Ceramic is an organic material ceramic that does NOT shrink when sintered. Silicon nitride is extremely strong, especially when hot-pressed. This is why it is considered one of the strongest materials on the planet. It has high strength and low density.
Silicon Nitride Ceramic Preparation
Si3N4 ceramics can be prepared using a variety of methods, including hot pressing, atmospheric, pressure, and hot press sintering.
Reaction sintering method (RS)
It follows the standard forming procedure. First, the silicon powder must be pressed into a desired shape. Then it will go into a nitriding furnace to undergo pre-nitriding or partial nitriding before being sintered. The pre-nitrided green bodies already have a certain strength. There are many mechanical processes that can be done to the green body, including turning, milling, and drilling. To obtain a product with minimal dimensional changes, the temperature must be above the melting points of silicon.
Hot Press Sintering
It uses Si3N4 Powder and small amounts of additives (such MgO or Al2O3, MoF2, Fe2O3, etc.). It is pressed at above 1916 MPa, and heated to 1600 degrees for hot press molding or sintering. Si3N4 ceramics made by hot pressing are superior to those of Si3N4 that has been reaction sintered. They have high strength and density.
Atmospheric pressure-sintering method (PLS).
To increase the pressure of the sintering atmosphere nitrogen atmosphere, it uses Si3N4’s properties to raise the decomposition temperature (usually at 1atm N2 starting at 1800degC). After atmospheric sintering has been completed at temperatures between 1700-1800°C, air pressure is then applied to the temperature range 1800-2000°C.
Method of air pressure sintering (GPS).
At a pressure of 1-10 MPa and at temperatures of approximately 2000°C, silicon nitride can be air pressure sintered. The high nitrogen pressure prevents silicon nitride from decomposing at high temperatures. It is possible to produce a high-toughness ceramic by using high temperature sintering with less sintering tools. The result is a high-temperature ceramic with long columnar grain growth and in-situ density > 99.
Silicon Nitride Ceramic Application
Silicon nitride Ceramics have exceptional mechanical properties, wear resistance corrosion resistance and other outstanding properties. This makes them widely used in many industrial areas such as metallurgy machinery energy and energy: semiconductor, chemical, aerospace and so forth.
Silicium nitride ceramics in mechanical engineering can be used to produce bearings. Cutting tools, high-temperature bolts. Drawing dies. Ball valves. Plungers. Sealing materials. Nozzles.
Hot-pressed silicon nitride ceramic tool have a 5-15x higher durability than cemented carbide and a 3-10x higher cutting speed. Dispersion strengthening can be used to increase the performance and longevity of silicon-nitride tools by compounding TiC or ZrC.
Silicon nitride clay has excellent mechanical properties. It is both wear-resistant and self-lubricating. It is an excellent bearing material with a longer service life than other ceramic ones. It can withstand extreme temperatures and corrosion.
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