4 results about "Dry pressing" patented technology

The invention relates to a preparation method of a far infrared antibacterial ceramic in the field of building materials. The method includes: compounding vanadium-titanium waste residue, bastnaesite, monezite, xenotime, Minjiang clay, quartzite, calcite, sepiolite, kaolinite and limestone according to a formula, adding a mud cosolvent and performing wet ball milling treatment, carrying out spray granulation, dry pressing, demoulding and drying, and then conducting firing so as to obtain the far infrared antibacterial ceramic product. The formula comprises, by mass percentage: 20-50% of vanadium-titanium waste residue, 3-5% of bastnaesite, 2-4% of monezite, 2-6% of xenotime, 10-30% of Minjiang clay, 15-45% of quartzite, 5-15% of calcite, 2-6% of sepiolite, 2-10% of kaolinite, and 4-8% of limestone. The far infrared antibacterial ceramic prepared by the method provided by the invention has the advantages of high infrared emissivity, good sterilizing effect, high ceramic strength and low cost.

The invention relates to a pore forming device. The device comprises a pile casing, the pile casing is provided with a hydraulic cylinder bracket on the upper port of the pile casing, and a hydrauliccylinder is installed on the hydraulic cylinder bracket, and the piston rod of the hydraulic cylinder points to the lower port of the pile casing, on the end of the piston rod is provided with a bearing, at least one swing rod is articulated on the outer ring of the bearing, and the other end of the swing rod is hinged on one side of a guide block, wherein the bottom of the guide block is providedwith a pressure bar, which is arranged in the vertical direction, and a pressure soil plate is installed at the bottom of the pressure bar, which is arranged vertically with the pressure bar, a guidegroove is arranged on the inner wall of the pile casing, the guide groove is wavy and guides the guide block to slide on the inner wall of the pile casing, so that the pressure soil plate is moved inthe circumference direction of a protecting bush in order to realize pore forming by soil compaction. The pore forming device has the advantages that the dry pressing hole is adopted, no mud is produced in the process of pressing hole, and there is no transportation problem, and the required equipment is less, and the cost of the enterprise is reduced.

The invention belongs to the technical field of permanent magnetic ferrite, and discloses an anisotropic permanent magnetic ferrite and a preparation method thereof. The preparation method comprises the following steps: (1) adding polyvinyl alcohol water to obtain a polyvinyl alcohol dilute solution, wherein the ratio of polyvinyl alcohol in the polyvinyl alcohol dilute solution is 0.1-2 wt%; (2)adding ferrite magnetic powder into the polyvinyl alcohol dilute solution, stirring and mixing to obtain slurry, wherein the mass ratio of the ferrite magnetic powder to the polyvinyl alcohol dilute solution in the slurry is 3: (1.2-3); (3) drying the slurry at a low temperature of 70-80 DEG C, crushing after drying, adding a lubricant, stirring and dispersing to obtain anisotropic permanent magnetic ferrite powder; and (4) placing the anisotropic permanent magnetic ferrite powder in a magnetic field, and carrying out dry pressing molding, sintering and grinding to obtain the anisotropic permanent magnetic ferrite. The anisotropic permanent magnetic ferrite product prepared by the preparation method is excellent in molding effect and magnetic comprehensive performance.

The invention discloses a preparation method of strontium titanate (SrTiO3) ceramic with high dielectric constant and low dielectric loss. The main technical scheme is characterized by firstly takingSrCO3, TiO2 and Nb2O5 as raw materials, taking the materials according to a ratio of chemical formula expressed as SrTi(1-1.25)xNbxO3, carrying out wet ball milling, mixing and drying to obtain driedpowder, putting the dried powder in an electric furnace, calcining the dried powder for appropriate time under certain temperature and then taking the dried powder out, carrying out wet ball milling,drying and sieving to obtain fine strontium titanate ceramic powder; molding the powder by dry pressing, putting the powder in a high-temperature electric furnace, and sintering for 2 hours at the temperature of 1420-1480 DEG C to obtain the required strontium titanate ceramic. The prepared strontium titanate ceramic has excellent dielectric properties; the dielectric constant of the strontium titanate ceramic can be maintained at 296-303 and is equivalent to that of the ordinary strontium titanate ceramic; the maximum Q*f value is close to 7000GHz and is far higher than that of the ordinary strontium titanate ceramic. The method is simple in process, can easily achieve large-scale production, and has an extremely high practical value.