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Address:Pingxiang city, Jiangxi Province

High temperature refractory material with nano-alumina

Nano composite corundum brick and magnesia-chrome brick

The use of certain mixing process, add a small amount of nano-powder to the batch composition system. Such as adding a few ingredients corundum brick nano-alumina (VK-L30N) and nano-silica (VK-SP30), adding nano ferric oxide in magnesite-chrome brick ingredients, can significantly improve the sample mechanical properties.

Nano-silica (VK-SP30) composite corundum brick bending strength and compressive strength of the experimental test results show. Nano-silica is added, can greatly improve the mechanical properties of the sample, especially when adding an appropriate amount of 1% to 2% by firing sample 1450,1550 ℃, its strength and not relative Jia Nami material ratio increased by 1.5 to 2.0 times, such as the non-nano-powder sample and the sample was added 2% nano-silica (VK-SP30) when compared to the compressive strength, respectively, from 15.8, 60.5MPa rose to 170.4, 179.6MPa.

After 1700 ℃ & times; specimen fracture SEM photograph 3h after treatment, it can be seen, after the MgO-Cr2O3 refractories added iron oxide nanoparticles microstructure changed greatly.

2, nanocomposites Al2O3-SiC-C <b> castable

Al2O3-SiC-C castable because of its excellent performance has been stable in the hook, the wide range of applications. To further enhance the Al2O3-SiC-C castable high temperature performance, especially high temperature mechanical strength, with a silica-alumina gel powder substitute the most calcium aluminate cement binder, its introduction could significantly reduce Sialon generation temperature, and to promote the & beta; -Sialon generating phase. Thus, nano Al2O3-SiO2 gel powder composite Al2O3-SiC-C castable with high temperature flexural strength (1400 ℃ & times; 0.5h).

After adding the gel powder, nano-composite Al2O3-SiC-C castable Sialon generation temperature decreases, the temperature 1100 ℃ has been found that & beta; -Sialon, and the use of cement bound Al2O3-SiC-C castable at 1100 ℃ only Si2N2O phase transition occurs.

Such nanocomposite Al2O3-SiC-C castable has been completed in a domestic steel mill blast furnace No.2 Industrial Test (1536m3) main grooves (including sand port) on. Without the one-time repair through iron reached 15.79t, than similar non-nanocomposite Al2O3-SiC-C castable 12t level, is currently promoting the application on other domestic ironworks blast ditch.

Quality sizing mouth expanding decide billet casting of life fast rate. Analysis showed that the main reason for expanding product strength is low, large pores, thus reducing the use of nanotechnology ZrO2 quality sizing nozzle pores, it is expected to improve its performance.

Nano zirconia (VK-R30Y3) ZrO2 composite of sizing nozzle body, through 1500 ℃ & times; and ZrO2 nanocomposite before sizing nozzle through 1800 ℃ & times 6h after firing; bulk density and 6h after firing same porosity and nano-composite samples were 800 ℃ & times; 6h after firing, which apparent porosity from 19% to 11%. Pore size and pore volume were smaller, mostly in 10nm. Visible, nano zirconia (VK-R30Y3) filled mainly plays the role in filling the pores and lead to sintering.

Sintering mechanism refractories for evaporation - condensation process, as Cr2O3 at a high temperature sintering conditions exist easily evaporates and high evaporation rate, so the general magnesia chromite refractories showed that there were high porosity, large pore volume density low defects, thus affecting the performance of the anti-slag erosion.

Nanotechnology beneficial to reduce the apparent porosity of magnesia chromite refractories and enhance its bulk density, which is expected to improve slag resistance of the treated magnesium chrome brick. From the microscopic structure, no matter how much temperature processing classics, with around the hole after MgO-Cr2O3 sol treatments were formed a dense MgO-Cr2O3 quality deposits.

4, nano-coated graphite oxide film

Carbon steel with easy to be moist and slag and high thermal performance characteristics, added to the oxide-based castable its performance can be greatly improved, therefore, the current carbon-castable research and development have been refractories industry has become a hot topic. Since water does not wet graphite surface, so that graphite is difficult to break down in castable, castable affect liquidity, which has become the most important issue impede the further development of the carbonaceous material and casting applications.

For the graphite surface modification, through a variety of inorganic salt hydrolysis in natural flake graphite coated nano-oxide film.

Various film-coated graphite oxide nano after 500 ℃ treatment, the surface coated with amorphous oxides are way exists, coated on the surface of graphite and graphite oxide formed COM (M represents a metal) bond with characteristic chemical adsorption. After the coated graphite oxide nano particle shape changes, the average particle size increases, increasing the surface fractal dimension.

Nano-oxide coated graphite wetting angle with water relative to untreated graphite are greatly reduced, aluminum oxide coated graphite exhibit more excellent hydrophilic, high dispersion stabilizing performance.

In addition, the oxidation reaction nano-coated aluminum oxide (VK-L30N) of graphite apparent activity can improve the antioxidant capacity enhancement. Graphite coated titanium dioxide oxidation resistance no big improvement, reduced antioxidant capacity of nano-coated zirconium dioxide and chromium oxide of graphite, which is zirconium dioxide and chromium oxide on carbon - oxygen reaction catalysis Caused.

Nanotechnology can be better prepared performance refractories. Nano powder does refractories have significantly improved the performance of the role.

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