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928results about How to "Low oxygen" patented technology

Method and equipment of sealed chamber atmosphere deoxygenization and circulating purification for metal 3D printer

The invention discloses a method and equipment of sealed chamber atmosphere deoxygenization and circulating purification for a metal 3D printer. A gas inlet and a gas outlet are respectively formed in two ends of a forming chamber; the gas inlet and the gas outlet are mutually connected through a gas circulating pipeline; a first pneumatic butterfly valve, a dust purifier, a second pneumatic butterfly valve and a water removal drier are arranged on the gas circulating pipeline; a branch pipeline is arranged on the gas circulating pipeline between the second pneumatic butterfly valve and the water removal drier; the tail end of the branch pipeline is connected with a vacuum pump; a molecular sieve and a vacuum pipeline solenoid valve are arranged on the branch pipeline; the forming chamber is connected with an inert gas source. According to the method, firstly the oxygen content in the forming chamber is reduced to a required range before machining, and gas circulating purification is started during machining, so that gas purity degree in the forming chamber is kept; pressure detection and oxygen content detection are introduced, so that the oxygen content and pressure are within a reasonable range at all time during machining. The method and the equipment improve the forming efficiency and quality of the 3D printer, and guarantee the safety and the reliability of the machining process.
Owner:SOUTH CHINA UNIV OF TECH

Oxide-dispersion-strengthening ferrite/martensitic steel and preparing method

ActiveCN105039857AUniform solid solutionAvoid phase changeAl powderGranularity
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>.
Owner:UNIV OF SCI & TECH BEIJING

Preparation method of copper-coated tungsten composite powder

The invention discloses a preparation method of copper-coated tungsten composite powder, belonging to the technical field of powder metallurgy. Corresponding tungsten powder and blue vitriod are employed according to the weight ratio of composite powder to be prepared and the tungsten powder is pre-treated; copper sulphate and seignette sol are dissolved into solution; bipyridine is added and NaOH is used to adjust pH value to 12-14; an appropriate amount of formaldehyde solution and the tungsten powder are added; the mixture is heated and then stirred continuously in constant-temperature bathing at 30-60 DEG C until the tungsten powder is red; the tungsten powder is washed, dried, reduced and annealed, thereby obtaining copper-coated tungsten composite powder. The preparation method of copper-coated tungsten composite powder has wide application range and is applicable to tungsten-powder coating coppers with different finenesses and shapes. The preparation method of copper-coated tungsten composite powder prepares copper-coated tungsten composite powder in different content ratios according to different requirements. The copper-coated tungsten composite powder obtained by the method of the invention has excellent sintering activity, thereby improving the combination property of tungsten copper alloy.
Owner:UNIV OF SCI & TECH BEIJING
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