Continuous casting crystallizer nano protection slag and preparing method thereof

A technology for continuous casting mold and mold flux, which is applied in the field of continuous casting mold nano mold flux and its preparation, can solve the problems that the mold flux is difficult to meet the requirements, and is beneficial to large-scale production and industrial application. The preparation method is simple, The effect of high thermal conductivity

Active Publication Date: 2019-04-26
CISDI ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these cases, in terms of heat transfer performance and lubricating performance, the current mold flux is generally difficult to meet the requirements

Method used

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  • Continuous casting crystallizer nano protection slag and preparing method thereof
  • Continuous casting crystallizer nano protection slag and preparing method thereof
  • Continuous casting crystallizer nano protection slag and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of continuous casting crystallizer nano mold powder is prepared, and its preparation method comprises the following steps:

[0035] (1) Select spherical nano-silicon carbide ceramic particles with intrinsic thermal conductivity of 100w / mk, particle size of 100nm, self-friction coefficient of 0.3, and self-lubricating properties, and disperse them by mechanical stirring for 3 hours to form dispersed spherical nano-silicon carbide ceramics granular system;

[0036] (2) The dispersed spherical nano-silicon carbide ceramic particle system obtained in 1ml step (1) is added to 1000ml with SiO 2 -CaO-Al 2 o 3 In the solid mold flux based on the powder, the volume ratio of nano-silicon carbide ceramic particles in the mold flux is 0.1%, and then high-energy ball milling at a speed of 100rpm is carried out. The ball milling time is 30min. After the ball milling, a continuous casting can be obtained. Crystallizer nano powder.

Embodiment 2

[0038] A kind of continuous casting crystallizer nano mold powder is prepared, and its preparation method comprises the following steps:

[0039] (1) Select spherical nano-silicon nitride particles with an intrinsic thermal conductivity of 500w / mk, a particle size of 80nm, a self-friction coefficient of 0.2, and self-lubricating properties, and disperse the spherical nano-silicon nitride particles for 10 minutes by ultrasonic method;

[0040] (2) Add the spherical nano-silicon nitride particles dispersed in 100ml step (1) to 500ml with SiO 2 -CaO-Al 2 o 3 In the mold flux based on the powder, the volume ratio of spherical nano-silicon nitride particles in the mold flux is 20%, and then high-energy ball milling at a speed of 800rpm is carried out, and the ball milling time is 1h. After the ball milling, a continuous casting can be obtained. Crystallizer nano powder.

Embodiment 3

[0042] A kind of continuous casting crystallizer nano mold powder is prepared, and its preparation method comprises the following steps:

[0043] (1) Select spherical nano-alumina ceramic particles with an intrinsic thermal conductivity of 1000w / mk, a particle size of 20nm, a self-friction coefficient of less than 0.1, and self-lubricating properties, and add a chemical dispersant for dispersion. The chemical dispersant is a lipophilic group Surfactants composed of hydrophilic groups, such as long-chain fatty acids, cetyltrimethylammonium bromide (CTAB), etc., to obtain dispersed spherical nano-alumina ceramic particles;

[0044] (2) Add the spherical nano-alumina ceramic particles dispersed in 500ml step (1) to 500ml with SiO 2 -CaO-Al 2 o 3 Based on the mold flux, and then high-energy ball milling at a speed of 1200rpm, the ball milling time is 2h, to obtain a continuous casting crystallizer nano mold flux.

[0045] In addition, the chemical dispersant can also be selecte...

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Abstract

The invention discloses continuous casting crystallizer nano protection slag and a preparing method thereof. Spherical nanoparticles with the volume ratio being 0.1 to 50% are doped in the protectionslag, due to the fact that that the spherical nanoparticles have the advantages of being high in heat conduction coefficient, good in sphericility degree, proper in grain size and the like, uniform and stable nanofluid is formed in the liquid protection slag, nano particles with the enough high interfaces between the particles and the enough low Van der Waals' effect potential can be formed in solid protection slag, the nano particles can be kept uniform distribution in the liquid-state protection slag, the obvious agglomeration does not exist, after the protection slag is added, the continuous casting crystallizer nano protection slag is formed, the excellent heat transfer property and the lubricating property can be achieved, the casting blank surface and the inner quality can be improved, and the method is suitable for producing products (like a super-thick plate) of the special requirement and products (like super-high pulling rate) of the particular continuous casting process.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy continuous casting mold slag, and in particular relates to a continuous casting crystallizer nano mold slag and a preparation method thereof. Background technique [0002] Continuous casting mold slag has a great influence on the surface and subcutaneous quality of the billet and the stability of the continuous casting process to ensure its forward movement. It is a key technology in the continuous casting process, especially for the solidification preparation of high-end steel grades or key metal materials produced by continuous casting especially important. In the continuous casting process, the mold flux mainly plays the role of controlling the solidification heat transfer and surface lubrication between the slag film and the slab. The metallurgical effect of these two aspects is directly related to the continuous casting process and the quality of the slab. For the continuous casting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 徐诗鑫朱科冯科
Owner CISDI ENG CO LTD
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