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Refractory material

A refractory material and raw material technology, applied in the field of refractory materials, can solve problems such as flow control obstruction, steel breakout, chemical damage, etc., achieve high corrosion resistance and thermal shock resistance, suppress the increase in manufacturing costs, and shorten the manufacturing cycle. Effect

Pending Publication Date: 2022-07-08
KROSAKI HARIMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The occurrence of cracks impairs the gas-tightness of SNP, which promotes chemical damage, and causes pig iron to permeate or melt locally around the cracks, hindering flow control, and may cause breakouts in some cases.

Method used

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  • Refractory material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0102] Example A is an example in which influences on thermal shock resistance, surface roughness, corrosion resistance, etc. were investigated by changing the apparent porosity, the ratio of the pore volume of pores having a pore diameter of 1 μm or less, and the air permeability.

[0103] The raw material of the refractory material of this example A is the most common Al 2 O 3 class, the main body is an artificial particle composed of corundum, which is Al 2 O 3 -ZrO 2 Mass particles, SiC and B4C powder, metal Al powder, the total volume ratio of (Vf / Vr) obtained by the above-mentioned method is 1.0 or more and 1.6 or less, and the total volume ratio of (Vf+Vr) obtained by the method is 50 In the range of volume % or more and 80 volume % or less, the kneaded clay for forming was adjusted to substantially the same value in all the examples.

[0104] The same applies to Examples B to D to be described later.

[0105] In addition, in Tables 1 to 4, the chemical components ...

Embodiment B

[0125] Example B is an example in which influences on thermal shock resistance, surface roughness, corrosion resistance, and the like were investigated by changing the apparent porosity and the ratio of the pore volume of pores having a pore diameter of 1 μm or less.

[0126] In addition, each example in this Example B was obtained by adjusting the above-mentioned (Vf / Vr).

[0127] Table 2 shows the constitution and results of each example.

[0128] (Table 2)

[0129]

[0130] It was found that the apparent porosity, the ratio of the pore volume of pores having a pore diameter of 1 μm or less, and the air permeability also changed with the change of (Vf / Vr). In all the examples in which (Vf / Vr) satisfies 1.0 or more and 1.6 or less, the thermal shock resistance, surface roughness, corrosion resistance (to FeO), and corrosion resistance (to CaO) are all acceptable (evaluated as 0 (excellent). ) or Δ (good)) or better results than the impregnated product, that is, Comparati...

Embodiment C

[0133] Example C is an example in which influences on thermal shock resistance, surface roughness, corrosion resistance, and the like were investigated by changing the apparent porosity and air permeability.

[0134] In addition, each example in this Example C was obtained by adjusting the above-mentioned (Vf+Vr).

[0135] Table 3 shows the constitution and results of each example.

[0136] (table 3)

[0137]

[0138] It can be seen that the air permeability changes as (Vf+Vr) changes. In all the examples in which (Vf+Vr) satisfies 50 or more and 80 or less, thermal shock resistance, surface roughness, corrosion resistance (to FeO), and corrosion resistance (to CaO) are all acceptable (evaluated as 0 (excellent). ) or Δ (good)) or better results than the impregnated product, that is, Comparative Example 5 (Table 1).

[0139] On the other hand, in Comparative Example 8, Comparative Example 9, and Comparative Example 10 in which (Vf+Vr) was not within the range of the pres...

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PUM

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Abstract

Provided is a refractory material which is not impregnated with asphalt or the like and which has higher corrosion resistance and thermal shock resistance than an impregnated product such as asphalt or the like. Specifically, the refractory material of the present invention is characterized in that, in a refractory material not impregnated with tar or pitch, the apparent porosity of a refractory material sample after heat treatment in a non-oxidizing atmosphere at 1200 DEG C is 7% or less, and the apparent porosity of the refractory material sample after heat treatment in a non-oxidizing atmosphere at 1200 DEG C is 7% or less. The sum of the pore volumes of pores having a pore diameter of 1 [mu] m or less is 80% or more of the cumulative pore volume of the entire refractory material sample, and the air permeability is 50 * 10-17 m2 or less.

Description

technical field [0001] The present invention relates to a refractory material not impregnated with tar, pitch, etc., and particularly to a sliding nozzle for controlling the flow rate of molten steel when discharging molten steel from a ladle or a tundish in continuous casting of steel, or a sliding nozzle provided on the upper part thereof A refractory material for a nozzle (hereinafter, also simply referred to as a "nozzle") for forming a passage of molten steel. Background technique [0002] Hereinafter, among the refractory materials, a refractory material for a sliding nozzle for continuous casting, specifically a sliding nozzle plate (hereinafter also referred to as "SNP"), is mainly cited and explained. [0003] SNP is a member used for a sliding nozzle when pouring molten steel from a molten steel ladle to a tundish or from a tundish to a mold, and is a plate-shaped refractory material having a molten steel passage hole near the center thereof. Furthermore, two or t...

Claims

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Application Information

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IPC IPC(8): C04B35/103C04B35/106B22D11/10B22D41/32
CPCB22D41/32C04B35/103C04B35/106C04B35/1015C04B35/101C04B35/043C04B35/482C04B35/14C04B2235/3217C04B2235/3418C04B2235/3206C04B2235/3244C04B2235/3241C04B2235/3208C04B2235/3821C04B2235/3826C04B2235/401C04B2235/402C04B2235/428C04B2235/422C04B2235/77C04B2235/96C04B2235/9669C04B2235/963B22D41/54C04B38/0054C04B2235/54C04B2235/9607C04B2235/9684
Inventor 高见行平森川胜美松本成史
Owner KROSAKI HARIMA CORP
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