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Method for preparing cordierite ceramics from desert aeolian sand

A desert aeolian sand and cordierite technology, applied in the field of ceramic manufacturing, can solve the problems of narrow sintering temperature range, increase of ceramic thermal expansion coefficient, difficulty in converting cordierite, etc.

Active Publication Date: 2014-04-30
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sintering temperature range of cordierite ceramics is very narrow, and it is relatively difficult to convert from quartz, alumina and magnesia to cordierite phase, and it is necessary to add an appropriate amount of sintering aids to promote the phase transition process, reduce the sintering temperature and holding time, and improve the ceramic Density and strength, but to a certain extent increases the thermal expansion coefficient of ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Using desert aeolian sand, alumina, and magnesia as raw materials, powder is made by wet ball milling, and SiO in the mixed powder is 2 、Al 2 o 3 The contents of MgO and MgO were 48%, 32% and 15%, respectively, and the mixed powder was granulated and shaped under a pressure of 20MPa. The formed blank was sintered at 1400°C for 6 hours. The content of the cordierite phase in the synthesized ceramics is 95%, the density is 80%, the bending strength is 30MPa, and the thermal expansion coefficient is 1.8×10 -6 / °C.

Embodiment 2

[0014] Example 2: Using desert aeolian sand, alumina, magnesia, and cerium oxide as raw materials, powder is made by wet ball milling, and SiO in the mixed powder is 2 、Al 2 o 3 The contents of MgO and MgO are 50%, 30% and 10% respectively, and the amount of cerium oxide added is 6%. The mixed powder was granulated and shaped under a pressure of 20 MPa. The formed blank was sintered at 1250°C for 5 hours. The content of the cordierite phase in the synthesized ceramics is 85%, the density is 80%, the bending strength is 25MPa, and the thermal expansion coefficient is 3.2×10 -6 / °C.

Embodiment 3

[0015] Example 3: Using desert aeolian sand, alumina, magnesia, and cerium oxide as raw materials, powdering by wet ball milling, and SiO in the mixed powder 2 、Al 2 o 3 The contents of MgO and MgO are 48%, 32% and 13% respectively, and the addition amount of cerium oxide is 4%. The mixed powder was granulated and shaped under a pressure of 50 MPa. The formed blank was sintered at 1420°C for 4 hours. The cordierite phase content in the synthesized ceramics was 90%, the density was 92%, the bending strength was 40MPa, and the thermal expansion coefficient was 2.2×10 -6 / °C.

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Abstract

The invention discloses a method for preparing cordierite ceramics from desert aeolian sand. According to the method, desert aeolian sand, aluminum oxide, magnesium oxide and cerium oxide are used as raw materials, the raw materials are prepared into powder by wet ball milling, SiO2, Al2O3 and MgO in the mixed powder respectively account for 48-53%, 30-37% and 10-15%, additive amount of the cerium oxide is at most 6%, the mixed powder is granulated and molded under high pressure; the molded blank is sintered for 3-6 hours at high temperature, and then, the cordierite ceramics is obtained. The density of the ceramics synthesized by the method can be 80-95%, bending strength of the ceramics can be 25-45MPa, and coefficient of thermal expansion of the ceramics can be (1.8-3.2)*10<-6> / DEG C.

Description

technical field [0001] The invention belongs to the field of ceramic manufacturing, and in particular relates to a method for preparing cordierite ceramics by utilizing desert aeolian sand. Background technique [0002] Cordierite ceramics (2MgO 2Al 2 o 3 ·5SiO2 2 ) has a low coefficient of thermal expansion, and is widely used in refractory and thermal insulation materials used in high-temperature environments in metallurgy, machinery, chemicals, and electric power industries. In order to maintain the low thermal expansion coefficient of the ceramic, the conventional processing method is to use high-purity quartz, alumina and magnesia as raw materials, and the ceramic has a single cordierite phase after high-temperature synthesis. However, the sintering temperature range of cordierite ceramics is very narrow, and it is relatively difficult to convert from quartz, alumina, and magnesia to cordierite phase, and it is necessary to add an appropriate amount of sintering aids...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/195C04B35/622
Inventor 史志铭王文彬范文
Owner INNER MONGOLIA UNIV OF TECH
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