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Preparation method of corundum-mullite complex phase ceramic material

A technology of composite ceramics and mullite, which is applied in the field of preparation of corundum-mullite composite ceramic materials, can solve the problems of high raw material source cost, high energy consumption, and limited application, so as to improve resource utilization and reduce Effects on production energy consumption and costs

Inactive Publication Date: 2014-05-07
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some methods require the use of chemically synthesized raw materials, or require a high content of alumina in bauxite and fly ash. Such raw materials have fewer sources and higher costs, which limits their application in actual production and also reduces Comprehensive utilization of resources
In addition, the existing methods for preparing such composite materials usually require the synthesis of ceramic materials first and then high-temperature sintering to make products of a certain shape and size. The process is complicated, the product quality is unstable, and the energy consumption is high.

Method used

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  • Preparation method of corundum-mullite complex phase ceramic material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A method for preparing a corundum-mullite composite ceramic material, comprising the steps of:

[0023] 1) According to the mass fraction, 15.3% of fly ash, 2.9% of calcium oxide and 81.8% of bauxite were evenly mixed to obtain raw materials, wherein the bauxite was bauxite with a content of 65% aluminum oxide Soil, the calcium oxide is obtained by thermal decomposition of calcium carbonate at 800-1000°C;

[0024] 2) Put the raw materials in a ball mill, add corundum balls according to the mass ratio of raw materials and corundum balls at 1:1, and after ball milling for 2 hours, pass through a 200-mesh standard sieve to obtain a mixed powder with a particle size of less than 74 μm;

[0025] 3) Add water glass accounting for 2% of its mass to the mixed powder, stir for 30 minutes, stale for 1 hour, then put it into a mold of a press, shape it under a pressure of 10MPa, and obtain a blank after demoulding;

[0026] 4) The billet is heated in a muffle furnace at a rate of...

Embodiment 2

[0030] A method for preparing a corundum-mullite composite ceramic material, comprising the steps of:

[0031] 1) According to the mass fraction, mix 5% fly ash, 7% albite and 88% bauxite evenly to obtain raw materials, wherein the bauxite is aluminum oxide with a content of 68% bauxite earth;

[0032] 2) Put the raw materials in a ball mill, add corundum balls according to the mass ratio of raw materials and corundum balls at 1:1, and after ball milling for 3 hours, pass through a 200-mesh standard sieve to obtain a mixed powder with a particle size of less than 74 μm;

[0033] 3) Add water glass accounting for 1.5% of its mass to the mixed powder, stir for 30 minutes, stale for 1 hour, then put it into a mold of a press, form it under a pressure of 10 MPa, and obtain a blank after demoulding;

[0034] 4) The billet is heated in a muffle furnace at a rate of 5 °C / min to 600 °C, and then at a rate of 15 °C / min to 1400 °C, kept for 1 hour and then cooled with the furnace to ob...

Embodiment 3

[0038] A method for preparing a corundum-mullite composite ceramic material, comprising the steps of:

[0039] 1) According to the mass fraction, 8.2% of fly ash, 2.9% of calcium oxide powder and 88.9% of bauxite are evenly mixed to obtain raw materials, wherein the bauxite is aluminum oxide with a content of 55% aluminum Alumina, the calcium oxide is obtained by thermal decomposition of calcite at 900-1200°C;

[0040] 2) Put the raw materials in a ball mill, add corundum balls according to the mass ratio of raw materials and corundum balls at 1:1, and after ball milling for 2.5 hours, pass through a 200-mesh standard sieve to obtain a mixed powder with a particle size of less than 74 μm;

[0041] 3) Add water glass accounting for 3% of its mass to the mixed powder, stir for 30 minutes, stale for 1 hour, then put it into a mold of a press, shape it under a pressure of 10 MPa, and obtain a blank after demoulding;

[0042] 4) The billet is heated in a muffle furnace at a rate o...

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Abstract

The invention discloses a preparation method of a corundum-mullite complex phase ceramic material. The preparation method comprises the following steps: 1) uniformly mixing 1-25% by weight of coal ash, 0-5% by weight of calcium oxide, 0-10% by weight of albite and 60-99% by weight of bauxite to obtain a raw material, wherein the content of aluminum oxide in bauxite is 50-68% by weight; 2) uniformly mixing the raw materials in a ball mill and carrying out ball milling till the grain size of the raw material is less than 74 mu m to obtain mixed powder; 3) adding 1-3% by weight of water glass into the mixed powder to be uniformly stirred, aging for 1-2 hours, and forming and preforming on a press or a pelletizer to obtain a blank; and 4) heating the blank to 1350-1420 DEG C at a rate of 5-15 DEG C / min, insulating for 40-120 minutes and furnace cooling to obtain the corundum-mullite complex phase ceramic material. The bauxite used in the preparation method is a lower grade raw material, so that the production energy consumption and cost are lowered and the resource utilization rate is improved while the demand on the operational performance of the material is satisfied.

Description

technical field [0001] The invention relates to a ceramic material, in particular to a method for preparing a corundum-mullite composite ceramic material. Background technique [0002] Corundum is α-Al 2 o 3 is al 2 o 3 High-temperature structural phase with a density of 3.98g / cm 3 , is an orthorhombic crystal, has excellent physical and chemical properties such as high hardness, high melting point, high strength, acid and alkali corrosion resistance, etc. It is an important engineering ceramic material with a wide range of applications. Mullite is Al 2 o 3 -SiO 2 The only binary compound that exists stably under normal pressure in the binary system is an orthorhombic crystal, and its chemical formula is 3Al 2 o 3 -2SiO2 2 , Density 3.16, performance equivalent to corundum ceramics, high temperature mechanics and heat are particularly prominent, is an excellent high temperature structural material. [0003] Since the mullite crystal is generally columnar or prisma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 吴赟何志勇石飞飞李洪俊刘河牛增前党伟徐瑞国李伟蒙传幼
Owner CNPC BOHAI DRILLING ENG
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