CN1046517A - Refractory, energy saving and corrosion-resisting ceramics coating - Google Patents

Abstract

The invention discloses a kind of preparation method of refractory, energy saving and corrosion-resisting ceramics coating.It is with ZrO ₂With ZCS sosoloid be base-material, with high-temperature inorganic adhesive Al (H ₂PO ₄) ₃, solidifying agent (kaolin), blackening agent (SiC, C, Fe etc.), dispersion agent (NaHPO ₄) and toughner (C ₂₄H ₃₈O ₄) etc. the prescription of preferably combination, make the ceramic coating of tool high radiant rate, high-temperature corrosion resistance, but be used for that energy efficient reaches more than 10% in the High-temp. kiln, and can prolong chimney arch life-span 0.5-1 doubly.

Description

Refractory, energy saving and corrosion-resisting ceramics coating

The present invention is that a kind of function pottery is thrown off restraint material, particularly a kind of energy-conservation, corrosion resistant ceramic coating that is coated in the refractory brick surface.

At present, being used for the heat stove in the metallurgical industry, all is to build up with refractory brick or casting material, and raw material or workpiece are processed by radiation heating in stove.But the 1-5 μ wave band that this stove is relatively concentrated in the high temperature power spectrum, its radiation coefficient is lower usually, therefore, the thermal radiation heat transfer efficiency is also low, moreover, more intense oxidizing atmosphere or reductibility institute atmosphere are arranged in high temperature fuel oil or the gas furnace, refractory materials commonly used is often by high temperature corrosion, cause the work-ing life of stove not long, the high radiation paint ET-4 and the Japanese Patent 60-251185 of the development of Britain CRC company, 60-251186 and United States Patent (USP) 4072530 described high-temperature energy-saving coating materials, or because of failing simultaneously to solve above-mentioned two problems preferably, or, all fail to obtain industrial large-scale popularization because of cost is too high.

The purpose of this invention is to provide a kind of high-temperature corrosion resistance that both had, can have the coating of high radiant rate again, to improve the work-ing life of stove, save energy at 1-5 μ wave band.

The present invention realizes by following mode: the utilization coating composition is sintered to the theory and the technology of polycrystalline ceramics; optimize compound with dystectic high-temperature stable; this compound becomes the sosoloid of resistant to elevated temperatures phosphoric acid salt and silicate with the binding agent sintering reaction; make its potteryization; this sosoloid has higher radiance at the coupling wave band of radiation wave spectrum and absorption spectrum; and can utilize SiC and the C component in pottery; under＞1200 ℃ high temperature; be in the reaction of complementary running balance; form the coating of one deck densification; intercept the infiltration of high temperature corrosion gas, with refractory brick or the casting material in the protection stove.In the prescription of the present invention, utilize stable ZrO ₂Give coating good heat-shock resistance, with ZCS sosoloid (CaO and SiO ₂Be dissolved in ZrO ₂Sosoloid) be base-material, with high-temperature inorganic adhesive [AL(H ₂PO ₄) ₃], solidifying agent (kaolin), blackening agent (SiC, C, Fe ₂O ₃, Fe etc.), dispersion agent (sodium phosphate) and toughner (dioctyl phthalate (DOP)) is with preferably combination, makes coating obtain the firm over-all properties of high radiant rate, high-heat resistance shock resistant, high-temperature corrosion resistance and matrix bond of required wave band.Its concrete prescription and production technique are as follows:

1. formulation for coating material:

A) filling mixture ratio (calculating by weight percentage):

200 order content are zircon sand 15-35 part of 63%

400 order silicon carbide (SiC) 10-25 parts

400-600 order Graphite Powder 99 (C) 5-15 part

300 orders, two oxysome zirconium (ZrO ₂) 5-15 part

500 order oxysome aluminium (Al ₂O ₃) 5-15 part

200 order kaolin 5-15 parts

Calcium oxide (CaO) 1-3 part

Titanium dioxide (TiO ₂) 1-3 part

Ferric oxide (Fe ₂O ₃) 1-3 part

Silicon-dioxide (SiO ₂) 1-4 part

Chromic oxide (Cr ₂O ₃) 1-5 part

Straight iron powder (Fe) 1-3 part

B) binding agent proportioning (calculating by weight percentage):

Aluminium dihydrogen phosphate [Al(H ₂PO ₄) ₃] 100 parts, PH=1-2

10 parts of sodium phosphates (dispersion agent)

10 parts of dioctyl phthalate (DOP)s (toughner)

2. coating manufacture process:

As shown in Figure 1, the filler each component is pulverized respectively, poured into grinding machine for grinding then, and add the dispersion agent sodium phosphate, add the fully stirring of binding agent (aluminium dihydrogen phosphate) and toughner (dioctyl phthalate (DOP)) after screening, mixing, it is stand-by to get the Sleepy material.

When using above-mentioned coating, at first the burner hearth internal surface is cleaned out, sprayed with 60% phosphoric acid then, the burner hearth internal surface is soaked into, and stenciling coating is two-layer again, treats that its natural airing is after one day after making its thickness reach 0.5-1mm, press accompanying drawing 2 and heat up, come into operation by the ordinary production intensification after 32 hours.

Embodiment: in heater for rolling steel, fuel oil radiation wave spectrum all concentrates on 1-10 μ as the absorption spectrum that is heated steel ingot top layer ferric oxide, therefore will improve the radiation coefficient of this coupling wave band, and its concrete proportioning is:

Filling mixture ratio (calculating by weight percentage):

10 parts of 200 order kaolin;

200 orders contain 30 parts of 63% zircon sands;

20 parts in 400 order silicon carbide;

10 parts of 400-600 order Graphite Powder 99s;

10 parts of 300 order zirconium dioxides;

10 parts in 500 order aluminum oxide;

1.5 parts in calcium oxide;

2 parts of titanium dioxide;

1.5 parts of ferric oxide;

2 parts of silicon-dioxide;

2 parts in chromic oxide;

1 part of blunt iron powder;

The binding agent proportioning:

100 parts of PH=1-2 of phosphoric acid dioxy aluminium;

10 parts of sodium phosphates

10 parts of dioctyl phthalate (DOP)s

Above-mentioned filler each component is pulverized respectively, ground, and add 10 parts of sodium phosphates, add 10 parts of 100 parts of aluminium dihydrogen phosphates and dioctyl phthalate (DOP)s after screening, mixing, promptly can be used for the coating usefulness of high-temperature burner hearth internal surface after fully stirring, using method as mentioned above.

The present invention's coating energy-saving effect reaches more than 10%, and can prolong chimney arch life-span 0.5-1 doubly.

Claims (2)

1, a kind of refractory, energy saving and corrosion-resisting ceramics coating, the prescription (by weight percentage) that it is characterized in that coating is to be zircon sand 15-35 part of 63% by 200 order content, 400 order silicon carbide 10-25 parts, 400-600 order Graphite Powder 99 5-15 part, 300 order zirconium dioxide 5-15 parts, 500 order aluminum oxide 5-15 parts, 200 order kaolin 5-15 parts, calcium oxide 1-3 part, titanium dioxide 1-3 part, ferric oxide 1-3 part, silica 1-4 part, chromic oxide 1-5 part, straight iron powder 1-3 part adds 10 parts of PH=1-1.5 of binding agent aluminium dihydrogen phosphate again, 10 parts of 10 parts of sodium phosphates and dioctyl phthalate (DOP)s.

2, a kind of manufacturing process of refractory, energy saving and corrosion-resisting ceramics coating, it is characterized in that the each component of filler is pulverized respectively, pour grinding machine for grinding then into, and adding the dispersion agent sodium phosphate, adding binding agent aluminium dihydrogen phosphate and toughner dioctyl phthalate (DOP) fully stir after screening, mixing.

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