Preparation method of ceramic coating for replacing refractory coating produced by using centrifugal cast iron pipe heated mould method

A technology of ceramic coating and centrifugal cast iron, applied to pipes, rigid pipes, mechanical equipment, etc., can solve problems affecting the health of workers in the production and working environment, affecting the appearance quality of tube blanks, generating air pits, pinholes, etc., to achieve good resistance Slag erosion, high temperature mechanical strength and wear resistance, and the effect of improving the environment

Active Publication Date: 2012-12-05
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the traditional centrifugal cast iron pipe thermal mold production process, the paint needs to be sprayed once for each tube blank produced, and the residual paint on the inner surface of the pipe mold needs to be cleaned after the pipe is pulled out. The paint dust seriously affects the production working environment and the health of the employees, and it is difficult to continue low production efficiency
For thin-walled tube blanks, the coating accounts for a large proportion of the production cost, which increases the production cost. Since the coating contains initiating adhesives, these adhesives will generate a large amount of gas under the action of high-temperature molten iron , casting defects such as air pits and pinholes on the billet will affect the appearance quality of the billet, especially for thin-walled billets, these defects are the main cause of waste products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Take each component according to the following Table 1 and mix them evenly to prepare ceramic coating raw materials.

[0019] (2) Add 28.8kg of water to the ceramic coating raw material to make a slurry.

[0020] (3) Keep the rotational speed of the pipe mold at 300rpm, and flow-coat the above slurry onto the inner surface of the pipe mold within 5 minutes.

[0021] (4) Heat the pipe mold at 100°C for 1 hour until the free water is completely evaporated, and the ceramic coating semi-finished product is completely solidified.

[0022] (5) Keep the rotation speed of the pipe mold at 220rpm, and sinter the semi-finished product of the ceramic coating with 1300°C high-temperature molten iron for 6 minutes. After all the crystal water in it is released, the above-mentioned replacement centrifugal cast iron pipe is obtained by thermal molding method Ceramic coatings for refractory coatings.

Embodiment 2

[0024] (1) Take each component according to the following Table 1 and mix them evenly to prepare ceramic coating raw materials.

[0025] (2) Add 22.8kg of water to the ceramic coating raw material to make a slurry.

[0026] (3) Keep the rotational speed of the pipe mold at 340rpm, and flow-coat the above slurry onto the inner surface of the pipe mold within 8 minutes.

[0027] (4) Heat the tube mold at 150°C for 0.5 hours until the free water is completely evaporated, and the ceramic coating semi-finished product is completely solidified.

[0028] (5) Keep the rotation speed of the pipe mold at 260rpm, and sinter the semi-finished product of the ceramic coating with 2000°C high-temperature molten iron for 9 minutes. After all the crystal water in it is released, the above-mentioned replacement centrifugal cast iron pipe is obtained by thermal molding method Ceramic coatings for refractory coatings.

Embodiment 3

[0030] (1) Take each component according to the following Table 1 and mix them evenly to prepare ceramic coating raw materials.

[0031] (2) Add 21kg of water to the ceramic coating raw material to make a slurry.

[0032] (3) Keep the rotational speed of the pipe mold at 320rpm, and flow-coat the above slurry on the inner surface of the pipe mold within 6 minutes.

[0033] (4) Heat the tube mold at 130°C for 0.75 hours until the free water is completely evaporated, and the ceramic coating semi-finished product is completely solidified.

[0034] (5) Keep the rotation speed of the pipe mold at 240rpm, sinter the above semi-finished ceramic coating with 1340°C high-temperature molten iron for 7 minutes, and wait for all the crystal water in it to be released to obtain the above-mentioned alternative centrifugal cast iron pipe thermal mold method Ceramic coatings for refractory coatings.

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PUM

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Abstract

The invention discloses a preparation method of a ceramic coating for replacing a refractory coating produced by using a centrifugal cast iron pipe heated mould method. Raw materials of the ceramic coating comprise sintered tabular alundum, calcium phosphate and sodium metasilicate. The preparation method comprises the following steps of: adding water in the raw materials of the ceramic coating to form slurry; coating the slurry on the inner surface of a pipe tie in a flow manner; then heating the pipe die at low temperature to enable free water to be completely evaporated; and after the coating is completely solidified, sintering with high-temperature molten iron until crystallization water is completely released to obtain the ceramic coating for replacing the refractory coating producedby using the centrifugal cast iron pipe heated mould method. The ceramic coating disclosed by the invention has the advantages of reduced production cost, continuous production availability and no influence on the quality of pipe billets.

Description

technical field [0001] The invention relates to a preparation method of a ceramic coating, in particular to a preparation method of a ceramic coating which replaces a centrifugal cast iron pipe thermoform refractory coating. Background technique [0002] In the traditional centrifugal cast iron pipe thermal mold production process, the paint needs to be sprayed once for each tube blank produced, and the residual paint on the inner surface of the pipe mold needs to be cleaned after the pipe is pulled out. The paint dust seriously affects the production working environment and the health of the employees, and it is difficult to continue Production, low production efficiency. For thin-walled tube blanks, the coating accounts for a large proportion of the production cost, which increases the production cost. Since the coating contains initiating adhesives, these adhesives will generate a large amount of gas under the action of high-temperature molten iron , Casting defects such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L9/14C04B35/66
Inventor 武贤朱伟王黎辉申勇
Owner XINXING DUCTILE IRON PIPES CO LTD
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