As we all know, cars are products with extremely harsh working environment and working conditions, so the various parts that make up this behemoth must have excellent use functions. Currently, the use of zirconia ceramic structural parts in automotive parts is very common.
Zirconia ceramic temperature sensor housing
Zirconia ceramic oxygen sensor has high mechanical performance and reliability. As a component of exhaust gas purification, it can be used to determine the concentration of O2 in automobile exhaust gas, and then feedback the measured value to the engine air supply and fuel supply system. Keep the fuel in a state of complete combustion. Since all phases of this ceramic material are completely cubic stable zirconia, tetragonal zirconia and partially stable mixed monoclinic crystals, the mechanical properties during use are very superior and the heat generated by friction can be reduced.
In order to make the engine burn out completely when starting, a heating device, namely a valve heater, is installed on the intake side of the engine to heat the intake air and complete the evaporation and mixing of fuel. In order to control the temperature and improve the reliability of the equipment during suction heating, a barium titanate ceramic PTC (thermistor) is used as a valve heater. By using ceramic valve heaters, the engine is in a state of complete combustion after starting, so as to achieve the effects of improving thermal efficiency, saving energy and purifying exhaust gas. The valve heater is made of a special ceramic material.
With the application of special ceramics in automobiles, the existing piston engines that have been popular and promoted will have auxiliary combustion chambers, cylinder heads, cylinder liners, cylinder heads, supercharged rotors and other features. All these parts are considering the use of special ceramic materials, such as silicon nitride, silicon carbide and partially stabilized zirconia. The mechanical strength requirements here are: the bending strength reaches 50kg/mm2 or more, and the thermal expansion coefficient is 3.510-6°C
Basically, the above materials can meet these requirements, especially the partially stabilized zirconia ceramics, which not only has a mechanical strength of up to 100kg/mm2, but also has a thermal conductivity of only -0.04/cmsc. With other materials.
As far as gas turbine engines are concerned, to achieve the same fuel cost as diesel engines, the turbine inlet temperature of the car must be as high as 1350C. Only silicon carbide and silicon nitride ceramic materials can withstand this high temperature. At present, experts have high expectations for this and believe that the above-mentioned ceramic materials are the most ideal choice for turbine rotors and stators. In the future, ceramic motors are very likely to be combined with silicon nitride and silicon carbide ceramics or partially stabilized zirconia ceramics.
High-end automotive shock absorber: It is a smart shock absorber successfully developed by using the positive piezoelectric effect, inverse piezoelectric effect and electrostrictive effect of sensitive ceramics. This type of smart shock absorber has the function of recognizing the road surface and being able to adjust itself. It can minimize car vibration on bumpy roads and make passengers feel comfortable.
Smart ceramic cleaner: This cleaner is made of the pressure-sensitive effect of barium titanate ceramics. It can automatically detect the amount of rain, and can automatically adjust the car wiper to the best speed. Some other ceramic sensing elements, such as those made of heat-sensitive, pressure-sensitive, moisture-sensitive and magnetic-sensitive ceramic materials, can also display sensitive displays and automatically control the settings of temperature, humidity, condensation and antifreeze.
In addition, many devices, parts and small devices used in automobiles are also made of special ceramic materials. Such as electronic buzzer, ultrasonic vibrator, heat-absorbing glass, photoelectric tube, oil plug ring, oil-water seal, etc. These automotive products made of new special ceramic materials usually have high physical and chemical properties, such as impact resistance, wear resistance, corrosion resistance, high temperature resistance, light weight, and easy processing and production.