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Method for preparing zirconium oxide/mullite crystal whisker multiple phase material

A mullite whisker and zirconia technology, which is applied in the field of preparing zirconia/mullite whisker composite materials, can solve the problems of polluted waste liquid and waste residue, high cost of raw materials, complicated process, etc., and reduce high-temperature airtightness Environmental requirements, reduced raw material costs, and simple preparation methods

Active Publication Date: 2008-02-13
PUYANG REFRACTORIES GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because this method uses a large number of chemical products as raw materials, the cost of raw materials is relatively high; in addition, the above-mentioned preparation method needs to repeatedly wash and filter the product, so the process is relatively complicated, and waste that pollutes the environment will also be produced during the washing process. liquid and waste residue; the preparation process should be carried out in a high-temperature closed environment, otherwise in the reaction process, the gas (such as SO 2 ) will cause environmental pollution, and this also causes great difficulties to its industrialized production
Most importantly, this method can only obtain agglomerated powder, but cannot directly obtain zirconia / mullite whisker composite materials reinforced in situ with mullite whiskers

Method used

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  • Method for preparing zirconium oxide/mullite crystal whisker multiple phase material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Select the chemical composition as: Al 2 o 3 70wt%, SiO 2 12wt%, Fe 2 o 3 1.5wt%, TiO 2 4wt%, CaO 0.5wt%, MgO 0.2wt%, K 2 O+Na 2 The bauxite of O 1wt%, LOI (loss on ignition) 10.8wt%, and chemical composition is: ZrO 2 65wt%, SiO 2 33wt%, Fe 2 o 3 0.05wt%, Al 2 o 3 0.5wt%, TiO 2 0.2wt%, CaO 0.05wt%, MgO 0.05wt%, Na 2 O+K 2 O0.03wt%, zircon of 0.12wt% loss on ignition; the above-mentioned bauxite and zircon are crushed to a powder with an average particle size of 20 μm. Weigh 1000g of the above crushed bauxite and 471.01g of zircon, put the above raw materials into the ball mill tank of the planetary ball mill for co-grinding for 5 hours, the ball-to-material ratio is 60:1, and the speed is 1000 rpm. The above mixed powder after co-grinding is machine pressed into a block green body under a pressure of 30 MPa. Then put the above block green body in a box-type resistance furnace for heat treatment, the heating rate is 10°C / min, the heat treatment ...

Embodiment 2

[0021] Select the chemical composition as: Al 2 o 3 75wt%, SiO 2 8wt%, Fe 2 o 3 1wt%, TiO 2 3wt%, CaO 0.5wt%, MgO 0.2wt%, K 2 O+Na 2 The bauxite of O 1wt%, LOI (loss on ignition) 11.3wt%, and chemical composition is: ZrO 2 68wt%, SiO 2 30wt%, Fe 2 o 3 0.15wt%, Al 2 o 3 1wt%, TiO 2 0.4wt%, CaO 0.05wt%, MgO 0.05wt%, Na 2 O+K 2 O 0.03wt%, zircon with an ignition loss of 0.32wt%; the above-mentioned bauxite and zircon are crushed to a powder with an average particle size of 25 μm. Weigh 1000g of the crushed bauxite and 723.18g of zircon, and put the above raw materials into the ball mill tank of the planetary ball mill for co-milling for 10 hours, the ball-to-material ratio is 40:1, and the speed is 900 rpm. The above-mentioned mixed powder after co-grinding is machine-pressed into a block green body under a pressure of 40 MPa. Then, the above block green body was placed in a box-type resistance furnace for heat treatment, the heating rate was 10°C / min, th...

Embodiment 3

[0023] Select the chemical composition as: Al 2 o 3 80wt%, SiO 2 3wt%, Fe 2 o 3 1wt%, TiO 2 3wt%, CaO 0.5wt%, MgO 0.2wt%, K 2 O+Na 2 The bauxite of O 1wt%, LOI (loss on ignition) 11.3wt%, and chemical composition is: ZrO 2 67wt%, SiO 2 31wt%, Fe 2 o 3 0.1wt%, Al 2 o 3 1wt%, TiO 2 0.4wt%, CaO 0.05wt%, MgO 0.05wt%, Na 2 O+K 2 O 0.03wt%, zircon with an ignition loss of 0.37wt%; the above-mentioned bauxite and zircon are crushed to a powder with an average particle size of 30 μm. Weigh 1000 g of the crushed bauxite and 926.97 g of zircon, put the above raw materials into the ball mill tank of the planetary ball mill for co-grinding for 15 hours, the ball-to-material ratio is 30:1, and the speed is 700 rpm. The above-mentioned mixed powder after co-grinding is machine-pressed into a block green body under a pressure of 50 MPa. Then put the above block green body in a box-type resistance furnace for heat treatment, the heating rate is 15°C / min, the heat treat...

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Abstract

A method for preparing a zirconia / mullite whisker composite material by crushing, batching, co-grinding with high-energy ball milling, compacting and heat treatment using natural bauxite and zircon minerals as raw materials; the method prepares In the composite material structure, the average diameter of the mullite whiskers is 1.5-3 μm, the aspect ratio is 8-10, and the zirconia is evenly distributed in the network structure formed by the mullite whiskers in an irregular granular shape. The invention fully utilizes the chemical and mineral composition characteristics of natural bauxite and zircon minerals, and has the characteristics of low raw material cost, simple preparation process and environmental friendliness.

Description

technical field [0001] The invention relates to a method for preparing a zirconia / mullite whisker composite material by using natural bauxite and zircon minerals as raw materials. Background technique [0002] As we all know, mullite has the characteristics of anisotropic growth. Under appropriate conditions, it can grow into well-developed whiskers. Mullite whiskers have high temperature resistance, oxidation resistance, low thermal expansion, good high temperature mechanical properties, and chemical properties. A series of excellent properties such as stability can play a significant role in toughening and strengthening. Adding zirconia to the mullite phase, and using appropriate technology to control the growth process of zirconia and mullite phase, a zirconia / mullite composite material with a unique microstructure will be obtained, that is, zirconia / mullite Come stone whisker composite material. The mullite whiskers generated in situ in the material form a network stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 张厚兴贺中央吕雪燕
Owner PUYANG REFRACTORIES GRP CO LTD
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