43 results about "Lithium disilicate" patented technology

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.

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.

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.

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 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 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 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.

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.

The present application belongs to the technical field of microcrystalline glass. Provided are a chemically strengthened microcrystalline glass, a cover glass plate, an electronic device and a glass component. A high-lithium-content microcrystalline glass having a specific composition and using lithium disilicate as a principal crystalline phase undergoes chemical strengthening treatment so as to satisfy specific stress characteristics, especially the molar percentage content of ZrO2 in the microcrystalline glass and the stress characteristic relational expression A satisfy specific requirements, i.e. satisfying the requirement of range of a relational expression B. Therefore, the present application solves the problem of "surface cracking" of the manufactured chemically strengthened microcrystalline glass and can also ensure that the chemically strengthened microcrystalline glass has high mechanical strength, thereby ensuring that the chemically strengthened microcrystalline glass has excellent damage resistance.

The application relates to the field of microcrystalline glass, and particularly discloses a lithium disilicate whisker reinforced glass ceramic and a preparation method thereof. The lithium disilicate whisker reinforced glass ceramic comprises glass powder and lithium disilicate whiskers accounting for 3-5% of the mass of the glass powder. The glass powder comprises the following components in percentage by weight: 62-68.5% of SiO2, 25-30% of Li2O, 1-1.5% of P2O5, 1.5-2% of K2O, 1.5-2.5% of Al2O3 and 1.5-2.5% of La2O3. The glass ceramic toughened by the lithium disilicate whiskers has high bending strength and fracture toughness, and has good antibacterial property, thereby providing a new way for preparing an oral cavity repairing material with high toughness and antibacterial property.

The application discloses a kind of self-toughening transparent microcrystalline glass and its preparation method, product and application.The crystal phase of the microcrystalline glass includes lithium disilicate and lithium phosphate, and the crystallinity is 50%~85%;Crystal grain is long column, radial size≤0.3 μm, length≤3 μm, length-diameter ratio 1~30;The transmittance of 550 nm wavelength light is≥88% under 1 mm thickness.The preparation method includes: the base glass is carried out two-stage heat treatment, and microcrystalline glass is obtained;Further chemical strengthening can be carried out by ion exchange, and the surface compressive stress of the chemical strengthening product is≥410MPa.The product made of the microcrystalline glass includes mobile phone display cover plate, vehicle-mounted display screen cover plate, robot shell and aircraft porthole.The application realizes self-toughening by forming high length-diameter ratio crystal grain microstructure, has excellent mechanical properties and optical transparency, and can be applied to optical equipment, electronic equipment, automobile, aerospace and robot fields.

The present application relates to the technical field of glass, and discloses a microcrystalline glass, a preparation method thereof, a microcrystalline laminated glass, a preparation method and application thereof, the microcrystalline glass contains a crystalline phase, the crystalline phase includes a first main crystal phase and a second main crystal phase, the first main crystal phase is lithium disilicate with an expression formula of Li2Si2O5, and the second main crystal phase is tungsten bronze with an expression formula of M x WO3. The preparation method of the microcrystalline glass provided by the present application has the characteristics that the prepared microcrystalline glass has uniform grain size.

The invention discloses opaque lithium disilicate glass ceramic and a preparation method thereof, the opaque lithium disilicate glass ceramic is composed of SiO2, K2O, Li2O, Al2O3, P2O5, CeO2, MgO, ZnO and B2O3 as raw materials, the ratio of silicon to lithium is 2.5-2.8, and the mass ratio of SiO2 / (K2O + Li2O) is 3.75-5. The transmittance of the obtained lithium disilicate glass ceramic can be adjusted within 22%-34%, the average value of three-point bending strength is 350-420 MPa, the fracture toughness is 2.5-3.2 MPa.m < 1 / 2 >, the thermal expansion coefficient is (10.6 + / -0.5) * 10 <-6 > / K, the total chromatic aberration delta E value is detected to be smaller than or equal to 1.2 under different background colors through a spectrophotometer, and the lithium disilicate glass ceramic has very high opaque performance, can be matched with the color of adjacent teeth, and is suitable for being used as a dental implant. The method is of great significance in prolonging the service life and improving the aesthetic effect of the prosthesis.

The application belongs to the technical field of preparing microcrystalline glass materials, and particularly relates to a high-toughness lithium disilicate microcrystalline glass composite material, a preparation method thereof and application thereof. The method comprises the following steps: (1) preparing lithium disilicate glass micro powder; (2) immersing alumina fibers in a silica sol, and then taking out the alumina fibers and sintering the alumina fibers at 900-1100 DEG C, so that a silica film is formed on the surface of the alumina fibers; (3) mixing the product obtained in the step (2) with the lithium disilicate glass micro powder to obtain a mixture; (4) sintering the mixture to form an intermediate block, and then sintering the intermediate block at 790-860 DEG C and under a pressure of 15-45 MPa. The fracture toughness of the lithium disilicate microcrystalline glass composite material prepared by the method can reach 4.3 MPa·m 1 / 2 The above value is far higher than the current commercial lithium disilicate microcrystalline glass material of 3.0 MPa·m 1 / 2 , and can significantly improve the performance of the lithium disilicate microcrystalline glass.

Provided is a glass containing a crystalline phase, the glass including at least one crystalline phase selected from the group consisting of cristobalite, lithium disilicate, and petalite, in which a value of E / ρ, which is a ratio of Young's modulus E to specific gravity ρ, is 35 or more, and a glass transition point is 680° C. or higher.

Disclosed in the present invention is a multi-crystal nucleus transparent glass-ceramic and a preparation method therefor, said preparation method comprising the following steps: during glass production, adding a plurality of types of nucleation agents, and after processing, acquiring a mother glass having certain outer dimensions; and placing the mother glass obtained in S2 under a temperature of T1 and heating for 1h-6h to perform annealing treatment, after the annealing treatment is complete, placing under a temperature of T2 and heating 1h-6h to perform nucleation treatment, and after nucleation treatment is complete, placing under a temperature of T3 and heating 0-3h to perform crystallization treatment. T1<T2. The present invention produces a glass-ceramic containing multiple types of crystal nuclei and having crystal phases of lithium disilicate and petalite. The multiple crystal nuclei reduces the nucleation and crystallization energies required for devitrification, thus being able to reduce thermal treatment temperature and time, and adjust the ratio of crystals. The glass-ceramic prepared by means of the present preparation method features an increased damage resistance, good fracture toughness, and a broad application range.

Provided is a dental bulk block made from a glass-ceramic material having a crystalline phase embedded in an amorphous glass matrix. The crystalline phase includes eucryptite and at least one lithium silicate-based crystalline phase selected from the group consisting of lithium metasilicate and lithium disilicate. The dental bulk block is a functionally graded material having a crystalline size gradient with respect to a depth thereof and having no interface at a point of change in main crystalline size gradient value. The bulk block that is heat-treated at 820° C. for 40 minutes exhibits a characteristic peak of a spodumene crystalline phase in an X-ray diffraction analysis result graph unlike the bulk block that is heat-treated at 820° C. for 2 minutes.

The present disclosure discloses a lithium disilicate glass-ceramic with high strength and high transparency and a preparation method and use thereof. A raw material composition of the lithium disilicate glass-ceramic comprises: 63-75 wt % of SiO2, 13-18 wt % of Li2O, 1-6 wt % of Al2O3, 1-10 wt % of K2O, 2-6 wt % of P2O5, 0-4 wt % of an additive and 0-10 wt % of a colorant; a main crystal phase of the lithium disilicate glass-ceramic is lithium disilicate crystals, and an impurity phase of the lithium disilicate glass-ceramic is any one or a combination of at least two selected from the group consisting of lithium metasilicate, lithium phosphate and quartz; the lithium disilicate crystal has a size larger than 700 nm and a length-diameter ratio not less than 3.

The present application discloses microcrystalline glass. The microcrystalline glass comprises a lithium disilicate crystal phase as a main crystal phase. On the basis of the molar percentages of oxides, the microcrystalline glass comprises the following components: SiO2: 55.00-65.00 mol%, P2O5: 1.00-3.00 mol%, ZrO2: 2.00-5.00 mol%, Li2O: 25.00-32.00 mol%, Al2O3: 0-2.00 mol%, MgO: 0-2.00 mol%, Na2O: 0-3.00 mol%, K2O: 0-1.00 mol%, CaO: 0-2.00 mol%, SrO: 0-2.00 mol%, Ta2O5: 0-1.00 mol%, and La2O3: 0-1.00 mol%. In addition, these components in the microcrystalline glass also satisfy a specific content relationship. In the present application, the components of the microcrystalline glass are optimized and adjusted, such that the microcrystalline glass has a specific composition and structure, and it is ensured that the microcrystalline glass contains a large amount of lithium disilicate crystal phase, thereby ensuring that the microcrystalline glass has a high intrinsic strength and an excellent optical performance, significantly improving the chemical etching thinning effect of the microcrystalline glass, achieving a more excellent chemical etching thinning effect of the microcrystalline glass in a low concentration acidic liquid, and facilitating the improvement of the chemical etching thinning rate of the microcrystalline glass.