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zro 2 ‑al 2 o 3 Method and equipment for preparing zirconia sizing nozzle from composite powder

A technology of zro2-al2o3 and sizing nozzle is applied in the field of ZrO2-Al2O3 composite powder to prepare zirconia sizing nozzle, which can solve the problems of high porosity, unreasonable gradation, poor shape and fluidity of blank particles, etc. The effect of improving the seismic stability performance and reducing the porosity of the finished product

Inactive Publication Date: 2017-04-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects and deficiencies in the prior art, the present invention solves the problems of low volume density, high porosity and high difficulty in product pressing and forming of the existing zirconia sizing nozzle, and also overcomes the problem of dry powder making mechanical humidification. There are problems such as poor particle shape and fluidity, unreasonable gradation, etc.

Method used

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  • zro <sub>2</sub> ‑al <sub>2</sub> o <sub>3</sub> Method and equipment for preparing zirconia sizing nozzle from composite powder
  • zro <sub>2</sub> ‑al <sub>2</sub> o <sub>3</sub> Method and equipment for preparing zirconia sizing nozzle from composite powder
  • zro <sub>2</sub> ‑al <sub>2</sub> o <sub>3</sub> Method and equipment for preparing zirconia sizing nozzle from composite powder

Examples

Experimental program
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Effect test

Embodiment 1

[0037] combine figure 1 with 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 mixi...

Embodiment 2

[0043] Step 1, the preparation of mixture:

[0044] 1) Raw materials include partially stabilized zirconia, monoclinic zirconia and Al 2 o 3 -ZrO 2 Composite powder, 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 =1.0-5.0 μm, the chemical composition of monoclinic zirconia is (wt%): ZrO 2 +HfO 2 >98 and SiO 2 50 =1.0~2.0μm, d 95 2 o 3 -ZrO 2 The main chemical composition of the composite powder is (wt%): ZrO 2 +HfO 2 +Al 2 o 3 +Y 2 o 3 >99,Al 2 o 3 -ZrO 2 The particle size composition of the composite powder is: d 10 = 0.56 μm, d 50 = 1.12 μm, d 90 2 -Al 2 o 3 The dosage ratio of the composite powder is 47:50:3 and the proportion is accurate. Put the above materials into a polyurethane ball mill tank, use zirconia ceramic balls, and grind for 24 hours to ensure that the raw materials are fully mixed;

[0045] 2) ZrO 2 -A...

Embodiment 3

[0056] The difference between this embodiment and embodiment 2 is: the ZrO in the step one 2 / Al 2 o 3 ZrO in composite powder 2 / Al 2 o 3 The ratio is adjusted to ZrO 2 / Al 2 o 3 =58 / 42; according to partially stabilized zirconia, monoclinic zirconia and ZrO 2 -Al 2 o 3 The dosage ratio of the composite powder is 46:50:4 and the proportion is accurate. Put the above materials into a polyurethane ball mill tank, use zirconia ceramic balls, and grind together for 24 hours to ensure that the raw materials are fully mixed; the ceramic type zirconia is produced Quality composite sizing nozzle composite inner layer, there is no burst during use, and the service life is 42h.

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Abstract

The invention discloses a method and equipment for preparing a zirconia sizing nozzle with ZrO2-Al2O3 composite powder. The method comprises spraying and granulating additives, binders and powders to obtain granules, separating the granules to obtain blanks, and making the obtained blanks Firing at 1700-1710°C to obtain a zirconia sizing nozzle; the powder includes partially stabilized zirconia, monoclinic zirconia and ZrO2-Al2O3 composite powder, partially stabilized zirconia, monoclinic zirconia and ZrO2 The dosage ratio of ‑Al2O3 composite powder is (40~50):(50~60):(2~4); the binder is zirconia gel; the ceramic type zirconia is produced through the suspended state circulation granulation process Quality sizing nozzle press molding blank, the blank is aged, dehydrated and formed, the blank is dried at 105±5°C for 24 hours, and after firing, a ceramic zirconia sizing nozzle is made, and its volume density is higher than that of ordinary The humidification and granulation process is improved by about 3-5%, the porosity of the finished product is reduced by 75%-80%, and the service life can reach more than 40 hours.

Description

technical field [0001] The invention relates to a preparation process of a forming blank for a functional refractory material used in a device for controlling molten steel flow in a continuous casting tundish in the iron and steel metallurgy industry, specifically ZrO 2 -Al 2 o 3 A method and equipment for preparing a zirconia sizing nozzle from composite powder. Background technique [0002] The sizing nozzle refers to a functional device made of high-temperature structural ceramics installed at the bottom of the continuous casting tundish. Its main function is that the static pressure of the molten steel in the tundish remains basically unchanged, the molten steel flows into the crystallizer through the sizing nozzle, and the crystallizer is cooled by a large flow of water to take away the heat released when the molten steel solidifies, so that the molten steel solidifies into a billet. Since the heat taken away by the water cooling of the mold is limited, the amount of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/66C04B35/622
Inventor 薛群虎赵亮张晗张会
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY