169results about How to "High expansion coefficient" patented technology

A fritted glaze without Pb and Zn for ceramics contains SiO2, Al2O3, CaO, MgO, K2O, Na2O, SrO, Li2O, B2O3, Fe2O3, Bi2O3 and Y2O3 proportionally. Its advantages are high adhesion, smooth and bright surface, and gay color.

The application relates to the technical field of display, and particularly relates to a thin film packaging method and structure. The thin film packaging method disclosed by the application at least comprises the following steps of: sequentially preparing a first inorganic material layer, an organic material layer and a second inorganic material layer on the surface of a device to be packaged, and when the first inorganic material layer and/or the second inorganic material layer is prepared, firstly, preparing an inorganic layer A by adopting a physical vapor deposition method or a chemical vapor deposition method, and then preparing an inorganic layer B on the surface of the inorganic layer A by adopting an atomic layer deposition method; or, preparing the inorganic layer B by adopting the atomic layer deposition method, and then preparing the inorganic layer A on the surface of the inorganic layer B by adopting the physical vapor deposition method or the chemical vapor deposition method. According to the thin film packaging method and structure disclosed by the application, a composite inorganic layer prepared by utilizing the physical vapor deposition method or the chemical vapor deposition method and the atomic layer deposition method is gradually varied in density, so that a deviation of coefficients of thermal expansion of the prepared inorganic layer and organic material layer is reduced, and bending resistance of a display screen is improved.

The invention belongs to the technical field of enamel material, and specifically relates to a vanadium-titanium enamel glaze material, and a preparation method thereof. The preparation method is used for solving technical problems that cost of a conventional vanadium-titanium enamel glaze material is high, glossiness of enamel glaze obtained via sintering is not high enough, fishscaling is observed, and acid and alkali resistance is not high enough. The vanadium-titanium enamel glaze material is prepared from, by mass, 22 to 28 parts of pretreated vanadium-titanium magnetite titanium separation tailing or vanadium-titanium boundary ore, 20 to 22 parts of feldspar powder, 5 to 8 parts of quartz sand, 24 to 26 parts of borax, 1.5 to 2 parts of sodium nitrate, 3.5 to 5.5 parts of lithium carbonate, 5 to 7 parts of fluorite powder, 0.1 to 0.3 part of sodium fluosilicate, 3 to 5 parts of cryolite, 2 to 4 parts of limestone, 3 to 4 parts of cobalt nitrate, 1 to 2 parts of nickel nitrate, 2 to 3 parts of sodium vanadate, and 1 to 2 parts of antimony oxide. Firm combination of the vanadium-titanium enamel glaze material with carbon steel billet can be realized; acid and alkali resistance is higher than that stipulated by national standard; and the vanadium-titanium enamel glaze material can be used for a plurality of matrixes such as hot-rolled carbon steel and cast iron.

The present invention provides a composite structure having a supporting substrate between a piezoelectric substrate and a compensation layer. The materials used to form the piezoelectric substrate and the compensation layer in isolation, have higher thermal coefficients of expansion (TCE) relative to the TCE of the materials forming the supporting substrate. Once the composite structure is created, the piezoelectric substrate and compensation layer tend to expand and contract in a similar manner as temperature changes. The expansion and contraction forces applied to the supporting substrate by the piezoelectric substrate due to temperature changes are substantially countered by similar opposing forces applied by the compensation layer, resulting in the opposing forces substantially counteracting one another. Due to the counteraction, the composite structure resists bending or warping, reducing expansion and contraction and increasing stress of the piezoelectric substrate, and thus reducing the effective TCE and TCF of the piezoelectric substrate.

The invention discloses a wear-resistant antifouling glazed brick glaze and a preparation method thereof. The wear-resistant antifouling glazed brick glaze comprises raw glaze powder, No.1 frit powderand No.2 frit powder, wherein the raw glaze powder comprises the following raw materials in percentage by weight: 8-12% of kaolin, 10-18% of calcined kaolin, 12-20% of quartz, 12-20% of dolomite, 8-15% of calcined talc, 1-5% of wollastonite, 8-15% of nepheline, 5-10% of zinc oxide, 0-5% of calcite and 6-12% of strontium carbonate, wherein the No.1 frit powder is prepared from kaolin, calcined talc and fluorite, and the No.2 frit powder is prepared from zinc oxide, strontium carbonate and borax. The wear-resistant antifouling glazed brick glaze contains a large number of cordierite microcrystals, and the cordierite microcrystals have the characteristics of transparency, high hardness and the like, so that the wear resistance and the antiskid effect of a glaze layer can be enhanced, and thecontradiction between the transparency and the wear resistance of the glaze layer can be solved.

The invention discloses sealing glass powder for electric connectors. According to the sealing glass powder, silicon dioxide serves as a skeleton structure and serves as a network forming body of glass, and an extremely small amount of alkali metal element is used, so that the melting temperature is lowered, the coefficient of expansion is increased, and the influence on high-temperature insulating properties of the glass is relatively low; alkaline-earth metal oxides such as MgO, CaO, SrO and BaO are added, and network gaps are filled with cations, i.e., Mg<2+>, Ca<2+>, Sr<2+> and Ba<2+> of MgO, CaO, SrO and BaO and a mixed base effect and a depressing effect are generated, so that the movement of alkali metal ions is hindered, and thus the insulating properties of the glass is improved; due to relatively high content of BaO, the material properties of the glass can be improved, and the high-temperature insulating properties of the glass is greatly improved; due to the addition of Al2O3, an AlPO4 unit can be formed in the glass, and a straight chain is changed into a network structure, so that the structure of the glass is stabilized, and the chemical stability is improved; in addition, by adding oxides such as ZnO, TiO2, ZrO2 and V2O5, the improvement on the chemical stability and electrical insulating performance of the glass is facilitated.

The invention discloses a coating for lost foam casting and a preparation method of the coating. The coating comprises the following components: a refractory aggregate, a binder, a suspending agent and water, wherein the refractory aggregate comprises quartz sand and bauxite, and the weight ratio of quartz sand to bauxite is 3:7 to 4:6. The preparation method comprises the following steps: step 1, stirring and mixing the quartz sand and the bauxite to obtain the refractory aggregate, wherein the weight ratio of the quartz sand to the bauxite is 3:7 to 4:6; step 2, adding water into the refractory aggregate and stirring, wherein the weight ratio of the water to the refractory aggregate is 0.7 to 0.9; step 3, adding the binder into the mixture of the refractory aggregate and water and stirring. According to the invention, the coating has better performance and lower cost and is particularly suitable for lost foam casting of cast iron workpieces.

The invention discloses a preparation method of a tetramethyl bisphenol F epoxy resin, belonging to the technical field of epoxy resins. The tetramethyl bisphenol F epoxy resin is prepared from 4,4'-methylene-bis(2,6-dimethyl)phenol and epoxy chloropropane in a mass ratio of 1:3-1:10. The preparation method comprises the following steps: (1) adding the 4,4'-methylene-bis(2,6-dimethyl)phenol and epoxy chloropropane, adding a cosolvent, adding an alkaline catalyst at 40-70 DEG C in a nitrogen protective atmosphere, reacting for 1-4 hours, adding an alkaline catalyst, reacting in a vacuum for 2-7 hours, and recovering the epoxy chloropropane under reduced pressure; and (2) adding a solvent and an alkaline catalyst, after the reaction finishes, washing with water to a neutral state, and removing the solvent to obtain the product. The tetramethyl bisphenol F epoxy resin obtained by the preparation method has lower melting point and viscosity, can implement high filling content in the semiconductor packaging material, and especially has favorable application prospects in the field of high-performance electronic packaging.

The invention relates to a low stray light crosstalk type optical fiber image transmission component and a manufacturing method thereof. The optical fiber image transmission component comprises at least three cylindrical single optical fibers which are tightly stacked in parallel, wherein a space encircled by position at which any two of the three single optical fibers are tangent forms a light absorption glass jack; each light absorption glass jack is filled with light absorption glass; and the single optical fibers are composed of cylindrical fiber core glass rods with high refractive index and channel glass pipes with low refractive index coated outside the cylindrical fiber core glass with high refractive index. According to the low stray light crosstalk type optical fiber image transmission component disclosed by the invention, the stacking space is completely filled with the absorption glass, the stray light crosstalk of the optical fiber image transmission component is reduced, and the imaging definition is improved.

The invention relates to a preparation method and an application of high expansion coefficient copper sealing glass powder, wherein the technical difficult problems of high cost, long production period, high use environment requirements and the like of the existing copper seal electrical connector are solved. The high expansion coefficient copper sealing glass powder adopts a phosphate glass system and comprises the following components by mole: 45-65% of P205, 10-15% of B203, 4-15% of Al2O3, 5-20% of Na2O, 8-22% of K2O, and 0-12% of PbO+BaO+CaO+MgO. The application comprises: carrying out mixing, heating, stirring, molding, drying and other steps on the glass powder and a paraffin thin sheet, assembling a sealing copper shell and a glass billet, placing on a graphite mold, placing into a nitrogen atmosphere furnace or vacuum furnace, carrying out thermal insulation for 30 min at a temperature of 600-780 DEG C, and cooling to a room temperature to obtain the electrical connector with characteristics of high temperature resistance, high resistivity and high air-tightness. According to the present invention, the glass powder can match to the copper alloy shell expansion coefficient, the produced copper alloy electrical connector can achieve good electrical property, the preparation method is suitable for industrial production, and the economic benefits can be increased.

The invention relates to a ceramic modification C/C composite material with a ceramic coating layer and a preparation method thereof. The preparation method of the ceramic modification C/C composite material comprises the following steps of performing density increase on a carbon fiber prefabricated body by a chemical vapor deposition process to obtain C/C porous bodies; performing more than once soaking-cracking process on the C/C porous body until the density of the ceramic modification C/C composite material reaches 1.8g/cm<3> or higher; obtaining the ceramic modification C/C composite material. According to the preparation method of the C/C composite material with the ceramic coating, a ceramic outer coating layer is mainly prepared on the surface of the ceramic modification C/C composite material. The method solves the problem of heat expansion coefficient unbalance of the base body and the coating, and has the advantages that the equipment and the process are simple; the operation is easy; the coating structure content is controllable; large-dimension and complicated-shape special-shaped workpieces can be prepared, and the like; great engineering application potential is realized.

The invention discloses a silver paste of a high-performance lead-free crystalline silicon solar battery back electrode. The silver paste comprises, by weight, 30 to 58% of silver powder, 1 to 5% of lead-free glass powder, 0.01 to 10% of graphene, 0 to 1% of inorganic additive, 40 to 68% of an organic adhesive, and 0. 1 to 2% of an auxiliary agent. The mixed silver powder is a mixture including irregularly-shaped silver powder and silver powder with a high specific surface area. In addition, the invention also discloses a preparation method for the silver paste of the high-performance lead-free crystalline silicon solar battery back electrode. Graphene, an auxiliary agent, and a part of organic adhesive are mixed and then the mixture is rolled to form a slurry, so that a graphene slurry is obtained; silver powder, lead-free glass powder, an inorganic additive, and the rest of organic adhesive are mixed and stirred uniformly and then the graphene slurry is added; and stirring and mixing are carried out continuously and uniformly, so that a needed silver paste is obtained. According to the invention, the fusion and contact with an aluminum back field are improved; the contact resistance between the silver electrode and the aluminum back field is reduced; the conversion efficiency of the battery piece is improved; and the electrode weldability and soldering resistance performance are enhanced.

The invention relates to the field of glass and particularly relates to alkali-free silicate glass and a preparation method and application thereof. The alkali-free silicate glass comprises, by mole, 65-75 mol% of SiO2, 11-17 mol% of Al2O3, Ga2O3 and GeO2, 0-8 mol% of B2O3, 0-15 mol% of MgO, 2-10 mol% of CaO, 0.5-14 mol% of SrO and BaO, 0-10 mol% of TiO2, 0.01-2 mol% of Ta2O5 and 0.01-0.5 mol% of Tl2O3. The alkali-free silicate glass has high thermal stability and dimensional stability, a high strain point, a high specific modulus, a low melting temperature, a low liquidus temperature and low density and is suitable for large-scale industrial production.

The invention provides an oil reservoir three-dimensional gas injection method and a well pattern structure. The oil reservoir three-dimensional gas injection method comprises steps of simultaneously injecting gas to the top portion and the lower portion of an oil reservoir, wherein gas-injection wells for the lower portion of the oil reservoir are a part of watered-out wells which are arranged at the lower portion of the oil reservoir 1-2 years ago before gas injection. The invention also provides the oil reservoir three-dimensional gas injection well pattern structure comprising multiple horizontal production wells and multiple horizontal gas injection wells. The horizontal wells in adjacent rows in the same plane are arranged in a staggered manner, and the horizontal wells in the adjacent layers in the vertical view are also arranged in a staggered manner, so that the three-dimensional gas injection well pattern structure in which the horizontal wells are arranged in a staggered manner in the plane and vertical views is formed. The oil reservoir three-dimensional gas injection method and the well pattern structure can effectively improve the oil extraction efficiency.