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Structure and preparation method of thermal insulation coating for riser pipe

A technology of thermal insulation coating and liquid riser, which is applied in the field of coating, can solve the problems of affecting the filling and feeding effect, poor thermal insulation performance, and reducing the actual passage of the liquid riser, so as to achieve good anti-sticking aluminum effect and improve Insulation effect, good anti-aluminum erosion effect

Active Publication Date: 2022-02-22
丹江口弘源碳化硅有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Structure and preparation method of thermal insulation coating for riser pipe

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Comparison scheme
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Embodiment 1

[0029] An insulation coating structure for a riser pipe, comprising an insulation layer coated on the inner wall of a silicon carbide ceramic riser pipe and a dense layer coated on the surface of the insulation 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 5mm...

Embodiment 2

[0042] An insulation coating structure for a riser pipe, comprising an insulation layer coated on the inner wall of a silicon carbide ceramic riser pipe and a dense layer coated on the surface of the insulation 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 thermal insulation coating structure, including coating on the inner wall surface of the silicon carbide 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 t...

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Abstract

The invention proposes a thermal insulation coating structure of the riser pipe, through the thermal insulation layer on the inner wall of the riser pipe and the dense layer coated on the surface of the thermal insulation layer, it not only has a good thermal insulation effect, but also prevents the upper part of the liquid riser from being easily Aluminum liquid slagging occurs, and the thermal insulation coating has a good anti-sticking aluminum effect; the thermal insulation coating structure of the riser pipe of the present invention uses alumina powder, fiber cotton, kaolin, and mullite powder as raw materials for the thermal insulation layer, so that The thermal conductivity of the prepared thermal insulation layer is low, and the thermal insulation effect is good; there is also gum in the thermal insulation layer, specifically peach gum, and the peach gum is pretreated, specifically prior to the mixed solvent of petroleum ether and acetone, and then adding three Sodium polyphosphate and diethylenetriamine are reacted, and then methacrylic acid is added to complete the pretreatment. The treated peach gum can further reduce the thermal conductivity and improve the thermal insulation effect.

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 Patents(China)
IPC IPC(8): C04B41/81C04B41/52
CPCC04B41/81C04B41/52C04B41/009
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 丹江口弘源碳化硅有限责任公司