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Riser tube heat preservation coating structure and preparation method thereof

A technology of thermal insulation coating and liquid riser, applied in the field of coating, can solve the problems of poor thermal insulation performance, affecting the filling and feeding effect, reducing the actual passage of the liquid riser, etc., to achieve improved thermal insulation effect and good anti-sticking effect. Aluminum effect, good anti-aluminum corrosion effect

Active Publication Date: 2020-07-14
HANJIANG HONGYUAN XIANGYANG SILICON CARBIDE SPECIAL CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Silicon carbide ceramics is an ideal material for the riser, but the heat conductivity of the riser made of silicon carbide ceramics is good, resulting in poor thermal insulation performance. During the filling process of the aluminum liquid, the upper part of the riser is prone to aluminum liquid slagging , which reduces the actual channel of the riser, thus affecting the filling and feeding effect

Method used

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  • Riser tube heat preservation coating structure and preparation method thereof

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Embodiment 1

[0029] An insulating coating structure for a rising pipe, comprising an insulating layer coated on the inner wall of a silicon nitride ceramic rising pipe and a dense layer coated on the surface of the insulating layer;

[0030] Among them, the insulation layer includes alumina powder, fiber cotton, kaolin, mullite powder, sodium carboxymethyl cellulose, gum, polypropylene short fibers and wollastonite; the dense layer includes boron nitride, aluminum nitride, zirconium silicate , silica sol, lignin fiber and glass fiber.

[0031] The mass ratio of alumina powder, fiber cotton, kaolin, mullite powder, sodium carboxymethyl cellulose, gum, polypropylene short fiber and wollastonite in the insulation layer is 60:12:4:12:3:3:1 :10; the mass ratio of boron nitride, aluminum nitride, zirconium silicate, silica sol, lignocellulose and glass fiber in the dense layer is 25:20:10:2:3:1. The gum here can be peach gum, Arabic gum, etc.

[0032] The thickness of the insulation layer is 5...

Embodiment 2

[0042] An insulating coating structure for a rising pipe, comprising an insulating layer coated on the inner wall of a silicon nitride ceramic rising pipe and a dense layer coated on the surface of the insulating layer;

[0043]Among them, the insulation layer includes alumina powder, fiber cotton, kaolin, mullite powder, sodium carboxymethyl cellulose, gum, polypropylene short fibers and wollastonite; the dense layer includes boron nitride, aluminum nitride, zirconium silicate , silica sol, lignin fiber and glass fiber.

[0044] The mass ratio of alumina powder, fiber cotton, kaolin, mullite powder, sodium carboxymethyl cellulose, gum, polypropylene short fiber and wollastonite in the insulation layer is 70:15:5:14:6:5:2 : 13; the mass ratio of boron nitride, aluminum nitride, zirconium silicate, silica sol, lignocellulose and glass fiber in the dense layer is 28:22:13:4:5:2.

[0045] The thickness of the insulation layer is 8mm, and the thickness of the dense layer is 0.8mm...

Embodiment 3

[0054] A riser pipe insulation coating structure, including coating on the inner wall surface of the silicon nitride ceramic riser pipe

[0055] The insulation layer and the dense layer coated on the surface of the insulation layer;

[0056] Among them, the insulation layer includes alumina powder, fiber cotton, kaolin, mullite powder, sodium carboxymethyl cellulose, gum, polypropylene short fibers and wollastonite; the dense layer includes boron nitride, aluminum nitride, zirconium silicate , silica sol, lignin fiber and glass fiber.

[0057] The mass ratio of alumina powder, fiber cotton, kaolin, mullite powder, sodium carboxymethyl cellulose, gum, polypropylene short fiber and wollastonite in the insulation layer is 80:18:6:16:8:8:3 :15; the mass ratio of boron nitride, aluminum nitride, zirconium silicate, silica sol, lignocellulose and glass fiber in the dense layer is 30:25:15:6:6:3.

[0058] The thickness of the insulation layer is 10mm, and the thickness of the dense...

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Abstract

The present invention provides a riser tube heat preservation coating structure, by means of the heat preservation layer on the inner wall face of the riser tube and the compact layer coating the surface of the heat preservation layer, the good heat preservation effect is achieved, molten aluminum slagging is prevented from being likely to happen to the upper portion of the riser tube, and meanwhile the heat preservation coating has the good aluminum sticking preventing effect; according to the riser tube heat preservation coating structure, the heat preservation layer is made of the aluminumoxide powder, the cellucotton, the kaolin and the mullite powder, so that the prepared heat preservation layer is low in heat conductivity coefficient and good in heat preservation effect; the heat preservation layer is further provided with gum, particularly peach gum, the peach gum is pretreated, specifically, sodium tripolyphosphate and diethylenetriamine are added into the mixed solvent of petroleum ether and acetone for a reaction, methacrylic acid is added for a reaction, pretreatment is completed, the heat conductivity coefficient of the treated peach gum can be further reduced, and theheat preservation effect is improved.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a riser pipe insulation coating structure and a preparation method. Background technique [0002] The riser tube is one of the key components of the aluminum alloy low-pressure casting machine. It is placed in the closed holding furnace of the low-pressure casting machine for aluminum liquid during work, and the aluminum melt (about 700-900 ° C) is forced to pass through a certain air pressure. The liquid moves upward along the liquid riser to realize filling and feeding of the aluminum liquid. The aluminum liquid filling process needs to maintain a pressure of 0.08-0.1MPa. Therefore, the riser pipe is required to have good air tightness, high temperature resistance, thermal shock resistance and corrosion resistance to molten aluminum, as well as long-term thermal shock fatigue resistance. [0003] Silicon carbide ceramics is an ideal material for the riser pipe, but the heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/81C04B41/52
CPCC04B41/81C04B41/52C04B41/009C04B41/5037C04B41/5035C04B41/5031C04B41/5024C04B41/4803C04B41/474C04B41/4596C04B41/4539C04B41/0072C04B41/5089C04B41/5064C04B41/5063C04B41/45C04B35/565
Inventor 刘凯李秋南王惠民许斌吴急涛夏志强赵红飞黄涛童捷赵涛
Owner HANJIANG HONGYUAN XIANGYANG SILICON CARBIDE SPECIAL CERAMICS