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Additive used for preparing ceramic lining steel pipe by self straggle high temperature synthesis

A self-propagating high-temperature, ceramic-lined technology, applied in the field of self-propagating, can solve the problems of unfavorable component control, limited dosage, system temperature drop, etc., and achieve the effect of stable and safe reaction process, high degree of densification, and reduced viscosity

Inactive Publication Date: 2006-06-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding too much additives will absorb heat and reduce the temperature of the entire system, resulting in a series of adverse consequences, such as: it is not conducive to the separation of ceramic phase and metal phase, resulting in inclusions; the drop of system temperature is not conducive to the thorough progress of the reaction
CrO 3 Although the addition of CrO can promote the reaction and increase the reaction temperature, its addition is limited, and too much CrO 3 It will cause splashing of reaction materials, which is unfavorable for component control; add CrO at the same time 3 There will be a strong danger and it is easy to cause an explosion

Method used

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  • Additive used for preparing ceramic lining steel pipe by self straggle high temperature synthesis
  • Additive used for preparing ceramic lining steel pipe by self straggle high temperature synthesis
  • Additive used for preparing ceramic lining steel pipe by self straggle high temperature synthesis

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Embodiment 1: The outer diameter of the steel pipe is Φ74mm, the wall thickness is 5.5mm, and the pipe length is 200mm. Load the mixed reaction raw materials in the tube: aluminum powder 108g, iron oxide powder 160g, reactive additive 16g (wherein titanium powder 16g, iron oxide powder 0g). The steel pipe is clamped on the centrifuge, the speed is 1110 rpm, the reaction material is ignited with a tungsten wire, and the mixed material is ignited by energizing the tungsten wire to ignite. After the reaction is over, stop the rotation and take off the steel pipe.

[0013] The density of the ceramic layer prepared by this process is 3.78g / cm 3 , the appearance of the ceramic layer has no cracks

[0014] figure 1 The scanning electron micrograph of the ceramic lining layer prepared for this process shows that the ceramic layer is dense and has no holes.

Embodiment 2

[0015] Embodiment 2: The outer diameter of the steel pipe is Φ74mm, the wall thickness is 5.5mm, and the pipe length is 200mm. Load the mixed reaction raw materials in the tube: 108g of aluminum powder, 160g of iron oxide powder, and 52g of reactive additives (wherein titanium powder 16, iron oxide powder 36g). The steel pipe is clamped on the centrifuge, the speed is 1110 rpm, the reaction material is ignited with a tungsten wire, and the mixed material is ignited by energizing the tungsten wire to ignite. After the reaction is over, stop the rotation and take off the steel pipe

[0016] figure 2 The scanning electron micrograph of the ceramic lining layer prepared for this process shows that the ceramic layer is dense and has no holes.

Embodiment 3

[0017] Embodiment 3: The outer diameter of the steel pipe is Φ74mm, the wall thickness is 5.5mm, and the pipe length is 200mm. Load the mixed reaction raw materials in the tube: 108g of aluminum powder, 160g of iron oxide powder, 35g of reactive additives (wherein titanium powder 18, iron oxide powder 17g). The steel pipe is clamped on the centrifuge, the speed is 1110 rpm, the reaction material is ignited with a tungsten wire, and the mixed material is ignited by energizing the tungsten wire to ignite. After the reaction is over, stop the rotation and take off the steel pipe

[0018] image 3 The scanning electron micrograph of the ceramic lining layer prepared for this process shows that the ceramic layer is dense and has no holes.

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Abstract

The present invention provides an additive for preparing ceramics lined steel tube by means of self-spreading high-temperature synthesis process. Said additive is formed from titanium powder and iron oxide, in which the titanium powder content is 31-100% of total weight of additive. Besides, said invention also provides its application method.

Description

technical field [0001] The invention belongs to the field of self-propagating technology, and in particular provides an additive for self-propagating high-temperature synthesis to prepare ceramic-lined steel pipes. Background technique [0002] Self-propagating High-temperature Synthesis (SHS for short) is a new technology for preparing materials by exothermic chemical reaction itself. SHS is a new material synthesis method developed by the former Soviet Union in the 1960s. Its most notable feature is to make full use of the high-energy exothermic reaction when forming compounds between elements. In addition to the small amount of external energy necessary to initiate the synthesis reaction, the entire The reaction process is mainly maintained by the heat release of the material itself. The Institute of Chemical Physics of the former Soviet Academy of Sciences found that centrifugal force has a great influence on the combustion process of the thermite reaction in the study ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/65C04B35/46
Inventor 郭志猛高峰林涛
Owner UNIV OF SCI & TECH BEIJING
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