Nitridais surištas silicio karbidas

Nitride-bonded silicon carbide is an incredibly strong and tough material with exceptional corrosion resistance properties that makes an ideal side wall material for large prebaked aluminum electrolytic cells.

Thus far, attempts at producing a bond for silica that would provide very high strength at elevated temperatures while remaining resistant to oxidation have only partially succeeded.

High-Temperature Strength

Numerous attempts at producing silicon carbide refractory bodies with high hot strength, excellent resistance to oxidation, and strong thermal shock resistance have failed due to ineffective clay or other ingredients producing glassy bonds not being sufficiently resistant to oxidation resulting in strength being lost at operating temperatures.

The present invention provides a novel and improved refractory material comprising silicon carbide grains held together by silicon nitride bonds, with an exceptionally high modulus of rupture at 1350 deg. C which is approximately double that of existing high grade silicon carbide refractories on the market.

Duratec nitride-bonded silicon carbide brick is widely used in tunnel and shuttle kilns, and serves as an ideal side wall material for large prebaked aluminum electrolytic cells. It boasts excellent corrosion resistance against cryolite corrosion as well as superior bending strength. Furthermore, vibration pressing can be used to shape it before step high pressure nitration sintering is employed for firing it into shape.

High-Toughness

Nitride-bonded silicon carbide stands out among engineering materials as having one of the highest toughness values. It features an extremely strong mechanical strength as well as resistance to creep and oxidation at elevated temperatures; additionally, SiC gives outstanding fracture toughness, making this material perfect for applications requiring ceramic to resist impact and shock.

NBSiC is highly resistant to thermal shock. It boasts very high flexural strength at low temperature and can be formed into complex shapes using the Blasch process, while having excellent wear resistance and being easy to clean.

NBSiC stands up well against corrosion from cryolite and Copper slag and features excellent refractory properties that make it the ideal side wall material for large prebaked aluminum electrolytic cells. Furthermore, its very long campaign life demonstrates this property; when subjected to an accelerated oxidation test standard bonded silicon carbide bodies gain weight over time as their quality deteriorates over time – an indicator that they are deteriorating quickly.

High-Density

Nitride-bonded silicon carbide offers high density, making it suitable for applications where weight reduction is critical. Furthermore, its superior thermal conductivity saves energy when operating equipment with temperatures exceeding 120 deg.

NBSiC is produced by gelcasting an aqueous slurry containing coarse silicon carbide grains and fine silica particles together with a refractory binder such as mullite or magnesia, before shaping green shapes from it and heating treat in a nitrogen atmosphere where gaseous nitrogen reacts with silicon to form silicon nitride.

This reaction results in a product with a relatively high silica content and very little silicon nitride content, distinguished by a very high silicon bonding strength, excellent thermal shock and corrosion resistance, good resistance against alkali erosion, as well as good oxidation resistance – making it highly versatile for various industrial applications.

High-Conductivity

Nitride-bonded silicon carbide boasts superior thermal conductivity for efficient heat transfer and uniform temperatures across your production line, while its abrasion-resistance protects thermocouples from wear and tear, helping save on repairs or downtime expenses.

Nitride bonded silicon carbide has excellent chemical resistance against cryolite and copper slag corrosion, making it the ideal material to use on large prebaked aluminum electrolytic cells as side walls.

Nitride-bonded silicon carbide (NBC) is an advanced refractory composed of high grade SiC and industrial silica powder as its raw materials, formed into special-shaped products by vibration pressing, then sintered using step high pressure nitration sintering. NBC boasts numerous exceptional properties such as high strength at elevated temperatures, excellent toughness, low expansion rates, large thermal conductivity rates, small linear expansion coefficient and good abrasion resistance properties – ideal for use in steel, nonferrous metallurgy and ceramic industries alike compared with traditional silicon carbide slabs and cordierite mullite products which is lighter, stronger, nondeformed more energy-efficient thus saving kiln space and having longer lifespan over traditional silicon carbide slabs or cordierite mullite products.