Reactive material for preparing ceramic composite steel pipe by adopting self-propagating high-temperature synthesis

Abstract

The invention discloses a reactive material for preparing a ceramic composite steel pipe by adopting self-propagating high-temperature synthesis, comprising aluminum powder, iron oxide powder, silicon dioxide and sodium tetraborate. The invention has the advantages that (1) a ceramic layer has high density and smooth inner surface after using the reactive material; (2) after using the reactive material, the shearing strength and the pressing strength of the composite steel pipe are improved; (3) after using the reactive material, the abrasive resistance and the corrosion resistance of the composite steel pipe are improved, and the service life of the composite steel pipe is prolonged; and (4) the composite steel pipe prepared by using the reactive material can be used in the fields of electric power, mines, metallurgy, petroleum, chemical industry and the like.

Description

Technical field: [0001] The invention relates to a reaction material for preparing ceramic composite steel pipes by adopting self-propagating high-temperature synthesis. Background technique: [0002] Self-propagating High-temperature Synthesis (SHS), also known as Combustion Synthesis (CS), is a new technology that uses the exothermic heat of a chemical reaction to continue the reaction and finally synthesize the desired material or product. This technology is a new material synthesis process proposed by Russian scientist Merzhanov in the late 1960s. The basic principle is to use externally provided energy to locally burn the highly exothermic reaction system, and the reaction forms a frontal combustion wave. With the support of the heat released by itself, the reaction continues to move forward with the combustion wave, and the reaction and synthesis have specified components and Combustion products of structures. The former Soviet Union is at the forefront of the world ...

AI Technical Summary

Problems solved by technology

Guo Fuan et al. mentioned in the article "Research and Application of Centrifugal Self-propagating High Temperature Synthetic Ceramic Lined Composite Steel Pipe" in "Journal of Hunan Nonferrous Metals", Volume 18, Issue 6, 2002, that adding SiO 2 It can increase the corrosion resistance and density of the composite pipe ceramic layer, but with the increase of the amount, the hardness decreases and the crushing strength decreases; The effect of centrifugal SHS ceramic composite steel pipe structure and properties" mentioned in the article that adding ZrSiO 4 It can effectively improve the shear strength of the composite pipe, but it cannot increase the density of the ceramic layer. Adding TiO 2 The density and shear strength of the ceramic layer can be studied, but its corrosion resistance has not been studied; Zhang Weiming et al. in the "Journal of Materials Science and Engineering", Volume 26, No. 1, 2008 "CuO's effect on the structure of SHS ceramic-lined composite pipes separated by gravity". It is mentioned in the article that the addition of CuO can increase the exothermic heat of the reaction, and also have a significant impact on the hardness and corrosion resistance, but there is O in the reaction 2 Generated, causing the melt to splash, easy to form pores in the ceramic melt; 2 B 4 o 7 Effects on the structure and performance of centrifugal SHS ceramic-lined composite steel pipe” mentioned in the article, Na 2 B 4 o 7 (Sodium tetraborate) doped thermite can improve the compressive shear strength of the composite pipe, but Na 2 B 4 o 7 When the content increases, its decomposition and heat absorption will lower the reaction temperature, shorten the residence time of the melt in the liquid phase, and make the bubbles not have enough time to escape, which is not conducive to the reduction of porosity. In addition, this additive cannot reduce the corrosion resistance of the ceramic layer.

[0005] Additives are mentioned in the formulas used in the above-mentioned self-propagating high-temperature synthetic composite pipes, but they are all single formulas, which can only improve part of the properties of the composite steel pipes.