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High-strength composite submersed nozzle combined with silicon carbide crystal whiskers and manufacturing method

A silicon carbide whisker, immersion technology, used in manufacturing tools, casting equipment, casting melt containers, etc., can solve the problems of low reactivity and separation, and achieve less impurities and defects on the whisker surface, uniform crystal composition, The effect of good high temperature strength

Active Publication Date: 2016-06-08
鞍山市和丰耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patent adopts the structure of the outer layer of the nozzle composited with the carbon-free inner layer. However, due to the low interface reactivity of the inner layer and the outer layer at high temperature, the two layers are still solid-solid bonded. When cooling, the expansion coefficients of the two layers of materials will be different. Causes the two layers to shrink separately, causing the outer layer of the nozzle to separate from the carbon-free inner layer

Method used

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  • High-strength composite submersed nozzle combined with silicon carbide crystal whiskers and manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0024] Silicon carbide whiskers combined with high-strength composite submerged nozzles. Including the outer body, the outer slag line section, the inner layer, and the interface layer.

[0025] Outer body raw materials and their mass percentages: white corundum 20%, tabular corundum 40%, calcined alumina 10%, flake graphite 20%, silicon carbide 5%, metal silicon 3%, boron carbide 2%, additional raw materials Total 10% thermosetting phenolic resin.

[0026] The raw materials of the outer slag line section and their mass percentages: 80% fused stabilized zirconia, 12% flake graphite, 6% zircon mullite, 2% boron carbide, plus 8% thermosetting phenolic resin binder in the total amount of raw materials.

[0027] Inner layer raw materials and their mass percentages: 45% tabular corundum, 15% white corundum, 10% calcined alumina, 15% sialon, 15% silicon nitride, plus 8% aluminum sol binder.

[0028]Interface layer raw materials and their mass percentages: 60% tabular corundum, 10%...

Embodiment 2

[0036] Silicon carbide whiskers combined with high-strength composite submerged nozzles. Including the outer body, the outer slag line section, the inner layer, and the interface layer.

[0037] Outer body raw materials and their mass percentages: 60% tabular corundum, 8% calcined alumina, 20% flake graphite, 5% zircon mullite, 3% metal silicon, 2% boron carbide, 2% silicon carbide, The total amount of raw materials added is 9% thermosetting phenolic resin.

[0038] Raw materials of the outer slag line section and their mass percentages: 75% fused stabilized zirconia, 12% flake graphite, 8% zircon mullite, 3% silicon carbide, 2% metal silicon powder, and 9% of the total amount of additional raw materials. Thermosetting Phenolic resin binder.

[0039] Inner layer raw materials and their mass percentages: 15% tabular corundum, 45% white corundum, 10% calcined alumina, 15% sialon, 15% silicon nitride, plus 8% aluminum sol binder.

[0040] Interface layer raw materials and thei...

Embodiment 3

[0048] Silicon carbide whiskers combined with high-strength composite submerged nozzles. Including the outer body, the outer slag line section, the inner layer, and the interface layer.

[0049] Outer body raw materials and their mass percentages: 50% tabular corundum, 10% white corundum, 10% calcined alumina, 15% flake graphite, 5% silicon carbide, 3% metallic silicon, 2% boron carbide, additional raw materials Total 8% thermosetting phenolic resin.

[0050] The raw materials of the outer layer slag line section and their mass percentages: 80% fused stabilized zirconia, 10% graphite flakes, 8% zirconium mullite, 2% boron carbide, plus 8% thermosetting phenolic resin binder in the total amount of raw materials.

[0051] Inner layer raw materials and their mass percentages: 60% of white corundum, 8% of calcined alumina, 15% of sialon, 12% of aron, 5% of silicon nitride, and 7% of the total amount of raw materials plus aluminum sol binder.

[0052] Interface layer raw material...

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Abstract

The invention relates to a high-strength composite submersed nozzle combined with silicon carbide crystal whiskers. The high-strength composite submersed nozzle comprises an outer layer body, an outer layer slag line segment, an inner layer and a boundary layer; the boundary layer is composed of, by weight, 40-60% of one or two kinds of white corundum and tabular corundum, 3-10% of calcined alumina, 15-40% of one or more kinds of SIALON, ALON and silicon nitride and boundary sols accounting for 8-10% of raw materials of the boundary layer in weight; the boundary sols are formed by mixing 60-80% of metasilicic acid ethyl esters and 20-40% of cane sugar uniformly and then treating the mixtures at 40-60 DEG C for 12-24 hours. The sols in the boundary layer react for generating the bamboo-like and reed-like beta-silicon carbide crystal whiskers with the end faces pointed at high temperature, the beta-silicon carbide crystal whiskers of the structure are embedded into the outer layer and the inner layer of the nozzle, and therefore the two composite layers can be combined closely.

Description

technical field [0001] The invention relates to a silicon carbide whisker combined high-strength composite submerged nozzle used in the production process of continuous cast steel and a manufacturing method. The invention belongs to the field of refractory materials for iron and steel metallurgy. Background technique [0002] The submerged nozzle is the passage of molten steel from the tundish to the mold, which is used to protect the molten steel from contact with the outside air, prevent the oxidation of the molten steel, promote the floating of non-metallic impurities, prevent the entrainment of mold slag in the molten steel, and prevent the flow of molten steel in the mold. . In the process of use, in addition to the mechanical erosion of high-temperature molten steel, thermal stress and chemical erosion of mold slag, the submerged nozzle will also produce nodules and blockage, especially the Al 2 o 3 - When the C submerged nozzle is pouring aluminum-killed steel and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/54
CPCB22D41/54
Inventor 李心慰曲殿利吴锋徐娜栾旭
Owner 鞍山市和丰耐火材料有限公司
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