Tag: sintering

Silicon Nitride Ceramic Preparation And Application

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.

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)
The following is the method of forming it. 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 of the sintering atmosphere nitrogen atmosphere, it uses the properties Si3N4 for decomposition temperature. Usually, N2 = 1atm is used, with a minimum of 1800degC. After atmospheric sintering has been completed at temperatures between 1700-1800degC and then air pressure sintering can be done at temperatures between 1800-2500degC.

Air pressure sintering technique (GPS).
At a pressure of 1-10 MPa and at temperatures of approximately 2000 degrees 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.

Silicon Nitride Ceramic Application

Silicon nitride Ceramics are well-suited for many industries, including metallurgy machinery energy and machine, aerospace, chemical industry, 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 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 is resistant to corrosion and high temperatures, and can be used in harsh environments.

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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 […]

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Aluminum Oxynitride Price

Transparent aluminum oxynitride price

A translucent ceramic material with exceptional strength and low weight, it can be fabricated into plates, bowls, rods, tubes, domes, semiconductors, sensors, and even in cell phone protector screens to protect against damage when dropped. It also offers a high level of optical transparency in the ultraviolet through mid-infrared wavelength ranges that can be used for military applications and commercial applications like transparent armor, blast-resistant windows, seeker domes, and military infrared optoelectronics.

Aluminium oxynitride is a polycrystalline transparent ceramic with excellent mechanical properties and high light transmittance. It has a hardness four times that of quartz glass and can withstand temperatures up to 1200 degrees Celsius.

It’s tougher than titanium and stronger than bulletproof glasses, which is why it’s used in transparent armour applications for a wide range of defence and industrial uses. It’s also lighter than traditional bulletproof glasses and can stop a 50 calibre rifle round, making it perfect for blast-resistant windows, seeker domes, military infrared optoelectronics, and other applications where a tough, strong, transparent ceramic is needed.

Sintering Method for Producing an Aluminum Oxynitride Body

To produce an aluminum oxynitride body, precursor powders are mixed and sintering aids are added. Sintering aids are used to increase the rate of reaction and to control a temperature in the sintering process. The sintering process is then performed in a sintering chamber.

A small amount of doping additive may be added at this stage or later. In either case, the total amount of doping additive must not exceed 0.5% by weight of the green body during the sintering step.

Transparent aluminum oxynitride priceA translucent ceramic material with exceptional strength and low weight, it can be fabricated into plates, bowls, rods, tubes, domes, semiconductors, sensors, […]

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