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

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...

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