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Ceramic Technology

Have You Ever Heard Of Ceramic Engines

Time: 2019-03-05   Writer: mingrui

Have you ever heard of ceramic engines?

These ceramic engine advantages, the traditional engine is impossible to do!

In traditional diesel engine with metal parts, aluminum alloy heat-resistant limit is 350 ℃, steel and cast iron is 450 ℃, the best super heat close and complicate the engine design, increase the weight and cost a lot of power.For a long time, people have been looking for an ideal material to replace the metal material used in engines.

The major reform of engine materials is to replace metal parts with high performance ceramic parts gradually until the main parts of the engine. This is what people call ceramic engine.

Ceramic materials have many advantages.The hardness of ceramics is more than 1500HV, and the general synthesis of metal is about 400HV, and the ceramic insulation is very good.According to this characteristic of ceramics, making piston, connecting rod, cylinder liner, cylinder head and other key parts with ceramic materials will greatly improve the thermal efficiency of the engine by at least 35%.Ceramics have low density and light weight.Ceramic has the characteristics of corrosion resistance, not easy to oxidize at high temperature, and has good corrosion resistance.From this point of view, the range of fuel options will be greatly improved, you can choose poorer fuel quality fuel.From the drawing materials of ceramic materials, the main component of ceramics is silicate, which is very rich in resources.

In addition, the thermal characteristics of the ceramic material is very good, very high melting point, the metal melting point is 1400 ℃ or so commonly, and conventional ceramic above 2000 ℃, melting point at high temperatures has excellent chemical stability, thermal expansion coefficient of the ceramic is lower than metal at the same time, when the temperature changes, the ceramics with good dimensional stability.

Due to the ceramic at about 1400 ℃ temperature keep good stability, do not need to huge engine cooling system.Eliminating the cooling system can reduce the diesel engine volume by more than 40%.The reduction of diesel engine volume reduces the weight of the whole vehicle, thus improving the unit volume power, unit power and maneuverability.Fifty percent of failures in military vehicles are related to cooling systems, and reducing or removing cooling means improving engine reliability, serviceability, maintainability and durability.In addition, the piston working temperature can be increased by more than 300 ℃, greatly promote the burning of fuel and air mixture, burn more thoroughly, the fuel consumption and emissions are a huge benefits.

In summary, high performance ceramics have many better properties than metals, such as high temperature resistance, wear resistance, corrosion resistance, light weight and good thermal insulation performance, these special properties can make the traditional engine facing low thermal efficiency and complex structure and many other problems can be reasonable solution, and improve the performance and durability of the engine.Therefore, some experts believe that high-performance ceramics are the most encouraging new development of the internal combustion engine, which will finally solve the problem of the engine to work in harsh conditions.In the 21st century, there will be many ceramic engines.Initially, ceramic coatings and monolithic ceramic engine parts were studied and used.Ceramic coating technology is mature, low cost, high life, the use of plasma coating zirconia, titanium carbide and titanium dioxide and other ceramics, to obtain a durable coating within 1 mm.To solve the problem of ceramic coating being too thin, monolithic ceramic parts made of zirconia, silicon nitride, silicon carbide and aluminum titanate are studied.In addition, glass ceramics, alumina and other integral ceramic parts are also studied.

 


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