70 results about "Lithium disilicate" patented technology

The invention discloses a glass ceramic and a preparation method thereof, and an electronic equipment cover plate and an electronic equipment cover plate assembly prepared from the glass ceramic, the overall crystallinity of the glass ceramic is 60%-95%, the crystalline phase is lithium disilicate and petalite, and the weight ratio of the lithium disilicate crystalline phase to the petalite crystalline phase is greater than or equal to 1.5. The microcrystalline glass provided by the invention has specific glass composition and crystalline phase structure, and by utilizing the synergistic effect of the glass composition and the high lithium disilicate crystalline phase structure, not only is the microcrystalline glass product endowed with high elastic modulus, but also the microcrystalline glass product can obtain an expected stress structure after chemical strengthening treatment; particularly, the high center tensile stress (CT-CV) and the large average tensile stress (CT-AV) are achieved.

A method for manufacturing a lithium disilicate glass ceramic with gradient properties by using photocuring additive manufacturing, the method comprising: performing wet mixing on a basic glass powder with a solvent, ball milling same until uniformity, drying same, then performing thermal treatment to reach a molten state, then quenching same to form original particles, and then granulating same to obtain lithium disilicate ceramic particles; respectively preparing n groups of pastes with gradually-changing colors and translucencies from n groups of the lithium disilicate ceramic particles, said paste preparation comprising: adding 3Y-TZP powder, a coloring agent and lithium disilicate ceramic particles to a resin mixture, mixing same, rolling same and performing vacuum defoaming to obtain a paste; adding the n groups of pastes in sequence into an additive manufacturing device to undergo photocuring forming, so as to obtain a green body; after the green body is cleaned and dried, degreasing the green body, and sintering same; and finally under a vacuum high-temperature condition, subjecting the sintered sample to an ion exchange reaction with a molten nitrate in a flowing state, so as to obtain a product.

The application provides a chemically strengthened microcrystalline glass, a cover plate glass, an electronic device and a glass device, and belongs to the technical field of microcrystalline glass. The application makes the surface composition and stress structure of the chemically strengthened microcrystalline glass with lithium disilicate as the main crystal phase meet specific requirements, so that the chemically strengthened microcrystalline glass can meet high stress levels and also ensure good weather resistance, and can better ensure that the chemically strengthened microcrystalline glass meets application requirements.

The application provides a chemically strengthened microcrystalline glass, a cover plate glass, an electronic device and a glass device, and belongs to the technical field of microcrystalline glass; through the high lithium content microcrystalline glass with a specific composition and taking lithium disilicate as a main crystal phase, after chemical strengthening treatment, specific stress characteristics are met, especially the relationship between the molar percentage content of ZrO2 in the microcrystalline glass and the stress characteristic relationship A meets specific requirements, that is, the range requirement of the relationship B is met, not only can the problem of "surface cracking" of the prepared chemically strengthened microcrystalline glass be effectively overcome, but also the chemically strengthened microcrystalline glass can be ensured to have high mechanical strength performance, and further the chemically strengthened microcrystalline glass can be ensured to have excellent damage resistance.

Glass and glass-ceramic compositions having a combination of lithium silicate and petalite crystalline phases are described, as well as methods of making the glass and glass-ceramic compositions. The compositions are compatible with conventional rolling and float processes, are transparent or translucent, and have high mechanical strength and fracture resistance. In addition, the compositions can be chemically tempered into glass-ceramics of even higher strength, which can be used as large substrates in a variety of applications.

Provided are a lithium disilicate glass-ceramic green body, a preparation method therefor, and a use thereof. The lithium disilicate glass-ceramic green body comprises a lithium disilicate main crystal phase, crystal size in the lithium disilicate glass-ceramic blank being between 50 and 400 nm, and the proportion of the area of crystal grains having a length greater than 350 nm to the total area being less than 30%. The present disclosure, by means of controlling the internal crystal size of the lithium disilicate glass-ceramic green body to be below 400 nm, enables same to be directly machined without damaging the machining equipment, and combines the advantages of high strength, machinability and direct coloration. This can reduce the waiting time for patients to receive dental restorations, solve the problem of patients being unable to know the color of all-ceramic dentures before fabrication, and overcome a bottleneck for all-ceramic denture restoration materials for same-day delivery. It has great significance for achieving preoperative color matching and rapid restoration in clinical practice.

The invention relates to microcrystalline glass as well as a method and application for improving ion exchange performance of the microcrystalline glass. The preparation method comprises the following steps: firstly, carrying out Na-Li ion exchange on uncrystallized Li-containing glass by using Na-containing molten salt, then carrying out heat treatment to crystallize the Li-containing glass to obtain microcrystalline glass of which the surface layer only contains a lithium disilicate crystal phase and the interior contains lithium disilicate and petalite crystal phases, and finally, carrying out K-Na ion exchange on the microcrystalline glass by using K-containing molten salt to obtain the lithium-ion-doped microcrystalline glass of which the surface layer only contains a lithium disilicate crystal phase and the interior contains lithium disilicate and petalite crystal phases. The surface pressure stress of the high-performance glass ceramic product is not lower than 400 MPa, the depth of an ion exchange layer is not lower than 6 microns, and the Vickers hardness is not lower than 800 kgf / mm < 2 >. The ion exchange performance, especially the K-Na ion exchange performance, of the microcrystalline glass is effectively improved, stress fringes of the prepared microcrystalline glass product can be observed through a stress meter, and the K-Na ion exchange effect of the microcrystalline glass product can be accurately measured and evaluated; the method has a good application prospect in electronic display equipment such as a mobile phone and intelligent wearable terminals such as a watch.

The present disclosure belongs to the technical field of glass ceramic materials, and particularly relates to 3D hot-bendable glass ceramic, and a preparation method therefor and the use thereof. The present disclosure provides 3D hot-bendable glass ceramic, which comprises a petalite crystal phase, a lithium disilicate crystal phase and a quartz crystal phase. The total crystal phase content of the 3D hot-bendable glass ceramic is 40%-70%, wherein the sum of the content of the petalite crystal phase and the lithium disilicate crystal phase accounts for 50%-70% of the content of the total crystal phase, and the content of the quartz crystal phase accounts for 4%-10% of the content of the total crystal phase. In the present disclosure, by controlling the 3D hot-bendable glass ceramic to comprise a petalite crystal phase, a lithium disilicate crystal phase and a quartz crystal phase before hot bending, and controlling the proportion of each crystal phase to be within an appropriate range, the glass ceramic exhibits a pleasant white appearance, and it is ensured that same can be subjected to 3D hot bending forming at 810°C, so that the 3D glass ceramic can be prepared, and a three-dimensional product can be machined.

Provided are a reinforced microcrystalline glass with good monomer strength and a good drop resistance performance, a glass device and an electronic apparatus. The reinforced microcrystalline glass comprises a compressive stress layer and a tensile stress layer, main crystalline phases of the reinforced microcrystalline glass comprise a petalite crystalline phase and a lithium disilicate crystalline phase; and the reinforced microcrystalline glass satisfies: surface CS≥400 MPa; surface CS / |CTAV|≥17.00, where |CT_AV| is the absolute value of the average tensile stress in the tensile stress layer, and the unit is MPa; and DOL_0≥0.15 t, where DOL_0 refers to the depth of the compressive stress layer, and t refers to the thickness of the reinforced microcrystalline glass.

Disclosed herein are glass-ceramics that may include a phase assemblage including: 35 wt % to 60 wt % of a petalite crystalline phase; 20 wt % to 60 wt % of a lithium disilicate crystalline phase; and 5 wt % to 20 wt % of a residual amorphous glass phase. The glass-ceramics may further include copper metal nanoparticles dispersed in the residual amorphous glass phase. The glass-ceramics may appear red in color and comprises transmittance color coordinates in CIE LAB color space of: L* greater than or equal to 0 and less than or equal to 100; a* greater than or equal to −23 and less than or equal to 62; and b* greater than or equal to −10 and less than or equal to 60.5 at an article thickness of 0.55 mm for a CIE illuminant D65 under SCI UVC conditions and a 10 degree observer angle.

The application provides a cuttable lithium disilicate glass ceramic blank and a preparation method and application thereof, the lithium disilicate glass ceramic blank comprises lithium disilicate crystals and lithium metasilicate crystals, the lithium disilicate crystals comprise spherical lithium disilicate crystals and rod-shaped lithium disilicate crystals, and the lithium metasilicate crystals comprise spherical lithium metasilicate crystals; the cuttable lithium disilicate glass ceramic blank has high strength, does not need one-step sintering, and can be directly cut, so that the dental treatment time can be shortened, and a dentist can conveniently judge the repair effect before operation, which has important significance for improving the repair effect of teeth and the diagnosis and treatment experience of patients.

Glass-ceramic, chemically strengthened glass-ceramic, cover plate glass, and an electronic device, relating to the technical field of glass-ceramic. The glass-ceramic satisfies a specific composition and crystalline phase structure, so that the contents of components of the glass-ceramic and the ratio relationship between the contents of the components satisfy specific ranges, and Na2O, B2O3, ZrO2, or Li2O satisfy a specific molar percentage relationship. In addition, the glass-ceramic satisfies the condition that lithium disilicate acts as a main crystalline phase, so that the glass-ceramic can not only be endowed with excellent optical performance and a high intrinsic strength but can also be quickly and efficiently prepared into chemically strengthened glass-ceramic having a relatively high stress level and a relatively high mechanical strength under conventional chemical strengthening process conditions.

The present invention relates to a method for manufacturing a high-transmittance lithium disilicate glass ceramic by means of photocuring additive manufacturing, comprising: adding anhydrous ethanol to prepared powder, carrying out ball milling for uniform mixing and then drying the mixture, and carrying out heat treatment to obtain a molten mixture; dropwise adding the molten mixture to flowing deionized water for quenching to form initial particles; ball-milling and sieving the initial particles to prepare powder having a particle size of 0.3-0.5 μm and carrying out spray drying granulation to obtain 5-25 μm glass ceramic particles; adding the glass ceramic particles to a prepared resin mixture, putting the obtained mixture into a roller press to prepare a paste, and then carrying out vacuum defoaming; carrying out photocuring formation on the paste by means of an additive manufacturing device to obtain a green body; using a flowing cleaning solution to clean the green body and then drying the green body; and degreasing the dried green body in vacuum or an inert gas, then carrying out vacuum impregnation in a lithium polysilicate solution, and then carrying out sintering and ion exchange to obtain a finished product. The present invention solves the problem of insufficient strength or low light transmittance of a lithium disilicate glass ceramic obtained by additive manufacturing.

This invention relates to the field of glass-ceramic materials, and discloses a glass-ceramic, its preparation method, and its applications. Based on the total mass of the glass-ceramic, it comprises: 11-18 wt.% α-quartz phase, 47-55 wt.% lithium feldspar phase, 22-31 wt.% lithium disilicate phase, and 6-13 wt.% glass phase; the glass-ceramic has a Vickers hardness ≥670 HV and a haze ≥90%. This invention starts from the design of the material's microstructure. Through the synergistic effect of the various components of the crystalline and glass phases, the glass-ceramic achieves bulk light-shielding through internal crystallization. Simultaneously, the α-quartz reinforcing phase forms a dispersed strengthening effect, effectively hindering dislocation and crack propagation. This results in the glass-ceramic of this invention possessing both extreme light-shielding properties and high hardness.

The invention discloses a fluorescent glass ceramic membrane with high color temperature uniformity and a preparation method and application thereof, and belongs to the technical field of laser illumination and display. A preparation method of a fluorescent glass ceramic membrane with high color temperature uniformity comprises the following steps: S1, uniformly mixing lithium disilicate glass powder, garnet fluorescent powder and an organic solvent to obtain slurry, and coating a substrate with the slurry to obtain an intermediate material; and S2, carrying out two-step heat treatment on the intermediate material to obtain the fluorescent glass ceramic membrane with high color temperature uniformity. The lithium disilicate glass forms an interlocking microcrystalline network structure in the fluorescent glass ceramic through two-step heat treatment by utilizing a nucleation crystallization mechanism of the lithium disilicate glass. The lithium disilicate glass with the microcrystalline interlocking network structure not only can ensure the compactness of a fluorescent glass ceramic film, but also can provide a scattering medium for blue laser, so that the scattering effect of the blue laser in a fluorescent conversion layer is remarkably improved, and the color temperature uniformity of white laser is further improved.

A glass-ceramic article comprises silica, lithia, phosphorus pentoxide, and zirconia in amounts that, when heat treated, provide a glass-ceramic including a lithium disilicate (Li2Si2O5) crystalline phase. The glass-ceramic may have high fracture toughness, transparency, hardness, and may be strengthen via ion-exchange.

The invention discloses a bimodal particle size distribution lithium disilicate glass ceramic, a restoration and a preparation method. The preparation method of the lithium disilicate glass ceramic comprises the steps of batching, melting, quenching, crushing, rotary heat treatment and the like, and the spherical lithium disilicate glass ceramic powder with bimodal particle size distribution in a specific particle size range is obtained by specifically setting raw materials and the steps of matched quenching and rotary heat treatment. The preparation method of the 3D printing restoration body with the one-step heat treatment method is specifically set, and on the basis that spherical lithium disilicate glass ceramic powder with bimodal particle size distribution in a specific particle size range is used as a raw material, the one-step heat treatment method is set, so that the 3D printing restoration body is obtained. And the lithium disilicate glass ceramic restoration with relatively high aesthetic properties is prepared.

The present application relates to the technical field of glass-ceramics, and in particular to a high-lithium-content glass-ceramic, a chemically strengthened glass-ceramic, and a use thereof. The high-lithium-content glass-ceramic comprises a lithium disilicate crystal phase as a primary crystal phase and has a specific content range of each oxide. On the basis of the molar percentage content of each oxide in the composition of the high-lithium-content glass-ceramic, the composition of the high-lithium-content glass-ceramic satisfies: 0.20≤2.25×Li2O-8×ZrO2-0.2×CaO ≤0.41. The high-lithium-content glass-ceramic of the present application can not only achieve high-temperature chemical strengthening, avoiding the problem of "surface cracking" and / or surface "delamination" occurring in a high-temperature salt bath, but also ensure that a chemically strengthened glass-ceramic having a high stress level and high mechanical strength performance can be prepared.

The invention provides a multiphase microcrystal glass fiber and a preparation method thereof, and the preparation method comprises the following steps: (1) placing mixed glass powder in a kiln, and sequentially melting, homogenizing and clarifying to obtain mixed glass liquid; wherein the mixed glass powder comprises SiO2 (silicon dioxide), Al2O3 (aluminum oxide), Li2O (lithium oxide), P2O5 (phosphorus pentoxide), ZrO2 (zirconium oxide), MgO (magnesium oxide), CaO (calcium oxide), TiO2 (titanium oxide), Na2O (sodium oxide), K2O (potassium oxide), BaO (barium oxide), ZnO ( (2) enabling the mixed glass liquid to flow out through a gradient heating furnace, and entering a heat preservation tank for devitrification to obtain microcrystalline glass liquid; wherein crystals in the glass ceramic liquid comprise at least one of lithium disilicate, lithium silicate, petalite or cordierite; and (3) enabling the microcrystalline glass liquid to flow out through a temperature control bushing plate, and drawing to obtain the multiphase microcrystalline glass fiber. According to the scheme, through cooperation of the components and the process, it is ensured that controllable devitrification of the glass is completed, meanwhile, good high-temperature fluidity is maintained, continuous preparation from molten glass to the multiphase microcrystalline glass fiber is successfully achieved, and the obtained glass fiber product has the high elastic modulus, the low dielectric constant and the low thermal expansion coefficient.

The invention belongs to the technical field of glass ceramics, and particularly relates to glass ceramics, chemically strengthened glass ceramics and application of the chemically strengthened glass ceramics, the glass ceramics comprise a main crystalline phase lithium disilicate crystalline phase and have specific ranges of the content of each oxide, and the composition of the glass ceramics meets the condition that SiO2 / Li2O is larger than or equal to 2.00 and smaller than or equal to 2.40 according to the content expressed by the mole percent of each oxide in the composition of the glass ceramics. The microcrystalline glass provided by the invention has high intrinsic strength and excellent optical performance, and the chemically strengthened microcrystalline glass with high stress level and excellent deformation resistance can be prepared through chemical strengthening.

The present invention relates to a glass ceramic including: at least one of a lithium disilicate type crystal and a solid solution crystal thereof; at least one of a virgilite type crystal and a solid solution crystal thereof; and a residual glass phase, in which a fracture toughness value KIC is 1.0 MPa·m0.5 or more, and a haze value in terms of a thickness of 0.7 mm is 0.8% or less.

The invention provides a lithium disilicate-fluorapatite composite bioglass ceramic as well as a preparation method and application thereof, and the lithium disilicate-fluorapatite composite bioglass ceramic comprises the following components in percentage by total mass of the bioglass ceramic: 26 to 67.7 percent of SiO2, 12.6 to 13.9 percent of Li2O, 3.0 to 5.0 percent of P2O5, 1.5 to 3.5 percent of CaO, 3.0 to 6.0 percent of NaF and 1.0 to 2.0 percent of 8YSZ. The method comprises the following steps: (1) taking lithium carbonate, aluminum oxide, calcium oxide, boric acid, potassium carbonate, lanthanum trioxide and SiO2 as raw materials, mixing the raw materials with a nucleating agent and CeO2, and grinding to obtain basic glass powder; (2) carrying out high-temperature melting on the basic glass powder for 40-60 minutes, and carrying out heat preservation; (3) continuously melting the molten glass at high temperature, and pouring and molding the molten glass to obtain a transparent glass body; and (4) heating the transparent glass body to 800-840 DEG C, and cooling to obtain the lithium disilicate-fluorapatite composite biological glass ceramic. The composite bioglass ceramic provided by the invention has good biocompatibility and excellent mechanical properties, and the preparation method can improve the reliability and service life of the prosthesis.

The invention provides a zirconium oxide and lithium disilicate glass ceramic composite material as well as a preparation method and application thereof. The composite material comprises machinable zirconium oxide and machinable lithium disilicate glass ceramic wrapping the machinable zirconium oxide, the machinable zirconium oxide is prepared from the following raw materials in parts by weight: 88 to 98 parts of ZrO2, 0.5 to 9 parts of a stabilizer, 0.1 to 3 parts of a sintering aid and 0 to 1.5 parts of a coloring agent. The composite material provided by the invention is easy to process, good in machinability, tight in bonding effect and high in strength and hardness, the artificial tooth bionic effect can be obtained after processing is completed, sintering and porcelain coating are not needed, and the clinical tooth making period is shortened.

The invention relates to a multi-layer glass ceramic shaping device, multi-layer lithium disilicate glass ceramic and a preparation method thereof. The multi-layer glass ceramic shaping device comprises a melting and cooling unit, a material guiding unit and a shaping unit which are sequentially connected from top to bottom, the melting cooling unit comprises m melting cooling assemblies which are arranged in parallel; the material guide unit comprises n material guide parts; a heat preservation component is further arranged on the outer side of each material guide component; the shaping unit comprises a first shaping assembly and a second shaping assembly arranged on the lower portion of the first shaping assembly, the first shaping assembly comprises p first shaping clamping plates, and m = n = p > = 2; a first discharge port of the melting and cooling assembly is connected with an inlet of the material guide part, and an outlet of the material guide part is connected with the first shaping clamping plate; continuous preparation of the multi-layer lithium disilicate glass ceramics is achieved, and the current requirement for gradient color or multi-layer color glass ceramics is met.

The present invention discloses a method for improving the mechanical and biological activity of lithium disilicate glass ceramics by composite ion exchange, which comprises: first, removing crystallization water from Ca(NO3)2·4H2O to obtain Ca(NO3)2; second, placing KNO3 in Ca(NO3)2 and heating and keeping the mixture warm until it is completely melted to obtain a KNO3-Ca(NO3)2 mixed bath salt; third, maintaining the KNO3-Ca(NO3)2 mixed bath salt at a constant temperature, and placing the mixture into lithium disilicate glass ceramics for ion exchange treatment; fourth, taking it out, cooling it to room temperature, and washing the residual molten salt on the surface. The present invention uses Li + / Ca 2+ 、Li + / K + Composite ion exchange regulates the stress state and ion distribution of the surface of lithium disilicate glass ceramics, and constructs a residual compressive stress layer and a gradient Ca-rich layer on its surface. 2+ , K + The bioactive alkali ion layer improves the mechanical properties and bioactivity of lithium disilicate glass ceramics and is suitable for medical implants.

The present invention relates to a crystallized glass in which the most abundant crystal is a lithium disilicate crystal, and the difference between the proportion (mass%) of the most abundant crystal and the proportion (mass%) of the second most abundant crystal is 20 mass% or more.

Disclosed herein are glass-ceramics that may include a phase assemblage including: 35 wt% to 60 wt% of a petalite crystalline phase; 20 wt% to 60 wt% of a lithium disilicate crystalline phase; and 5 wt% to 20 wt% of a residual amorphous glass phase. The glass-ceramics may further include copper metal nanoparticles dispersed in the residual amorphous glass phase. The glass-ceramics may appear red in color and comprises transmittance color coordinates in CIE LAB color space of: L* greater than or equal to 0 and less than or equal to 100; a* greater than or equal to -23 and less than or equal to 62; and b* greater than or equal to -10 and less than or equal to 60.5 at an article thickness of 0.55 mm for a CIE illuminant D65 under SCI UVC conditions and a 10 degree observer angle.

The application belongs to the technical field of glass-ceramics material, and particularly relates to a 3D hot-bendable glass-ceramics, a preparation method and application thereof. The application provides a 3D hot-bendable glass-ceramics, which comprises petalite crystal phase, lithium disilicate crystal phase and quartz crystal phase. The total crystal phase content of the 3D hot-bendable glass-ceramics is 40-70%, wherein the sum of the petalite crystal phase content and the lithium disilicate crystal phase content accounts for 50-70% of the total crystal phase content, and the quartz crystal phase content accounts for 4-10% of the total crystal phase content. The 3D hot-bendable glass-ceramics has the petalite crystal phase, the lithium disilicate crystal phase and the quartz crystal phase before hot bending, and the proportion of each crystal phase is controlled in a suitable range, so that a pleasing white appearance is presented, and the 3D hot-bendable glass-ceramics can be 3D hot-bent at 810 DEG C to be formed into a 3D glass-ceramics and a three-dimensional product.

This application provides a microcrystalline glass, a chemically strengthened microcrystalline glass, a cover glass, and an electronic device, belonging to the field of microcrystalline glass technology. This application achieves this by ensuring the microcrystalline glass meets specific composition and crystal phase structure requirements, ensuring the content and ratio of each component within a specific range, and ensuring specific molar percentage relationships between Na₂O, B₂O₃, ZrO₂, or Li₂O. Simultaneously, it ensures that the microcrystalline glass uses lithium disilicate as the main crystal phase. This not only endows the microcrystalline glass with excellent optical properties and high intrinsic strength but also enables the rapid and efficient production of chemically strengthened microcrystalline glass with high stress levels and high mechanical strength under conventional chemical strengthening processes.

A glass-ceramic article comprises a phase assemblage comprising: greater than or equal to 10 wt % and less than or equal to 30 wt % residual amorphous glass phase; greater than or equal to 20 wt % and less than or equal to 42 wt % lithium disilicate crystalline phase; less than or equal to 42 wt % spodumene crystalline phase; and less than or equal to 40 wt % petalite crystalline phase. The glass-ceramic article has: an opacity greater than or equal to 10% and less than or equal to 65%, measured on a 0.55 mm thick glass-ceramic article; and a haze greater than or equal to 0.2% and less than or equal to 98%, measured on a 0.5 mm thick glass-ceramic article.