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Inner heater protection tube made of silicon carbide ceramic composite material and preparation method thereof

A technology of silicon carbide ceramics and composite materials, applied in the field of inorganic non-metallic materials, can solve the problems of short service life, poor corrosion resistance and high cost, and achieve the effects of long service life, reduced production cost, and improved toughness and strength

Active Publication Date: 2014-06-04
山东宝纳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inner heater protection tube made of stainless steel has poor corrosion resistance. Taking the inner heater protection tube for molten zinc as an example, at 700°C, 1Cr18Ni9Ti (ordinary stainless steel SUS321, the tissue type is austenitic) stainless steel material is 8 in the zinc liquid. It is completely dissolved and corroded within an hour, thus limiting its use; the cost of silicon nitride internal heater protection tube is high, and pure silicon nitride internal heater protection tube is difficult to prepare. At present, silicon nitride and silicon carbide are mostly used to prepare internal heaters However, its service life is short; SiC ceramics have obvious advantages such as good heat transfer performance and good corrosion resistance, and the production process is relatively simple and low cost. It is an ideal material for preparing internal heater protection tubes. However, in In actual use, it is found that the pure silicon carbide ceramic internal heater protection tube is easily broken under the rapid cooling of the metal solution, resulting in a short service life

Method used

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  • Inner heater protection tube made of silicon carbide ceramic composite material and preparation method thereof
  • Inner heater protection tube made of silicon carbide ceramic composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A method for preparing a silicon carbide ceramic composite internal heater protection tube, the steps are as follows:

[0045] (1) Preform preparation

[0046] fixed carbon fiber figure 1 The prefabricated body in the shape of the silicon carbide ceramic composite inner heater protection tube is as follows: L7=840mm, L5=4mm, D5=150mm, D6=146mm, D4=156mm.

[0047] (2) Pretreatment

[0048] Calcining the preform treated in step (1) at 500°C for 60 minutes under a nitrogen protective atmosphere to obtain a pretreated preform;

[0049] (3) Coating carbon protective layer

[0050] Immerse the preform pretreated in step (2) into the impregnation solution, the mass fraction of carbon black in the impregnation solution is 45%, the mass fraction of phenolic resin is 5%, and the balance is ethanol, impregnated for 2.5h, Then dry at 50°C for 25 minutes to obtain a preform coated with a thin carbon layer;

[0051] (4) Grouting molding

[0052] Put the prefabricated body coate...

Embodiment 2

[0070] A method for preparing a silicon carbide ceramic composite internal heater protection tube, the steps are as follows:

[0071] (1) Preform preparation

[0072] Fix the graphite fibers as figure 1 The prefabricated body in the shape of the silicon carbide ceramic composite inner heater protection tube is as follows: L7=650mm, L5=4mm, D5=120mm, D6=114mm, D4=127mm.

[0073] (2) Pretreatment

[0074] Calcining the preform treated in step (1) at 500°C for 60 minutes under a nitrogen protective atmosphere to obtain a pretreated preform;

[0075] (3) Coating carbon protective layer

[0076] Immerse the preform pretreated in step (2) into the impregnation solution, the mass fraction of carbon black in the impregnation solution is 30%, the mass fraction of phenolic resin is 5%, and the balance is ethanol, impregnate for 2 hours, and then Drying at 50°C for 30 minutes to obtain a preform coated with a thin carbon layer;

[0077] (4) Grouting molding

[0078] Put the prefabr...

Embodiment 3

[0087] A method for preparing a silicon carbide ceramic composite internal heater protection tube, the steps are as follows:

[0088] (1) Preform preparation

[0089] Fix the carbon fiber felt as figure 1 The prefabricated body in the shape of the silicon carbide ceramic composite inner heater protection tube is as follows: L7=840mm, L5=4mm, D5=150mm, D6=146mm, D4=156mm.

[0090] (2) Pretreatment

[0091] Calcining the preform treated in step (1) at 500°C for 90 minutes under a nitrogen protective atmosphere to obtain a pretreated preform;

[0092] (3) Coating carbon protective layer

[0093] Immerse the preform pretreated in step (2) in the impregnating solution, the mass fraction of carbon black in the impregnating solution is 40%, the mass fraction of phenolic resin is 5%, and the balance is ethanol, impregnating for 3.5h, Then dry at 50°C for 35 minutes to obtain a preform coated with a thin carbon layer;

[0094] (4) Grouting molding

[0095] Put the prefabricated b...

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Abstract

The invention relates to an inner heater protection tube made of silicon carbide ceramic composite material and a preparation method thereof. The inner heater protection tube made of silicon carbide ceramic composite material comprises an outer silicon carbide layer, an inner silicon carbide layer and a carbon fiber reinforced layer; the outer silicon carbide layer is arranged on the outer surface of the carbon fiber reinforced layer, and the inner silicon carbide layer is arranged on the inner surface of the carbon fiber reinforced layer. The invention also relates to a preparation method of the inner heater protection tube made of silicon carbide ceramic composite material. The inner heater protection tube made of silicon carbide ceramic composite material prepared by the invention has high thermal conductivity, good thermal shock resistance, corrosion resistance, and long service life; when used in the metal smelting field, the inner heater protection tube of the invention can reduce the number and cost of equipment shutdown maintenance and replacement, significantly improve the production efficiency, and reduces the production cost.

Description

technical field [0001] The invention relates to a silicon carbide ceramic composite internal heater protection tube and a preparation method thereof, belonging to the technical field of inorganic non-metallic materials. Background technique [0002] The inner heater protection tube is an important part to transfer the heat of the heater to the molten metal, prevent the erosion of the heater, and ensure that the molten metal is not polluted by the heater. It has broad application prospects in the smelting of zinc, aluminum, silver and other metals. [0003] At present, the commonly used internal heater protection tubes are mainly made of stainless steel, silicon nitride, silicon carbide and other materials. The inner heater protection tube made of stainless steel has poor corrosion resistance. Taking the inner heater protection tube for molten zinc as an example, at 700°C, 1Cr18Ni9Ti (ordinary stainless steel SUS321, the tissue type is austenitic) stainless steel material is ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/565C04B35/622
Inventor 张玉军李兆敏李其松翟彦霞贺超刘欢
Owner 山东宝纳新材料有限公司
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