Method and device for preparation of zirconia based fixed diameter water nozzle from cerium oxide micro powder
A technology of cerium oxide micro-powder and sizing nozzle is applied in the field of preparing zirconia sizing nozzle by cerium oxide micro-powder, which can solve the problems of difficult pressing, low bulk density of zirconia sizing nozzle, unreasonable gradation and the like.
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Embodiment 1
[0037] combine figure 1 and 2 , the suspended state circulating granulation equipment of this embodiment includes a pressure pump 1, a feed port 2, a nozzle 3, a cyclone 4, a collector 5, a fan 6 and a mixing cylinder 7, wherein:
[0038] The cyclone 4 includes a core tube 401, an inlet 402, a cylinder 403 and a discharge port 404, the inlet 402 is located on the side of the cylinder 403, the core tube 401 communicates with the end of the cylinder 403, and the discharge port 404 is located on the side of the cylinder 403. the bottom of the body 403;
[0039] The pressure pump 1 communicates with the nozzle 3 to provide power for the material to be atomized to pass through the nozzle 3; the mixing cylinder 7 communicates with the inlet 402 of the cyclone 4, the nozzle 3 goes deep from the upper end of the mixing cylinder 7, and the feeding port 2 is set at the mixing At the bottom of the barrel 7, the screw feeder transports the raw materials from the feed port 2 to the mixin...
Embodiment 2
[0042] Step 1, the preparation of mixture:
[0043] 1) The raw materials include partially stabilized zirconia and monoclinic zirconia, and the chemical composition of partially stabilized zirconia is (wt%): ZrO 2 =95.02, HfO 2 =2.04, MgO=2.61, CaO=0.03, Al 2 o 3 =0.03, loss on ignition is 0.27, particle size is d 95 =4.5-5.0μm, the chemical composition of monoclinic zirconia is (wt%): ZrO 2 +HfO 2 >98 and SiO 2 50 =1.0~2.0μm, d 95 99.9; the particle size composition of cerium oxide powder is: d 50 =0.2~0.3μm, d 90 <1.8μm.
[0044] Accurately weigh the ingredients according to the dosage ratio of partially stabilized zirconia, monoclinic zirconia and cerium oxide micropowder as 54:42:4; put the above materials into a polyurethane ball mill jar, use zirconia ceramic balls, and grind for 24 hours. Ensure that the raw materials are fully mixed;
[0045] 2) Preparation and molding of blank
[0046] Step 1, the preparation of magnesia gel binding agent: preparation conc...
Embodiment 3
[0051] The difference between the present embodiment and embodiment 1 is: the feeder in the step 3 is changed to 800r / min, and the feeding rate is 7.5kg / min; the spray equipment pressure pump pressure calibration is 0.8Mpa; the flow rate is 0.45l / min; At this time, the dust collection efficiency reaches 54.1%, the granulation efficiency reaches 63%, and the particle size composition is biased towards the direction of small particles. The volume density of the prepared ceramic type zirconia sizing nozzle is 5.50g / cm 3 , the porosity of the finished product is 1.08%, the cold compressive strength is 1140Mpa, and the service life is 34 hours.
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Abstract
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