A kind of preparation method of 3D printing monolithic silicon carbide heat shield

A 3D printing, heat shield technology, applied in lighting and heating equipment, manufacturing tools, furnaces, etc., can solve problems such as reducing heat insulation performance, and achieve the effects of low thermal conductivity, reduced conduction loss, and good controllability

Active Publication Date: 2022-02-01
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the reaction of carbon felt and graphite felt with oxygen, water vapor and oil vapor, the thermal insulation performance will be reduced

Method used

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  • A kind of preparation method of 3D printing monolithic silicon carbide heat shield
  • A kind of preparation method of 3D printing monolithic silicon carbide heat shield
  • A kind of preparation method of 3D printing monolithic silicon carbide heat shield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like Figure 1-3 As shown, a preparation method of a 3D printed monolithic silicon carbide heat shield includes the following steps:

[0034] (1) Slice and layer the model of the designed heat shield, determine the printing program according to the structure, and import the program into the 3D printing equipment program; The ionized water was evenly mixed and ball-milled for 2 hours, and then the ball-milled slurry was vacuum-defoamed in a vacuum defoamer for 10 minutes to obtain ceramic slurry;

[0035] The proportion of silicon carbide ceramic powder is 50wt%, the proportion of dispersant is 0.1wt%, the proportion of binder is 0.1wt%, the proportion of deionized water is 49.79wt%, and the proportion of defoaming agent is 0.01%. The dispersing agent adopts ammonia water, and the binder adopts sodium carboxymethyl cellulose; (3) adding the prepared ceramic slurry into the barrel of the 3D printer, under the control of the printing program described in step (1) The cer...

Embodiment 2

[0037] like Figure 4-6 As shown, a preparation method of a 3D printed monolithic silicon carbide heat shield includes the following steps:

[0038](1) slice and layer the model of the designed heat shield, determine the printing program according to the structure, and import the program into the 3D printing equipment program; (2) combine silicon carbide powder, dispersant, binder, Ionized water was mixed evenly and ball milled for 12 hours, and then the ball milled slurry was vacuum defoamed for 35 minutes in a vacuum defoaming machine to obtain a ceramic slurry; the proportion of silicon carbide ceramic powder was 60wt%, and the proportion of dispersant was 5wt%. The binder ratio is 5wt%, the deionized water ratio is 26wt%, and the defoamer ratio is 4%. The dispersant is polyethyleneimine, and the binder is gelatin. (3) Add the prepared ceramic slurry into the barrel of the 3D printer, extrude the ceramic slurry into a filamentary unit under the control of the printing pro...

Embodiment 3

[0040] like Figure 7-9 Shown, a kind of preparation method of 3D printing monolithic silicon carbide heat shield comprises the following steps:

[0041] (1) slice and layer the model of the designed heat shield, determine the printing program according to the structure, and import the program into the 3D printing equipment program; (2) combine silicon carbide powder, dispersant, binder, Ionized water is mixed evenly and ball milled for 1-24 hours, and then the ball-milled slurry is subjected to vacuum defoaming in a vacuum defoaming machine for 60 minutes to obtain a ceramic slurry; the proportion of silicon carbide ceramic powder is 12wt%, and the proportion of dispersant is 10wt %, the binder ratio is 20wt%, the deionized water ratio is 50wt%, and the defoamer ratio is 8%. The dispersant is sodium tripolyphosphate, and the binder is dextrin. (3) Add the prepared ceramic slurry into the barrel of the 3D printer, extrude the ceramic slurry into a filamentary unit under the ...

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Abstract

The invention discloses a method for preparing a 3D printing integrated silicon carbide heat shield. The prepared ceramic slurry is added to the barrel of a 3D printer, and the ceramic slurry is extruded into a filamentary unit body, which is piled up layer by layer and formed. Obtain an integral heat shield ceramic green body; the first layer is an inner layer, and the inner layer is an integral structural layer with a thickness of 5-15mm, and its inner wall is the main reflective surface; the second layer is initially an auxiliary reflective layer, and the auxiliary reflective layer The reflective layer and the thermal insulation layer have convective slots that create turbulent flow. The 3D printed integral silicon carbide heat shield prepared by this method; the heat shield that can be printed has a regular overall structure, the polished inner surface forms a reflective surface, and is subjected to high-temperature desiliconization treatment to remove high-temperature sintering pollution such as silicon vapor; The high temperature chemical stability is good, and the atmosphere in the furnace has a three-dimensional network outer layer with low thermal conductivity, the stability of the printing structure, the heat shield has a precise process installation position, and better controllability.

Description

technical field [0001] The invention relates to the technical field of high temperature resistance furnaces, in particular to a preparation method of a 3D printed integral silicon carbide heat shield. Background technique [0002] High temperature resistance furnace refers to the equipment that uses resistance heating to perform sintering, heating, melting, heat treatment and other processes in vacuum or inert gas atmosphere. It is widely used in inorganic materials, ceramic materials, functional materials, cemented carbide, high melting point In the sintering and research experiments of high temperature materials such as oxides and high temperature metals. [0003] The main function of the heat shield of the high temperature resistance furnace is to heat insulation and heat preservation, reduce the heat loss in the furnace, and make the heating zone inside the furnace body and the workpiece in the furnace reach and maintain a certain required temperature. The function of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622C04B41/91B28B1/00B33Y10/00F27D1/00
CPCC04B35/565C04B35/622C04B41/91C04B41/53B28B1/001B33Y10/00F27D1/0033C04B2235/428C04B2235/616C04B2235/656C04B2235/9607
Inventor 邬国平于明亮熊礼俊程雨浩程海林沈赟杨连江谢方民
Owner NINGBO VULCAN TECH CO LTD
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