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Corundum-mullite composite material and preparing method

A technology of composite materials and mullite, applied in the field of refractory materials, can solve the problems of increasing the production cost of materials

Inactive Publication Date: 2006-08-23
ZHONGYUAN WEIYE NEW MATERIAL
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, if it is synthesized with pure raw materials, the production cost of the material will be seriously increased, especially as a refractory material.

Method used

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  • Corundum-mullite composite material and preparing method
  • Corundum-mullite composite material and preparing method
  • Corundum-mullite composite material and preparing method

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] 1. Raw material selection

[0017] ①Chemical analysis results of bauxite

[0018]

[0019] ②Chemical analysis results of coal gangue

[0020]

[0021] 2. Raw material synthesis

[0022] Raw material ratios are: 5, 10, 20wt.% coal gangue and 95, 90, 80wt.% bauxite

[0023] 3. Synthetic steps: see figure 1

[0024] It is clear from the XRD diagram that a very pure corundum-mullite composite material was synthesized under this test condition.

[0025] From the analysis of SEM fracture morphology, it can be seen that the crystal morphology is a typical long columnar crystal, densely grown in an interlaced shape, and its length-to-diameter ratio is about 8:1 or even greater. The method is transgranular fracture, which can significantly improve the performance of the material in all aspects.

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Abstract

The present invention belongs to the field of refractory material field, and is especially one kind of composite corundum-mullite material. The composite corundum-mullite material is prepared with coal gangue in 5-25 wt% and bauxite in 75-95 wt%, with the bauxite containing Al2O3 over 75 wt%. The preparation process of the composite corundum-mullite material includes the following steps: ball milling the material in absolute ethyl alcohol as medium for 6 hr, maintaining in stoving for 12hr, pressing to form, and maintaining at 1350-1450deg.c for 3-6 hr in air atmosphere to synthesize. Test shows that the composite corundum-mullite material has high purity. Preparing composite corundum-mullite material with coal gangue and bauxite as main material has rich and cheap material source, so that the present invention provides one new way of preparing high temperature refractory material.

Description

technical field [0001] The invention belongs to the field of refractory materials, in particular to a corundum-mullite composite material. Background technique [0002] Because mullite has good high-temperature mechanical and high-temperature thermal properties, the synthetic mullite products have higher density and purity, lower thermal conductivity and thermal expansion coefficient, high-temperature structural strength, low high-temperature creep rate, and heat resistance. Strong shock and chemical erosion, high melting point; while corundum has good elasticity, high melting point, good wear resistance, chemical erosion resistance and volume stability at high temperature, high hardness, high refractoriness; in addition, mullite crystal It is generally columnar or prismatic, and the corundum body is generally granular, so the preparation of corundum-mullite composite materials will bring together the dual advantages of corundum crystals and mullite crystals, so that this ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/14C04B35/622
Inventor 张梅王习东董鹏莉王海娟李华军张歪牛
Owner ZHONGYUAN WEIYE NEW MATERIAL
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