37results about How to "Wide firing temperature" patented technology

The VHF slice type inductance and the slice type bead material are obtained by sintering the admixture of BaSrPbZnCoCu and the sintering supporting agent being mixed according to certain weight percentage rate. Fe2O3, BaCO3, SrCO3, PbO, Co3O4 etc. are used as the main materials to prepare BaSrPbZnCoCu. The composite sintering supporting agent is prepared from Bi2O3+Al2O3+PbO+B2O3+SiO2+CaF2+LiF. The material possesses the properties of magnetic permeability 2-40, cut-off frequency 800 MHz to more than 1.8 GHz, the variety rate of specific temperature less than 10 to the power -6 / deg.C and resistivity larger than 10 to the power 9 ohm.cm. The invention realizes the low temperature sintering, providing the features of high density, the even size of crystal grain and the stable performance.

The invention relates to a powder green glaze material, which is a slurry obtained by mixing the powder green glaze raw materials according to the formula, and then through ball milling, sieving, and iron removal processes, including powder after dehydration and drying. A proper amount of talc, chromium oxide and other raw materials are introduced into the formula, which solves the problems of over-burning, foaming and "smoking" in the process of high-temperature melting of traditional blue-glazed ceramics. The glaze is green, smooth, delicate, gorgeous and pure in color. The quality is as clean as jade; the invention also discloses a method of using the powder green glaze to manufacture ceramic products at the same time. The powder green glaze ceramic products produced by the method have high yield, good density and strong acid and alkali corrosion resistance.

The invention discloses a medium and low sintering temperature stable ceramic capacitor material and a preparation method. The material comprises BaTiO3 as a main material, together with 1-7% of mass of sintering assistant and 0.5-9.5% of mass of metal oxide. The sintering assistant comprises the following raw materials by mass percentage: 1-26% of Bi2O3, 1-24% of K2CO3, 1.2-22% of ZnO, 1.5-28% of CaF2, 2-28% of P2O5 and 3.5-32% of CaO, and the metal oxide comprises the following raw materials by mass percentage: 1-28% of Nb2O5, 0.2-30% of MgO, 0.5-32% of WO3, 0.3-27% of CaTiO3 and 0.1-33% of CuO. The material has a wide sintering temperature (850-1050 DEG C), and is low in dielectric loss, high in dielectric constant, stable in performance, high in mechanical strength, high in reliability, good in uniformity and environment-friendly; a working temperature zone is from -55 DEG C to +250 DEG C; and the material meets severe environment requirements.

The invention discloses an acid-corrosion-resistant enamel coating on the surface of weather-resistant structural steel and a preparation method thereof. The preparation method of the acid-corrosion-resistant enamel coating on the surface of weather-resistant structural steel of the present invention comprises: a) melting enamel glaze, b) preparing enamel glaze powder, c) alkaline degreasing treatment of weather-resistant structural steel, d) enamel coating Spraying and firing at high temperature, wherein, the enamel glaze material has two kinds, which are enamel enamel A and enamel enamel B respectively. The acid-corrosion-resistant enamel coating on the surface of the weather-resistant structural steel obtained by the preparation method of the invention has the advantages of excellent acid-corrosion resistance, especially sulfuric acid resistance, high bonding strength, and long service life. In addition, the preparation method of the present invention is simple, adopts two kinds of glazes to be melted separately, and the surface of the weather-resistant structural steel is treated with alkaline degreasing, which improves production efficiency, saves energy consumption, reduces the production cost of enamel coating, and is suitable for large-scale popularization and application. .

The invention discloses a high-strength pink zirconia ceramic powder, the chemical composition of which is zirconia and an added oxide; the content of the added oxide is 0.5-4.0 mol% of erbium oxide, yttrium oxide 0.5-4.0 mol%, magnesium oxide 0.1-0.3 mol%, aluminum oxide 0.1-0.3 mol%. In addition, the preparation method and application of the above-mentioned high-strength pink zirconia ceramic powder are also disclosed. The powder raw material with stable composition and excellent performance obtained by optimizing the composition of the formula in the present invention is conducive to obtaining pink aesthetic ceramic products with high strength, good toughness, good color development, high moisturization and few surface defects, so that it can be well It can fully meet the stringent processing requirements in practical applications, and is conducive to broadening its application fields, with significant economic benefits and broad application prospects.

The present invention provides a high quality factor microwave dielectric ceramic material substituted by B position and its preparation method. The B position is substituted to achieve the purpose of controlling the microwave properties of the system; M represents Nb whose valence is higher than tetravalent, N represents one or several other elements whose valence is lower than tetravalent and the ionic radius is similar to Ti, and M and N are simultaneously Substituted or replaced alone; the preparation method is to determine the respective mass percentages according to the general chemical formula, mix by ball milling, pre-calcine at 1050-1150°C, and then sinter at 1350-1450°C; the dielectric constant of the prepared material ( 70~100) and frequency temperature coefficient are adjustable while maintaining excellent Q×f value (9000GHz~16000GHz), the formula does not contain volatile or heavy metals such as Pb and Cd, and the performance is greatly improved compared with other systems. Raw materials The domestic supply is sufficient, and the price is relatively low compared to other systems, which makes it possible to reduce the cost of high-performance microwave ceramics.

The invention discloses a preparing method of polyphase functionality honeycomb ceramic supporting body, which comprises the following steps: choosing titanium white, silica dioxide and aluminum oxide as main raw material; doping rare earth; adding right amount magnesium oxide accelerating burnt agent and additive; mixed-refining; squeezing; forming; drying; calcining for 2-3 h under 1200-1500 deg. c; generating the product with aluminium titanate and red schorl as principal crystalline phase. This product possesses shockproof, corrosion resistant, high intensity and good association with coated carrier, which can be used to the carrier of car exhaust gas cleansing activator and carrier reactor of photocatalyzer.

The invention discloses a preparation method of aluminum oxide granulation powder specially used for hot-pressed water valve sheets, and belongs to the technical field of new materials. This method uses optimized special alumina powder as the main raw material, and uses a unique ball milling process to control the particle size gradation of the mud; using compound additives to modify the surface of the granulated powder to achieve wet spraying, the granular granulated powder can reach a similar level during use. The effect of dry grinding granulated powder (micro powder). The prepared alumina granulated powder is suitable for hot die-casting equipment of various manufacturers in the market, and the fired products have high precision, no deformation and good polishing effect.

The invention discloses a medium and low sintering temperature stable ceramic capacitor material and a preparation method. The material comprises BaTiO3 as a main material, together with 1-7% of mass of sintering assistant and 0.5-9.5% of mass of metal oxide. The sintering assistant comprises the following raw materials by mass percentage: 1-26% of Bi2O3, 1-24% of K2CO3, 1.2-22% of ZnO, 1.5-28% of CaF2, 2-28% of P2O5 and 3.5-32% of CaO, and the metal oxide comprises the following raw materials by mass percentage: 1-28% of Nb2O5, 0.2-30% of MgO, 0.5-32% of WO3, 0.3-27% of CaTiO3 and 0.1-33% of CuO. The material has a wide sintering temperature (850-1050 DEG C), and is low in dielectric loss, high in dielectric constant, stable in performance, high in mechanical strength, high in reliability, good in uniformity and environment-friendly; a working temperature zone is from -55 DEG C to +250 DEG C; and the material meets severe environment requirements.

This invention relates to a glass corbel and flower piece. According to weight, the key components are: quartz sand 50.6 to 56.6%, sodium carbonate 22.5 to 25.8%, mountain meal 10.3 to 14.5%, borax 3.1 to 3.6%, opacifier 2.3 to 5.8%, alumina 0 to 3.9%, toner 0 to 1.3%; this invention also discloses the manufacturing method. The production process: pattern design ->film out->drying->hunk glass cutting->snippet glass cutting-> printing bottom white-> printing bottom closing glue->incising->planking->burning->edging->sorting->casing; the printing mesh is 250; flower glaze specific gravity is 1.64 to 2.70g / cm3; flower glaze printing quantity: 150g / cm2; this invention can reduce cost about 20%.

The invention belongs to the metal material field, in particular to a hexagonal soft magnetic ferrite material that can be sintered at a low temperature directly. The invention is characterized in that the invention adopts Bi2O3 as one of the constituent, and replaces Ba2+ with Bi3+, and divalent metal Me2+ with Fe3+ to balance the overall electricity price. The crystal phase of the hexagonal soft magnetic ferrite material is Y-type hexagonal ferrite, and the molecular formula is Ba2-xBixMe2+xFe12-xO22, 0 H01F 1 / 34 C04B 35 / 26 C04B 35 / 64 1 4 1 2007 / 6 / 14 101106004 2008 / 1 / 16 000000000 University of Science and Technology Beijing Beijing 100083 Bai Yang Qiao Lijie Xu Fang luzhong qiang 11207 The Patent Agency of Beijing University of Science and Technology No.30 Xueyuan Road, Beijing 100083

The invention discloses a high-temperature glisten glaze and a preparation method thereof. The glaze comprises, by mass, 1-16% of Al2O3, 50-75% of SiO2, 0.5-5% of CaO, 0-2% of MgO, 2-9% of K2O, 0-2% of Na2O, 2-16% of ZnO, 0-2% of PbO, 3-9% of ZrO2, 3-10% of CeO2 and 0.5-8% of B2O3. The glisten glaze is wide in application range, good in firing performance and high in stability and glisten strength; and the preparation method is reasonable and simple in technology.