Silicon Nitride Ceramic Porcelain Nozzle
Aluminum oxide ceramics, silicon nitride ceramics, zirconia ceramics
Silicon nitride , the sub-formula is Si3N4, is an important structural ceramic material. It is a superhard substance, which has lubricity and wear resistance. It is an atomic crystal; it is resistant to oxidation at high temperatures and it can also resist cold and heat. Impact, heated to above 1000 ℃ in the air, rapid cooling and then rapid heating, it will not be broken. If the mechanical components such as rings and permanent molds are made of silicon nitride ceramics that are resistant to high temperature and not easy to transfer heat, the heating surface of engine parts can not only improve the quality of diesel engines, save fuel, but also improve thermal efficiency. China, the United States, Japan and other countries are all This kind of silicon nitride for diesel engine has been developed and used as advanced refractory material, such as SI3N4-SIC refractory material combined with sic for blast furnace body and other parts; such as SI3N4-BN material combined with BN, used for horizontal continuous casting separation Ring SI3N4-BN series horizontal continuous casting separation ring is a fine structure ceramic material with uniform structure, high mechanical strength, good thermal shock resistance, and will not be wet by molten steel, which meets the process requirements. The good performance of silicon nitride ceramic raw materials is mainly as follows: (1) high impact toughness, strength close to corundum, self-wetting and wear resistance; (2) high heat resistance, small linear expansion coefficient, excellent (3) The chemical properties are stable and can withstand strong radiation. The excellent properties of these silicon nitride ceramics are suitable for the high temperature, high speed, and strong corrosion environment often encountered by modern technology. The value of a unique commodity is very obvious.
(1) High impact toughness, strength close to corundum, self-wetting, wear-resistant indoor temperature tensile strength can reach 980MPa, can be compared with carbon steel, and compressive strength can be maintained until 1200 ℃ No reduction (2) Good heat resistance, small linear expansion coefficient, excellent heat transfer performance, so the thermal shock resistance is very good, and the thermal shock resistance from room temperature to 1000 ° C is not easy to crack (3) Organic chemical characteristics Stable, basically resistant to the corrosion of all strong oxidants (except HF) and sodium hydroxide (NaOH) aqueous solution with a concentration below 30%, and also resistant to the corrosion of many organic chemicals, for a variety of rare metal melts ( Especially aluminum liquid) is not wet, can withstand obvious radioactive irradiance (4) relative density is low, the ratio is small, only 2/5 of steel, and the dielectric strength is good.