A transparent micro-ceramic glass plate and its production process

Abstract

The present invention relates to the technical field of glass materials, and in particular to a transparent microcrystalline glass plate and a production process thereof. The transparent microcrystalline glass is composed of the following raw materials, in terms of weight percentage: Li2O: 2.8-4.0wt%; Al2O3: 18-22wt%; MgO: 2-5wt%; SnO2: 1.5-2.5wt%; BaO: 0.8-1.5wt%; Y2O3: 2-4wt%; Sb2O3: 0.6-1.0wt%; RO: 1.8-2.5wt%; sintering aid: 0.5-0.8wt%; coloring agent: 0.25 ~0.45wt%; nucleating agent: 4~6.5wt%; clarifier: 0.5~0.8wt%; the balance is SiO2; the transparent microcrystalline glass plate produced by the present invention has the advantages of high transparency, high heat shock temperature resistance, strong mechanical properties and low thermal expansion coefficient, which effectively guarantees the quality and quality of the transparent microcrystalline glass plate produced; in addition, the transparent microcrystalline glass plate produced by the present invention is suitable for manufacturing induction cooker plates / plates, microwave oven plates / plates, kitchen gas stove plates, fireplace glass, grilling plates, frying pans and various heat-resistant utensils, etc., and has a wide range of uses and good market value.

Description

Technical Field

[0001] The present invention relates to the technical field of glass materials, and in particular to a transparent microcrystalline glass plate and a production process thereof. Background Art

[0002] Glass-ceramics is a mixture of microcrystals and glass, made by sintering and crystallizing appropriate glass particles. Its texture is hard, dense, and uniform, and its production process is pollution-free, and the product itself is free of radioactive contamination, making it a new type of environmentally friendly green material.

[0003] Glass-ceramic combines the properties of both glass and ceramic, with its surface texture more closely resembling that of ceramic. It is brighter than ceramic and more resilient than glass. Natural stones like marble and granite have rough surfaces that easily harbor dirt and grime, but glass-ceramic eliminates this problem. Marble, primarily composed of calcium carbonate, reacts chemically with water and carbon dioxide in the air, which is why marble structures discolor over time. Glass-ceramic, however, is virtually unreactive with air, ensuring a long-lasting, durable appearance. Compared to natural stone, glass-ceramic decorative panels also offer advantages such as uniform strength, simpler processing, and lower cost.

[0004] At present, the glass panels on induction cookers, microwave ovens, light wave ovens, and electric ceramic stoves that are popular among consumers are made of transparent microcrystalline glass plates. Although they have the advantages of chemical corrosion resistance and good wear resistance, their own mechanical properties are relatively insufficient and their thermal expansion coefficient is relatively large, which to a certain extent affects the service life and quality of transparent microcrystalline glass plate products.

[0005] Therefore, the present invention provides a transparent microcrystalline glass plate and a production process thereof, which are used to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a transparent microcrystalline glass plate and its production process. The produced transparent microcrystalline glass plate not only has the advantages of high transparency, high heat shock resistance temperature, good mechanical properties and low thermal expansion coefficient, but also has a wide range of uses and good market value.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A transparent microcrystalline glass plate, which is composed of the following raw materials in weight percentage: Li2O: 2.8-4.0wt%; Al2O3: 18-22wt%; MgO: 2-5wt%; SnO2: 1.5-2.5wt%; BaO: 0.8-1.5wt%; Y2O3: 2-4wt%; Sb2O3: 0.6-1.0wt%; RO: 1.8-2.5wt%; sintering aid: 0.5-0.8wt%; colorant: 0.25-0.45wt%; nucleating agent: 4-6.5wt%; clarifier: 0.5-0.8wt%; and the balance is SiO2.

[0009] Furthermore, the RO is any one of CaO and ZnO.

[0010] Furthermore, the sintering aid is prepared by mixing Na2O and K2O in a mass ratio of 1.5 to 2:1.

[0011] Furthermore, the colorant is prepared by mixing NiO and V2O5 in a mass ratio of 1:1.5-2.

[0012] Furthermore, the nucleating agent is prepared by mixing ZrO2, TiO2 and P2O5 in a mass ratio of 1.2 to 1.5:1 to 2:1.

[0013] Furthermore, the clarifier is prepared by mixing CeO2, NaCl and NH4NO3 in a mass ratio of 1.2-1.8:1:2-2.5.

[0014] A production process for a transparent glass-ceramic plate comprises the following steps:

[0015] Step 1: Prepare the raw materials required for producing transparent glass-ceramics as needed, then transfer the prepared raw materials into a grinding device and grind them evenly; the resulting mixed material is stored and set aside;

[0016] Step 2: The mixed material obtained in step 1 is transferred into a melting furnace for heating and melting; after the mixture is fully melted and clarified, the temperature of the resulting melt is naturally cooled to 1380-1430° C., and then the melt is press-formed into a glass plate using relevant processing equipment; the resulting glass plate is stored for future use;

[0017] Step 3: Lower the temperature of the glass plate obtained in step 2 to 720-780°C, and then perform a crystallization treatment on it; after the crystallization treatment is completed, cut the obtained glass plate into specified sizes as needed; then sequentially undergo grinding and polishing, trimming, inspection, printing or decals, and baking processes; finally, the obtained transparent micro-ceramic glass product is inspected, packaged, and stored.

[0018] Furthermore, in the step 2, when the mixed material is melted, the melting temperature is set to 1630-1680° C., and the melting time is set to 2-4 hours.

[0019] Furthermore, the crystallization process in step three is as follows: firstly, the glass plate is crystallized at a temperature of 720-780° C. for 40-60 minutes, and then crystallized at a temperature of 850-900° C. for 60-80 minutes.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the present invention, ZrO2, TiO2, and P2O5 are used as raw materials for the nucleating agent. They work synergistically with Y2O3, not only having a strong aggregation effect, significantly improving the internal structure of the glass and making it more dense, but also effectively stabilizing the crystal form of ZrO2, accelerating the nucleation rate, and promoting glass nucleation and crystallization. Furthermore, the use of a clarifier composed of CeO2, NaCl, and NH4NO3 makes the crystal phase of the microcrystalline glass more uniform and stable, reduces internal defects in the transparent microcrystalline glass, and significantly improves the hardness and mechanical properties of the transparent microcrystalline glass. Furthermore, the transparent microcrystalline glass plate produced by the present invention also has the advantages of high transparency, high thermal shock resistance temperature, excellent mechanical properties, and a low thermal expansion coefficient, effectively ensuring the quality and quality of the produced transparent microcrystalline glass plate.

[0022] In addition, the transparent microcrystalline glass plate produced in the present invention is suitable for manufacturing induction cooker plates / plates, microwave oven plates / plates, kitchen gas stove plates, fireplace glass, grilling plates, frying pans and various heat-resistant utensils, etc. It has a wide range of uses and has good market value. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] Example 1

[0025] A transparent microcrystalline glass plate, comprising the following raw materials, calculated by weight percentage: Li2O: 2.8wt%; Al2O3: 18wt%; MgO: 2wt%; SnO2: 1.5wt%; BaO: 0.8wt%; Y2O3: 2wt%; Sb2O3: 0.6wt%; CaO: 1.8wt%; sintering aid: 0.5wt%; coloring agent: 0.25wt%; nucleating agent: 4wt%; clarifier: 0.5wt%; the balance being SiO2; wherein,

[0026] The sintering aid is prepared by mixing Na2O and K2O in a mass ratio of 1.5:1;

[0027] The coloring agent is prepared by mixing NiO and V2O5 in a mass ratio of 1:1.5;

[0028] The nucleating agent is prepared by mixing ZrO2, TiO2 and P2O5 in a mass ratio of 1.2:1:1;

[0029] The clarifier is prepared by mixing CeO2, NaCl and NH4NO3 in a mass ratio of 1.2:1:2;

[0030] A production process for a transparent glass-ceramic plate comprises the following steps:

[0031] Step 1: Prepare the raw materials required for producing transparent glass-ceramics as needed, then transfer the prepared raw materials into a grinding device and grind them evenly; the resulting mixed material is stored and set aside;

[0032] Step 2: The mixed material obtained in step 1 is transferred into a furnace for heating and melting; after it is fully melted and clarified, the temperature of the resulting melt is naturally cooled to 1380° C., and then the melt is press-formed into a glass plate using relevant processing equipment; the resulting glass plate is stored for future use;

[0033] Step 3: Lower the temperature of the glass plate obtained in step 2 to 720°C and then perform a crystallization treatment on it; after the crystallization treatment is completed, cut the obtained glass plate into specified sizes as needed; then sequentially undergo grinding and polishing, trimming, inspection, printing or decals, and baking processes; finally, inspect, package, and store the obtained transparent micro-ceramic glass product.

[0034] In step 2, when the mixed material is melted, the melting temperature is set to 1630° C., and the melting time is set to 2 h.

[0035] The crystallization process in step 3 is as follows: first, the glass plate is crystallized at a temperature of 720° C. for 40 minutes, and then crystallized at a temperature of 850° C. for 60 minutes.

[0036] After testing, the relevant physical parameters of the transparent micro-ceramic glass plate prepared in this embodiment are:

[0037] Linear expansion coefficient (20~700℃): (-4~+4)×10 -7 / ℃;

[0038] Long-term use temperature ≤830℃;

[0039] Thermal shock temperature ≤820℃;

[0040] Impact resistance: A hollow steel ball with a diameter of 5 cm and a weight of 188 g is dropped freely from a height of 15 cm and impacted continuously for 12 times without breaking.

[0041] Example 2

[0042] A transparent microcrystalline glass plate, comprising the following raw materials, calculated by weight percentage: Li2O: 3.5wt%; Al2O3: 20wt%; MgO: 3wt%; SnO2: 2.0wt%; BaO: 1.2wt%; Y2O3: 3wt%; Sb2O3: 0.8wt%; ZnO: 2.2wt%; sintering aid: 0.6wt%; coloring agent: 0.35wt%; nucleating agent: 5.5wt%; clarifier: 0.6wt%; the balance being SiO2; wherein,

[0043] The sintering aid is prepared by mixing Na2O and K2O in a mass ratio of 1.8:1;

[0044] The coloring agent is prepared by mixing NiO and V2O5 in a mass ratio of 1:1.6;

[0045] The nucleating agent is prepared by mixing ZrO2, TiO2 and P2O5 in a mass ratio of 1.4:1.5:1;

[0046] The clarifier is prepared by mixing CeO2, NaCl and NH4NO3 in a mass ratio of 1.5:1:2.3;

[0047] A production process for a transparent glass-ceramic plate comprises the following steps:

[0048] Step 1: Prepare the raw materials required for producing transparent glass-ceramics as needed, then transfer the prepared raw materials into a grinding device and grind them evenly; the resulting mixed material is stored and set aside;

[0049] Step 2: The mixed material obtained in step 1 is transferred into a furnace for heating and melting; after it is fully melted and clarified, the temperature of the resulting melt is naturally cooled to 1400° C., and then the melt is press-formed using relevant processing equipment; the resulting glass plate is stored for future use;

[0050] Step 3: Lower the temperature of the glass plate obtained in step 2 to 750°C and then perform a crystallization treatment on it; after the crystallization treatment is completed, cut the obtained glass plate into specified sizes as needed; then go through the grinding and polishing, trimming, inspection, printing or decaling and baking processes in sequence; finally, inspect, package and store the obtained transparent micro-ceramic glass product.

[0051] In step 2, when the mixed material is melted, the melting temperature is set to 1650° C., and the melting time is set to 3 hours.

[0052] The crystallization process in step 3 is as follows: first, the glass plate is crystallized at a temperature of 750° C. for 50 minutes, and then crystallized at a temperature of 880° C. for 70 minutes.

[0053] After testing, the relevant physical parameters of the transparent micro-ceramic glass plate prepared in this embodiment are:

[0054] Linear expansion coefficient (20~700℃): (-4~+4)×10 -7 / ℃;

[0055] Long-term use temperature ≤840℃;

[0056] Thermal shock temperature ≤820℃;

[0057] Impact resistance: A hollow steel ball with a diameter of 5 cm and a weight of 188 g is dropped freely from a height of 15 cm and impacted continuously for 15 times without breaking.

[0058] Example 3

[0059] A transparent microcrystalline glass plate, comprising the following raw materials, calculated by weight percentage: Li2O: 4.0wt%; Al2O3: 22wt%; MgO: 5wt%; SnO2: 2.5wt%; BaO: 1.5wt%; Y2O3: 4wt%; Sb2O3: 1.0wt%; CaO: 2.5wt%; sintering aid: 0.8wt%; coloring agent: 0.45wt%; nucleating agent: 6.5wt%; clarifier: 0.8wt%; the balance being SiO2; wherein,

[0060] The sintering aid is prepared by mixing Na2O and K2O in a mass ratio of 2:1;

[0061] The coloring agent is prepared by mixing NiO and V2O5 in a mass ratio of 1:2;

[0062] The nucleating agent is prepared by mixing ZrO2, TiO2 and P2O5 in a mass ratio of 1.5:2:1;

[0063] The clarifier is prepared by mixing CeO2, NaCl and NH4NO3 in a mass ratio of 1.8:1:2.5;

[0064] A production process for a transparent glass-ceramic plate comprises the following steps:

[0065] Step 1: Prepare the raw materials required for producing transparent glass-ceramics as needed, then transfer the prepared raw materials into a grinding device and grind them evenly; the resulting mixed material is stored and set aside;

[0066] Step 2: The mixed material obtained in step 1 is transferred into a melting furnace for heating and melting; after the mixture is fully melted and clarified, the temperature of the resulting melt is naturally cooled to 1430° C., and then the melt is press-formed into a glass plate using relevant processing equipment; the resulting glass plate is stored for future use;

[0067] Step 3: Lower the temperature of the glass plate obtained in step 2 to 780°C and then perform a crystallization treatment on it; after the crystallization treatment is completed, cut the obtained glass plate into specified sizes as needed; then go through the grinding and polishing, trimming, inspection, printing or decals and baking processes in sequence; finally, inspect, package and store the obtained transparent micro-ceramic glass products.

[0068] In step 2, when the mixed material is melted, the melting temperature is set to 1680° C., and the melting time is set to 4 hours.

[0069] The crystallization process in step 3 is as follows: first, the glass plate is crystallized at a temperature of 780° C. for 60 minutes, and then crystallized at a temperature of 900° C. for 80 minutes.

[0070] After testing, the relevant physical parameters of the transparent micro-ceramic glass plate prepared in this embodiment are:

[0071] Linear expansion coefficient (20~700℃): (-4~+4)×10 -7 / ℃;

[0072] Long-term use temperature ≤840℃;

[0073] Thermal shock temperature ≤820℃;

[0074] Impact resistance: A hollow steel ball with a diameter of 5 cm and a weight of 188 g is dropped freely from a height of 15 cm and impacted continuously for 13 times without breaking.

[0075] The transparent glass-ceramic sheets produced by the present invention not only have advantages such as high transparency, high thermal shock resistance, excellent mechanical properties, and a low thermal expansion coefficient, but also have a wide range of applications and excellent market value. This demonstrates that the transparent glass-ceramic sheets and their production process provided by the present invention have a broader market prospect and are more suitable for promotion.

[0076] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0077] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A transparent glass-ceramic plate, characterized in that: The transparent microcrystalline glass plate is composed of the following raw materials by weight percentage: Li2O: 2.8-4.0wt%; Al2O3: 18-22wt%; MgO: 2-5wt%; SnO2: 1.5-2.5wt%; BaO: 0.8-1.5wt%; Y2O3: 2-4wt%; Sb2O3: 0.6-1.0wt%; RO: 1.8-2.5wt%; sintering aid: 0.5-0.8wt%; coloring agent: 0.25-0.45wt%; nucleating agent: 4-6.5wt%; clarifier: 0.5- 0.8wt%; the balance is SiO2; the RO is any one of CaO and ZnO; the sintering aid is prepared by mixing Na2O and K2O in a mass ratio of 1.5 to 2:1; the coloring agent is prepared by mixing NiO and V2O5 in a mass ratio of 1:1.5 to 2; the nucleating agent is prepared by mixing ZrO2, TiO2 and P2O5 in a mass ratio of 1.2 to 1.5:1 to 2:1; the clarifier is prepared by mixing CeO2, NaCl and NH4NO3 in a mass ratio of 1.2 to 1.8:1:2 to 2.

5.

2. The production process of the transparent micro-ceramic glass plate according to claim 1, characterized in that: The following steps are involved: Step 1: Prepare the raw materials required for producing transparent glass-ceramics as needed, then transfer the prepared raw materials into a grinding device and grind them evenly; the resulting mixed material is stored and set aside; Step 2: The mixed material obtained in step 1 is transferred into a melting furnace for heating and melting; after the mixture is fully melted and clarified, the temperature of the resulting melt is naturally cooled to 1380-1430° C., and then the melt is press-formed into a glass plate using relevant processing equipment; the resulting glass plate is stored for future use; Step 3: Lower the temperature of the glass plate obtained in step 2 to 720-780°C, and then perform a crystallization treatment on it; after the crystallization treatment is completed, cut the obtained glass plate into specified sizes as needed; then sequentially undergo grinding and polishing, trimming, inspection, printing or decals, and baking processes; finally, the obtained transparent micro-ceramic glass product is inspected, packaged, and stored.

3. The production process of a transparent glass-ceramic plate according to claim 2, characterized in that: In the step 2, when the mixed material is melted, the melting temperature is set to 1630-1680° C., and the melting time is set to 2-4 hours.

4. The production process of a transparent glass-ceramic plate according to claim 3, characterized in that: The crystallization process in step three is as follows: firstly, the glass plate is crystallized at a temperature of 720-780° C. for 40-60 minutes, and then crystallized at a temperature of 850-900° C. for 60-80 minutes.