Method and device for preparing zirconia sizing nozzle with ZrO2-Al2O3 composite powder

A technology of zrO2-al2o3 and sizing nozzle, which is applied in the field of ZrO2-Al2O3 composite powder to prepare zirconia sizing nozzle and equipment, can solve the problems of high porosity, unreasonable gradation, blank particle shape and poor fluidity, etc. Achieve the effect of improving thermal shock stability and reducing the porosity of finished products

Inactive Publication Date: 2015-08-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
View PDF2 Cites 8 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for preparing zirconia sizing nozzle with ZrO2-Al2O3 composite powder
  • Method and device for preparing zirconia sizing nozzle with ZrO2-Al2O3 composite powder
  • Method and device for preparing zirconia sizing nozzle with ZrO2-Al2O3 composite powder

Examples

Experimental program
Comparison scheme
Effect test

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

[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 -...

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 obtained. Quality composite sizing nozzle composite inner layer, there is no burst during use, and the service life is 42h.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Cold compressive strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method and a device for preparing a zirconia sizing nozzle with ZrO2-Al2O3 composite powder. According to the method, an additive, a binding agent and a powder material are subjected to spray granulation, such that a particulate matter is obtained; the particulate matter is separated, such that a blank is obtained; the blank is fired under a temperature of 1700-1710 DEG C, such that the zirconia sizing nozzle is obtained. The powder material comprises partially stabilized zirconia, monoclinic zirconia and ZrO2-Al2O3 composite powder with a dosage ratio of (40-50):(50-60):(2-4). The binding agent is zirconia gel. The blank used in ceramic zirconia sizing nozzle compression molding is prepared with a suspended cyclic granulation process. The blank is subjected to aging, dehydration and molding, and is dried for 24h under a temperature of 105+ / -5 DEG C. the ceramic zirconia sizing nozzle is obtained after firing. Compared with that obtained with a common humidifying granulation process, the finished product of the sizing nozzle has a bulk density improved by 3-5%, a porosity reduced by 75-80%, and a service life of more than 40h.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap