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CaO-ZrO2 composition, method for producing CaO-ZrO2 composition, CaO-ZrO2-containing refractory material, and casting nozzle

A technology for refractory materials and manufacturing methods, applied in casting equipment, manufacturing tools, casting melt containers, etc., can solve the problems of excessive corrosion resistance or strength reduction, inability to ensure, difficult adhesion performance, etc., and achieve the effect of reducing the amount of inclusions

Active Publication Date: 2022-05-17
KROSAKI HARIMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Moreover, on the working surface of the refractory material, due to the contact reaction with the inclusions in the steel, namely alumina, a phase containing ZrO2 as a low melting point phase is formed slag phase, but it is highly viscous. Depending on the flow rate of molten steel, sometimes inclusions such as alumina do not flow down, but adhere to the surface of the refractory material. Under the influence of steel types or operating conditions, it cannot The problem of ensuring stable hard-to-adhesive properties
[0016]In addition, since the addition of SiO2 components will make the refractory material contain it as a whole, it not only affects the self-protection of the contact surface with molten steel Fusibility, but also promotes the softening or self-melting of the refractory structure as a whole, so there are still problems such as corrosion resistance or excessive decline in strength.

Method used

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  • CaO-ZrO2 composition, method for producing CaO-ZrO2 composition, CaO-ZrO2-containing refractory material, and casting nozzle
  • CaO-ZrO2 composition, method for producing CaO-ZrO2 composition, CaO-ZrO2-containing refractory material, and casting nozzle
  • CaO-ZrO2 composition, method for producing CaO-ZrO2 composition, CaO-ZrO2-containing refractory material, and casting nozzle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0222] Examples are described below.

[0223] CaO-ZrO 2 Composition Example A

[0224] In the CaO-ZrO 2 In the embodiment A of composition, change CaO raw material and ZrO 2 The mass ratio of each raw material (raw material) of the raw materials, the molten state of the mixture, the presence or absence of CaO alone, and the width of CaO crystals were investigated.

[0225] The sample of this Example A was obtained under the following conditions.

[0226] Raw material (mass%) As CaO raw material (CaO source) quicklime with particle size structure ≤ 10mm was used, as ZrO 2 The source mainly uses unstable zirconia (decadeite) with a particle size structure of ≤10mm (approximately ≤3mm). In some embodiments, almost complete stable zirconia based on CaO and almost complete stable zirconia based on MgO are used. Zirconium ZrO 2 . The grain size structure of these CaO stabilized zirconia and MgO stabilized zirconia is also ≤10mm.

[0227] An electric furnace was used to melt ...

Embodiment A

[0282] Example A of the refractory material is, for CaO / ZrO in the chemical composition of the refractory material 2 An example of investigating the influence of mass ratio on alumina adhesion and hydration resistance.

[0283] In Example A of the refractory material, CaO and ZrO are mainly used 2 The CaO-ZrO of the present invention with different proportions 2 combination. The width of the monomeric CaO crystals in any composition is ≤50 μm.

[0284] Using CaO-ZrO 2 Composition, the carbon content of the refractory material (the total amount of graphite and carbon as a binder) was made 11.8% by mass, and CaO / ZrO was changed 2 mass ratio.

[0285] Moreover, the CaO-ZrO in the present invention was also investigated 2 On the basis of the composition, other CaO-based raw materials, ZrO 2 CaO / ZrO when similar raw materials 2 The effect of mass ratio.

[0286] And, carbonation treatment was carried out to the refractory material sample other than embodiment 23, in the Ca...

Embodiment B

[0308] Example B of the refractory material is an example of investigating the effects of the ratio of the carbon component in the chemical composition of the refractory material on the alumina adhesion, hydration resistance, and thermal expansion.

[0309] In addition, the increase and decrease of the ratio of carbon components to CaO components and ZrO 2 The influence of the range of the combined amount of the ingredients was also investigated together.

[0310] For the hydration resistance test and the alumina adhesion test, the same methods and evaluation criteria as in Example A of the refractory material were used.

[0311] The coefficient of thermal expansion (%) in a non-oxidizing atmosphere at 1000° C. was measured, and thermal expansion was evaluated by setting ≦0.5% as ○ (target value, good) and <0.5% as × (poor).

[0312] The casting nozzle, which is the main and important application of the refractory material of the present invention, requires high thermal shock...

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Abstract

The ZrO2-CaO-C refractory material provided by the invention has remarkable hydration resistance and self-fluxing resistance, so that the ZrO2-CaO-C refractory material has corrosion resistance and can maintain high adhesion resistance for a long time. This refractory material contains a CaO-ZrO2 composition which contains a CaO component in an amount of 40 to 60 mass% inclusive, has a CaO / ZrO2 component mass ratio of 0.67 to 1.5 inclusive, contains a eutectic structure of CaO crystals and CaZrO3 crystals, and has a width of the CaO crystals, which can be observed in the cross-sectional structure, of 50 [mu] m or less.

Description

technical field [0001] The invention relates to a CaO-ZrO with special composition and structure 2 Composition and the CaO-ZrO 2 A method for producing the composition, and a refractory material that suppresses the adhesion of alumina that occurs during continuous casting of molten steel, especially aluminum deoxidized killed steel, etc., and that can reduce harmful inclusions, and a casting using the refractory material Use a pouring nozzle (hereinafter, also simply referred to as a "sprinkling nozzle"). Background technique [0002] Alumina-like inclusions in molten steel have the property of accumulating on the surface of refractories through physical contact or chemical action with molten steel. Defects in castings reduce quality. In addition, if the aluminum oxide inclusions in the molten steel are deposited in the inner hole of the casting nozzle such as the submerged nozzle or the discharge hole that greatly affects the flow of the molten metal in the mold, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/484C04B35/057B22D41/54B22D11/10
CPCC04B35/484C04B35/057B22D41/54B22D11/10C04B2235/422C04B2235/3409C04B2235/3232C04B2235/447C04B2235/3239C04B2235/3826C04B2235/3821C04B2235/3206C04B2235/9676F27D3/14B22D41/505B22D41/52B22D41/58C04B35/053C04B2235/3208C04B2235/3244C04B35/66C04B2235/80C04B35/62815C04B35/62897C04B2235/6565C04B2235/3246C04B2235/5427C04B2235/9607C04B2235/428C04B35/657C04B2235/786C04B35/013C04B2235/425C04B2235/48C04B2235/5436C04B2235/5472C04B2235/96F27D1/0006C04B35/653C04B41/501C04B41/87C04B2235/442C04B2235/549
Inventor 李玲森川胜美佐佐木昭成松本成史
Owner KROSAKI HARIMA CORP
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