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Is Si3N4 Ceramic Harder Than Diamond

Is there a harder substance than any other? We all think about diamonds. You may not realize that ceramics could also be one of the hardest substances in the universe. This article introduces silicon nitride (Si3N4) ceramics. They are strong and especially hard-pressed, making them one of the strongest substances on the planet. This ceramic is high in strength and low in density. It also has resistance to high temperature.

Covalent bond compounds are Si3N4 ceramic. Si3N4 ceramic is a covalent bond compound. The central silicon atom is located within the Tetrahedron. The tetrahedron has four nitrogen-atom atoms surrounding it. These are found at its four vertices. Each tetrahedron shares the shape of an atom. They form a three-dimensional stable and continuous network structure.

The structure of silicon nitride is responsible for many of its properties. Pure Si3N4 has a crystal structure of 3119. Both a and b are hexagonal. Its melting point is 1800 degrees Celsius in air, and 1850 degrees Celsius in 110MPa Nitrogen. Its thermal shock resistance is outstanding because Si3N4’s low thermal expansion factor and high thermal conductivity. Even after heating to 1000°C, hot-pressed sintered silica nitride won’t crack. Si3N4 can withstand more impact and strength at low temperatures.

However, the increased service time of above 1200 will cause it to break, which will result in a decrease in its power. You will see more fatigue damage if Si3N4 exceeds 1450. In areas that need materials with high strength and low density as well as high resistance to high temperatures, Si3N4 ceramics can be replaced with alloy steels. This is it.

Si3N4 ceramic material is highly suitable for high-temperature applications. It can withstand high temperatures without melting and maintains its strength to 1200°C. When heated it does not melt. It cannot be decomposed before 1900°C. It can withstand nearly all Inorganic acid solutions and caustic sodium solution below 30%. Additionally, it can resist many organic acids’ corrosion.

Si3N4 ceramics’ future direction is:

1. Si3N4 has many great characteristics.

2. When Si3N4 powder gets sintered, research and control its composition.

3. Optimize the milling, shaping and sintering of your processes

4. In order to create high-performance composites, make use of Si3N4/SiC materials.

Silicon nitride ceramics use silicon powder as their raw material. The powder is formed by using ordinary molding methods to achieve the desired shape. At 1200°C, initial nitriding in nitrogen is done. Some of the silicon powder reacts strongly with nitrogen and forms silicon nitride. This gives the whole body a special strength. A second nitriding process is then performed at high temperatures between 1350 and 1450 degrees C. This reaction forms silicon nitride. You can produce silicon nitride by hot pressing sintering with a theoretical density of 99.

Si3N4 ceramic’s lightweight and toughness can be used in the manufacture of ball bearings. Ceramic has a higher level of accuracy than steel bearings. It also generates less heat and is able to operate at higher temperatures. It can operate at higher temperatures and in corrosive media and has a higher efficiency than traditional metal bearings.

Si3N4 ceramic has the unique characteristics of wearing resistance and heat resistance. It can also be used in a boiler of 650 for several months without visible damage. Other heat-resistant or corrosion-resistant alloy steel steam nozzles are only good for about 1-2 months.

Chinese scientists developed the Si3N4 ceramic glowplug to solve cold-starting problems. This plug is available for either direct injection or indirect injection engines. This is the perfect ignition device to use with engines.

Japanese researchers developed a new rough pump using a pump housing that contains 11 Si3N4 ceramic rotating rotors. It can run normally with no cooling or lubrication because it uses a Si3N4 clay rotor. A vacuum system can be created by combining this pump with an ultra-vacuum pumps such as turbo molecular pumps.

Here are some examples of Si3N4-based ceramics used as structural materials. Si3N4 ceramics with improved performance and reliability in powder, molding and sintering will become more popular.

Si3N4 as an engineering ceramic is gaining prominence due to its improved purity and rapid development in mold technology and sintering technology.

Si3N4 Ceramic has outstanding comprehensive properties, abundant resources, makes it an ideal high temperature structural material. There are many markets and applications for Si3N4 ceramic, which countries from all around the world are eager to develop and research. Ceramic Si3N4 materials possess the properties of wear resistance. These characteristics are comparable to general metals.

The 21st century’s pillar industries will be supported by silicon nitride clay, which has been a key material after polymers and metals. This has made it one of the most important research areas. Their research and development is a priority for countries all over the globe.

Si3N4 ceramics, an indispensable member of the high temperature structural ceramic family, have greater mechanical and thermal properties as well as chemical stability than any other high-temperature ceramics, such as carbide and oxide ceramics. This makes Si3N4 ceramics the most promising in high-temperature structure ceramics.

Si3N4 ceramic, which is a ceramic with exceptional performance and advancing basic research, will become more popular.

Mis-asia, Misasia advanced material Tech Co., Ltd., a leading Si3N4 producer, has over 12 years’ experience in chemical product research and development. We can provide high-quality Si3N4 powder.

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