Silicon Nitride Powder Property
Silicon nitride (Si3N4)
A covalent bonding compound made of silicon and nitrate. It was first discovered in 1857. In 1955, it was made into a mass-produced ceramic material. Silicon nitride clays offer many benefits that other materials, including metals and polymers, like high resistance to heat (bending strength of 350MPa at 1200), resistance to acid and alkali corrosion, self-lubrication, etc. These ceramics can be found in many areas, including aerospace and national defense.
Preparation The use of Silicon Nitride Ceramics
To prepare silicon-nitride ceramic material, it is necessary to first obtain silicon powder. Then, molding, sintering, and other processes are used to produce the required silicon nitride. There are three main ways to prepare the silicon nitride powder: liquid phase reaction, powder nitriding and self-propagating high temperatures synthesis.
There are three primary forming methods for silicon nitride ceramics: cold isostatic, dry, and tape pressing. Meanwhile, the major sintering processes include hot pressing sintering (hot isostatic pressing), spark plasma sintering, and air pressure sintering.
Silicon Nitride Ceramics Applications in Mechanical Industry
Silicon nitride Ceramics are used primarily as pipes, valves and tools for the mechanical industry. Most commonly, silicon nitride-carrying balls is used.
When in use, silicon nitride bearing balls can reach speeds of 600000 revolutions/minute. They are mainly used for precision machine tool spindles, high-speed motorized spindle bearings, aircraft engines, automobile engine bearings, and other equipment bearings.
The advantages of silicon nitride ceramic bearings ball over steel balls are: high density, low temperature resistance, self-lubrication, corrosion resistance and low density. Ceramic balls are high-speed rotating bodies that produce centrifugal pressure. The low density silicon nitride lowers the stress placed on the outer rotating ring.
Dense Si3N4 ceramics have high fracture toughness, high modus, self-lubricity and self-lubricity. This allows them to withstand various wear conditions, such as extreme temperature differences and ultra high vacuum. These bearings will likely be used widely in many industries.
Silicon Nitride Market Analysis
American, European, and Japanese enterprises still control the high-end production of silicon nitride clay products. Well-known foreign companies still control the international market share as well as leading forces in development direction. Most representative are Toshibx Seridan (Japan Kyocera), Toshibx Seridan (CoorsTek) and British Sailon.
According to MARKETSANDMARKETS global market research, the worldwide market for silicon nitride is expected to grow at a compound annual rate of 5.8% over the 2020-2027 analysis period. The market is projected to grow from $1.4million in 2020 to $149 million by 2027.
Price is affected by many things, such as the demand and supply in the market and industry trends. Economic activity and market sentiment are also important.
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