - Can replace O 2- Thereby destroying the silicon oxygen tetrahedron structure, reducing the viscosity of glass liquid, being beneficial to melting glass and increasing the instability of base glass, and being beneficial to the infiltration of other crystal nucleus. In the heat treatment process, lithium and fluorine are separated out from the glass matrix, so that the phase of the base glass is separated, the nucleation and crystallization temperature of the microcrystalline glass can be reduced, and the crystallization of the microcrystalline glass is promoted; meanwhile, after the lithium fluoride base crystal nucleus and other two crystal nuclei form a composite crystal nucleus, the density, the flexural strength and the fracture toughness of the microcrystalline glass can be further improved.
Then continuously heating to 950+/-5 ℃, and preserving heat for 10+/-5 s; in the process, zinc silicate base crystal nucleus, namely ZnO+SiO is generated 2 ＝Zn 2 SiO 4 。Zn 2 SiO 4 The crystal nucleus can mainly reduce the melting temperature of the glass raw material; on the other hand, as shown in FIG. 1, zn 2 SiO 4 The crystal nucleus is lamellar and needle-shaped, the crystal grains grow compactly and have no obvious pores, polygonal structures are arranged among the crystal grains, the strength of the crystal grains is higher, the density of the glass solution with higher quality is higher, and the glass-ceramic density is improved.
Formation of heterogeneous composite crystal nucleus glass solution: sodium silicate, calcium silicate and a large amount of silica sand generated in the silicate forming stage are mutually dissolved and diffused when the temperature is continuously increased, an opaque semi-molten sinter is converted into transparent glass liquid, and lithium fluoride-based crystal nucleus, zinc titanate-based crystal nucleus and zinc silicate-based crystal nucleus generated before are formed into multiphase composite crystal nucleus (lithium titanate zinc acid crystal nucleus) and are fused into glass, so that multiphase composite crystal nucleus glass solution is formed, nano crystal nuclei are arranged in multiple ways, and the crystallization performance, density, light transmittance and strength of the microcrystalline glass are improved.
The grain size of the crystallized glass ceramics after the high crystallization can be controlled within tens of nanometers, and the superfine multi-state structure is obtained. In the lithium-based aluminum titanium zinc silicon transparent microcrystalline glass, a large amount of lithium titanium zinc acid crystal nuclei are formed in the base glass due to sufficient nuclear fusion, and beta-quartz solid solution crystal phases are epitaxially grown on the crystal nuclei to form uniform ultrafine grain structures with average grain sizes of about 60 nm. The grain size is far smaller than the wavelength of visible light, and the double refractive index of the beta-quartz solid solution is low, so that the light transmittance of the finally prepared microcrystalline glass is high.
As can be seen from fig. 4, the glass ceramics with spherical, lamellar/needle-like and flocculent multi-state interlocking microstructures have structural characteristics similar to those of mutually complementary arrangements, and have compact structures, so that the glass ceramics has higher strength and strong fracture resistance. The breaking strength of the glass ceramics reaches 179.3Mpa, and the fracture toughness reaches 5.12 mpa.m.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, three different crystal nucleus structures, namely lithium fluoride base crystal nucleus, zinc titanate base crystal nucleus and zinc silicate base crystal nucleus, are formed in glass liquid through the formulation of microcrystalline glass and the staged control of melting temperature, and the three crystal nuclei form multiphase composite crystal nuclei, so that the performances of glass such as light transmittance and the like can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a diagram showing the structure of the crystal phase of the zinc titanate-based nucleus of example 1 of the present invention.
FIG. 2 is a diagram showing the structure of the crystal phase of the lithium fluoride-based nucleus of example 1 of the present invention.
FIG. 3 is a diagram showing the structure of the crystal phase of the zinc silicate-based nucleus of example 1 of the present invention.
FIG. 4 is a diagram showing the structure of the crystal phase of the multiphase composite crystal nucleus according to example 1 of the present invention.
FIG. 5 is a diagram showing the structure of the crystal phase of the zinc titanate-based nucleus of example 3 of the present invention.
FIG. 6 is a diagram showing the structure of the crystal phase of the lithium fluoride-based nucleus of example 3 of the present invention.
FIG. 7 is a diagram showing the structure of the crystal phase of the zinc silicate-based nucleus of example 3 of the present invention.
FIG. 8 is a diagram showing the structure of the crystal phase of the multiphase composite crystal nucleus according to example 3 of the present invention.
FIG. 9 is a diagram showing the structure of the crystal phase of the zinc titanate-based nucleus of example 5 of the present invention.
FIG. 10 is a diagram showing the structure of the crystal phase of the lithium fluoride-based nucleus of example 5 of the present invention.
FIG. 11 is a diagram showing the structure of the crystal phase of the zinc silicate-based nucleus of example 5 of the present invention.
FIG. 12 is a diagram showing the structure of the crystal phase of the multiphase composite crystal nucleus according to example 5 of the present invention.
Detailed Description
In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The microcrystalline glass in the following examples comprises the following components in percentage by mass: 52-66% SiO 2 、10-18％Al 2 O 3 、2-8％B 2 O 3 、2-5％MgO、2-5％CaO、1-4％ZnO、0.5-4％Na 2 O、0.5-2％K 2 O、0.7-7％Li 2 O、0.5-1.5％CaF 2 、0.2-0.4％KCl、5.5-8％CaCO 3 、0.1-0.5％BaCO 3 、1-5％BaSO 4 、0.1-1％TiO 2 2-3% of carbon powder.
The preparation method of the microcrystalline glass comprises the following steps:
adding all components of the microcrystalline glass into an inclined blanket type thin layer batch feeder to start heating and melting, and preserving heat for 10+/-2 s when the temperature is raised to 650+/-5 ℃ in the heating process; continuously heating to 848+/-10 ℃, and preserving the temperature for 15+/-2 s; and (5) continuously heating to 950+/-5 ℃, and preserving the temperature for 10+/-5 s. The microcrystalline glass batch is put into a glass kiln from a scraping type batch feeder, the spreading surface of the batch is increased, and the batch feeding amount of the scraping type batch feeder is controlled by a process, so that different batch feeding amounts and batch feeding interval time are regulated; and the glass ceramics are preserved for different time in different temperature areas, so that the microcrystalline nuclei are fully reacted and generated, and the melting capacity of the glass ceramics is improved.
Examples 1 to 7
The glass-ceramic batch recipes for examples 1-7 are shown in Table 1:
TABLE 1
Figure BDA0004141393610000041
Figure BDA0004141393610000051
The parameter settings during the temperature rise of the glass ceramics of examples 1 to 7 are shown in Table 2:
TABLE 2
Zinc titanate-based nucleation Lithium fluoride-based nucleation Zinc silicate-based nucleation
Example 1 Heat preservation for 10s when the temperature is raised to 650 DEG C Heat preservation for 15s when the temperature is raised to 848 DEG C Heating to 950 DEG CThermal insulation for 10s
Example 2 Heat preservation for 12s when the temperature is raised to 650 DEG C Heat preservation for 15s when the temperature is raised to 850 DEG C Heat preservation for 13s when heating to 950 DEG C
Example 3 Heat preservation for 10s when the temperature is raised to 650 DEG C Heating to 848 deg.C, and maintaining for 14s Heat preservation for 15s when heating to 945 DEG C
Example 4 Heat preservation for 10s when the temperature is raised to 650 DEG C Heat preservation for 17s when heating to 838 DEG C Heating to 948 deg.C, and maintaining for 12s
Example 5 Heat preservation for 8s when the temperature is raised to 650 DEG C Heat preservation for 13s when heating to 858 DEG C Heating to 952 deg.C, and maintaining for 8s
Example 6 Heat preservation for 9s when the temperature is raised to 645 DEG C Heat preservation for 16s when the temperature is raised to 848 DEG C Heating to 955 deg.C, and maintaining for 5s
Example 7 Heating to 655 deg.C, preserving heat for 12s Heat preservation for 17s when the temperature is raised to 840 DEG C Heating upHeat preservation for 10s at 950 DEG C
Among them, the structures of zinc titanate-based nuclei, lithium fluoride-based nuclei, zinc silicate-based nuclei and heterogeneous composite nuclei (lithium titanate-zinc acid nuclei) generated in the preparation of glass-ceramics of examples 1, 3 and 5 are shown in FIGS. 1 to 12. As can be seen from the figure, the zinc titanate-based crystal nucleus molecules are basically spherical, the particle agglomeration phenomenon is less, and the cohesiveness is stronger; the lithium fluoride base crystal nucleus is flocculent; the zinc silicate base crystal nucleus is lamellar and needle, the crystal grain grows compactly and has no obvious pore, and the crystal grain has a polygonal structure.
In addition, the glass ceramics prepared in examples 1 to 7 were subjected to performance test, and the test results are shown in Table 3:
TABLE 3 Table 3
Figure BDA0004141393610000061
As can be seen from Table 3, the glass ceramics prepared by the invention has high strength, strong fracture resistance and high light transmittance, wherein the fracture strength reaches 179.3Mpa, and the fracture toughness reaches 5.12 mpa.m.
Comparative example 1
The difference from example 1 is that: in the zinc titanate base crystal nucleus generation stage, when the temperature is raised to 650 ℃, the heat is not preserved, and the heating is continuously carried out.
Comparative example 2
The difference from example 3 is that: in the generation stage of lithium fluoride base crystal nucleus, when the temperature is raised to 848 ℃, the heat is not preserved, and the heating and the temperature rising are continuously carried out.
Comparative example 3
The difference from example 5 is that: in the zinc silicate base crystal nucleus generation stage, when the temperature is raised to 952 ℃, the heat is not preserved, and the heating and the temperature rising are continuously carried out.
The results of the glass-ceramic performance test of comparative examples 1 to 3 are shown in Table 4:
TABLE 4 Table 4
Figure BDA0004141393610000062
Figure BDA0004141393610000071
As can be seen from table 4, since comparative example 1 was not kept at 650 ℃ for a while, but was continuously heated up, zinc titanate-based nuclei could not be generated, thereby reducing the light transmittance of the glass-ceramic; since comparative example 2 was not kept at 848 ℃ for a while, but was continuously heated up, lithium fluoride-based nuclei could not be generated; since comparative example 3 was not kept at 952 ℃ for a while, but was continuously heated up, zinc silicate-based nuclei could not be generated, resulting in a glass ceramic having a lower density than that of example 5; meanwhile, as multiphase composite crystal nucleus (lithium titanate zinc acid crystal nucleus) cannot be formed in comparative examples 1-3, the density and strength of the microcrystalline glass are also reduced.
According to the embodiment and the comparative example, in the process of preparing microcrystalline glass, heat is preserved for a certain time in different temperature areas, and three crystal nuclei with different structures can be correspondingly generated: lithium fluoride-based nuclei, zinc titanate-based nuclei, and zinc silicate-based nuclei. The three crystal nuclei can form multiphase composite crystal nuclei (lithium titanate zinc acid crystal nuclei) and are melted into glass to form multiphase composite crystal nucleus glass solution, and the nano crystal nuclei are arranged in multiple ways, so that the crystallization performance of the microcrystalline glass is improved, the density is increased, the light transmittance is increased, and the strength is increased.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (2)

1. The multiphase composite crystal nucleus microcrystalline glass is characterized by comprising the following components in percentage by mass: 52-66% SiO 2 、10-18％Al 2 O 3 、2-8％B 2 O 3 、2-5％MgO、2-5％CaO、1-4％ZnO、0.5-4％Na 2 O、0.5-2％K 2 O、0.7-7％Li 2 O、0.5-1.5％CaF 2 、0.2-0.4％KCl、5.5-8％CaCO 3 、0.1-0.5％BaCO 3 、1-5％BaSO 4 、0.1-1％TiO 2 2-3% of carbon powder.
2. The process for preparing heterogeneous composite nucleus microcrystalline glass according to claim 1, wherein each component of microcrystalline glass is added into a reaction vessel to start heating and melting, and the temperature is kept for 10+ -2 s when the temperature is raised to 650+ -5 ℃ during the heating process; continuously heating to 848+/-10 ℃, and preserving the temperature for 15+/-2 s; and (5) continuously heating to 950+/-5 ℃, and preserving the temperature for 10+/-5 s.
CN202310290890.3A 2023-03-23 2023-03-23 Multiphase composite crystal nucleus microcrystalline glass and preparation method thereof Pending CN116177880A (en)

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