Making method of high-compactness ceramic-lined steel tube

Abstract

The invention relates to a making method of a high-compactness ceramic-lined steel tube, and belongs to the technical field of a self-propagating ceramic-lined steel tubes. The method comprises the following steps: placing an axial grinding rod in a steel tube, fixing the axial grinding rod in a lateral direction, mixing and filling the steel tube with thermite according to a certain proportion, carrying out high-speed rotation on the steel tube under the action of centrifugal force, carrying out ignition to make the thermite undergo an SHS reaction to generate Al2O3 and Fe which are in a molten state due to a large amount of heat generated during the reaction in order to form a ceramic layer liner; and continuously squeezing out bubbles in the above product by the grinding rod in the steel tube due to the continuous high-speed rotation of the steel tube when the product is molten in the molten state in order to enhance the compactness of a coating layer material and flatten the surface of ceramic, and cooling the ceramic to obtain the smooth and compact ceramic-lined steel tube. The method has the advantages of simplicity and low cost of raw materials, and the produced steel tube has the characteristics of high precision, high compactness, high strength, high wear resistance and high corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of self-propagating ceramic-lined steel pipes, and in particular provides a preparation method for high-density ceramic-lined steel pipes. Background technique [0002] In modern industries, such as electric power, chemical industry, metallurgy and other industries, wear-resistant and anti-corrosion pipes are widely used. Self-propagating high-temperature synthesis (SHS) technology is a new technology that uses external energy to induce local chemical reactions, uses the chemical reaction itself to exotherm, makes the reaction continue, and rapidly prepares materials. The theory was proposed by the former Soviet scientist Merzhanov in 1967, and he carried out research on the influence of centrifugal force field on the combustion process of condensed matter. Subsequently, scholars from the United States, Japan and other countries studied the process in detail. In 1981, Odawara prepared a ceramic-lined steel...

AI Technical Summary

Problems solved by technology

However, a certain amount of pores will still remain in the ceramic layer prepared by this method, which increases the crack rate of the finished product, and the cost is also high.