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A preparation method for heat-resistant and anti-oxidation coating containing enamel powder on the surface of cast iron

A technology of anti-oxidation coating and enamel powder, which is used in the preparation of heat-resistant and anti-oxidative coatings, and the preparation of heat-resistant and anti-oxidative coatings on cast iron surfaces, can solve the problem of reducing the service life of cast iron products, coating reliability, coating The adhesion between the layer and the substrate is not strong enough, the coating is prone to cracking or peeling, etc., to achieve the effect of easy operation, high bonding strength, and uniform coating

Inactive Publication Date: 2015-08-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Surface coating protection is an effective way to solve the heat-resistant and anti-oxidation properties of cast iron surfaces. The problem is that the bonding force between the coating and the substrate is not strong enough, and the expansion coefficient does not match, which makes the coating prone to cracking or peeling when subjected to thermal fatigue or impact, thereby significantly reducing the service life of cast iron products and the reliability of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Mix quartz 20, feldspar 20, borax 30, sodium nitrate 5, soda ash 10, fluorite 5, nickel oxide 3, cobalt oxide 2, barium molybdate 5 (mass fraction ratio of enamel powder formula raw materials) according to mass percentage got the mixture;

[0023] (2) Melt the batch material in an electric furnace of silicon-molybdenum rod at 1250°C for 2 hours, quench the melted mixture into glass frit, dry the glass frit, dry ball mill and pass through a 200-mesh standard sieve to obtain Enamel powder.

[0024] (3) 5% enamel powder, 24% aluminum powder, 1% ammonium chloride, and 70% aluminum oxide are mixed to obtain a mixture by mass fraction, and acetic acid varnish is added in the mixture and fully stirred to make a coating; wherein The consumption of acetic acid varnish is 10% of the quality sum of enamel powder, aluminum powder, aluminum oxide and ammonium chloride;

[0025] (4) Carry out degreasing, annealing and sandblasting treatment on the surface of the cast iron sampl...

Embodiment 2

[0028] (1) Mix quartz 20, feldspar 20, borax 30, sodium nitrate 5, soda ash 10, fluorite 5, nickel oxide 3, cobalt oxide 2, barium molybdate 5 (mass fraction ratio of enamel powder formula) according to mass fraction got the mixture;

[0029] (2) Melt the batch material in an electric furnace of silicon-molybdenum rod at 1250°C for 2 hours, quench the melted mixture into glass frit, dry the glass frit, dry ball mill and pass through a 200-mesh standard sieve to obtain enamel powder;

[0030] (3) 10% enamel powder, 65% aluminum powder, 1% ammonium chloride, and 24% aluminum oxide are mixed to obtain a mixture by mass percentage, and acetic acid varnish is added in the mixture and fully stirred to make a coating; wherein The consumption of acetic acid varnish is 5% of the quality sum of enamel powder, aluminum powder, aluminum oxide and ammonium chloride;

[0031] (4) Carry out degreasing, annealing and sandblasting treatment on the surface of the cast iron sample for industri...

Embodiment 3

[0034] (1) Mix quartz 20, feldspar 20, borax 30, sodium nitrate 5, soda ash 10, fluorite 5, nickel oxide 3, cobalt oxide 2, barium molybdate 5 (mass fraction ratio of enamel powder formula) according to mass fraction got the mixture;

[0035] (2) Melt the batch material in an electric furnace of silicon-molybdenum rod at 1250°C for 2 hours, quench the melted mixture into glass frit, dry the glass frit, dry ball mill and pass through a 200-mesh standard sieve to obtain enamel powder;

[0036] (3) 15% enamel powder, 50% aluminum powder, 1% ammonium chloride, and 34% aluminum oxide are mixed to obtain a compound by mass percentage, and acetic acid varnish is added in the compound and fully stirred to make a coating; wherein The consumption of acetic acid varnish is 15% of the quality sum of enamel powder, aluminum powder, aluminum oxide and ammonium chloride;

[0037] (4) Degreasing, annealing, and sandblasting the surface of the cast iron sample, and then coating the prepared ...

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PUM

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Abstract

The invention relates to a preparation method of an enamel powder-containing heat resistant antioxidative coating for cast iron surface, which comprises the following steps: (1) mixing enamel powder, aluminium powder, alumina, and ammonium chloride, then adding a little acetic acid varnish and acetone, uniformly mixing, obtaining a coating; (2) coating the coating on a sample surface, naturally drying the sample coated with the coating in the air for 10-30 min, after drying, putting the sample in a furnace at 850-950 DEG C to perform heat treatment diffusion for 20-120 min, preparing the heat resistant antioxidative coating on the sample surface. The preparation process of the invention has simple requirements, simple operations, is suitable for industrial production; the heat resistant antioxidative coating prepared by the invention has high binding strength, is uniform, heat-resistant, antioxidative, has no surface oxidative cracking or flaking after high temperature calcination for tens of hours.

Description

technical field [0001] The invention belongs to the field of preparation of heat-resistant and anti-oxidation coatings on cast iron surfaces, in particular to a method for preparing heat-resistant and anti-oxidation coatings containing enamel powder on cast iron surfaces. Background technique [0002] Cast iron is an iron-carbon alloy with a carbon content of more than 2%. Its types include gray cast iron, white cast iron, malleable cast iron, nodular cast iron, vermicular cast iron and alloy cast iron. And it is widely used. Its gray cast iron can be used to manufacture structural parts such as machine tool beds, cylinders, and boxes. White cast iron can be used to prepare wear-resistant parts. Malleable cast iron can be used to manufacture parts with complex shapes and strong dynamic loads. , Nodular cast iron can be used to manufacture internal combustion engines, auto parts and agricultural machinery, etc. Its alloy cast iron has corresponding characteristics of heat res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C8/14
Inventor 蒋伟忠廖小平方倩倩钱蕙春
Owner DONGHUA UNIV