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Rare earth perovskite type fire-resistant material

A refractory material and perovskite-type technology, applied in the field of refractory materials, can solve the problems of unclear high-temperature mechanical properties, large thermal expansion coefficient, poor thermal shock resistance, etc., and achieve optimized microstructure and stable high-temperature chemical properties , Improve the effect of thermal shock resistance

Inactive Publication Date: 2009-07-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But pure LaMO 3 Ceramic materials have a large coefficient of thermal expansion and low thermal conductivity, poor thermal shock resistance, high-temperature mechanical properties are not very clear, and cannot be directly used as refractory materials

Method used

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  • Rare earth perovskite type fire-resistant material
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  • Rare earth perovskite type fire-resistant material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Comprising the following components by weight percentage, LaCrO 3 75%, ZrO 2 25%.

[0018] LaCrO 3 The atomic structure is perovskite type.

[0019] In the present invention, the high temperature oxide ZrO 2 As the second phase, it is added to the rare earth oxide lanthanum chromate matrix at a certain mass percentage to prepare a composite material, and the performance of the refractory material is greatly improved by adding and sintering. The specific indicators are shown in Table 1.

[0020] The present invention detects ZrO through X-ray diffraction after high temperature sintering 2 There is no reaction with the matrix structure of lanthanum chromate, no new phase is formed, and the La 1-x Ca x CrO 3 structural composition. Such as figure 1 shown.

Embodiment 2

[0021] Embodiment 2: Embodiment 1: Comprising the composition of following percentage by weight, LaCrO 3 85%, ZrO 2 15%.

[0022] LaCrO 3 The atomic structure is perovskite type.

[0023] In the present invention, the high temperature oxide ZrO 2 As the second phase, it is added to the rare earth oxide lanthanum chromate matrix at a certain mass percentage to prepare a composite material, and the performance of the refractory material is greatly improved by adding and sintering. The specific indicators are shown in Table 1.

[0024] The present invention detects ZrO through X-ray diffraction after high temperature sintering 2 There is no reaction with the matrix structure of lanthanum chromate, no new phase is formed, and the La 1-x Ca x CrO 3 structural composition. Such as figure 1 shown.

Embodiment 3

[0025] Embodiment 3: Comprising the following components by weight percentage, LaCrO 3 90%, ZrO 2 10%.

[0026] LaCrO 3 The atomic structure is perovskite type.

[0027] In the present invention, the high temperature oxide ZrO 2 As the second phase, it is added to the rare earth oxide lanthanum chromate matrix at a certain mass percentage to prepare a composite material, and the performance of the refractory material is greatly improved by adding and sintering. The specific indicators are shown in Table 1.

[0028] The present invention detects ZrO through X-ray diffraction after high temperature sintering 2 There is no reaction with the matrix structure of lanthanum chromate, no new phase is formed, and the La 1-x Ca x CrO 3 structural composition. Such as figure 1 shown.

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Abstract

The invention relates to a rear-earth perovskite refractory material. The refractory material comprises the following components by weight percentages: 75-97% of LaCrO3 and 3-25% of ZrO2. In the refractory material, microstructure is optimized and thermal shock resistance property is improved by grain composition; and ZrO2 phase transformation toughening is applied to the rear-earth perovskite material to strengthen and toughen the material. High temperature property and slag corrosion resistance of the material are improved by improving the structure. Furthermore, the invention provides a novel refractory material for solving the urgent needs of Chinese iron and steel industry and expands the application space of the rear-earth perovskite material, thus fully utilizing Chinese rich rear-earth resources (the use amount of lanthana in the LaMO3 accounts for more than 65%) and producing huge economic benefit and social benefit.

Description

technical field [0001] The invention relates to a refractory material, in particular to a rare earth perovskite type refractory material. Background technique [0002] Refractory materials are indispensable basic materials for high-temperature technology, and their development is closely related to high-temperature industry, especially the iron and steel industry, which are interdependent and develop together. In recent years, with the rapid development of smelting technology and iron and steel industry, refractory materials have also achieved a series of major technological changes, and are gradually shifting from relying on natural raw materials and mass-produced original products to multi-variety, small-batch, artificial raw materials The transformation of precision and high-grade product series based on the principle of , development and design, that is, the transformation from classical refractory materials to diversified new refractory materials. Professor Zhong Xiang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/50C04B35/48
Inventor 李胜利敖青李士刚刘宏华
Owner SHANDONG UNIV
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