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Low-cost SiZrOC ceramic material and preparation method thereof

A ceramic material, low-cost technology, applied in the field of high-temperature structural ceramics, can solve problems such as poor thermal stability, and achieve the effects of low price, simple preparation method and convenient operation

Active Publication Date: 2020-09-25
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a low-cost SiZrOC ceramic material and its preparation method in view of the poor thermal stability of SiOC ceramic materials in the prior art, which is a simple process, convenient operation and low cost. The preparation method of SiZrOC ceramics, the prepared SiZrOC ceramics have good high temperature resistance

Method used

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  • Low-cost SiZrOC ceramic material and preparation method thereof
  • Low-cost SiZrOC ceramic material and preparation method thereof
  • Low-cost SiZrOC ceramic material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] A preparation method of low-cost SiZrOC ceramic material, comprising the following steps:

[0026] 1) Preparation of zirconium sol:

[0027] Under constant temperature conditions of 40°C, take 4g ZrOCl 2 ·8H 2 O was dissolved in 20g ethanol, and magnetically stirred for 20min after adding 5g acetylacetone therein, to obtain zirconium sol;

[0028] Take 50g of MK silicone resin and dissolve it in 50g of ethanol to prepare a 50% MK silicone resin ethanol solution;

[0029] 2) Preparation of gel: Mix the prepared MK silicone resin ethanol solution and zirconium sol, add 2.7g of polyethylene glycol, and let it stand for 6 hours to form a gel;

[0030] 3) Preparing the precursor: heating the obtained gel to 150° C. in a drying oven, and drying for 10 hours to obtain a zirconium-modified polysiloxane precursor;

[0031] 4) Preparation of SiZrOC ceramic material: The obtained zirconium-modified polysiloxane precursor was placed in an inert gas atmosphere at 1000° C. for cr...

Embodiment 2

[0034] A preparation method of low-cost SiZrOC ceramic material, comprising the following steps:

[0035] 1) Preparation of zirconium sol:

[0036] Under constant temperature conditions of 50°C, take 10g ZrOCl 2 ·8H 2 O was dissolved in 35g of ethanol, and magnetically stirred for 15min after adding 6.2g of acetylacetone therein, to obtain a zirconium sol;

[0037] Take 30g of MK silicone resin and dissolve it in 70g of ethanol to prepare a 30% MK silicone resin ethanol solution;

[0038] 2) Gel preparation: the prepared MK silicone resin ethanol solution was mixed with zirconium sol, 4g of polyethylene glycol was added, and after standing for 9 hours, a gel was formed;

[0039] 3) Preparing the precursor: heating the obtained gel to 200° C. in air, and drying for 4 hours to obtain a zirconium-modified polysiloxane precursor;

[0040] 4) Preparation of SiZrOC ceramic material: The obtained zirconium-modified polysiloxane precursor was placed in a high-temperature inert gas...

Embodiment 3

[0043] A preparation method of low-cost SiZrOC ceramic material, comprising the following steps:

[0044] 1) Preparation of zirconium sol:

[0045]Under constant temperature conditions of 45°C, take 30g ZrOCl 2 ·8H 2 O was dissolved in 60g of ethanol, and magnetically stirred for 10min after adding 9.3g of acetylacetone therein to obtain a zirconium sol; 40g of MK silicone resin was dissolved in 60g of ethanol to prepare a 40% MK silicone resin ethanol solution;

[0046] 2) Gel preparation: the prepared MK silicone resin ethanol solution was mixed with zirconium sol, 12 g of polyethylene glycol was added thereto, and after standing for 28 hours, a gel was formed;

[0047] 3) Preparing the precursor: heating the obtained gel to 220° C. in air, and drying for 6 hours to obtain a zirconium-modified polysiloxane precursor;

[0048] 4) Preparation of SiZrOC ceramic material: The obtained zirconium-modified polysiloxane precursor was placed in a high-temperature inert gas atmosph...

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Abstract

The invention discloses a low-cost SiZrOC ceramic material and a preparation method thereof. Silicon resin with small molecular weight is used as a raw material. The preparation method comprises the following steps: introducing inorganic zircon salt by adopting a sol-gel method to form a Zr-containing PSO precursor; and then carrying out precursor crosslinking and high-temperature cracking to obtain the SiZrOC ceramic. According to the method, the silicon resin adopted in the process is methyl silicon resin and dissolved in ethyl alcohol, the inorganic zircon salt is zirconium oxychloride (ZrOCl<2>.8H<2>O) and dissolved in ethyl alcohol, a small amount of a chelating agent and a steric hindrance agent are added, mixing is carried out to prepare sol, and gel is formed after standing of thesol. The preparation method disclosed by the invention has the advantages of low cost, good high-temperature resistance, simple process, low equipment requirement and the like.

Description

technical field [0001] The invention belongs to the technical field of high-temperature structural ceramics, and in particular relates to a low-cost SiZrOC ceramic material and a preparation method thereof. Background technique [0002] Low-cost high-temperature ceramics and ceramic matrix composites have always been the focus and hot areas of aerospace thermal protection systems and propulsion systems. SiOC ceramics can be regarded as SiO 2 The product in which the oxygen atoms in the network are partially replaced by carbon atoms. Since more carbon atoms replace oxygen into SiO 4 In the structure, the mechanical properties, high temperature stability, and chemical stability of SiOC ceramics are significantly better than those of quartz ceramics; therefore, it is considered to be a good lightweight and high temperature resistant structural material. [0003] Organic polymer derived ceramics (Polymer Derived Ceramics, PDCs) technology has achieved a revolutionary breakthr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622
CPCC04B35/5603C04B35/622C04B2235/9607C04B2235/656C04B2235/6567C04B2235/658C04B2235/48C04B2235/483
Inventor 郭蕾马青松
Owner NAT UNIV OF DEFENSE TECH
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