While silicon nitride has been discovered since the mid-19th century, due to its covalent connection it can be difficult for manufacturers. Silicon nitride Ceramic is a high quality engineering ceramic. It has excellent mechanical properties, such as strength, toughness, fracture resistance, hardness and wear resistance. Silicon nitride (also known as polycrystalline composite) is made of single crystals of silicon and is embedded in the amorphous/partially crystalline glass phase matrix. Its properties vary not only from the inherent silicon-nitride properties but also depending on the size of silicon grains and their morphology. Si3N4’s mechanical, thermal, and physical properties are excellent and it can be used in both conventional and new ways. Si3N4’s lightweight, high bending resistance, wear resistance and endurance make it a viable alternative to stainless steel, titanium carbide and other oxide-based materials.
Automobile industry.
A major use of sintered Silicon Nitride is for automotive engine parts. They include precombustion rooms for less emission, faster startup and lower noise. There is also a turbocharger to lower engine emissions. The spark ignition engine uses silicon nitride to reduce the wear on rocker pads. It also serves to turbocharger engines to improve inertia.
Bearing.
It is an all ceramic bearing made with silicon nitride. However, this bearing also comes in a ceramic hybrid. In other words, the ball is ceramic while the seat ring, which is made out of steel, is a silicone nitride bearing. These ceramics exhibit good shock resistance, compared to other ceramics. For high-performance ball bearings, silicon nitride cermics are ideal. NASA space shuttle’s main engine is powered by silicon nitride. Contact with the bearing tracks can be reduced as silicon nitride-ball bearings is harder than traditional metal. This has the potential to reduce friction by 88%, prolong service life up to 3 to 10 years, speed up by 80%, decrease weight by 60% and run in inadequate lubrication. It is 79% lighter to carry a silicon nitride ball than a standard tungsten-carbide ball. Silicon nitride ball bearings may be used in automobile bearings of high quality, industrial bearings or wind turbines. They can also be used to power racing bikes, roller skates and scooters. Silicon nitride bearings prove to be particularly helpful in environments where corrosion and electric or magnetic field interferences prohibit metal use.
Materials with high temperatures.
The use of silicon-nitride in high temperatures has been a long tradition. This ceramic material is one of few that can withstand extreme thermal shocks and thermal gradients effected by the hydrogen / oxygen booster engines. NASA scientists applied advanced rapid prototyping technologies to build one-inch wide combustion chamber /nozzle (thruster), assemblies. The hot-tested thruster, which was filled with hydrogen / oxygen propellant, went through five cycles.
Medical profession.
Silicon nitride can be used for orthopedic purposes. The material also works as an alternative to PEEK, which is a polyether ether ketoone, and titanium used in spinal fusion. The material’s strength, durability, as well as reliability are enhanced by the micro-textured and hydrophilic surfaces of silicon. You may find antibacterial and/or antifungal properties in some compositions.
Use metalworking and cutting tools.
This material can be used as a cutting tool because it is hard, durable, and resistant to wear. High-speed casting iron machine machining is possible with the help of this nitride. Sintered silicone nitride is 25-times faster than conventional materials (tungsten carbide) in terms of surface speed, thermal toughness, and fracture toughness. It has an enormous impact on manufacturing productivity. When compared to traditional tungsten nitride tools, face milling grey cast iron with silicon-nitride blades doubles the cutting rate, improves tool life, and cuts 50% off the average blade price.
Electronic industry.
Silicon nitride serves two purposes: as an electrical barrier and an insulator in integrated circuit manufacture to electrically isolate diverse structures. Or as an ink mask in bulk micromachining. It’s a superior passivation layer in microchips than silicon dioxide, as it has a greater diffusion barrier to sodium ions and water molecules. These are the major causes of corrosion and instability within microelectronics. It also serves as the dielectric between layers of polysilicon in analog chip caps.
Silicon nitride Price
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