Nitride Bonded Silicon Carbide Offering Enhanced Wear Resistance and Durability

Nitride-bonded silicon carbide has proven itself in numerous demanding industrial applications. It possesses an uncommon combination of characteristics including mechanical strength, thermal stability and chemical resistance – characteristics which set it apart from its competitors.

Reaction-bonded silicon carbide can be cast into intricate and precise forms using the Blasch process, offering superior refractoriness and chemical properties.

Enhanced Wear Resistance

Nitride-bonded silicon carbide (NBSC), one of the advanced ceramic materials, stands tall among its peers as a material capable of withstanding extreme thermal, mechanical and chemical conditions. From its creation to widespread applications it stands as testament to humankind’s ingenuity and persistence in search of materials capable of withstanding Mother Nature.

Nitride-bonded silicon carbide’s exceptional wear resistance is determined by its ability to resist friction between abrading and abrasive surfaces, and wear is minimal even under strong, constant forces of abrading; in fact, its wear can often outlive steels and padding welds used to construct soil working parts.

NBSC ranks among the highest hardness values among engineering materials, making it exceptionally resistant to impact or abrasion from hard particles and surfaces. Reaction bonded versions have been specially engineered for optimal strength, long life span and chemical resistance as well as casting into intricate shapes without structural damage or oxidation occurring at elevated temperatures.

Enhanced Thermal Stability

Nitride-bonded silicon carbide is a hard, chemically inert material with exceptional fracture toughness and thermal shock resistance, boasting a Mohs hardness of 9. This makes it one of the hardest materials available in engineering ceramics; furthermore, its hardness provides high levels of abrasion resistance from sharp particles or surfaces as well as reduced friction between mating surfaces.

Nitride-bonded silicon carbide showed superior wear resistance in light soil conditions when tested, outperforming steels and padding weld commonly found in metal-mineral tribological pairs. However, its wear rate significantly diminished in heavy soil environments when loose abrasive grains from beneath became trapped between top and bottom layers of material.

Reaction bonded silicon carbide provides superior wear resistance and oxidation resistance, as well as being capable of being formed into intricate shapes that cannot be achieved using other mixtures. This is achieved by infiltrating formed parts with silicon carbide and carbon with metallic silicon to form SiC-to-Si3N4 bonds and fill the remainder of pore volume voids; this process is extremely stable without shrinkage issues, making large parts with precise dimensions possible to produce.

Enhanced Corrosion Resistance

Nitride-bonded silicon carbide has an exceptional thermal shock resistance and can handle rapid changes in temperature without cracking or fracture. As such, it makes an ideal material choice for applications requiring high levels of durability such as aluminum furnace linings and kiln furniture for producing nonferrous metals.

NB SiC offers excellent chemical resistance to acids and other harsh chemicals, which can greatly extend component service lives in harsh environments. By adding graphite into its formulation, NB SiC further improves its tribological properties to further increase wear resistance even under challenging abrasive conditions.

It was determined that NB SiC material exhibited much better abrasive wear resistance than steels and padding welds used in soil working parts, particularly light soil environments. In comparison to XAR 600 steel, its wear intensity in light soil conditions was nine times less intense and three times lower in heavy soil environments.

Enhanced Chemical Resistance

Nitride-bonded silicon carbide boasts outstanding strength, thermal stability and chemical resistance at elevated temperatures. Additionally, it remains chemically stable when exposed to oxidizing conditions, such as those encountered when handling non-ferrous metals such as aluminum or working with acids and other harsh chemicals.

NB SiC can also withstand wetting from non-ferrous metals and has ideal refractory properties, making it suitable for many different environments and enabling casting into complex shapes of various sizes and forms.

Nitride-bonded silicon carbide was shown to outperform boron steel across all soil types tested, with its wear rate being up to three times that of XAR 600 steel and 1.5 times greater than F-61 padding weld in light soil containing loose sand particles.

Onex offers Black Diamond Nitride Bonded Silicon Carbide (NBSiC), to replace steel in furnace and kiln furniture such as saggers, muffle sections, exhaust sacks and abrasion sleeves in furnaces and kilns. This material is superheated in nitrogen atmosphere to provide superior dimensional control and uniform properties of properties across pieces of this furniture.