A method for in-situ preparation of ceramic/carbon composites from hot-pressed organoclay

A carbon composite material, in-situ preparation technology, applied in clay products, other household utensils, household utensils, etc., can solve the problems of uneven dispersion of solid phase reinforcement and complicated sintering process, and achieve low cost, simple process, The effect of improving the strength of ceramics

Active Publication Date: 2017-06-06
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersion of solid phase reinforcement in the ceramic matrix is ​​not uniform, and the sintering process is complicated, so there are few reports on the in situ preparation of ceramic / carbon composites by hot pressing organoclays.

Method used

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  • A method for in-situ preparation of ceramic/carbon composites from hot-pressed organoclay
  • A method for in-situ preparation of ceramic/carbon composites from hot-pressed organoclay

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1 (HP-PG-ace-30)

[0023] In this example, attapulgite clay is used as raw material, and ceramic / carbon composite materials are prepared according to the following steps:

[0024] a1, pulverizing the attapulgite clay and passing through a 200-mesh sieve to obtain attapulgite powder;

[0025] a2. Prepare 240ml of acetamide solution with a mass fraction of 30wt.%. Weigh 12g of attapulgite powder and place it in the acetamide solution. After electric stirring and mixing at room temperature for 80 hours, centrifuge and dry at 60°C for 12 hours to obtain acetamide-modified Attapulgite powder;

[0026] a3. After grinding the acetamide-modified attapulgite powder obtained in step a2 and passing through a 200-mesh sieve, weigh 7g and place it in a graphite mold, and put it into a hot-press furnace together; , raise the temperature from room temperature to 300°C over 1 hour; then under 18MPa pressure, raise the temperature from 300°C to 700°C over 1 hour, then continue...

Embodiment 2

[0029] Example 2 (HP-PG-ace-15)

[0030] In this example, a ceramic / carbon composite material was prepared in the same manner as in Example 1, except that the mass fraction of acetamide solution in step a2 was 15 wt.%. The obtained attapulgite-based ceramic / carbon composite was named HP-PG-ace-15.

[0031] Through the three-point bending test, the bending strength of the attapulgite-based ceramic / carbon composite material is 100 MPa, and the elastic modulus is 63 GPa. The density measured by the Archimedes drainage method is 2.44g / cm 3 , the porosity is 8.86%.

Embodiment 3

[0032] Example 3 (HP-MMT-OTAC-0.1)

[0033] In this embodiment, montmorillonite clay is used as raw material, and the ceramic / carbon composite material is prepared according to the following steps:

[0034] b1, pulverizing the montmorillonite clay and passing through a 200-mesh sieve to obtain montmorillonite powder;

[0035] b2. Weigh 12g of montmorillonite powder and add it to a beaker filled with 240mL of distilled water in advance, mix well to form a uniform suspension, and add 0.1g of octadecyltrimethylammonium chloride (OTAC ), stirred electrically for 2 hours in a constant temperature water bath at 80°C, centrifuged, and dried at 60°C for 12 hours to obtain alkylammonium modified montmorillonite powder;

[0036] b3, after grinding the alkylammonium modified montmorillonite powder obtained in step b2 and passing through a 200 mesh sieve, weigh 7g and place it in a graphite mold for hot pressing, and put it into a hot pressing furnace together; under the protection of Ar...

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Abstract

The invention discloses an in-situ preparation method of a ceramic / carbon composite material by organic clay hot-pressing. According to the invention, cheap natural attapulgite clay and montmorillonite clay are used as raw materials and undergo organic modification by the use of different organic matters, and the ceramic / carbon composite material is prepared by an in-situ hot-pressing reaction-sintering process. After attapulgite surface undergoes organic modification by the use of micromolecular acetamide, hot-pressing is carried out at 1000 DEG C to obtain the attapulgite-based ceramic / carbon composite material; and after intercalation modification is carried out on montmorillonite by the use of long-chain alkyl ammonium, hot-pressing is carried out at 1000 DEG C to obtain the montmorillonite-based ceramic / carbon composite material. According to the invention, low-cost industrial-grade raw materials are used, and the prepared clay-based ceramic / carbon composite material has more excellent mechanical properties than traditional silicate ceramic prepared from hot-pressed clay. In addition, the in-situ reactive hot-pressing technology can reduce sintering temperature and enhance material compactness. The technology is simple, and parameters are easy to control.

Description

technical field [0001] The invention relates to a method for preparing a ceramic / carbon composite material, in particular to a method for preparing a ceramic / carbon composite material in situ by hot-pressing organic clay. Background technique [0002] Clay is generally formed by the weathering of aluminosilicate minerals on the earth's surface. It is composed of various hydrated silicates and a certain amount of alumina, alkali metal oxides and alkaline earth metal oxides, and contains impurities such as quartz, feldspar, and mica. , is an important mineral raw material. my country is rich in clay types and clay resources. Clay ceramics are a class of ceramic materials mostly made of silicate clay minerals. They are cheap and widely used in daily-use ceramics. However, clay ceramics largely affect the reliability and consistency of material properties due to their poor toughness. In recent years, researchers have focused on ceramic matrix composites, hoping to solve the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/13
Inventor 吴雪平张良吴玉程张先龙
Owner HEFEI UNIV OF TECH
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