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Glaze and preparation method of high-temperature-resistant metal coating

A glaze and coating technology, applied in the field of preparation of glaze and high temperature resistant metal coatings, can solve problems such as peeling and premature softening, and achieve the advantages of improving strength, complete preparation process, and reducing liquid phase flow performance and melting performance. Effect

Inactive Publication Date: 2020-07-17
SHANGHAI FINEWAY ENERGY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in actual use, especially the heating surface used in power plant boilers, under the condition of flue gas corrosion, its service temperature is as high as 600 ° C, and conventional enamel products basically soften and fall off prematurely after direct use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Pretreatment of the substrate

[0023] The metal substrate of SS 304 stainless steel (0.08% carbon content) is subjected to high temperature oil burning, pickling, alkali washing and drying.

[0024] (2) Preparation of coating glaze

[0025] (a) Preparation of base glaze: the acid-resistant glass batch material (mass percentage is SiO 2 : 56-58%; Na 2 O+K 2 O+Li 2 O: 15-18%; CaO+MgO+SrO: 5-7%; B 2 o 3 : 5-7%, Al 2 o 3 : 2~3%, TiO 2 : 1~3%, ZnO: 0~1%, CoO: 1-2%; NiO: 1-2%.) Mix evenly, melt at 1420°C for 2~4h, water cooling, ball mill, pass through 140 mesh sieve, base glaze.

[0026] (b) Preparation of bottom glaze: take a certain amount of base glaze and put it into a ball mill jar, and its proportioning mass parts are: base glaze 100 parts, clay: 5 parts, sodium nitrite: 0.3 parts, borax: 0.4 parts, Cr 2 o 3 : 5 servings. Weigh the added material according to the proportion and carry out ball milling. According to the material-to-ball ratio of 3:1, ...

Embodiment 2

[0032] (1) Pretreatment of the substrate

[0033] The metal substrate is a 12Cr1MoVG alloy tube, and other processes are the same as in Example 1.

[0034] (2) Preparation of coating glaze

[0035] (a) Preparation of base glaze: the acid-resistant glass batch material (mass percentage is SiO 2 : 56-58%, Na 2 O+K 2 O+Li 2 O: 18-20%, CaO+MgO+SrO: 6-7%, B 2 o 3 : 6-8%, Al 2 o 3 : 2~3%, TiO 2 : 1~3%, ZnO: 1~2%, CoO: 0-1%, NiO: 0-2%) mixed evenly, melted at 1420℃ for 2~4h, water cooled, ball milled, passed through a 140 mesh sieve, as the base glaze.

[0036] (b) Preparation of bottom glaze: take a certain amount of base glaze and put it into a ball mill jar, and its proportioning mass parts are: base glaze 100 parts, clay: 5 parts, sodium nitrite: 0.3 parts, borax: 0.4 parts, ZrO 2 : 8 servings. Weigh the added material according to the proportion and carry out ball milling. According to the material-to-ball ratio of 3:1, pass the ball-milled pre-abrasive material th...

Embodiment 3

[0042] (1) Pretreatment of the substrate

[0043] The metal substrate is a 20G steel pipe, and other processes are the same as in Example 1.

[0044] (2) Preparation of coating glaze

[0045] (a) Preparation of base glaze: the acid-resistant glass batch material (mass percentage is SiO 2 : 56-58%, Na 2 O+K 2 O+Li 2O: 18-20%, CaO+MgO+SrO: 6-7%, B 2 o 3 : 6-8%, Al 2 o 3 : 2~3%, TiO 2 : 1~3%, ZnO: 1~2%, CoO: 0-1%, NiO: 0-2%.) Mix evenly, melt at 1420℃ for 2~4h, water cooling, ball mill, and pass through 140 mesh sieve.

[0046] (b) Prepare the bottom glaze: take a certain amount of base glaze and put it into a ball mill jar, and its proportioning mass parts are: base glaze 100 parts, clay: 5 parts, sodium nitrite: 0.3 parts, borax: 0.4 parts, SiO 2 : 8 servings. Weigh the added material according to the proportion and carry out ball milling. According to the material-to-ball ratio of 3:1, pass the ball-milled pre-abrasive material through a 140-mesh sieve.

[0047] ...

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Abstract

The invention belongs to the field of glazes, in particular to glaze and a preparation method of a high-temperature-resistant metal coating. When the surface glaze coating is prepared, the adopted glaze material comprises base glaze, a grinding additive and inorganic fibers, and for every 100 parts of base glaze, the grinding additive comprises the following components in parts by mass: 5 parts ofclay, 0.2-0.6 part of sodium nitrite, 0.2-0.6 part of borax, 2-25 parts of refractory aggregate and 2-20 parts of inorganic fibers. According to the invention, the fibers are added into the metal coating, the fiber having one-dimensional structure; after a short-time enamel sintering process, the fibers are not melted; therefore, the strength of the enamel material can be remarkably improved by the coating at 600 DEG C; the liquid phase flowing property and the melting property of the enamel are reduced, good fiber morphology can be kept in a metal coating; the invention can be applied in thehigh-temperature-resistant high-strength metal composite material, the use temperature of the metal coating can be remarkably increased, and the use temperature can be increased to 750 DEG C in the highest period of time.

Description

technical field [0001] The invention belongs to the field of glazes, and in particular relates to a preparation method of glazes and high-temperature-resistant metal coatings. Background technique [0002] Metal coating refers to the coating of a layer of enamel with high silicon content on the metal surface; a metal-inorganic composite material formed by high-temperature enamel. It has the characteristics of easy forming and high strength of metal materials, and can also play the role of chemical resistance and stability of inorganic materials. It is widely used in high temperature protection in the fields of architectural decoration, waste heat recovery of flue gas, and chemical containers. [0003] However, in order to have a good sealing performance, the inorganic coating must hang at high temperature to form a liquid phase, and have a good wetting effect on the metal matrix material to achieve sealing. A lower glass phase temperature is good for sealing, but it is grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C8/00C23D5/02
CPCC03C8/00C23D5/02C03C2207/04
Inventor 杨少民
Owner SHANGHAI FINEWAY ENERGY ENG
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