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Si-Al-O-C ceramic material and preparation method thereof

A technology of ceramic materials and elements, applied in the field of high temperature resistant ceramic materials and their preparation, can solve the problems of unsuitable operating temperature conditions, loss of functional properties, decline in mechanical properties, etc., and achieves low equipment requirements, less mass loss, and thermal good stability

Inactive Publication Date: 2010-10-13
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in an environment with a temperature higher than 1200 °C, SiOC ceramic materials will undergo obvious structural instability and carbothermal reduction reactions, resulting in significant weight loss, resulting in a decrease in their mechanical properties or loss of functional properties, which cannot be applied to higher and higher temperatures. Requirements for operating temperature conditions

Method used

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  • Si-Al-O-C ceramic material and preparation method thereof
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  • Si-Al-O-C ceramic material and preparation method thereof

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Embodiment 1

[0029] The Si-Al-O-C ceramic material of this embodiment includes Si element, Al element, O element and C element, wherein, the mass fraction of Si element is 32%, the mass fraction of Al element is 14%, the mass fraction of O element is 24%, the mass fraction of C element is 30%, and its appearance is black. The Si-Al-O-C ceramic material is prepared through the following steps:

[0030] 1. Material preparation:

[0031] (1) At a constant temperature of 70°C, take aluminum chloride hexahydrate crystals (AlCl 3 ·6H 2 O) Dissolved in ethanol, wherein the content of aluminum is 10g / L, and an appropriate amount of urea is added thereto to obtain aluminum hydroxide precipitation, after washing with deionized water, it is ultrasonically peptized at a constant temperature at 80°C to prepare Aluminum hydroxide sol;

[0032] (2) preparing a mass concentration of 30% silicone resin ethanol solution containing Si-OH groups;

[0033] 2. Preparation of gel: Mix the prepared 30% silic...

Embodiment 2

[0038] The Si-Al-O-C ceramic material of this embodiment includes Si element, Al element, O element and C element, wherein, the mass fraction of Si element is 32%, the mass fraction of Al element is 14%, the mass fraction of O element is 24%, the mass fraction of C element is 30%, and its appearance is black. The Si-Al-O-C ceramic material is prepared through the following steps:

[0039] 1. Material preparation:

[0040] (1) Under constant temperature conditions of 70°C, aluminum sec-butoxide and deionized water are added to ethanol with a pH value of 3, and the volume ratio of aluminum sec-butoxide, deionized water and ethanol is 8:2:100, A light white transparent sol is formed, which is aluminum hydroxide sol;

[0041] (2) preparing a concentration of 30% silicone resin ethanol solution containing Si-OH groups;

[0042] 2. Preparation of gel: Mix the obtained 30% silicone resin ethanol solution and aluminum hydroxide sol according to the volume ratio of 1:5, and form a g...

Embodiment 3

[0047] The Si-Al-O-C ceramic material of this embodiment includes Si element, Al element, O element and C element, wherein, the mass fraction of Si element is 27%, the mass fraction of Al element is 28%, the mass fraction of O element is 20%, the mass fraction of C element is 25%, and its appearance is black. The Si-Al-O-C ceramic material is prepared through the following steps:

[0048] 1. Material preparation:

[0049] (1) Under constant temperature conditions of 70°C, aluminum sec-butoxide and deionized water are added to ethanol with a pH value of 3, and the volume ratio of aluminum sec-butoxide, deionized water and ethanol is 8:2:100, A light white transparent sol is formed, which is aluminum hydroxide sol;

[0050] (2) preparing a concentration of 15% silicone resin ethanol solution containing Si-OH groups;

[0051] 2. Preparation of gel: Mix the obtained 15% silicone resin ethanol solution and aluminum hydroxide sol according to the volume ratio of 1:5, and form a g...

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Abstract

The invention belongs to the field of high temperature resistant ceramic materials and preparation methods thereof and discloses an Si-Al-O-C ceramic material and a preparation method thereof. The Si-Al-O-C ceramic material contains the following elements in percentage by mass: 27-32 percent of Si element, 20-24 percent of O element, 25-30 percent of C element and 14-28 percent of Al element. The preparation method of the Si-Al-O-C ceramic material comprises the steps of aluminum sol preparation, gel preparation, precursor preparation, Si-Al-O-C ceramic material preparation and the like. The invention has the advantages of low cost, good heat stability, simple preparation process, low equipment requirements, and the like.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a high-temperature-resistant ceramic material and a preparation method thereof. Background technique [0002] The development and application of new materials is one of the main directions of scientific and technological development at present, and advanced ceramic materials are one of the important branches. Due to the special metastable structure of SiOC ceramic materials, its mechanical properties, high temperature stability, and chemical stability are significantly better than traditional SiO 2 materials; at the same time, SiOC ceramic materials can also have a variety of molecular structures or components, so that they have functional properties such as luminescence and dielectric properties, and can be used as lightweight high-temperature structural materials, optical materials, electronic packaging ceramic substrate materials, lithium-ion Battery electrode materials, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/624
Inventor 马青松徐天恒陈朝辉
Owner NAT UNIV OF DEFENSE TECH
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