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Preparation method for corundum baddeleyite eutectoid composite nonswirl nozzle inner layer

A sizing nozzle and baddeleyite technology, which is applied in the field of preparation of corundum baddeleyite eutectoid composite sizing nozzle inner layer, can solve the problems of high melting point, high corrosion resistance, and the increase in the amount of chromium-containing industrial waste , increase in production costs, etc.

Inactive Publication Date: 2013-08-14
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The tetragonal zirconia phase did not exert its excellent properties of high melting point and high corrosion resistance, resulting in a short service life of the composite inner layer of the composite sizing nozzle
[0008] The problems caused by the quick change mechanism of the sizing nozzle of the tundish are the complex production process, complex equipment structure and operation, the increase in the amount of chromium-containing industrial waste, and the increase in production costs

Method used

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  • Preparation method for corundum baddeleyite eutectoid composite nonswirl nozzle inner layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1, get ZrOCl by weight percentage 2 .8H 2 O:Al(NO 3 ) 3 .9H 2 O: Y (NO 3 ) 3 =70:30:3, prepare mother liquor, add dispersant (TH-908 ceramic dispersant) of 1.2% of the total weight of material, NH4(OH) positive titration, stir until PH=7-10, obtain gel, age 12h; Vacuum filtration at -0.095MPa, washing with deionized water until silver nitrate cannot detect Cl - up to; then react at 500°C for 2 hours, then raise the temperature to 700°C, react for 10 hours, degumming after the reaction is completed, that is, ZrO 2 = 45±1% ZrO 2 -Al 2 o 3 Compound powder. The particle sizes are 1 μm to 3 μm, 5 μm to 15 μm, and 30 μm to 90 μm.

[0027] Step 2, the above-mentioned ZrO with different average particle diameters 2 -Al 2 o 3 The composite powder is graded, and its composition is as follows: 30% of the particle size is 1 μm to 3 μm, 15% of the particle size is 5 μm to 15 μm, and 55% of the particle size is 30 μm to 90 μm.

[0028] Step 3, according to the abo...

Embodiment 2

[0030] The difference between this embodiment and embodiment 1 is: the ZrO in the step 3 2 -Al 2 o 3 The gradation composition of the composite powder is 90% by mass ratio, 10% of rare earth element additives, and co-milled for 24 hours; other steps are the same as in Example 1, and the corundum baddeleyite eutectoid content is also obtained ≥ 90%, and the service life can reach 23 hours The inner layer of the composite sizing nozzle.

Embodiment 3

[0032] The difference between this embodiment and embodiment 1 is: the ZrO in the step 3 2 -Al 2 o 3 The gradation composition of the composite powder is 95% by mass ratio, 5% of rare earth element additives, and co-milled for 36 hours; other steps are the same as in Example 1, and the corundum baddeleyite eutectoid content is also obtained ≥ 90%, and the service life can reach 23 hours The inner layer of the composite sizing nozzle.

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Abstract

The invention discloses a preparation method for a corundum baddeleyite eutectoid composite nonswirl nozzle inner layer. The method comprises the following steps: preparing ZrO2-Al2O3 composite powder; grading the grain size of the ZrO2-Al2O3 composite powder; adding a rare earth additive; grinding for 24 to 48 hours; adding ZrO2-Al2O3 gel, in amount which is 5 to 10 percent of the total amount of the materials, serving as a binding agent; performing isostatic pressing; drying at the temperature of 105 + / - 5 DEG C for 24 hours; and sintering at the temperature of 1,700 and 1,720 DEG C to prepare the corundum baddeleyite eutectoid composite nonswirl nozzle inner layer, wherein the zirconium oxide (ZrO2) content is 45 + / - 1 percent, the ZrO2+Al2O3 is more than or equal to 95 percent, the corundum baddeleyite eutectoid content is more than or equal to 90 percent, the volume density is 4.50 to 4.60 g / cm<3>, and the cold state pressure-resistant strength is more than or equal to 300 MPa. The result of a test of an applicant shows that the service life can reach 23 hours.

Description

technical field [0001] The invention relates to the preparation of a device for controlling the flow of molten steel in a continuous casting tundish in the iron and steel metallurgical industry, in particular to a method for preparing the inner layer of a corundum badley zircon eutectoid composite sizing nozzle. 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 molten steel flowing into the mold per unit time must ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/54C04B35/66C04B35/106C04B35/622
Inventor 薛群虎武志红田晓利曹怡毕波
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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