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Pressureless sintering method for silicon carbide sagger and application of sagger

A silicon carbide box and silicon carbide technology, applied in the field of saggers, can solve the problems of large porosity and low density, and achieve the effects of low density, long service life and large porosity

Inactive Publication Date: 2019-11-15
湖南太子新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to provide a method of pressureless sintering silicon carbide sagger and its application, which solves the problems of low density and large porosity under normal pressure sintering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for pressureless sintering silicon carbide sagger, the method for pressureless sintering is:

[0018] Step 1. Mix silicon carbide, epoxy resin, bentonite and diatomaceous earth and add absolute ethanol to dissolve to obtain slurry A. Mix lithium silicate and sodium silicate and add distilled water to dissolve to obtain solution B. A and solution B are mixed and then stirred to obtain slurry C;

[0019] Step 2, drying, granulating and aging the slurry C to obtain powder D;

[0020] Step 3: Mix the powder D and the sintering aid, pressurize and form a wet billet of the desired shape, and obtain a green billet after drying. The pressurization adopts three-stage press molding, and the first stage pressurizes The conditions of the pressure at least include: the pressure is 35MPa, the pressure holding time is 35s; the conditions of the second stage of pressurization include at least: the pressure of 85MPa, the pressure holding time is 8s; the conditions of the third...

Embodiment 2

[0025] A method for pressureless sintering silicon carbide sagger, the method for pressureless sintering is:

[0026] Step 1. Mix silicon carbide, epoxy resin, bentonite and diatomaceous earth and add absolute ethanol to dissolve to obtain slurry A. Mix lithium silicate and sodium silicate and add distilled water to dissolve to obtain solution B. A and solution B are mixed and then stirred to obtain slurry C;

[0027] Step 2, drying, granulating and aging the slurry C to obtain powder D;

[0028] Step 3: Mix the powder D and the sintering aid, pressurize and form a wet billet of the desired shape, and obtain a green billet after drying. The pressurization adopts three-stage press molding, and the first stage pressurizes The conditions of the pressure at least include: the pressure is 38MPa, the pressure holding time is 38s; the conditions of the second stage of pressurization include at least: the pressure of 90MPa, the pressure holding time is 9s; the conditions of the third...

Embodiment 3

[0033] A method for pressureless sintering silicon carbide sagger, the method for pressureless sintering is:

[0034] Step 1. Mix silicon carbide, epoxy resin, bentonite and diatomaceous earth and add absolute ethanol to dissolve to obtain slurry A. Mix lithium silicate and sodium silicate and add distilled water to dissolve to obtain solution B. A and solution B are mixed and then stirred to obtain slurry C;

[0035] Step 2, drying, granulating and aging the slurry C to obtain powder D;

[0036] Step 3: Mix the powder D and the sintering aid, pressurize and form a wet billet of the desired shape, and obtain a green billet after drying. The pressurization adopts three-stage press molding, and the first stage pressurizes The conditions of the pressure at least include: the pressure is 40MPa, the pressure holding time is 38s; the conditions of the second stage of pressurization include at least: the pressure of 100MPa, the pressure holding time is 10s; the conditions of the thi...

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PUM

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Abstract

The invention discloses a pressureless sintering method for a silicon carbide sagger. The pressureless sintering method comprises the following steps: step 1, mixing silicon carbide, epoxy resin, bentonite and diatomaceous earth, and adding anhydrous ethanol to dissolve the mixture to obtain slurry A, mixing lithium silicate and sodium silicate, adding distilled water to dissolve the mixture to obtain a solution B, mixing the slurry A and the solution B, and performing stirring to obtain slurry C; step 2, drying the slurry C, performing granulation, and performing aging to obtain powder D; step 3, mixing the powder D and a sintering auxiliary agent, performing pressing forming to form a wet blank of a desired shape, and performing drying to obtain a green body; and step 4, placing the dried green body in a sintering furnace, and performing sintering to obtain the sagger. According to the pressureless sintering method provided by the invention, the sagger prepared by adopting the pressureless sintering method has a long service life, solves the problems of a small density and large porosity of pressureless sintering, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of saggers, in particular to a method for pressureless sintering silicon carbide saggers and its application. Background technique [0002] With the development of science and technology, especially the high development of energy and space technology, it is often required that materials must have superior properties such as high temperature resistance, corrosion resistance, and wear resistance before they can be used in harsh working environments. As one of the few candidate materials suitable for high-temperature structural calcination, silicon carbide material shows its unique advantages in harsh environments such as high temperature, thermal shock, and corrosion. Its high-temperature performance and application potential have long attracted people's attention, but its characteristics make it difficult to sinter and compact under normal pressure. The prepared silicon carbide ceramics have low density and high porosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/66F27D5/00
CPCC04B35/565C04B35/66C04B2235/3418C04B2235/3427C04B2235/349C04B2235/668F27D5/0012
Inventor 刘骏刘振华张海
Owner 湖南太子新材料科技有限公司