Why silicon nitride is an important structural ceramic material
What is silicon nitride?
Silicon nitride is a vital architectural ceramic product with high solidity, lubricity, and also wear resistance. It is an atomic crystal that stands up to oxidation at heats. It can also stand up to cold and warm shocks. It can be warmed to even more than 1000 ℃ in air, cooled dramatically, and afterwards warmed wisely without breaking. It is specific since silicon nitride porcelains have such outstanding characteristics that people typically use it to produce bearings, wind turbine blades, mechanical seal rings, Long-term mold and mildews, as well as various other mechanical elements. Expect silicon nitride ceramics that are immune to heats as well as not simple to heat transfer are made use of to make the heating surfaces of engine parts. Because situation, it can improve the top quality of center extract engines as well as conserve fuel and thermal effectiveness. China, the USA, Japan, as well as various other countries have actually developed center distillate engines.
The production method of silicon
nitride There are two production methods of silicon nitride ceramic products, particularly response sintering and also warm pressing sintering. The response sintering method is to create silicon powder or a blend of silicon powder and also silicon nitride powder according to the general production technique of ceramic items. Then, in the nitriding heater, pre-nitriding is executed at 1150 ~ 1200 ℃. After acquiring a certain stamina, machining can be performed on the equipment tool. Then, more nitriding is performed at 1350 ~ 1450 ℃ for 18 ~ 36h up until the products become silicon nitride. By doing this, the product size is precise, and also the quantity is steady. The hot pressing sintering method is to incorporate silicon nitride powder with a little number of additives, such as MgO, Al2O3, MgF2, AlF3, or Fe2O3, Under the stress of 19.6 MPa or over and also a temperature of 1600 ~ 1700 ℃, the items made by hot pressing sintering are typically denser. They have much better properties than those made by reaction sintering.
Key applications of silicon nitride
Silicon nitride is made use of as sophisticated refractories, such as SI3N4-SIC refractories incorporated with sic for blast heating system stack, as well as other parts, such as SI3N4-BN materials integrated with BN for horizontal continual spreading splitting up ring. The SI3N4-BN collection flat continual spreading splitting up ring is an appropriate ceramic material with a consistent structure, high mechanical stamina, great heat resistance, and also impact resistance. It will not be moistened by fluid steel, meeting the process needs of continuous casting. On top of that, silicon nitride ceramic products have high thermal stability, solid oxidation resistance, and also high dimensional precision. Silicon nitride is a covalent substance with a high bond stamina and can develop an oxide protective film in the air, so it additionally has great chemical stability. It will not be oxidized below 1200 ℃. The protective film produced at 1200 ~ 1600 ℃ can prevent further oxidation and also will not be saturated or rusted by molten steels or alloys such as aluminum, lead, tin, silver, brass, and also nickel. Still, it can be damaged by molten solutions such as magnesium, nickel-chromium alloy, stainless steel, etc Price of
Silicon nitride bit dimension and purity will impact the item'' s Cost, and the acquisition volume can also impact the price of silicon nitride. A huge amount of large quantity will certainly be reduced. The Rate of silicon nitride can be found on our company'' s main site.
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