89results about How to "Wide sintering temperature range" patented technology

The invention discloses a preparation method for modified superfine low-oxygen water-atomized alloy powder used for a diamond tool. The alloy matrix powder for a tool bit of the diamond tool can be manufactured through the method. The preparation method has the characteristics that the alloy powder is modified by adding multiple strengthening elements and the bending strength of a sintered matrix is improved at the same time; the superfine-grained alloy powder is manufactured through an ultrahigh-pressure water atomization technology, the alloy powder sintering compaction is lowered while the composition uniformity of single powder; the low-oxygen-content alloy powder is obtained through control over a smelting technique and a reduction technique, and the compactness of the sintered matrix is improved.

The invention discloses a NiZnCu ferrite material, which is a ferrite material made by adding organic additives and inorganic oxide additives in the base raw material prescription of Fe[2] O [3], NiO, or Ni [2] O [3], CuO, ZnO. The reparing method includes: adding the raw material and the organic additives into the inorganic oxide additives, mixing with water, drying, sifting; presintering; joining the organic additives again, adding water for ball milling, mixing; drying and then sifting, to obtain the inventive NiZnCu ferrite material. Granulation, molding and sintering is required during manufacturing magnet ring. Compared with the existing technology, this invention adds organic additives twice to make the prescription and process simpler, reduce the cost and presintering temperature, improve the sintering activity of the presintering material so that the sintering temperature scope becomes wider, and obtain a NiZnCu ferrite material with a good consistency of production batches, suitability for industrial production, high magnetic permeability and Q value stability.

The invention discloses high-strength aluminum oxide ceramic metalized paste and a preparation method thereof. The metalized paste disclosed by the invention is prepared from the following substances by weight percent: 70-85% of molybdenum powder, 5-15% of manganese powder, 5-15% of Al2O3 powder; 5-10% of silica powder, 0.2-1.2% of calcium oxide, 0.2-1.5% of magnesium oxide, 0.2-1.5% of zirconium oxide powder, and 0.2-1.0% of titanium dioxide powder. The preparation method comprises the steps of respectively putting the substances into an oven according to the ratio; baking for 1-2 hours at the temperature of 100-110 DEG C; putting the molybdenum powder into a ball grinder; adding absolute ethyl alcohol to grind for 24-48 hours; baking at 100-110 DEG C; and putting the manganese powder, the Al2O3 powder, the silica powder, the calcium oxide, the magnesium oxide, the zirconium oxide powder and the titanium dioxide powder into the ball grinder to grind for 4-6 hours; adding the grinded molybdenum powder to grind for 36-48 hours, so as to obtain the mixed powder of the materials; and adding a binder to the mixed powder to grind for 24-48 hours, so as to obtain the metalized paste.

The invention relates to a composite sialon-corundum fire-resisting material, which is characterized in that the formulation of the fire-resisting material comprises the following: 30 to 54 percent of corundum or aluminum oxide hollow sphere the diameter of which is between 3 and 1 millimeter, 7 to 30 percent of the corundum or the aluminum oxide hollow sphere the diameter of which is between 1 and 0.0088 milliliter, 16 to 30 percent of corundum powder the diameter d90 of which is less than 0.088 millimeter, 3 to 10 percent of alpha aluminum oxide micro powder, 2 to 8 percent of hydrated aluminum oxide, 0.2 to 2 percent of siliceous dust, 0 to 2 percent of barium aluminate cement, 0.05 to 0.4 percent of efficient water reducing agent (which is prepared from polycarboxylic acid, sulfonated naphthaldehyde polymer and sulfonated melamine polymer), 1 to 6 percent of polyacrylic acid emulsion, and 1 to 6 percent of water. The composite sialon-corundum fire-resisting material obviously has the advantages of coagulation, hardening, demolding, drying and heating performances remarkably similar to a low cement casting material, and good high-temperature resistant performance, and can be made into various products or be used as an unshaped material.

The invention discloses a glaze-crawling-proof protection coating for an immersion type water gap slag line and a preparation method of the glaze-crawling-proof protection coating. The coating is prepared from a main material, water and dextrin; the main material is prepared from the following components in percentage by weight: 62 percent to 66 percent of tabular corundum, 15 percent to 17 percent of Suzhou clay, 3 percent to 5 percent of bentonite, 12 percent to 16 percent of active aluminum oxide and 0.5 percent to 1 percent of sodium silicate; the weight ratio of the water to the dextrin to the main material is (31 to 33):(0.6 to 0.8):100. The glaze-crawling-proof protection coating disclosed by the invention can be used for effectively preventing an anti-oxidization coating of the immersion type water gap slag line part from generating glaze crawling, so that the strength and anti-corrosion performance of the immersion type water gap slag line are improved, and the service life of an immersion type water gap can be prolonged for 2.5 hours to 3.5 hours.

A high-frequency dielectric ceramics sintered at low temp has a structure expressing formula: (Bi3xZn2-3x)(Znx-y/3Nb2-x-2y/3May)O7 and (Bi3xZn2-3x)(ZnxNb2-x-yMby)O7, where Ma=Sn or Zn, Mb=Sb, Ta, or Mo, x=0.45-0.67 and y=0-1.5. Its advantages are high dielectric coefficient (25-8), low medium loss, low sintering temp (840-1060 deg.C), high insulating resistance, and wide range of temp coefficients.

The invention discloses a novel ultra-low-loss microwave dielectric ceramic material and a preparation method thereof and belongs to the technical field of electronic information functional materials and devices. The general chemical formula of the ceramic material is Li(2+a)(Mg(1-b)Xb)3YO6.cZ, wherein X refers to Ca<2+> or Sr<2+>, Y refers to Ti<4+>, Sn<4+> or Zr<4+>, Z refers to one of MgO, ZnO and CaF2 or a combination of MgO, ZnO and CaF2, a is larger than or equal to 0.03 and smaller than or equal to 0.15, b is larger than or equal to 0.01 and smaller than or equal to 0.04, and c is larger than or equal to 0 and smaller than or equal to 0.15. Raw materials of the microwave dielectric ceramic material are prepared as per the general chemical formula, subjected to ball-milling mixing for the first time, pre-sintered at 980-1,200 DEG C, then subjected to ball-milling mixing for the second time and sintered at 1,250-1,400, and the material is prepared; the crystalline phase of a finished product is a cubic phase adopting an ordered rock salt structure. The performance of the microwave dielectric ceramic material is greatly improved, the relative dielectric constant epsilonr of the microwave dielectric ceramic material is adjustable in a range of 8-20, the quality factor Q*f value is in a range of 92,000-153,000 GHz, meanwhile, the temperature coefficient tauf of resonance frequency ranges from -23 ppm/DEG C to 5 ppm/DEG C, and the material has the stable performance and can meet the application requirements of modern microwave devices.

The invention relates to a silicon solar cell electrode silver coated copper sizing agent and a preparing method of the silicon solar cell electrode silver coated copper sizing agent. Conductive component micro silver coated copper powder is the spherical micro metal powder with copper serving as the core, silver serving as the shell, and copper-tin-silver alloy serving as the middle layer, the copper content is 50 percent to 60 percent, the silver content is 30 percent to 40 percent, the tin content is 3 percent to 10 percent, the particle size is 1-3 microns, the tap density is 4.0-5.5 g/ml, the specific surface area is 0.5-1.5 m<2>/g, and the conductive component micro silver coated copper powder is prepared under the alkaline condition with glyoxylic acid or glyoxal serving as a reducing agent to conduct step-by-step reduction on copper sulfate, tin sulfate and a silver nitrate solution. A bismuth-silicon-boron-zinc-cerium-molybdenum system is adopted in lead-free glass powder, the softening temperature of the glass powder is 400-600 DEG C, the micro silver coated copper powder serves as the conductive component, a large amount of silver powder is saved, and the raw material cost of the conductive sizing agent is greatly reduced.

The present invention relates to a magnesium-aluminum refractory material. The magnesium-aluminum refractory material is prepared by using magnesium aluminate spinel of different particle sizes as a raw material, and adding an auxiliary additive, nanometer magnesia, boron carbide, a binder and nanometer aluminium oxide. According to the product provided by the present invention, the organization structure is more uniform, and therefore strength and thermal shock resistance of the product are improved; the particle size of nano-zinc oxide is small, and therefore micro pores can be filled with the nano-zinc oxide, porosity of the product is reduced, and volume density is increased; and refractoriness is high, corrosion resistance is excellent, thermal shock resistance is good, and the sintering temperature range is wide.

The invention relates to large or specific compound magnesium-aluminum spinel products with the formula of 48 to 56 percent of 5-1mm magnesium-aluminum spinel, 12 to 22 percent of 1-0.088mm magnesium-aluminum spinel, 16 to 25 percent of magnesium-aluminum spinel with d90 less than 0.088mm, 3 to 6 percent of magnesium-aluminum spinel with d90 less than 0.010mm, 3 to 15 percent of beta alumina powder with d95 less than 0.020mm, 2 to 6 percent of hydratable alumina, 1 to 5 percent of magnesium promoter, 0.05 to 0.4 percent of external efficient water reducing agents (polycarboxylic acid plus sulfonation naphthaldehyde polymer plus sulfonation melamine polymer), 1 to 6 percent of latex of the system of external polyacrylic acid and 1 to 6 percent of external water. The magnesium-aluminum spinel composite combined refractory has the following chemical compositions: 72 to 87 percent of Al2O3, 12 to 27 percent of MgO, 0.2 to 1.5 percent of Na2O and 0.1 to 0.5 percent of SiO2. The raw materials are weighed according to the ratios, and are mixed, molded and maintained to make billets, and then are subjected to the processes of drying, firing at the temperature of 1430 to 1650 DEG C and inspection and the like so as to make products of large or specific compound magnesium-aluminum spinel refractory. The magnesium-aluminum spinel product has excellent manufacturing performance and excellent performances of high-temperature resistance, erosion resistance and creep resistance. As the products are casted and moulded, large and specific products can be produced.

The invention provides lead-free glass powder for electronic paste of a solar battery, and a preparation method for the lead-free glass powder. The lead-free glass powder comprises the following components in percentage by mass: 30 to 60 percent of B2O3, 2.5 to 20 percent of SiO2, 30 to 55 percent of Bi2O3, 0.1 to 5 percent of Na2O, 0.1 to 3 percent of ZnO, 1.5 to 10 percent of TiO2, 0.5 to 8 percent of ZrO2, and 0.5 to 5 percent of Al2O3. The method comprises the following steps of: preparing materials, performing ball-milling to obtain powder of which the granularity is less than 300 meshes, uniformly mixing, and raising temperature and preserving heat for multiple times to ensure that the raw materials are fully fused to form glass metal; pouring into deionized water and performing water quenching, and rapidly cooling the glass metal in water and cracking into small glass particles; and performing ball-milling on the small glass particles, stearic acid and an ethanol solution used as a ball-milling medium, and drying and screening to obtain the lead-free glass powder for the electronic paste. The lead-free glass powder is low in softening temperature, high in chemical stability, appropriate in expansion coefficient, high in acid and alkaline resistance and wear resistance, wide in sintering temperature range, low in manufacturing cost, and suitable for inorganic binding phase in the electronic paste of the solar battery, and does not contain toxic heavy metal oxide.

The invention provides a rock salt type reconstructed super-lattice structure microwave dielectric ceramic material and a preparation method thereof. The general chemical formula of the material is Li3+x(1-yAy)2-2xNb1-xTi2xO6Mg, and A is one or more of divalent ions: Cu2+, Zn2+, Ni2+ and Co2+, 0.08<=x<=0.3 or 0.8<=x<=0.92 and 0<y<=0.05; the preparation method comprises the following steps: burdening, ball milling, drying and sieving, pre-sintering, granulating, compression molding and sintering. The prepared material has a typical rock salt type reconstruction short-range ordered super-latticestructure, is highly compact in micro-structure, free of pores and micro-cracks and high in quality factor, Q*f ranges from 9,000 GHz to 13,000 GHz, the relative dielectric constant [epsilon]r rangesfrom 16 to 21, and the frequency temperature coefficient [tau]f ranges from -30 ppm/DEG C to +3 ppm/DEG C. The formula does not contain volatile toxic metals such as Pb, Cd and the like, and the material is stable in performance, and can meet the application requirements of modern microwave devices.

The invention discloses an LTCC low-frequency dielectric ceramic capacitor material and a preparation method thereof. The material uses BaTiO3 as a main material with the addition of 0.5% to 6.8% of a sintering aid and 1% to 11% of a metal oxide in weight percentages on the basis of the BaTiO3. The sintering aid is prepared from the following raw materials in percentages by weight: 0.3% to 32% of Bi2O3, 1% to 28% of K2CO3, 1% to 22% of TiO2, 3% to 38% of LiF and 2% to 31% of SiO2; the metal oxide is prepared from the following raw materials in percentages by weight: 0.2% to 32% of Nb2O5, 0.5% to 28% of Co3O4, 0.9% to 22% of WO3, 0.4% to 37% of MnCO3, 0.6% to 33% of Re2O3 and 1.1% to 10% of CuO. The sintering temperature is high (800 DEG C to 900 DEG C) and accords with and exceeds the EIA X9R standard, the material has the advantages of being low in dielectric loss, high in dielectric constant, high in reliability, high in uniformity and environment-friendly, the working temperature range is between -55 DEG C and +230 DEG C, and the material adapts severe environment requirements.

The invention provides flux for high acid resistance automotive glass printing ink and a preparation method thereof. The base material of the flux comprises the following raw materials in parts by mass: 1 to 4 parts of lithium oxide, 0 to 3.5 parts of sodium oxide, 0 to 2 parts of potassium oxide, 1 to 4 parts of calcium oxide, 0.5 to 3 parts of magnesium oxide, 2 to 7 parts of boron oxide, 0.5 to3 parts of phosphorus pentoxide, 20 to 30 parts of silicon oxide, 1 to 5 parts of titanium oxide, 1 to 5 parts of zirconium oxide, 55 to 65 parts of lead oxide, and 2 to 5 parts of an applied acid proofing agent. The flux has a wide softening temperature range and a wide swelling coefficient range within a formula component, the range of the ratio of the flux to a toner is wide, and the formed printing ink can be fired into light and matt effects in different degrees. The glass printing ink prepared through the flux has a high hiding rate, a wide sintering temperature range and high adhesiveforce and weather resistance, and meanwhile has high acid resistance.

The invention relates to a chip-type intelligent pyroelectric infrared sensor, which is a closed structure shell composed of a tube cap and a substrate. The upper surface of the tube cap has a window, and an infrared optical filter is embedded on the window; and the tube cap and the A receiving space is formed between the substrates, and the receiving space accommodates and encapsulates the infrared sensitive element, the supporting component and the signal processing module; the infrared sensitive element is fixed by the supporting component, and the supporting component and the signal processing module are directly fixed on the substrate. The pyroelectric infrared sensor of the present invention has the characteristics of miniaturization, intelligence, and the ability to output multiple control signals. This packaging structure is suitable for SMT automatic patch and reflow soldering processes, which is conducive to mass automatic production and improves manufacturing efficiency. Reduce manufacturing costs.

The invention discloses a fully-closed high temperature microwave sintering roller kiln, which aims to overcome the shortcomings of high noise, relatively poorer tightness and proneness to the occurrence of kiln arching of the conventional sintering kiln which is a gear drive mechanism. The fully-closed high temperature microwave sintering roller kiln comprises a closed kiln body consisting of a top plate, side plates and a bottom plate. Multi-layer fiberboards are arranged on the two sides and top part of the kiln body. A roller bed is arranged on the bottom plate of the kiln body, and is provided with a push plate for conveying materials. The push plate is driven by a roller bed drive system arranged in a cavity of the kiln body. The fully-closed high temperature microwave sintering roller kiln has a simple structure, low manufacturing cost, high tightness, high product sintering efficiency, high sintering quality and a wide sintering temperature range, is energy-saving, environmentally-friendly, safe and reliable and avoids the phenomenon of kiln arching.

The invention relates to a high-performance silicon carbide ceramic material and a preparation method thereof. The preparation method comprises the following steps of raw material preparation, ball-milling mixing, spray granulation, compression molding and sintering. Through the adding proportion of alpha-silicon carbide powder and beta-silicon carbide powder in the raw materials, grain boundary strengthening and grain refinement are facilitated, and further, the obdurability and the hardness of the silicon carbide ceramic are improved. The sintering temperature range can be expanded by proper sintering aid composition, and convenience is brought to process control; the sintering aid is B4C, C and AlN, and when the mass ratio of B4C to C to AlN is (1-2): (1.5-3): (1-3), the sintering aid can better improve the interface bonding strength between silicon carbide grains and promote the improvement of high-temperature strength. When the sintering temperature is 2050 DEG C, the sintering density of the silicon carbide ceramic material is high. The prepared silicon carbide ceramic material has excellent room-temperature and high-temperature mechanical properties.

The invention provides an ultralow-loss yttrium aluminum garnet microwave dielectric ceramic material, the chemical general formula of the material is Y3-xAl5-yRzO12, and R is one or more selected from Mg < 2 + >, Ga < 3 + >, Si < 4 + >, Ti < 4 + > and Nb < 5 + > heterovalent ions; 0 < = x < = 0.15, 0 < = y < = 0.8 and 0.03 < = z < = 1.5; the invention also provides a preparation method of the ultralow-loss yttrium aluminum garnet microwave dielectric ceramic material. The preparation method comprises the following steps: burdening, ball milling, drying and sieving, presintering, dry pressing,isostatic cool pressing, vacuum sintering and atmosphere control annealing. The prepared material is typical ultralow-loss garnet type aluminum-based microwave dielectric ceramic, Q * f ranges from 180000 GHz to 220000 GHz, the relative dielectric constant epsilonr ranges from 8 to 12, and the frequency temperature coefficient tauf ranges from -33 ppm/DEG C to -22 ppm/DEG C. The formula does notcontain volatile toxic metals such as Pb, Cd and the like, the performance is stable, and the raw materials are sufficiently supplied in China, so that the low cost of the high-performance microwave ceramic becomes possible.

The invention relates to a frequency-stable low-dielectric microwave dielectric ceramic material and a preparation method thereof. The material is prepared from the following components in percentage by mass: 70-90% of a main-phase ceramic material A, 10-30% of an auxiliary-phase ceramic material B and 0-1.0% of an oxide sintering aid C, The main-phase ceramic material A is MgxMeySiO2+x+y; the auxiliary-phase ceramic material B is composed of aRO-bRe2O3-cTiO2, R is at least one of Ca or Sr, Re2O3 is at least two of Sm2O3, Nd2O3, Y2O3, Al2O3 and La2O3; and the oxide sintering aid C is at least one of MnO2, WO3 and CeO2. The dielectric constant of the prepared microwave dielectric ceramic material is 9.5-13.6, the frequency temperature coefficient tau f is continuously adjustable between -16 ppm/DEG C and 13 ppm/DEG C, and the ceramic material has good frequency stability and is suitable for the fields of new-generation mobile communication, high-frequency network communication and the like.

Relating to the technical field of glass, the invention discloses an inking process of automobile glass. The method includes the steps of: 1) preparation of varnish; 2) preparation of low-melting-point glass powder; 3) preparation of glass ink; 4) pretreatment of an automobile glass substrate: wiping the automobile glass substrate with acetone and then performing drying; 5) primary sintering: printing glass ink on the plane at the peripheral edge of the pretreated automobile glass substrate in a silk-screen printing mode to form an ink layer, and performing primary sintering; and 6) secondarysintering: spraying nitrogen with silicon carbide composite particles to the surface of the ink layer, performing secondary sintering, then taking out the product, and conducting cooling. The siliconcarbide layer with corrosion resistance is prepared on the surface of the automobile glass ink layer to increase the roughness of the automobile glass ink surface, thus endowing the surface of the automobile glass ink layer with super-hydrophobicity, preventing acid rainwater from contacting the surface of the ink layer, and prolonging the service life of the glass ink layer.