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Preparation method of ceramic-lined composite stainless steel pipe

A technology of stainless steel pipe and ceramic lining, applied in the direction of pipes, rigid pipes, mechanical equipment, etc., can solve the problems that the ceramic layer is easy to crack and fall off, and affect the quality of the product, so as to reduce thermal stress, compressive stress and thermal stress Effect

Active Publication Date: 2015-09-09
周小新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The interaction of compressive stress and thermal stress makes the ceramic layer easy to crack and fall off, which affects the quality of the product

Method used

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  • Preparation method of ceramic-lined composite stainless steel pipe
  • Preparation method of ceramic-lined composite stainless steel pipe

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preparation example Construction

[0030] A method for preparing a ceramic-lined composite stainless steel pipe comprises the following process steps:

[0031] 1) Take the raw material Fe 2 o 3 powder, other metal oxide powder, Al powder, SiO 2 powder,

[0032] 2) Drying, temperature 150~200℃, 10~12 hours,

[0033] 3) Mix well with a mixer,

[0034] 4) Put the stainless steel tube into the centrifuge and adjust the center,

[0035] 5) Solid-state forced cooling is adopted for the outer surface of the stainless steel tube,

[0036] 6) Put the reaction materials evenly mixed by the mixer into the stainless steel tube,

[0037] 7) Rotate with a centrifuge at a rotation speed of 800~1500 rpm,

[0038] 8) The reaction material is ignited with a tungsten wire,

[0039] 9) Conduct thermite reaction: Fe 2 o 3 , other metal oxides, Al and SiO 2 , (reaction time 5 seconds, reaction temperature 2800 0 c)

[0040] Obtain metal transition layer and ceramic layer,

[0041] 10) Shut down to take out the steel pi...

Embodiment 1

[0053] (1) Take the raw material Fe 2 o 3(4900 g), other metal oxides (NiO, Cr 2 o 3 , CrO 3 etc. 2850g, of which NiO 2150g, Cr 2 o 3 500 g, CrO 3 200g), Al (2280g), SiO 2 Additive (650g), (2) drying, temperature 150~200°C, 10~12 hours, (3) blender evenly, (4) Ф219mm, length 910mm, wall thickness 8mm stainless steel tube into the centrifuge and adjust In the center, (5) take solid-phase forced cooling measures to forcibly cool the outer surface of the Ф219mm stainless steel pipe, (6) put the reaction materials evenly mixed by the mixer into the Ф219mm stainless steel pipe, (7) rotate with a centrifuge at a rotation speed of 800 ~1500 rpm, (8) ignite the reaction material with a tungsten wire, (9) carry out the thermite reaction: Fe 2 o 3 + Other metal oxides (NiO, Cr 2 o 3 , CrO 3 etc.) + Al + SiO 2 Other additives = metal transition layer (Fe, Ni, Cr, etc.) + Al 2 o 3 , (10) Stop the machine and take out the steel pipe, (11) Inspection after cooling (the th...

Embodiment 2

[0055] (1) Take the raw material Fe 2 o 3 (700 g), other metal oxides (NiO, Cr 2 o 3 , CrO 3 etc. 180g, of which NiO 55g, Cr 2 o 3 110 g, CrO 3 15 g), Al (250 g), SiO 2 Additive (50g), (2) drying, temperature 150~200°C, 10~12 hours, (3) mixer to mix evenly, (4) Ф127mm, length 130mm, wall thickness 8mm stainless steel tube into the centrifuge and adjust In the center, (5) take solid-state forced cooling measures to forcibly cool the outer surface of the Ф12mm7 stainless steel tube, (6) put the reaction materials partly mixed by the mixer into the Ф127mm stainless steel tube, (7) rotate with a centrifuge at a rotation speed of 800 ~1500 rpm, (8) ignite the reaction material with a tungsten wire, (9) carry out the thermite reaction: Fe 2 o 3 + Other metal oxides (NiO, Cr 2 o 3 , CrO 3 etc.) + Al + SiO 2 Other additives = metal transition layer (Fe, Ni, Cr, etc.) + Al 2 o 3 , (10) Stop the machine and take out the steel pipe, (11) Inspection after cooling (the th...

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Abstract

The invention is a preparation method of a ceramic-lined composite stainless steel pipe, which includes process steps: 1) taking raw materials; 2) drying; 3) mixing evenly with a mixer; The outer surface of the stainless steel tube adopts solid-state forced cooling; 6) Put the reaction materials evenly mixed by the mixer into the stainless steel tube; 7) Rotate with a centrifuge; 8) Use a tungsten wire to ignite the reaction materials; 9) Carry out thermite reaction; 10 ) Stop the machine to take out the steel pipe; 11) Inspection; 12) Grinding the end surface burrs; 13) Ceramic-lined composite stainless steel pipe products. Advantages: 1) Limit the thermal expansion of the outer stainless steel tube, reduce the surface temperature of the outer stainless steel tube during the aluminothermic reaction; 2) reduce the thermal stress caused by the difference in thermal expansion coefficient, reduce the compressive stress and thermal stress during the cooling process, And successfully prepared ceramic-lined composite stainless steel pipe. The step-shaped ceramic-lined composite stainless steel pipe was prepared by secondary molding method.

Description

technical field [0001] The invention relates to a preparation method of a ceramic-lined composite stainless steel pipe, which adopts a centrifugal thermite process, and achieves a reduction in the distance between the stainless steel pipe and the inner stainless steel pipe by limiting the thermal expansion of the outer stainless steel pipe and adding other metal oxides to form a gradient transition layer technology. The difference in the thermal expansion coefficient of the lining ceramic layer reduces the influence of thermal stress on the ceramic layer during the cooling process, thereby preparing a ceramic-lined composite stainless steel pipe. Through secondary molding, a stepped ceramic-lined composite stainless steel pipe can be prepared. It belongs to the technical field of ceramic-lined composite stainless steel pipe preparation. Can be widely used in petrochemical industry. Background technique [0002] There are two main techniques for the preparation of existing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L9/14C04B37/02
CPCC04B37/026F16L9/14
Inventor 周小新周欣怡
Owner 周小新