13 results about "Lithium metasilicate" patented technology

Disclosed is a pre-sintered ceramic block for a dental restoration, which has a low pre-sintering temperature, contains a silica main crystal phase, but does not contain or contains a small amount of lithium metasilicate crystal phase. The pre-sintered ceramic block has a low hardness, with a Vickers hardness of 0.5-3 GPa, which is significantly lower than that of a ceramic block containing a lithium metasilicate crystal phase, and same is suitable for dry machining and also wet machining when being machined into a dental restoration.

The invention discloses a grain size controllable negative electrode and a preparation method thereof, and belongs to the technical field of secondary battery materials. The preparation method comprises the following steps: weighing raw materials according to a molar ratio of a lithium source to SiOx of 0.1-0.7, adding 5-10wt% of a carbon source (naphthalene), and uniformly mixing; and heating the mixed material to 600-800 DEG C at the speed of 1-10 DEG C / min in an inert gas atmosphere, and keeping the temperature for 2-10 hours to obtain the negative electrode material. Through in-situ carbon coating, the growth of silicon and lithium metasilicate grains is inhibited by using the high-temperature heat absorption characteristic of naphthalene, and meanwhile, the conductivity can be improved by an amorphous carbon layer formed by naphthalene carbonization; in the prepared negative electrode material, the grain size of silicon is 8-13nm, the grain size of lithium metasilicate is 9-20nm, the proportion of lithium metasilicate in the total lithium silicate is greater than or equal to 94%, and the capacity retention rate can reach 77.1-90.4% after 100 cycles at 0.5 C multiplying power. The preparation method is simple in process and suitable for industrialization, and the cycle performance and the first coulombic efficiency of the silicon-oxygen negative electrode can be remarkably improved.

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.

Provided are a fluorescent glass ceramic with high transparency and a preparation method and use thereof. The fluorescent glass ceramic includes the following raw materials by mass percentage: 63 wt % to 70 wt % of SiO2, 13 wt % to 16 wt % of Li2O, 1 wt % to 6 wt % of Al2O3, 1 wt % to 10 wt % of K2O, 2 wt % to 6 wt % of P2O5, 0.5 wt % to 3.5 wt % of CeO2, 0 wt % to 4 wt % of an additive, 1 wt % to 4 wt % of a lanthanide oxide with an atomic number of 59 to 71, and 0 wt % to 8 wt % of a colorant. The fluorescent glass ceramic has a lithium metasilicate crystal as a principal crystalline phase, and the lithium metasilicate crystal has a layered or plate-like structure and a grain size of 0.1 μm to 1.5 μm.

A lithium silicate glass ceramic having lithium metasilicate as main crystal phase and having not more than 30 wt.-% of lithium metasilicate crystals and having the following components in the amounts indicated:ComponentWt.-%SiO271.0 to 82.0Li2O6.0 to 14.0MeI2O4.0 to 15.0Al2O32.0 to 10.0P2O50.5 to 7.0,wherein MeI2O is selected from Na2O, K2O, Rb2O, Cs2O and mixtures thereof, andwherein the molar ratio of SiO2 to Li2O is in the range of 2.5 to 5.0.

A pre-sintered porcelain block for dental restoration; the pre-sintered porcelain block does not contain crystal phases and has a Vickers hardness of 0.5-2 GPa. Due to a hardness which is significantly lower than that of the porcelain block containing a lithium metasilicate crystal phase, the pre-sintered porcelain block may be processed by using dry machining and can simultaneously be processed by using wet machining when being mechanically processed into a dental restoration shape.

A lithium silicate glass ceramic having lithium metasilicate as main crystal phase and having not more than 30 wt.-% of lithium metasilicate crystals.

Preparation of a silicon composite material, and a negative electrode plate containing same, relating to the field of silicon-based composite materials. The silicon composite material comprises silicon nanoparticles, carbon nanotubes, silicon oxide, lithium oxide, and lithium metasilicate. The carbon nanotubes and the silicon nanoparticles are dispersed and cross-linked to form a three-dimensional network structure. Silicon oxide, lithium oxide, and lithium metasilicate cover the three-dimensional network structure to form secondary particles. The secondary particles and graphite are homogenized and coated according to a specific particle size ratio to prepare the negative electrode plate containing the silicon composite material and having high-capacity development, good conductivity, high coulombic efficiency, small volume expansion, and high cycling stability.

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 invention belongs to the technical field of dental restoration material manufacturing, and particularly relates to beta-spodumene and lithium metasilicate co-doped and modified dental lithium disilicate glass ceramic as well as a preparation method and application thereof. Beta-spodumene powder, lithium metasilicate seed crystal and lithium disilicate mother glass powder are used as raw materials, slurry is cured layer by layer by adopting a photocuring additive manufacturing technology, and then co-doping modification of the beta-spodumene powder and lithium metasilicate is synchronously realized through degreasing, nucleation, crystallization and liquid-phase sintering, so that the lithium metasilicate co-doped modified beta-spodumene powder is obtained. The prepared beta-spodumene and lithium metasilicate co-doped and modified dental lithium disilicate glass ceramic has the characteristics of high compactness, high flexural strength, high fracture toughness, good clinical suitability and the like. The problems that traditional lithium disilicate glass ceramic is low in fracture toughness, and additive manufacturing ceramic is insufficient in compactness and strength are effectively solved, and the method is suitable for manufacturing high-precision personalized dental prostheses such as dental crowns and bridges.

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.

This invention discloses a high-hardness transparent microcrystalline glass, its preparation method, and its applications. The crystalline phases of the microcrystalline glass include lithium disilicate, lithium phosphate, and at least one of lithium feldspar, β-quartz or their solid solutions, lithium metasilicate, β-spodumene or their solid solutions. It has a grain aspect ratio of 1-30, a transmittance of ≥82% for light with wavelengths of 400-800 nm at a thickness of 1 mm, a Vickers hardness ≥7.7 GPa, and a crystallinity of 50%-85%. The preparation method includes: preparation of a base glass, annealing of the base glass, and heat treatment crystallization. This invention offers strong process controllability, a wide heat treatment process window, and good reproducibility. The prepared microcrystalline glass possesses high transparency, high hardness, high strength, high toughness, and excellent chemical strengthening response characteristics. It can be used as a protective material for mobile phone cover plates, automotive central control screens, robot interactive interfaces, etc., and is suitable for high-end equipment fields such as aircraft portholes.

The invention provides a dental lithium silicate glass composition, a dental lithium silicate glass ceramic and a dental crown restoration. The dental lithium silicate glass composition can provide a dental lithium silicate glass ceramic capable of efficiently precipitating main crystals (lithium disilicate and / or lithium metasilicate) even after heat treatment. The dental lithium silicate glass composition is composed of the following components (excluding Al2O3): 60.0-80.0 wt% of SiO2; li2O: 10.0 wt% to 17.0 wt%; k2O: 0.5 to 10.0 wt%; zrO2: 0.5 to 5.0 wt%; 1.0 to 6.0 wt% of a nucleating agent; 0.0 wt% of a glass stabilizer; and 0 to 10.0 wt% of a coloring agent.