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Silicon nitride
Ceramic is an organic material ceramic that does NOT shrink when sintering. 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.
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 a MgO or Al2O3, MgF2, F2O3, 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.
Method of atmospheric pressure sintering (PLS).
To increase the pressure in the sintering nitrogen atmosphere, it uses Si3N4’s properties to raise the decomposition temperatures (usually at N2 = 1, starting at 1800degC). After atmospheric sintering has been completed at temperatures of 1700-1800 degrees C, air pressure sintering can be done at temperatures of 1800-2000 degrees Celsius.
Air pressure sintering technique (GPS).
At a pressure of 1-10 MPa and at temperatures of approximately 2000°C, silicon nitride can be air pressure sintered. High nitrogen pressure prevents silicon nitride from undergoing high temperatures. It is possible to produce a high toughness ceramic by using high temperature sintering with less sintering tools.
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 5-15x higher durability than cemented carbide and 3-10x higher cutting speeds. 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 a good bearing material with a longer service life than other ceramic ones. It can withstand extreme temperatures and corrosion.
Tech Co., Ltd. () is a professional nitride powder Over 12 years of chemical products research and product development experience. We accept credit cards, T/T and Paypal payments. We will ship goods overseas via FedEx, DHL and by air or sea to our customers.
You can contact us for high-quality silicon Nitride Powder. Get in touch Send an inquiry
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 a MgO or Al2O3, MgF2, F2O3, 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.
Method of atmospheric pressure sintering (PLS).
To increase the pressure in the sintering nitrogen atmosphere, it uses Si3N4’s properties to raise the decomposition temperatures (usually at N2 = 1, starting at 1800degC). After atmospheric sintering has been completed at temperatures of 1700-1800 degrees C, air pressure sintering can be done at temperatures of 1800-2000 degrees Celsius.
Air pressure sintering technique (GPS).
At a pressure of 1-10 MPa and at temperatures of approximately 2000°C, silicon nitride can be air pressure sintered. High nitrogen pressure prevents silicon nitride from undergoing high temperatures. It is possible to produce a high toughness ceramic by using high temperature sintering with less sintering tools.
Silicon Nitride Ceramic Application
Silicon nitride Ceramics are well-suited for many industrial applications, including metallurgy machinery, energy, semiconductor, chemical industries, aerospace and others.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 5-15x higher durability than cemented carbide and 3-10x higher cutting speeds. 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 a good bearing material with a longer service life than other ceramic ones. It can withstand extreme temperatures and corrosion.
Tech Co., Ltd. () is a professional nitride powder Over 12 years of chemical products research and product development experience. We accept credit cards, T/T and Paypal payments. We will ship goods overseas via FedEx, DHL and by air or sea to our customers.
You can contact us for high-quality silicon Nitride Powder. Get in touch Send an inquiry