42results about How to "Achieve sintering" patented technology

The invention relates to oxide-dispersion-strengthening ferrite / martensitic steel with the excellent high-temperature strength and the good oxidation resistance and a preparing method of the oxide-dispersion-strengthening ferrite / martensitic steel. The oxide-dispersion-strengthening ferrite / martensitic steel comprises 8% to 10% of Cr, 0.5% to 2% of W, 1.5% to 5.5% of Al, 0.1% to 0.4% of V, 0.1% to 0.5% of Mn, 0% to 1.0% of Zr, 0% to 1.0% of Hf and 0.25% to 0.5% of Y2O3. The content of C and the content of N are controlled to be lower than 0.1%, and at least one kind of the Hf and the Zr is contained; the oxygen content of atomized powder is controlled to be lower than 0.05 wt.%, the atomized powder with the particle size ranging from 50 meshes to 200 meshes is selected to be mechanically alloyed with Al powder, Zr powder, Hf powder and Y2O3 powder, and the size of obtained powder ranges from 90 micrometers to 200 micrometers; silicate glass is used for wrapping, compressing and molding, the pressure is started to be boosted to 120 MPa to 180 MPa at the temperature of 850 DEG C, a two-stage sintering manner in which the temperature ranging from 850 DEG C to 950 DEG C is kept for 1 hour and the temperature ranging from 1050 DEG C to 1150 DEG C is kept for 1 hour is adopted, the tensile strength of the finally-obtained ferrite / martensitic steel at the temperature of 700 DEG C ranges from 250 MPa to 320 MPa, and the ductility of the finally-obtained ferrite / martensitic steel at the temperature of 700 DEG C ranges from 18% to 32%; and the oxidation performance of the dispersion-strengthening steel is also greatly improved on the premise that the high-temperature strength and the high-temperature plasticity are guaranteed, and after 100-h oxidation is carried out at the temperature of 850 DEG C, the oxidation weight increase only ranges from 0.0327 mg / cm<3> to 0.098 mg / cm<3>.

The invention discloses a preparation method of a high-strength silicon carbide porous ceramic. Raw materials are composed of 98%-99% of mixture of alpha-silicon carbide powder and beta-silicon carbide powder, 0.1%-1.0% of aluminum diboride and 0.5%-1% of polycarbosilane, by weight percent. The method comprises the following steps: 1) adding the raw materials into an organic dispersing solvent, ball-milling, mixing and drying; 2) dry-pressing and forming the obtained silicon carbide compound powder under the 45-55 MPa; and 3) placing a silicon carbide blank into a vacuum pressure-less sintering furnace, for sintering at two steps, thereby obtaining the high-strength silicon carbide porous ceramic. The preparation method is simple and the prepared silicon carbide porous ceramic is characterized by high mechanical strength, suitable porosity, and the like.

The invention relates to a soft magnetic composite powder and its application. The preparation method of the soft magnetic composite powder is as follows: according to the ferrite soft magnetic chemical formula; prepare the water-soluble metal salt corresponding to the metal element in the ferrite, and make solution A; make the precipitant into solution B; Add magnetic metal powder into water to obtain suspension C; add solution A and B to C and co-precipitate at the same time to obtain coated powder; then perform low-temperature calcination under oxygen-containing atmosphere and high-temperature calcination under inert atmosphere in sequence; obtain composite powder . The specific scheme of the application is: add coupling agent, silicone resin and lubricant to the composite powder; select powder with appropriate particle size after drying; High-temperature annealing under atmosphere to obtain soft magnetic composite materials. The composite powder prepared by the invention has higher magnetic properties and resistivity, and the soft magnetic composite material has better magnetic properties, frequency stability and wider use frequency.

The invention discloses a novel rotary kiln which comprises a kiln body and a kiln car. The kiln body is of an annular structure integrally, the kiln car is provided with a drying section, a preheating section, a high-temperature calcining section and a cooling section, the kiln body integrally falls into the ground to form a trench-type structure, an air suction passage is formed on two side faces or at the bottom of the cooling section of the kiln body, a passage is formed below the bottom of the kiln body to form a main flue, an air feeding flue is formed on two side faces or at the bottom of each of the cooling section and the drying section, and the main flue is communicated with the air suction flue and the air feeding flues. Waste heat of finished brick products and hot air are extracted from the side faces of the cooling section of the trench-type rotary kiln to enter the main flue at the bottom, and are divided to enter the air feeding passages after reaching the drying section, and the air feeding flues feed hot air from the side face of the kiln body into the drying section in the kiln body to dry wet blank bricks.

The invention relates to the field of vanadium-titanium-magnetite concentrate preparation, in particular to a sintering method for vanadium-titanium-magnetite concentrate which can effectively improve the quality of sintered ore products. Fluorite ore powder, 65-75 parts of vanadium-titanium magnetite concentrate, 3-8 parts of limestone powder, 6-10 parts of active lime and 4.5-5 parts of coke powder are mixed to form a mixture, and the mixing is controlled The alkalinity of the material is 1.8 to 2.4; water is added to the mixture, and the weight percentage of water in the mixture after adding water is controlled to be 7.2% to 7.6%; the first mixing granulation and the second mixing The material after the second mixing and granulation is added to the sintering machine for sintering, and finally the finished product is obtained. The invention controls the proportion of each material, realizes the sintering of vanadium-titanium magnetite concentrate, increases the binding phase of the sintered ore, increases the liquid phase generation amount in the sintering process, and improves the strength of the vanadium-titanium sintered ore. The invention is especially suitable for the sintering process of vanadium titanomagnetite concentrate.