42results about How to "Sinter stable" patented technology

An apparatus for making a three-dimensional object includes a powdery layer-forming unit for forming a powdery layer on a table and an optical beam-irradiating unit for irradiating an optical beam on a predetermined region of the powdery layer to sinter the predetermined region. The optical beam-irradiating unit is disposed at a position spaced from immediately above an optical beam-irradiating range to obliquely irradiate the optical beam on the powdery layer. Because fumes generated by irradiating and heating the powdery layer with the optical beam rise towards a position immediately above them, the optical beam is irradiated from the position spaced from immediately above the optical beam-irradiating range, thereby reducing a cloud of the optical beam-irradiating unit that may be caused by the fumes.

An aluminum nitride sintered body with high heat conductivity and high strength as well as a method of inexpensively manufacturing such an aluminum nitride sintered body at a low temperature are provided. The aluminum nitride sintered body is manufactured by adding a compound of at least one type of rare earth element (R) selected from La, Ce, Pr, Sm; and Eu, Y compound, Ca compound, and Al compound to an AlN powder and sintering the resulting mixture at a temperature of 1550° C. to 1750° C. The content of oxygen forming Al2O3 existing in an aluminate with rare earth element (R), Y and Ca and oxygen forming independently existing Al2O3 is calculated as 0.01 to 5.0% by weight, heat conductivity is 166 to 200 W/mK, and bending strength is at least 300 MPa.

The invention provides a numerical control multifunctional horizontal wrapping machine which comprises a constant tension line laying rack. The machine also comprises a straightening wheel, a four-side polishing device, a warm water washing cleaning device and a hot air blow-dry device which are installed on a first bench in order. The machine also comprises an insulation film eccentric or concentric wrapping device, a high frequency sintering and high frequency sintering head cooling device, an auxiliary oven and a water cooling and on-line high voltage detection device which are installed on a second bench in order. The machine also comprises a air pressure adjusting crawler type main draw gear, a first insulation ribbon eccentric wrapping device or concentric wrapping device, a second coating device, a second insulation ribbon eccentric wrapping device or concentric wrapping device, a third coating device, a draw gear, a drying device, and a wire arrangement collection device. The cleaning device is provided with a water heating device and a booster pump. An antioxidation device is provided between the hot air blow-dry device and the insulation film eccentric or concentric wrapping device. A constant tension device controlling film or filament disc material emptying on the wrapping head is a numerical control constant tension device. By using the numerical control multifunctional horizontal wrapping machine in the invention to wrap insulated wire, product quality and production efficiency of the insulated wire is raised.

The invention provides a microwave dielectric ceramic material prepared by a composite oxide and an additive. The composite oxide is represented by the following general formula: MLa4Ti3M'O15, whereinM is Ca, Ba or Mg, and M' is Al, Sb or Bi. Compared with the prior art, the microwave dielectric ceramic material provided by the invention is prepared by the compound oxide represented by a specificgeneral formula and the additive and is a medium-dielectric-constant microwave dielectric ceramic; the microwave dielectric ceramic material satisfies the dielectric constant near 45 and is continuously adjustable, has an extremely high Q*f value and good sintering stability, and also can achieve continuous adjustment of temperature drift to meet various needs. Experimental results show that therelative dielectric constant [epsilon]r of the microwave dielectric ceramic material provided by the invention is 43.2-46.8, the quality factor Q*f value is more than or equal to 46200 GHz, and the sintering is stable; at the same time, the temperature drift adjusting range is from -8 to +13 ppm/DEG C and can be continuously adjustable to meet various needs, and the microwave dielectric ceramic material has excellent application value and market potential.

The invention relates to a high-quality dolomite-periclase-calcium zirconate composite fireproof material suitable for smelting stainless steel, special steel AOD furnace and refining ladles. The adopted raw materials mainly comprise, by weight, 8-10% of magnesium calcium sand with a particle size of 5-8 mm, 9-18% of magnesium calcium sand with a particle size of 3-5 mm, 10-22% of magnesium calcium sand with a particle size of 1-3 mm, 5-10% of calcium zirconate with a particle size of 0.5-1 mm, 5-10% of magnesia with a particle size of 0.5-1 mm, 3-10% of 600 mesh electric melting calcium zirconate, 15-24% of magnesia with a particle size of less than or equal to 0.5 mm, 3-10% of 400 mesh 98 large crystal magnesia, 1-3% of a binding agent, and 1-2% of a sintering agent, wherein the raw materials are subjected to mixing, molding, sintering, finished product inspection, package and other steps to prepare the material.

The invention discloses a diamond saw blade and a preparation method. The diamond saw blade includes a disc matrix. A plurality of cutting units are evenly arranged along the outer circumference of the matrix. The center of the matrix is provided with an axle hole. The cutting units are in the same shape, and each cutting unit includes at least two diamond cutter heads. The cross section of each diamond cutter head is U-shaped, and each diamond cutter head is mounted at the edge of the matrix in a crossing mode. The outermost side of each diamond cutter head is distributed in a circle and theinnermost side of each diamond cutter head overlaps with the upper and lower surfaces of the matrix. Through structure improvement, the stiffness of the matrix and the service life of the saw blade are improved, further, the interface bonding between diamond particles and a metal blank body is improved, thus the utilization rate of the diamond particle in the diamond saw blade is increased, so thecutting efficiency and service life are increased, and finally the high-efficiency and low-cost diamond saw blade is obtained.

The invention provides a frequency conversion energy-saving control method for the main exhaust fan of a sintering machine, which includes the following steps: S1: according to the collected temperature, fit the function relationship curve between the temperature of the bellows and the position of the bellows; S2: get the function curve according to the function curve Sintering end point BTP and temperature rise point BRP calculated at time; S3: S3: Determine whether the change of the temperature rise point BRP exceeds the stable range, if not, go to step S4; S4: Calculate according to the sintering end point BTP obtained in step S2 Determine the current vertical sintering speed; calculate and determine the ideal vertical sintering speed with the second-to-last or third-to-last bellows as the sintering end point; S4: Compare the current vertical sintering speed with the ideal vertical sintering speed to determine whether adjustment is required, If adjustment is required, calculate and determine the adjustment value of the corresponding vertical sintering speed; S5: Determine the adjustment value of the speed of the main exhaust fan according to the adjustment value of the vertical sintering speed determined in step S4, and then adjust the speed of the main exhaust fan.

The invention relates to the technical field of ceramic materials, in particular to a zirconium oxide ceramic material and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps of mixing zirconium oxide, an oxide stabilizer, an organic dispersant, a polymer stabilizer and water, and homogenizing to obtain a homogeneous mixed solution, pre-sintering the homogeneous mixed solution to obtain a pre-sintered green body, and finally sintering the pre-sintered green body to obtain the zirconium oxide ceramic material, wherein the pre-sintering temperature ranges from 600 DEG C to 1000 DEG C; and the temperature of the final sintering is 1200 to 1400 DEG C. The zirconium oxide ceramic material prepared by the preparation method has high volume percentage content of tetragonal phase zirconium oxide and stably exists in the presence of water vapor; and the tetragonal zirconium oxide is small in grain size and high in bending strength.

The invention discloses a method for preparing a multilayer electronic device and a multilayer electronic device. The preparation method comprises the steps of: preparing a ceramic substrate; formingan electrode thin layer on the ceramic substrate, wherein the electrode thin layer is made of metallic oxide, and one ceramic substrate and one electrode thin layer on the ceramic substrate form one device unit; putting a plurality of device units to a preformed unit in a stack mode, and applying pressing force to the preformed unit to laminate and fix the device units; and performing the sintering process to the preformed unit to prepare the multilayer electronic device. The problem is solved that the electrode thin layer is easily volatilized during processing.

The invention discloses an ore blending method for blending ferrodolomite into low-magnetism crude iron ore. The method specifically comprises the following steps: acquiring data of an iron ore resource to be mined as a plan; setting the level and calcium oxide content target of iron output from the iron ore; building ore blending models of iron ore and ferrodolomite; and outputting the ore blending quantity of ferrodolomite. The method has the advantages that ferrodolomite is reasonably blended into the low-magnetism crude iron core according to the ore-dressing study and the practice result; the reasonable ore blending quantity and the output ore quality are calculated; the ferrodolomite in an own mine can be recovered. Therefore, the resource utilization level can be improved; the production cost of ore mining, ore dressing and sintering can be synchronously decreased; the reasonable ferrodolomite blending quantity and the output ore quality can be calculated, so that the resource utilization efficiency can be improved, and the ore mining cost can be decreased; the service life of a mine can be prolonged, and the waste stone output can be reduced; the ore dressing and sintering processes are stable; the ore dressing ratio can be reduced during ore dressing, and the lime consumption in sintering can be decreased, thus reducing the cost of ore dressing and sintering systems.

The invention provides a BaTiO3-based fine-grain ceramic with a giant dielectric constant, low loss and high resistivity. The BaTiO3-based fine-grain ceramic is prepared from the following raw materials in parts by mole and MAS: 100 parts of BaTiO3; 0.2 to 2 parts of Ln2O3; 0.2 to 2 parts of MnO2; 0.05 to 2 parts of MgO; the Ln2O3 is one or more of Y2O3, H2O3, Dy2O3 and Sm2O3, and the Ln2O3 is one or more of Y2O3, H2O3, Dy2O3 and Sm2O3; the content of the MAS accounts for 0.5 wt%-3 wt% of the BaTiO3. Compared with the prior art, the BaTiO3-based fine-grain ceramic with the giant dielectric constant, the low loss and the high resistivity provided by the invention adopts components with specific contents, so that relatively good overall interaction is realized, and the obtained product overcomes the problems of relatively low dielectric constant, overlarge crystal grains, low resistivity and the like of most dielectric ceramic materials; the method has great potential in application to the field of MLCC; the ceramic prepared by the invention shows excellent performance: relative dielectric constant gt; 104, the dielectric loss is 0.01-0.05, and the resistivity is gt; 109 omega.cm, the crystal grains are fine (the grain size is 1t; the material belongs to an environment-friendly electronic material, and can meet the practical application requirements of a miniaturized and light multilayer ceramic capacitor (MLCC).

The invention discloses a hot-pressing mold for small-sized carving saw blades. The hot-pressing die comprises the carving saw blades, a mold frame assembly and a hot-pressing mold assembly used in cooperation with the mold frame assembly; and the hot-pressing mold assembly comprises a baffle plate assembly, separation plate assemblies and center rods, wherein the baffle plate assembly is made ofa high-strength graphite material, and the separation plate assemblies and the center rods are used in cooperation with the baffle plate assembly. According to the hot-pressing mold, the mold frame assembly with the carving saw blades and made of the high-strength graphite material, the hot-pressing mold assemblies and the center rods are assembled together, and are put into a vacuum hot-pressingsintering machine to be subjected hot-pressing sintering so that high-pressure sintering of the stone carving saw blades can be realized, and therefore single sintering time is shortened, the production speed is increased, and the product quality is improved.

The invention discloses a composite diamond tool bit, a manufacturing method of the composite diamond tool bit, a diamond saw blade and a manufacturing method of the diamond saw blade. The diamond sawblade comprises a disc-shape base, wherein a shaft hole is formed in the center of the base; a plurality of composite diamond tool bits are uniformly arranged along the periphery of the base; chip removal grooves are formed between the composite diamond tool bits; each composite diamond tool bit comprises a metal matrix and a plurality of diamond particles; the outside of each diamond particle iscoated with a tungsten layer; the outside of each tungsten layer is coated with a nickel layer; and each diamond particle coated with the nickel layer at the outermost layer is inlayed in the metal matrix. The tungsten layers and the nickel layers improve the interface bonding between the diamond particles and the metal matrixes so as to increase the utilization rate of the diamond particles in the diamond saw blade, therefore, the cutting efficiency of the diamond saw blade is improved, the service life of the diamond saw blade is prolonged, and it is ensured that the diamond particles are sintered firmly in the metal matrixes and are not prone to falling off.

The invention discloses a petrochemical wastewater treatment method. The petrochemical wastewater treatment method comprises the following steps: 1) discharging sewage into a treatment tank and adjusting the pH (Potential of Hydrogen) value in the treatment tank to 5.5-6.0; 2) adding copper sulfate and a catalyst and adjusting the pH value to 3.6-6.0 again, wherein in each 5L of the sewage, 0.5g of the copper sulfate is added; 3) adding an oxidant into the treatment tank and controlling the electric potential of an oxidation-reduction reaction to be 200mV-220mV; 4) stirring for 1h to enable the sewage to be in sufficient contact with the oxidant and a catalyst and reacting to obtain a mixed solution A; 5) adjusting the pH value of the mixed solution A to 8.0 to 9.0 and adding polyacrylamide; sufficiently mixing to obtain a mixed solution B, wherein in each 5L of the sewage, 1mg-2mg of the polyacrylamide is added; 6) stirring the mixed solution B at a constant speed for 5min and sufficiently coagulating and reacting; and after standing and precipitating, taking supernatant as treated effluent. The petrochemical wastewater treatment method disclosed by the invention has the advantages of good catalysis effect, high purification effect, low production cost and wide applicable range.

This invention relates to a silver sintering composition. In particular, the present invention relates to a silver sintering composition containing a copper alloy, which is capable of being stably sintered on various metal substrates such as copper, gold or silver with good adhesion and sintering strength.

The invention discloses a sewage treatment method, comprising the steps of 1, the sewage, catalyst, and a first oxidizing agent being mixed and treated, the treating temperature being 50-80 DEG C, the treating time being 1-3 hours; 2, the first round treated sewage being solid-liquid separated, and the PH value being adjusted to 8-10; 3, the separated liquid under a pressure of 0.2-1.6 MPa, being heated to 110-150 DEG C, adding a second oxidizing agent, the reacting time being 1-5 hours: 4, the second round treated sewage being solid-liquid separated; the catalyst has excellent water hydrophilicity and dispersion ratio, increases catalyst effect, the treated sewage achieves industrial discharge standard, the sewage treatment result is good.