86 results about "Leucite" patented technology

A ceramic restoration based on a leucitic glass-ceramic, which is characterized in that the glass-ceramic includes by way of componentsin that it contains, as sole crystalline phase, leucite in a total proportion from 20 to 45 wt.-%, at least 80% of the theoretically producible quantity of leucite being present, and in that it exhibits a linear coefficient of thermal expansion alpha(20-500° C.) from 12.5.10-6 to 15.5.10-6 K-1. This glass-ceramic is particularly suitable for processing as pressed ceramic and can be advantageously faced with dental ceramic that exhibits a linear coefficient of thermal expansion alpha(20-500° C.) from 13.5.10-6 to 17.0.10-6 K-1.

A solid oxide fuel cell device incorporates a sealing material resistant to hydrogen gas permeation at a sealing temperature in the intermediate temperature range of 600° C.-800° C., the seal having a CTE in the 100×10⁻⁷/° C. to 120×10⁻⁷/° C., wherein the sealing material comprises in weight %, of: (i) a 80 to 95 wt % of glass frit, the glass frit itself having a composition in mole percent of: SiO₂ 70-85%; Al₂O₃ 0-5%; Na₂O₃ 0-8%; K₂O 10-25%; ZnO 0-10%; ZrO₂ 0-6%; MgO 0-7%; TiO₂ 0-2%; and (ii) and 5 wt % to 25 wt % of addition comprising at least one of: alumina, zirconia or leucite.

The invention discloses a wear resistant and high-hardness diamond glaze, a preparation method and application. The wear resistant and high-hardness diamond glaze is prepared from the following raw materials according to mass percent: 5 to 15% of kaolin, 5 to 10% of andalusite, 5 to 10% of orthoclase, 5 to 12% of leucite, 1 to 3% of essonite, 10 to 18% of nepheline, 5 to 15% of spodumene, 2 to 8% of wollastonite, 3 to 7% of quartz, 5 to 10% of zircon sand, 5 to 10% of white corundum, 1 to 3% of dolomite, 1 to 3% of calcined white talc, 0.1 to 0.5% of zinc oxide and 0.5 to 3% of additive. According to the wear resistant and high-hardness diamond glaze, the preparation method and the application, the selection of mineral raw materials of the glaze is optimized, firstly, the wear resistant and high-hardness mineral raw materials such as the andalusite (the hardness is 6.9 to 7.4), the white corundum (the hardness is 9.0), the leucite (the hardness is 5.5 to 6) and the essonite (the hardness is 7 to 7.5) are selected, the grain fineness and addition of the wear resistant and high-hardness mineral raw materials are controlled through reasonable grain composition, and by adopting the subsequent preparation process and application process, the wear resistance and hardness of the diamond glaze are greatly increased.

The invention relates to an oral cavity bio-active nucleated glass with adjustable colour and its rpeparation method. Its preparation method includes the following steps: firstly, uniformly mixing raw materials according to a certain mixing ratio, melting for 3 hr. at 1400-1550 deg.C, pouring the molten glass inti mould and forming to obtain blank, cooling to room temp., heating glass blank and heat-insulating to make glass nucleate, continuously heating and heat-insulating to make glass crystallize to obtain the bio-active nucteated glass using apatite and fluorophlogopite as main crystal phase. Said nucleated glass uses TiO2/ZrO2 as crystal nucleus agent, and contains a certain crystal phase formed from leucite and calc-silicate stone to raise its strength, and said product possesses good bio-compatibility, machinability and beautifulness.

A porcelain blank comprising a porcelain composition for dental restorations comprising a leucite crystallite phase and a glass matrix phase, wherein the leucite crystallites possess diameters not exceeding about 10 micron. Preferably, the porcelain composition has a maturing temperature from about 750° C. to about 1050° C. and a coefficient of thermal expansion from about 9×10⁻⁶/° C. to about 17.5×10⁻⁶/° C., and comprises:

The ceramic product provided by the present invention is provided with at least two ceramic members bonded to each other, and the bond parts between these ceramic members bonded to each other are formed from glass having leucite crystals precipitated within the glass matrix.

The invention relates to a glass used as a dental veneering porcelain. The glass comprises, by mass, 50%-70% of SiO2, 6%-17% of B2O3, 6%-25% of Al2O3, 1%-10% of Na2O, and 17%-30% of K2O. The glass undergoes heat treatment at 700DEG C-1100DEG C, and leucite microcrystalline glass with different thermal expansion coefficients can be obtained. The microcrystalline glass only contains tetragonal phase leucite crystals, the size of which is less than 4 micrometers. The leucite microcrystalline glass has very good thermal stability, after experiencing a porcelain fusing program 10 times, the thermal expansion coefficient change of the leucite microcrystalline glass is less than 2%, and in a 120min process of heat preservation at a porcelain fusing temperature of 850DEG C, the size and number of the leucite crystals do not have obvious change. The leucite microcrystalline glass can be used as a transparent porcelain and incisal porcelain in the veneering porcelain, and also can be used as a body porcelain if a pigment is added.

The invention relates to a tooth zirconia/leucite composite porcelain powder and a preparation method thereof. The material includes the following components: 50 to 60 percent of Sio2, 10 to 20 percent of Al2O3, 16 to 30 percent of K2O, 2 to 5 percent of Na2O and 2 to 15 percent of ZrO2. The preparation method of the material relates to: selecting a mineral potassium feldspar powder of the first grade, adding a certain amount of potash, nanometer tetragonal zirconia powder body and ethanol to uniformly mix in a globe mill and acquiring a raw material powder after drying; placing the raw material powder into a corundum crucible to calcine under a temperature of 1000 to 3000 DEG C for 30 to 90 minutes, cooling naturally and acquiring the zirconia/leucite composite porcelain powder with a grain diameter of 10 to 30Mum after crushing the raw material through ball milling. The crystalling phases of the zirconia and the leucite in the porcelain powder are distributed uniformly. The heat expansion coefficient of the powder is (12 to 16) multiplied by 10<-6>K and the anti-bending intensity of the powder is 90 to 130MPa. The invention is also characterized by good color masking property and high fracture toughness property, etc., and lays a foundation for the clinic application of mouth porcelain repairing.

The invention discloses a high-elasticity vibration-resistant expanded polyethylene plate and a method for manufacturing the same. The high-elasticity vibration-resistant expanded polyethylene plate comprises, by weight, 120-140 parts of polyethylene, 20-30 parts of ethylene-vinyl acetate copolymers, 10-14 parts of p-toluenesulfonhydrazide, 5-8 parts of dichlorotetrafluoroethane, 3-5 parts of dicumyl peroxide, 7-9 parts of zinc oxide, 40-50 parts of titanate-modified calcium carbonate, 8-10 parts of leucite powder, 5-7 parts of dynasylan ibteo, 6-9 parts of magnesium stearate, 4-6 parts of butyl stearate, 4-5 parts of hexamethylenetetramine, 3-5 parts of polycarbonate, 10-14 parts of aluminum hydroxide, 7-9 parts of titanium nitride whiskers, 6-8 parts of dioctyl adipate, 3-5 parts of 2-aminoethanol, 8-9 parts of dicyclohexyl phthalate, 7-9 parts of magnesium diboride and 4-6 parts of jade powder. The high-elasticity vibration-resistant expanded polyethylene plate and the method have the advantages that the polyethylene plate manufactured by the aid of the method not only is excellent in vibration-resistant and buffer performance, but also is high in mechanical strength and good in ageing resistant, and good flame-retardant effects can be realized.

The invention relates to a machinable bio-active nucleated glass and its preparation method. Said preparation method includes the following steps: firstly, uniformly mixing raw materials according toa certain proportion, melting them at 1400-1550 deg.C for 2-4 hr., pouring the molten glass liquor into mould and forming to make blank, cooling to room temp., heating and heat-insulating to make glass nucleate, continuously heating and heat-insulating to make gas crystallize to obtain biological nucleated glass using apatite and fluorophlogopite as main crystal phase. Said product also contains a certain reinforced phase formed fronm leucite and wollastonite, and possesses good biological compatibility, machinability and beautifulness.

The invention relates to a ceramic material and a preparation method of the ceramic material, in particular to a graphene/leucite nano-composite ceramic material generated in a high-temperature in-situ mode and a preparation method of the graphene/leucite nano-composite ceramic material. The graphene/leucite nano-composite ceramic material and the preparation method aim to solve the problem that because graphene added into ceramic is poor in dispersity, the ceramic is poor in performance. The graphene/leucite nano-composite ceramic material generated in the high-temperature in-situ mode is prepared from a graphene oxide suspension, an alkali-activated solution and metakaolin powder. The preparation method comprises the steps of preparing the graphene oxide suspension, preparing the alkali-activated solution, preparing graphene oxide/alkali-activated mixed liquor, preparing graphene/aluminosilicate polymer precursor slurry, carrying out curing forming of a precursor, and carrying out high-temperature treatment. The preparation method can be used for preparing the graphene/leucite nano-composite ceramic material generated in the high-temperature in-situ mode.

The invention discloses a method for producing glass from purified granite scrap. The method comprises the following steps: weighing the following raw materials in parts by weight: 20-45 parts of high-whiteness potash feldspar and soda feldspar powder, 10-35 parts of spodumene, 20-45 parts of leucite, 15-45 parts of kieselguhr, 10-40 parts of magnesite, 5-25 parts of plant ash, 3-20 parts of graphene, 1-12 parts of potassium acetate, 5-25 parts of zinc oxide, 1-20 parts of calcium sulfide and 1-20 parts of mirabilite; uniformly mixing the high-whiteness potash feldspar and soda feldspar powder, the spodumene, the kieselguhr and the leucite, performing microwave roasting, adding water to prepare a suspension, performing high-speed grinding, and performing spray drying to obtain powder particles; uniformly mixing the powder particles with the magnesite, the plant ash and the graphene, and heating until all the materials are molten; and adding the remaining raw materials, stirring, blanking, performing water quenching, drying, smelting, and molding through a mold to obtain the glass. The glass produced by the invention has excellent chemical corrosion resistance, is especially tolerant to strongly-acidic and strongly-basic environments, has long service life and high refractivity, can meet the corrosion resistance requirements of different reflecting films, and has a wide application range.

The present invention provides for the production of a single frit, dental porcelain, glass-ceramic containing small, uniformly dispersed, single leucite crystals of ellipsoidal habit and very uniform size.

The invention discloses a customized fixed partial denture porcelain veneer. Porcelain powder with leucite as the main ingredient is directly used for paste-on-paste decoration of tooth repair form. The porcelain veneer comprises SiO2, Al2O3, K2O, Na2O, Li2O, BaO, B2O3, CaO, Sb2O3, ZrO2, SnO2, CeO2, F and TiO2. A method for preparing the porcelain veneer comprises the steps of making a high-temperature resistant tooth die, conducting pretreatment and soaking on the die so that porcelain coating and sintering can be conducted, coating combination porcelain, dentin porcelain and cutting porcelain in sequence, conducting sintering in a sintering furnace at different temperatures every time porcelain coating is conducted, conducting form polishing and finishing after sintering, then conducting glazing, conducting sintering in the furnace again, removing the die material, and taking off the veneer with overall thickness of 0.5-0.7 mm. The veneer has high tissue compatibility, stable chemical performance and high breaking strength, the color of the veneer can be adjusted to be matched with natural teeth, and a basis is laid for clinical application of porcelain repair of oral cavity.

The invention discloses a 12000 T/D kiln outlet special-use castable and belongs to the field of fireproofing materials. The castable inclues the components, by weight, 15-25% of mullite, 10-20% of sillimanite, 25-30% of tabular corundum, 5-10% of strontium titanate powder, 5-8% of zirconium dioxide powder, 1-3% of zinc-aluminium spinel powder, 3-5% of boron nitride, 5-10% of aluminum oxide micro powder, 4-6% of pure calcium aluminate cement, 0.2% of polylactic acid fibers, 0.1% of sodium hexametaphosphate, 0.1% of leucite and 0.1% of C12H14N4O5S2. The castable is improved in thermal shock resistance, high-temperature resistance, volume stability and wear resistance, is high in strength, is improved in the defects that a kiln outlet is not wear-resistant and is poor in thermal shock resistance, and can prolong the service life of a kiln outlet of a cement kiln from about 10 months to 2 years and more.

The invention discloses an ageing cracking resistant ceramic bowl and its preparation method. The ceramic bowl is prepared from the following raw materials, by weight, 33-47 parts of meerschaum, 25-35 parts of leucite, 22-33 parts of barite, 18-26 parts of nacrite, 15-25 parts of glass flake, 4-8 parts of tea dust, 3-6 parts of calcium hexaboride, 9-16 parts of konjaku flour, 4-7 parts of soya lecithin, 2-4 parts of disodium ethylene diamine tetraacetate, 3-5 parts of poly-aluminum ferric silicate sulfate, 2-3 parts of CITREM, 4-6 parts of alkali lignin and 8-10 parts of antimicrobial powder. With addition of glass flake, tea dust and calcium hexaboride, chemical corrosion resistance and ageing resistance of ceramic tiles can be enhanced. In addition, with addition of konjaku flour, soya lecithin, poly-aluminum ferric silicate sulfate and the like, adhesive stress among mineral particles can be raised, and ageing cracking of ceramic tiles can be prevented effectively. The prepared ceramic bowl has excellent heat resistance, corrosion resistance and ageing resistance, is not easy to crack or break and has long service life.

The invention discloses a wear-proof and anti-seismic tile and a preparation method thereof. The tile is prepared from raw materials in parts by weight as follows: 25-35 parts of waste clay bricks, 22-33 parts of marine dredged mud, 19-31 parts of yellow phosphorus slag, 14-26 parts of indianite, 18-30 parts of Huanglong mountain green mud, 23-34 parts of leucite, 16-28 parts of vesuvianite, 24-36 parts of metallurgy waste residues, 27-39 parts of periclase, 17-29 parts of brown fused alumina residues, 8-16 parts of aluminum diboride, 15-25 parts of dihydrate gypsum and 18-26 parts of diamond grinding wheel wastes. The added diamond grinding wheel wastes, waste clay bricks and other raw materials can improve the wear resistance and the weather resistance of the tile, the added brown fused alumina residues, aluminum diboride and other raw materials can improve the anti-seismic property and the heat stability of the tile. The prepared tile has the advantages of being high in mechanical strength, wear-proof, anti-seismic, resistant to high temperature, weather-resistant, ageing-resistant and the like and is long in service life and good in environmental suitability.

A pressable dental ceramic comprising a mixture of glass and glass-ceramic frits. A refractory filler is also combined with the frits. The dental ceramic contains an amount of leucite less than about 35 percent by weight. Other additives may be included such as pigments, opacifying agents and fluorescing agents. The dental ceramic comprises a cellular-like microstructure comprised of glassy regions surrounded by clusters of leucite crystals distributed around those glassy regions forming a cellular three-dimensional network.

The invention relates to a preparing method of a dental ceramic composite material. The method includes mixing 15.00-25.00% by mass of K2O, 20.00-30.00% by mass of Al2O3, 48.00-60.00% by mass of SiO2, 1.50-7.00% by mass of CaO, 0.05-1.00% by mass of MgO, 0.01-0.10% by mass of Fe2O3 and 0.01-0.10% by mass of TiO2, adding 75-95% by mass of ethanol, grinding with the granularity of ground powder being controlled to be lower than 4 mu, drying, melting for form glass, smashing and grinding the cooled glass with the granularity of ground powder being controlled to be 4 mu or below, covering microcrystalline alumina ceramic with the ground powder with the thickness being 0.3-3 mm, pressing and performing isostatic cool pressing through a former, nucleating and performing crystallization heat treatment to obtain the dental ceramic composite material. Mechanical performances of the prepared dental ceramic composite material are better than those of leucite-enhanced dental microcrystalline glass at present, and physical and chemical performances of the prepared dental ceramic composite material are better than those of microcrystalline alumina ceramic at present, so that the dental ceramic composite material can be used as restorations for repairing tooth defects. The method is easily available in raw materials and simple in production process and has good development and application prospects.

The application discloses a preparation method of leucite. The method comprises the following steps: 1) adding aluminium hydroxide into a sodium hydroxide solution, carrying out a heating reflux reaction, filtering, washing, and collecting a filtrate to obtain a sodium metaaluminate solution; 2) adding the sodium metaaluminate solution into a mixed solution of a sodium silicate solution and polyvinylpyrrolidone, stirring and reacting to obtain a mixture; 3) carrying out a hydrothermal reaction on the mixture at 150-220 DEG C for 3-6 h, filtering, washing, and drying to obtain analcite; and 4) adding analcite into a potassium nitrate solution and carrying out a hydrothermal reaction at 150-250 DEG C for 3-6 h, filtering, washing and drying so as to obtain leucite. According to the method, leucite is prepared by combination of a hydrothermal method and an ion exchange method. The method has characteristics of low reaction temperature, easy operation, low energy consumption and no pollution. Particle size of leucite powder is controllable and small, and particle size distribution is narrow.