41results about How to "Expansion coefficient matching" patented technology

The invention relates to the technical field of display and discloses a flexible substrate, a preparation method of the flexible substrate and a flexible display device to solve the technical problems that as a rigid auxiliary substrate is prone to warping, the process precision is low when a display device is prepared. The flexible substrate comprises a first organic layer and an inorganic buffer layer which are sequentially stacked. An organic-inorganic composite structure is formed by the first organic layer and the inorganic buffer layer. The expansion coefficient of the inorganic buffer layer is smaller than the expansion coefficient of the first organic layer. Under the interaction of the first organic layer and the inorganic buffer layer which form the organic-inorganic composite structure, the expansion coefficient of the flexible substrate is reduced; the expansion coefficient of the flexible substrate is matched with the expansion coefficient of the rigid auxiliary substrate better, the risk that the rigid auxiliary substrate warps is reduced, and the process precision is increased when the display device is prepared. The flexible substrate is applied to the flexible display device.

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 invention discloses a ceramic binding agent for a ceramic grinding block and a preparation method thereof and belongs to the technical field of powder metallurgy materials. The ceramic binding agent aims at achieving the effects that the retention to diamond is good, the expansion coefficient is matched with expansion coefficients of silicon carbide, brown aluminum oxide and the diamond, and the sintering temperature of a finished product is low. The ceramic binding agent is formed by the following powder materials of, by weight, 20 to 55 kilograms of silicon dioxide, 5 to 25 kilograms of aluminum oxide, 0 to 5 kilograms of zinc oxide, 0 to 5 kilograms of titanium dioxide, 0 to 7 kilograms of zirconium oxide, 10 to 20 kilograms of sodium carbonate, 5 to 15 kilograms of lithium carbonate and 8 to 30 kilograms of boric acid. According to the ceramic binding agent for the ceramic grinding block, the ceramic grinding block has the advantages of being low in sintering temperature, good in self-sharpening, good in sharpness, long in service life, low in carbon and environmentally friendly.

The invention mainly relates to the technical field of ceramic glaze processing and discloses a method for decreasing glaze pinholes and bubbles; the method comprises: mixing materials, melting for the first time, quenching for the first time, melting for the second time, quenching for the second time, ball-milling and pulverizing, and glazing and firing; the method is simple and convenient to perform, and can decrease glaze pinholes and bubbles by 90.9% and save product cost by 21.2%; the raw materials are crushed, water is added for melting, mixing well the materials is facilitated, sodium nitrate solution is added for quenching, double melting and quenching are performed, emission of the gas from the materials is quickened, the stability, mobility and compactness of the glaze are improved, glaze can be applied evenly, the cost can be saved as low-temperature slow firing is performed, the glaze has bright color and zero pinholes and bubbles, has matching expansion coefficient, and has smooth surface, good corrosion resistance and service life extended by 16.4%.

The invention relates to a preparation method of colorful glazed rice-pattern decorated porcelain. The preparation method comprises the following steps: 1, selecting a high-temperature porcelain bodypug, and forming a green body; 2, biscuiting the green body prepared in the step 1; 3, preparing a colorful glaze material for ceramic decoration; 4, applying transparent glaze to the inner of the green body, and after drying, applying the prepared colorful glaze material to the outer surface of the green body; 5, carrying out secondary biscuiting on the prepared glazed body; 6, attaching rice-pattern decorated porcelain decorative patterns to the surface of the glazed body prepared in the step 5, and spraying rice-pattern decorated porcelain holes by adopting a sand blasting jet process; 7, preparing rice-pattern decorated porcelain glaze high in high temperature permeability for filling of the rice-pattern decorated porcelain holes; 8, carrying out water washing of the glazed body with the rice-pattern decorated porcelain holes, drying, and applying the rice-pattern decorated porcelain glaze, carrying out glaze firing at a high temperature of 1295 DEG C after glaze washing, and taking an obtained product out of a kiln to obtain the ceramic body decorated by the colorful glaze and the rice-pattern decorated porcelain glaze material. The colorful glaze from Jingdezhen and rice-pattern decorated porcelain are combined, the colorful rice-pattern decorated porcelain is obtained through whole new blank glaze formula and technological parameters, and a promising market prospect is achieved.

The invention belongs to the field of a microwave device and relates to a preparation method of an aluminum nitride insulation layer cathode hot wire formed, with the aluminium nitride materials being as raw materials and through an electrophoretic deposition method, by preparing a layer of compact aluminium nitride ceramic coating on the surface of the cathode hot wire for a travelling wave tube. Aluminum nitride powders are subjected to ultrasonic dispersion through organic solvents of alcohol and the like to obtain a stable suspension liquid; a layer of aluminium nitride film is deposited on the surface of a cleaned tungsten-rhenium wire through electrophoretic deposition; and the cathode hot wire having the compact aluminium nitride insulation layer is obtained after high-temperature sintering. The method is simple in process and low in device requirement; the coating and the tungsten-rhenium wire have better thermal expansion matching; the coating is not easy to crack or shed, and the coating has the advantages of high thermal conductivity and large resistivity; and the prepared coating hot wire is long in service life and high in reliability.

The invention discloses a frit composition which comprises a frit base material and filler, wherein the filler comprises a quasi-crystal material which accounts for 5-45wt% of the total weight of the filler. The frit composition, and the frit paste composition have negative thermal expansion coefficients, the thermal expansion coefficient of the frit can be reduced very well, so that the expansion coefficients of the frit and the base plate are further matched. Furthermore, a channel for discharging gross blow holes is provided and the compactness and adhesive strength of the frit composition are improved, so that the packaging yield is further improved and the OLED (Organic Light Emitting Diode) packaging stability is improved.

The invention mainly relates to the technical field of ceramic glaze processing, and discloses a heat-resistant and environmentally friendly glaze for tableware, which is made of the following raw materials: silicon dioxide, zinc oxide, iron nitride, graphene, aluminum oxide, di Niobium, vanadium boride, cobalt oxide, white carbon black, salt, antibacterial agent; rich in raw materials, enhance the heat resistance and wear resistance of the glaze, the resistance to rapid change in cold and heat reaches 193.1K, and the biaxial bending strength increases by 58.1%. Prevent the glaze layer from falling off after bumping, prolong the service life, and the antibacterial time can be as long as 10 years in normal use; adding salt and antibacterial agent can reduce air bubbles, increase the fineness, density and fluidity of the enamel, and match the expansion coefficient. Keep the enamel smooth, the antibacterial rate reaches 66.1%, after short-term high-temperature firing, maintain the original color of ceramic products, strong stability, corrosion resistance, save production costs by 17.8%, safe and environmentally friendly, green and healthy, free of lead and cadmium dissolution, Health and Environmental Protection.

The invention relates to a preparation method of colorful rice-pattern decorated porcelain. The preparation method comprises the following steps: 1, selecting a high-temperature porcelain body pug, and forming a green body by grouting or rolling; 2, biscuiting the green body prepared in the step 1; 3, attaching rice-pattern decorated porcelain decorative patterns to the surface of a glazed body prepared in the step 2, and spraying rice-pattern decorated porcelain holes by adopting a sand blasting jet process; 4, preparing a colorful rice-pattern decorated porcelain glaze material for ceramic decoration; 5, washing the green body sprayed with the rice-pattern decorated porcelain holes in the step 3 with water, drying, applying the colorful rice-pattern decorated porcelain glaze material tothe interiors of the rice-pattern decorated porcelain holes, and cleaning the colorful rice-pattern decorated porcelain glaze material remaining on the surface of the green body; and 6, applying transparent glaze to the inner and outer surfaces of the green body prepared in the step 5, carrying out glaze firing at a high temperature of 1295 DEG C, and taking out of the kiln to obtain the ceramic body decorated by the colorful rice-pattern decorated porcelain glaze material. The colorful rice-pattern decorated porcelain is obtained by designing a brand-new body glaze formula and technological parameters, so that the colorful rice-pattern decorated porcelain has a wide market space.

The invention discloses lead-free transparent frit for preparing ceramics, and particularly relates to the field of ceramic preparation. The lead-free transparent frit comprises main ingredients and accessory ingredients, wherein the main ingredients mainly comprise SiO2, B2O2, Al2O3, ZnO, Li2O, Na2O, MgO, K2O and CaO, and the accessory ingredients mainly comprise SrO, Bi2O3, Re, nitrate, titaniumpowder and vanadium pentoxide. Firing is conducted by using a lithium-containing compound or mineral spodumene and Suzhou soil as raw materials, a chemical substances formed through firing replaces PbO in lead-containing glaze, and the minimum eutectic mixture is formed together, and therefore, lead oxide is replaced. A low glaze firing temperature and a wide firing range are ensued, the glaze glossiness can be ensured, and matching of the expansion coefficient can be ensured. Li2O is an oxide with a strong melting function, the expansion coefficient of the glaze can be significantly reduced,and the durability is improved; when the Li2O is added into the frit, the lead-free transparent frit which is high in elasticity and high in glossiness can be obtained at a low glaze firing temperature, B2O2 can obviously reduce the melting temperature and the viscosity of the frit, and the B2O2 can be used as a strong fluxing agent.

The invention provides a high thermal conductivity metal base circuit board and a preparing method thereof. The circuit board comprises a metal base plate, a thermal conducting insulation layer arranged on the surface of the metal base plate, and a circuit formed on the thermal conducting insulation layer. The material of the thermal conducting insulation layer includes paint with following components by mass percentage: 40-60% by mass of a mixture of polyethylene glycol terephthalate and polybutylene terephthalate; 30-40% by mass of a mixture of aluminum oxide, aluminium nitride and boron nitride powder; 5-10% by mass of cosolvent; 3-10% by mass of diluent; and 0.5-1% by mass of curing agent. The above mentioned components account for 100% of the total mass percentage content. The heat conduction coefficient of the metal base circuit board ranges from 5W/k.M to 15W/k.M, enabling the metal base circuit board to achieve effective heat conduction, and therefore, the stability and service lifetime of an electronic component can be improved. It is also possible to make a circuit, including an abnormal-shaped circuit on a metal carrier, providing a new method to attain circuit boards of different purposes. The invention also provides a preparing method for such high thermal conductivity metal base circuit board.

The invention discloses a heat sink material for power devices and a preparation method thereof, and belongs to the technology field of members of power devices. The heat sink material for power devices is prepared from (by weight parts) copper 5-20 and tungsten 80-95 by compounding, pressure moulding, sintering and post treatment. The inventive heat sink material for power devices has expansion coefficient matched with semiconductor materials and high thermometric conductivity, and can satisfy the requirements of high-power devices. The inventive heat sink material also has directional heat-conducting property.

The invention discloses substrate glass for optical communication, a glass preform, an optical element and an optical instrument. The substrate glass comprises the following components in percentage by weight: 30-50% of SiO2; 10 to 30 percent of TiO2; 15 to 30 percent of R2O; 0.5 to 10 percent of Al2O3; 0 to 10 percent of Y2O3; 0 to 10 percent of La2O3; 0-20% of MO; wherein R2O is at least one ofLi2O, Na2O and K2O; and M is at least one of Mg, Ca, Sr, Zn and Ba. According to the invention, the effects of SiO2, TiO2, R2O, Al2O3, MO, La2O3 and Y2O3 in the formula are comprehensively considered;all the components have a mutual synergistic effect; the dosage of each component is reasonably set; the cooperative mechanism is balanced, finally, the prepared substrate glass for optical communication has relatively high transmittance in a wave band of 960 to 1600nm; and the optical communication substrate prepared by the method does not change color under irradiation of space rays, has high elasticity modulus, has an expansion coefficient matched with that of a plated film, has better heat resistance compared with an optical communication substrate prepared from plastic, and has a lower cost compared with an optical communication substrate prepared from microcrystalline glass.

The invention mainly relates to the technical field of ceramic glaze processing, and discloses a high-temperature environment-friendly colored glaze. The high-temperature environment-friendly colored glaze is prepared from the following raw materials: silicon dioxide, magnesium oxide, iron nitride, niobium pentoxide, vanadium boride, silicon nitride, aluminum nitride, zirconium oxide, cerium dioxide, hornblende, hard clay, table salt and pigments. A glaze surface becomes flat and smooth through short-time high-temperature burning and expansion coefficient matching, energy is saved, and no lead is dissolved out; the high-temperature environment-friendly colored glaze is safe, nontoxic and environment-friendly, and the production cost is lower by about 12.6 percent; the raw materials are mixed after being subjected to one-time ball milling, and are then subjected to repeated melting, quenching and ball milling, so that the colored glaze is fine and smooth in texture; the table salt is added after primary quenching, so that the high-temperature environment-friendly colored glaze is convenient to be added with water and mixed uniformly in use, and has the advantages of fineness, high fluidity, uniform glazing and smooth texture; the pigments are added after second melting, and high-temperature calcination is performed, so that the stability of the colored glaze and the pigments are enhanced, and the colored glaze is gorgeous, uniform in brightness and colorfast.

The invention belongs to the technical field of ceramic preparation, and discloses a Yangwuling-kiln ceramic product with a circularly engraved pattern and a preparation method thereof. The preparation method comprises the following steps of making into a brick-shaped clod by adopting china stone from an ore district, carrying out throwing through the bending and stretching of a turn-table freehand method, covering a printed mold through a printing mold, then cooperating with the rotation of a turning disc through a convenient barrel to carry out fine trimming, and putting a finely trimmed ceramic on a wooden stand to carry out airing; engraving the well aired ceramic by using a bamboo, bone or iron knife tool, afterwards, glazing the internal and external surfaces of the ceramic, then putting the ceramic into a saggar to carry out kilning, taking out after the firing is completed, next, carrying out colored drawing on glazed surfaces, and finally putting into a decorating kiln to carry out low-temperature fire-baking. The method is explicit and clear; the steps from clod making to the fire-burning are all introduced in detail; the preparation success rate and attractiveness of theceramic are greatly improved; the production efficiency and the profit are improved, and the method has prodigious popularization value and significance.

.The invention discloses a manufacturing method of a box dam ceramic substrate for ultraviolet LED packaging and a product thereof. According to the method, local localized heating instead of overallheating is carried out on the contact surface of the ceramic substrate and the box dam through laser, so that the process is simple and energy-saving, batch production is facilitated, and thermal damage to original circuit metal of the ceramic substrate caused by high temperature is effectively avoided Meanwhile, compared with existing gluing or reflow soldering, laser welding forms reliable welding, welding points can bear higher temperature, and the reliability is higher; compared with an existing metal box dam, the box dam is made of glass or ceramic or glass ceramic or sapphire materials,the expansion coefficient of the box dam is better matched with that of the ceramic substrate, and the product reliability is further improved. Meanwhile, the metal coating is arranged on the inner wall of the box dam, ultraviolet light can be well reflected, the problem of ultraviolet light absorption is avoided, the comprehensive performance is good, and wide application and popularization are facilitated.

The invention discloses a production process of a high-hardness ceramic tile, and belongs to the technical field of ceramic tile production. The production process comprises the following steps: taking materials, selecting sufficient pug, sand, a blank body and a blank body reinforcing agent, taking the sand material and the blank body, putting the sand material and the blank body into a ball mill, and carrying out ball milling. By properly increasing the content of aluminum oxide in the ceramic tile formula and adding a proper amount of blank reinforcing agent, the deformation degree of the prepared ceramic tile can be effectively reduced, the high-temperature non-deformability and drying strength of the material are improved, the thermal expansion coefficient of the blank is reduced, the expansion coefficients of the later material and glaze are better matched, the glaze quality is ensured, and glaze forming rate is improved. Meanwhile, a slurry sieving process and a multi-time iron removal process are set, coarse particles and some impurities which are not finely ground during ball milling can be effectively removed through sieving, the situation that black spots, molten holes, impurities and other defects are formed on the surface of the ceramic tile can be effectively avoided through multi-time iron removal, meanwhile, the whiteness of the ceramic tile is guaranteed, the quality of the ceramic tile is improved, and the application effect of the method is improved.