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A high temperature enamel for high chromium white cast iron

A high-chromium white cast iron, high-temperature technology, applied in the field of enamel to achieve the effect of enhancing strength, simplifying cumbersome processes, and simplifying processes

Active Publication Date: 2020-07-10
赵庭玉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-temperature enamel for high-chromium white cast iron to solve the problems in the prior art above, so that the high-temperature enamel has excellent high-temperature corrosion resistance and oxidation resistance, and the enamel is bonded to high-chromium white cast iron. Strong connection, no peeling and oxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Raw materials

[0026] Preparation of Al(H 2 PO 4 ) 3 The raw materials are: industrial phosphoric acid and Al(OH) with a concentration of 85% 3 ;

[0027] The preparation of cordierite microcrystalline ceramic material is composed of the following raw materials by mass percentage: SiO 2 49%, Al 2 o 3 22%, MgO17%, TiO 2 10.5%, P 2 o 5 1.5%.

[0028] (2)Al(H 2 PO 4 ) 3 and preparation of cordierite micro-ceramics

[0029] Al(H 2 PO 4 ) 3 The preparation is as follows: add 85% industrial phosphoric acid to 41.7% (according to the mass of phosphoric acid) water and stir evenly to prepare a 60% aqueous solution, then add Al(OH) 3 , Al(OH) 3The weight ratio to phosphoric acid aqueous solution is 1:6.7, heated to 70-80°C, reacted for 30-60min, until the solution is clear, Al(H 2 PO 4 ) 3 .

[0030] The preparation of cordierite microcrystalline ceramics is as follows: accurately weigh the raw material formula contained in the preparation of cordi...

Embodiment 2

[0032] (1) Raw material

[0033] The raw materials for preparing high-temperature enamel are composed of: Al 2 o 3 12%, Feldspar 25%, Quartz 4%, ZrO 2 5%, CoO 1%, TiO 2 4%, Cr 2 o 3 3%, Fe 2 o 3 5%, dolomite 7%, Suzhou soil 6%, LiCO 3 13%, Al(H 2 PO 4 ) 3 5%, cordierite microcrystalline ceramic material 10%. al 2 o 3 and ZrO 2 The particle size of the powder is 0.06mm, which contains 20% of 80μm ultrafine powder particles.

[0034] (2) Preparation of high temperature enamel for high chromium white cast iron

[0035] Accurately weigh the above-mentioned raw material formula for preparing high-temperature enamel with a balance, add 45% (according to the total mass of raw materials) of water and mix, grind into a dispersion liquid, pass through an 80-mesh sieve, and the sieve residue <1.5%, the obtained The density of the dispersion was 1.65 g / mL.

Embodiment 3

[0037] (1) Raw material

[0038] The raw materials for preparing high-temperature enamel are composed of: Al 2 o 3 9.5%, Feldspar 20%, Quartz 5%, ZrO 2 6%, CoO 2%, TiO 2 3%, Cr 2 o 3 2%, Fe 2 o 3 4%, dolomite 8%, Suzhou soil 6%, LiCO 3 11%, Al(H 2 PO 4 ) 3 11%, cordierite microcrystalline ceramic material 12.5%. al 2 o 3 and ZrO 2 The particle size of the powder is 0.06mm, which contains 25% of 100μm ultrafine powder particles.

[0039] (2) Preparation of high temperature enamel for high chromium white cast iron

[0040] Accurately weigh the above-mentioned raw material formula for preparing high-temperature enamel with a balance, add 65% (according to the total mass of raw materials) of water and mix, grind into a dispersion liquid, pass through an 80-mesh sieve, and the sieve residue <1.5%, the obtained The density of the dispersion liquid was 1.60 g / mL.

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Abstract

The invention discloses high-temperature enamel for high-chromium white cast iron. The high-temperature enamel is characterized by being prepared from the following ingredients in percentage by weight: 15 to 35 percent of Al2O3, 11.5 to 45 percent of SiO2, 3 to 16 percent of ZrO2, 1 to 4 percent of CoO, 2.5 to 13.5 percent of TiO2, 1.5 to 7.9 percent of Cr2O3, 0.5 to 12 percent of Fe2O3, 3 to 6 percent of CaO, 1 to 15 percent of Li2O, 3 to 8 percent of K2O, 2.5 to 9.3 percent of MgO and 3 to 18 percent of P2O5. The high-temperature enamel can be directly coated onto the surface of the high-chromium white cast iron; through firing at 1250 to 1300 DEG C and natural cooling, the hard and bright enamel surface is formed on the surface of the high-chromium white cast iron; excellent high-temperature anti-corrosion anti-oxidation performance is realized; rapid cooling and quick heating are performed in a Stokerfeed boiler with temperature being 1050 to 1200 DEG C; then, the enamel and the high-chromium white cast iron are firmly bonded; no peeling and oxidation phenomena exist; the high-temperature enamel can be widely applied in various severe high-temperature environments or sulphur-containing high-temperature environments, and can also be used in high-temperature wear-resistant environments.

Description

technical field [0001] The invention relates to the field of enamel, in particular to a high-temperature enamel for high-chromium white cast iron. Background technique [0002] High chromium white cast iron is a heat-resistant and wear-resistant material with excellent performance, in which Cr 2 o 3 The content is 11.3-30%, and the service temperature is 720-950°C. It is a high-temperature wear-resistant material widely used in modern industry. With the development requirements of industrial technology, the temperature of modern sintering furnaces has been raised to 1050-1200°C or even higher. It has exceeded the working limit of 950°C for high-chromium white cast iron, and the problems of accelerated oxidation corrosion rate and shortened life have appeared, especially when the furnace gas contains sulfur, the high-temperature corrosion is more serious. In order to solve the above problems, refractory coatings are often used to coat the surface of high-chromium white cas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C8/08C03C10/08
CPCC03C8/08C03C10/0045
Inventor 赵庭玉
Owner 赵庭玉
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