Sintered silicon carbide offers exceptional wear resistance and chemical corrosion properties, along with low friction coefficient, oxidation resistance and temperature stability. Furthermore, these SSiC products feature low friction coefficient and offer temperature stability over an extended lifespan.
These qualities make silicone rubber an excellent material choice for mechanical seals in pumps and compressors as well as components that handle corrosive media such as abrasives or corrosion inhibitors. Furthermore, its strength allows it to withstand high velocity projectiles used against bulletproof vests.
Corrosion Resistance
Corrosion resistance is one of the key properties sought after by ceramic materials. Sintered silicon carbide boasts excellent resistance against phosphoric, sulfuric and nitric acids – making it a suitable material for steam turbine cylinder linings in environments exposed to aggressive acids.
Pressureless sintered silicon carbide stands out from its reaction bonded counterpart in terms of purity, mechanical properties and corrosion resistance (it’s the only ceramic material capable of withstanding hydrofluoric acid corrosion). Furthermore, its superior chemical stability means it’s less vulnerable to degraded effects of an aggressive environment.
Sintering, additives and densification techniques of sintered silicon carbide have been extensively researched. Numerous sintering processes have been developed such as reactive sintering, gypsum-slurry casting, liquid phase sintered silicon carbide with oxide activating additives formed via hot isostatic pressing as well as hot isostatic pressing; spark plasma sintering, flash sintering and oscillatory pressure sintering have all been added over the past two decades to further advance these methods further.
Wear Resistance
Silicon carbide ceramic is one of the strongest and hardest materials on Earth, being fifty percent harder than its tungsten carbide counterpart and resisting mechanical abrasion at high temperatures and in harsh environments.
Chemical resistance makes this material ideal for applications in 3D printing, ballistics, paper manufacturing and energy technology. Even strong acids such as sulfuric, nitric and hydrochloric acids cannot damage this product.
Pressureless sintered silicon carbide offers greater flexural strength and thermal conductivity compared to reaction-bonded silicon carbide, allowing it to withstand temperatures as high as 1,800 degC (3,272 degF with protection gas).
Sintered silicon carbide from ATT is produced using highly pure and ultra-fine silicon carbide powder combined with just a small amount of sintering aid and then sintered at temperatures ranging between 19502100degC to produce strong ceramic particles with typical grain sizes of 1.5mm. This process is much more cost-efficient than reaction-bonded SiC, which requires higher temperatures and additional sintering additives.
Thermal Conductivity
Sintered silicon carbide cylinder liners have the capability of significantly reducing engine friction by 30-50% and improving fuel efficiency by 20%, as well as providing superior wear resistance, corrosion protection, heat tolerance, thermal conductivity and thermal conductivity properties.
Hexoloy SP SiC is an excellent material to use when it comes to mechanical seal faces, offering optimal performance in various chemical environments and sliding friction conditions. It is resistant to acids like phosphoric, sulphuric and nitric acids as well as various solvents.
Hexoloy SP SiC stands out from other ceramic materials with its discrete and non-interconnecting pores that produce exceptional friction properties compared to others, which make for exceptional air and product lubrication performance as well as rapid cooling without steam pockets forming, thus prolonging its life and increasing performance in applications where air lubrication or product lubrication may be used. Furthermore, Hexoloy SP SiC’s higher fracture toughness results in stronger and more durable material which can be machined using precision diamond grinding techniques.
Strength
Silicon carbide is one of the hardest and strongest ceramic materials, capable of withstanding intense corrosion and wear, thermal shock resistance, and maintaining its strength even at higher temperatures. Due to these characteristics, it is an excellent material choice for mechanical seals and pump parts exposed to chemical, abrasive or corrosive environments.
Sintered silicon carbide is made by sintering, which combines extremely fine a-SiC powder with special additives and the sintering process is conducted at very high temperatures under vacuum or an inert atmosphere in order to create extremely dense products that can later be machined through casting, extrusion, cold isostatic pressing or injection molding.
Morgan’s PGS-100 silicon carbide material combines course grained reaction bonded material with free graphite for increased chemical and abrasion resistance, improved lubricity and greater pressure velocity capability between hardface mating pairs.
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