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The automotive sector is one of the most important uses of sintered silicone nitride. For example, there are electric plugs in diesel engines that provide faster start-up, precombustion chambers that produce less emissions, lower start-up, and more noise and turbochargers. For spark ignition engines silicon nitride helps reduce wear rocker pads and turbocharger turbines reduce engine lag. Exhaust control valves increase acceleration.
An all-ceramic silicon nitride bearing does not just have ceramic components, it also has a ceramic hybrid bearing. For example, the ceramic ball and steel seat rings are made of silicone nitride. The silicon nitride clays offer superior shock resistance to other ceramics. Ball bearings constructed from silicon nitride ceramics have high-performance bearings. NASA’s main engine uses silicon-nitride bearings. Because silicon nitride balls bearings are more durable than metal, they have less contact with bearing tracks. This is a better alternative to traditional metal bearings. They can lower friction by as much as 80% and extend their service lives by 3-10 times. Silicium nitride is 79% lighter that tungsten caride balls. Silicon nitride bearings are used in automotive bearings of high quality, as well industrial bearings. They can also be used for racing, cycling, skateboarding, and roller skating. These bearings can be used in areas where metals cannot be used due to corrosion.
Since long, silicon nitride is used for high temperatures. Particularly, silicon nitride has been found to be one of the few integral ceramic material that is capable of withstanding severe thermal shocks as well as thermal gradients created by hydrogen / oxygen rocket engines. NASA scientists employed advanced rapid prototyping technology in order to produce one-inch combustion chamber/nozzle/thruster assemblies. This was done to demonstrate the capability of complex configurations. Five cycles were run on the thruster with hydrogen/oxygen propellant. The last cycle was a five-minute one to 1320°C.
There are many orthopedic uses for silicon nitride. It can be substituted for PEEK and titanium in spinal fusion devices. The materials’ strength, durability, reliability, and resistance are significantly higher than those of PEEK (polyether ketone) and titanium. It can be used in compositions that have antibacterial, antifungal and antiviral properties.
Tools for metal cutting and welding.
It is used in cutting tools because of its hardness, thermal stability, wear resistance and toughness. It is particularly recommended to high-speed cast iron machining. Sintered silicon Nitride can be used to machine cast iron, nickel-based alloys, and hard steel at 25 times the speed of conventional materials, such as tungsten caride. Manufacturing output can be greatly affected by the quality of cutting tools. The face milling process of gray cast steel with silicon nitride tips reduces cost by up to 50%, doubles cutting speed and increases tool life.
Silicon nitride has been used to make integrated circuits. This is done in order to electrically isolate the different components or for masking in bulk micromachining. Silicon nitride is an excellent passivation material for microchips. It has a much better diffusion barrier than silicon dioxide to both water molecules and sodiumions, which are the main causes of corrosion and instability within microelectronics. It can be used in an analog chip capacitor as a dielectric to separate polysilicon layer.
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