116 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.

The invention provides chemically strengthened glass ceramics, cover plate glass, electronic equipment and a glass device, and belongs to the technical field of glass ceramics. High-lithium-content microcrystalline glass which has specific composition and takes lithium disilicate as a main crystalline phase meets specific stress characteristics after chemical strengthening treatment, and particularly, a relational expression A of the molar percentage content of ZrO2 in the microcrystalline glass and the stress characteristics meets specific requirements, namely, the range requirement of a relational expression B is met; according to the invention, the problem of'surface cracking 'of the prepared chemically-strengthened glass ceramic can be effectively overcome, and the chemically-strengthened glass ceramic can be ensured to have high mechanical strength performance, so that the chemically-strengthened glass ceramic can be ensured to have excellent damage resistance.

The present invention provides a strengthened glass ceramic and a preparation method and application thereof, the strengthened glass ceramic contains a petalite crystal phase and a lithium disilicate crystal phase, the strengthened glass ceramic has a compressive stress layer formed by chemical strengthening on the surface and a tensile stress layer inside, and the strengthened glass ceramic satisfies: (CS50 / DOL0) > = 0.332 * (surface CS / CTCV); dOL0 is greater than or equal to 0.187 t; 1.01% > = delta alpha > = 0.65%, and delta alpha = 5 * 10 <-5 > * CTAV + 0.0026. Under the condition of 80-mesh abrasive paper, the average height of the reinforced microcrystalline glass in falling failure can reach 1.30-1.80 m. Compared with the prior art, the reinforced microcrystalline glass disclosed by the invention has the advantages that the breaking resistance on rough ground is obviously improved, and the reinforced microcrystalline glass can be used as a protective cover plate material of intelligent terminal products such as mobile phones.

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 present invention provides a strengthened glass ceramic and a preparation method and application thereof, the strengthened glass ceramic contains a petalite crystal phase and a lithium disilicate crystal phase, the strengthened glass ceramic has a compressive stress layer formed by chemical strengthening on the surface and a tensile stress layer inside, and the strengthened glass ceramic satisfies: (CS50 / DOL0) > = 0.332 * (surface CS / CTCV); dOL0 is greater than or equal to 0.187 t; 1.01% > = delta alpha > = 0.65%, and delta alpha = 5 * 10 <-5 > * CTAV + 0.0026. Under the condition of 80-mesh abrasive paper, the average height of the reinforced microcrystalline glass in falling failure can reach 1.30-1.80 m. Compared with the prior art, the reinforced microcrystalline glass disclosed by the invention has the advantages that the breaking resistance on rough ground is obviously improved, and the reinforced microcrystalline glass can be used as a protective cover plate material of intelligent terminal products such as mobile phones.

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 (L2Si2O5) crystalline phase. The glass-ceramic may have high fracture toughness, transparency, hardness, and may be strengthen via ion-exchange.

The present invention belongs to the technical field of lithium-aluminum-silicon microcrystalline glass, and specifically relates to 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. The reinforced microcrystalline glass of the present invention has good non-contact surface cracking resistance, and also has good contact surface cracking resistance and weather resistance.

A three-dimensionally shaped crystallized glass, including: a petalite crystal; and a lithium disilicate crystal, where the three-dimensionally shaped crystallized glass has an average transmittance of a light at a wavelength in a range of 380 nm to 780 nm of at least 80% in terms of a thickness of 0.8 mm, and the three-dimensionally shaped crystallized glass comprises, in mass % on an oxide basis: from 60 to 75% of SiO2; from 5 to 15% of Al2O3; from 4 to 20% of Li2O; from 0 to 4% of Na2O; from 0 to 3% of K2O; from 3 to 15% in total of at least one of SnO2 and ZrO2; and from 0.5 to 5% of P2O5.

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 invention discloses bacteriostatic and antibacterial lithium disilicate glass ceramic and a preparation method thereof. The bacteriostatic and antibacterial lithium disilicate glass ceramic comprises the following components in percentage by weight: 60-70% of lithium disilicate whiskers, 5-12% of a nucleating agent, 1-5% of aluminum oxide, 1-4% of calcium oxide, 5-10% of an antibacterial agent and 12-18% of fluorapatite, wherein the nucleating agent is formed by compounding phosphorus pentoxide and zirconium oxide, and the antibacterial agent is formed by compounding silver oxide and zinc oxide; the invention relates to the technical field of lithium disilicate glass ceramics. In the glass ceramic, silver ions can be combined with groups such as sulfydryl and amino in bacterial cells to interfere the metabolic process of bacteria and inactivate enzymes of the bacteria so as to inhibit growth and reproduction of the bacteria, and zinc ions can influence permeability of bacterial cell membranes and destroy physiological functions of the bacteria and cooperate with the silver ions to enhance the antibacterial effect of the glass ceramic.

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.

The invention belongs to the technical field of glass ceramic materials, and particularly relates to glass ceramic capable of being subjected to 3D hot bending and a preparation method and application thereof.The glass ceramic capable of being subjected to 3D hot bending comprises a petalite crystal phase, a lithium disilicate crystal phase and a quartz crystal phase, the total crystal phase content of the glass ceramic capable of being subjected to 3D hot bending is 40-70%, the sum of the contents 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. The microcrystalline glass capable of being subjected to 3D hot bending is controlled to have a petalite crystal phase, a lithium disilicate crystal phase and a quartz crystal phase before hot bending, and the proportion of each crystal phase is controlled to be in a suitable range, so that the microcrystalline glass shows a pleasant white appearance, 3D hot bending forming can be performed at 810 DEG C, the 3D microcrystalline glass can be prepared, and a three-dimensional product can be processed.

This application belongs to the field of glass-ceramics technology, specifically relating to a glass-ceramic, a chemically strengthened glass-ceramic, and their applications. The glass-ceramic comprises a primary lithium disilicate crystalline phase and contains various oxides within specific ranges, with the composition, expressed as a molar percentage of each oxide in the glass-ceramic composition, satisfying the following: 2.00 ≤ SiO₂ / Li₂O ≤ 2.40. The glass-ceramic of this application exhibits high intrinsic strength and excellent optical properties, and can be chemically strengthened to produce a chemically strengthened glass-ceramic with high stress levels and excellent deformation resistance.

The present application discloses a glass-ceramic, which contains a lithium disilicate crystal phase as a main crystal phase. Expressed in molar percentage based on oxides, the glass-ceramic contains 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%, La2O3: 0-1.00 mol%, and each component in the glass-ceramic also satisfies a specific content relationship. The present application optimizes and adjusts the components of microcrystalline glass to make the microcrystalline glass meet specific composition and structure, ensuring that the microcrystalline glass contains a large amount of lithium disilicate crystal phase. This not only ensures that the microcrystalline glass has high intrinsic strength and excellent optical properties, but also significantly improves the chemical etching and thinning effect of the microcrystalline glass, so that the microcrystalline glass can achieve a relatively excellent chemical etching and thinning effect in a relatively low concentration of acidic liquid, which is beneficial to improving the chemical etching and thinning rate of the microcrystalline glass.

The present application relates to the technical field of glass ceramics, and in particular, to a glass ceramic, a chemically strengthened glass ceramic, and uses thereof. The glass ceramic comprises lithium disilicate as a main crystal phase and has specific content ranges of oxides. On the basis of the content expressed as the molar percentage of each oxide in the composition of the glass ceramic, the composition of the glass ceramic satisfies 2.00≤SiO2 / Li2O≤2.40. The glass ceramic of the present application has high intrinsic strength and excellent optical performance, and can be chemically strengthened to obtain a chemically strengthened glass ceramic with high stress level and excellent deformation 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 provides lithium disilicate glass ceramic containing zinc spinel as a sub-crystalline phase and a preparation method and a product of the lithium disilicate glass ceramic, and belongs to the technical field of lithium disilicate glass ceramic. The lithium disilicate glass ceramic is prepared by simultaneously introducing ZnO and Al2O3 components necessary for forming a zinc spinel secondary crystal phase into a basic glass component in a glass melting stage, melting in an air atmosphere and adopting a casting method or a sintering method, and zinc spinel is separated out from a main crystal phase lithium silicate glass ceramic in the obtained product to serve as the secondary crystal phase. The zinc spinel sub-crystalline phase separated out from the lithium disilicate glass ceramic can improve the strength, the fracture toughness and the acid and alkali corrosion resistance of the lithium disilicate glass ceramic, so that the restoration is not easy to generate the phenomena of ceramic cracking and the like in the processing, polishing and using processes, the product stability is improved, and the use space of the product is widened.

The present application relates to the field of glass manufacturing, and specifically discloses a low dielectric loss microcrystalline glass, its preparation method and application. In the preparation method of this microcrystalline glass, by optimizing the raw material composition ratio, and adopting a heat treatment crystallization process of first heating, then cooling, and then heating again, the structure and chemical composition of the microcrystalline glass are optimized, thereby reducing its dielectric loss and improving its insulation performance. The crystals of the obtained microcrystalline glass are mainly lithium disilicate crystals. At 1MHz and 24℃, the ratio of the dielectric loss tangent tanδ*1000 to the relative dielectric constant ε is below 1.0, which can meet the applicability in the 5G environment and can be used for mobile phone covers, tablet computer covers, watch covers, and car display covers, etc., with broad application prospects.

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.

A crystallized glass contains alpha-white silica as a main crystal phase, and lithium disilicate; in terms of mass% in terms of oxide, the content of the SiO2 component is 65.0% to 85.0%; the content of the Al2O3 component is 1.5% to 5.9%; the content of the P2O5 component is greater than 0% and less than 5.0%; the content of the Li2O component is 5.0% to 10.8%; the content of the ZrO2 component is 4.0% to 12.5%; and [(the content of the SiO2 component + the content of the Li2O component) / the content of the Al2O3 component] is greater than 13.9.

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.

The present invention is directed to a process for producing a sintered lithium disilicate glass ceramic dental restoration out of a porous 3-dim article, the process comprising the step of sintering the porous 3-dim article having the shape of a dental restoration with an outer and inner surface to obtain a sintered lithium disilicate ceramic dental restoration, the sintered lithium disilicate glass ceramic dental restoration comprisingSi oxide calculated as SiO2 from 55 to 80 wt.-%,Li oxide calculated as Li2O from 7 to 16 wt.-%,Al oxide calculated as Al2O3 from 1 to 5 wt.-%, andP oxide calculated as P2O5 from 1 to 5 wt.-%,wt.-% with respect to the weight of the dental restoration, the sintering being done under reduced atmospheric pressure conditions, the reduced atmospheric pressure conditions being applied at a temperature above 600° C.The present invention is also directed to a kit of parts comprising a porous 3-dim article having the shape of a dental milling block and a respective instruction of use.

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.

The present invention belongs to the technical field of lithium aluminum silicon glass-ceramics, and specifically relates to a strengthened glass-ceramic, a glass device, and an electronic device with excellent single-unit strength and excellent drop resistance. The strengthened glass-ceramic comprises a compressive stress layer and a tensile stress layer, and the main crystalline phase of the strengthened glass-ceramic comprises a petalite crystal phase and a lithium disilicate crystal phase. The strengthened glass-ceramic satisfies the following conditions: surface CS is 500-1000 MPa; 50.00> surface CS / |CT_AV|≥17.00 and |C T_AV|≥30MPa, where |CT_AV| is the absolute value of the average tensile stress in the tensile stress layer, in MPa; |CT_CV|≥50MPa, where |CT_CV| is the absolute value of the maximum tensile stress in the tensile stress layer, in MPa; 0.25t≥DOL_0≥0.15t, where DOL_0 refers to the depth of the compressive stress layer, and t is the thickness of the strengthened glass-ceramics; and the surface K2O concentration of the strengthened glass-ceramics is 7.00-15.00wt%. The strengthened glass-ceramics of the present invention have excellent resistance to non-contact surface cracking, excellent resistance to contact surface cracking, and excellent weather resistance.

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 present invention provides crystallized glass that achieves excellent strength by chemical toughening, and that is excellent in both strength when dropped and transparency. The present invention relates to crystallized glass that comprises a lithium disilicate type crystal and / or a solid solution crystal thereof, a virgilite type crystal and / or a solid solution crystal thereof, and a residual glass phase, and that has a fracture toughness value KIC of not less than 1.0 MPa·m0.5 and a haze value of not more than 0.8% based on a thickness of 0.7 mm.

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.