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Preparation method of waste continuous silicon carbide fiber reinforced silicate ceramic

A technology of silicon carbide fiber and silicate, which is applied in the field of ceramic materials, can solve the problems of inapplicability, unreported glazing, water absorption, etc., and achieve the goal of reducing loss, ensuring the effect of strengthening and toughening, and alleviating the decomposition behavior of SiCxOy Effect

Active Publication Date: 2022-02-25
福建立亚新材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent uses low temperature sintering aid H 3 BO 3 And the use of a large amount of low-temperature raw materials such as albite feldspar reduces the firing temperature of ceramic matrix composites to 950°C, and the entire firing cycle is about 6 hours, but parameters such as glazing and water absorption are not reported.
However, in daily-use ceramics and architectural ceramics, some large-scale, thick-walled and glazed ceramics have mandatory requirements on glaze roughness, water absorption and other properties, so this invention patent is not applicable to these types of ceramics products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method for waste continuous silicon carbide fiber reinforced silicate ceramics, comprising the following steps:

[0039] Step 1: Prepare chopped silicon carbide fiber waste, including:

[0040] Step 1, using waste continuous silicon carbide fiber as raw material, heat preservation at 500°C for 1.5h for desizing treatment, to obtain waste continuous silicon carbide fiber after desizing;

[0041] Step 2, with superfine silicon dioxide, B 2 o 3 , polyacrylic acid, silica sol and water are mixed as raw materials, and are evenly stirred by ball milling in a horizontal ball mill to obtain a coating slurry with a solid content of 50%;

[0042] In step 2, B 2 o 3 The consumption of polyacrylic acid is 0.8% of the quality consumption of superfine silicon dioxide, the consumption of polyacrylic acid is 0.05% of the quality consumption of superfine silicon dioxide, and the consumption of silica sol is 3.5% of the quality consumption of superfine silicon dioxide; ...

Embodiment 2

[0057] A preparation method for waste continuous silicon carbide fiber reinforced silicate ceramics, comprising the following steps:

[0058] Step 1: Prepare chopped silicon carbide fiber waste, including:

[0059] Step 1, using waste continuous silicon carbide fiber as raw material, heat preservation at 500°C for 1.5h for desizing treatment, to obtain waste continuous silicon carbide fiber after desizing;

[0060] Step 2, with superfine silicon dioxide, B 2 o 3 , polyacrylic acid, silica sol and water are mixed as raw materials, and are evenly stirred by ball milling in a horizontal ball mill to obtain a coating slurry with a solid content of 50%;

[0061] In step 2, B 2 o 3 The consumption of polyacrylic acid is 1.0% of the quality consumption of superfine silicon dioxide, the consumption of polyacrylic acid is 0.05% of the quality consumption of superfine silicon dioxide, and the consumption of silica sol is 3.5% of the quality consumption of superfine silicon dioxide; ...

Embodiment 3

[0076] A preparation method for waste continuous silicon carbide fiber reinforced silicate ceramics, comprising the following steps:

[0077] Step 1: Prepare chopped silicon carbide fiber waste, including:

[0078] Step 1, using waste continuous silicon carbide fibers as raw materials, heat preservation at 600°C for 0.5h for desizing treatment, to obtain waste continuous silicon carbide fibers after desizing;

[0079] Step 2, with ultrafine mullite, ultrafine silica, B 2 o 3 , polyacrylic acid, silica sol and water are mixed as raw materials, and the ball mill is used to mix evenly with a horizontal ball mill to obtain a coating slurry with a solid content of 60%;

[0080]In step 2, take ultrafine mullite and ultrafine silicon dioxide as wrapping material, the mass ratio of ultrafine mullite and ultrafine silicon dioxide is 3:1, B 2 o 3 The consumption of polyacrylic acid is 0.2% of the amount of wrapping material, the amount of polyacrylic acid is 0.1% of the amount of wr...

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Abstract

The invention discloses a preparation method of waste continuous silicon carbide fiber reinforced silicate ceramic, which comprises the following steps: firstly, taking waste continuous silicon carbide fiber as a raw material to obtain chopped silicon carbide fiber waste silk of which the surface is coated with a fiber protective layer; preparing a basic formula of a ceramic body, mixing the basic formula with the chopped silicon carbide fiber waste silk to obtain ceramic body slurry, and performing slip casting, glazing and final sintering to prepare the waste continuous silicon carbide fiber reinforced silicate ceramic. In the preparation process, the reinforcing and toughening effects of the waste continuous silicon carbide fibers are remarkable, the glaze surface of the prepared waste continuous silicon carbide fiber reinforced silicate ceramic is smooth and free of obvious air holes, the water absorption rate is smaller than 2.2%, and the bending strength of a green body is larger than 123 MPa.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a method for preparing waste continuous silicon carbide fiber reinforced silicate ceramics. Background technique [0002] Silicon carbide (SiC) fiber is a ceramic fiber composed of equal amounts of carbon and silicon arranged periodically in a diamond structure. The actual silicon carbide fiber may contain carbon and oxygen elements. Silicon carbide fiber has the advantages of small diameter, high strength, high modulus, good temperature resistance, low density and stable chemical properties. Silicon carbide can withstand high temperatures above 1000°C in the air environment without chemical reactions, and has good mechanical properties and stability. It is widely used in aero engines, near-space vehicles, reusable spacecraft, nuclear energy, etc., and has broad development. Space and market outlook. [0003] Continuous silicon carbide fibers refer to fibers whose fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/622C04B35/16C04B35/628C04B35/626C04B35/64C04B41/86
CPCC04B35/80C04B35/62204C04B35/62605C04B35/16C04B35/62849C04B35/62852C04B35/62886C04B35/64C04B41/86C04B41/5022C04B41/009C04B2235/3418C04B2235/3217C04B2235/3208C04B2235/3206C04B2235/3201C04B2235/3427C04B2235/6562C04B2235/6567C04B2235/5244C04B2235/96C04B41/0072Y02P40/60
Inventor 崔冰峡黄祥贤陈培阳蔡武集出腾龙汪涵黄伟斌江元强朱家明
Owner 福建立亚新材有限公司
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