However, they are just a new breed of friction material.
Among the problems in the development of China’s piezoelectric ceramic sheet industry, many situations are not optimistic, such as the severe impact of the global financial crisis on the irrational industrial structure and the concentration of labor-intensive products; the technology-intensive products lag significantly behind the developed industrial countries; The decisive role of production factors has gradually weakened; large industrial energy consumption, low output rates, severe environmental pollution, and destructive enhancement of natural resources; the overall scale of enterprises is small, technological innovation capabilities are insufficient, and management levels are lagging behind. New varieties of friction materials In the field of friction materials, the types of brake pads used for different regions, different models, and different environments are also different. At present, there are four major types of friction materials coexisting internationally: semi-metal, low-metal, ceramic, and organic. The four major categories have their own advantages and disadvantages, and each category is divided into high, medium and low grades. Ceramic brake pads, as a new type of friction material, have the advantages of noise, no dust fall, non-corrosive wheels, long service life, and environmental protection.
Piezoceramic brake pads have many advantages, but they are just a new breed of friction material, not a substitute for traditional brake pads. At present, because of the greater focus on car handling and higher requirements for brake sensitivity, most European car manufacturers, including Mercedes and BMW, still use traditional low-metal brake pads. It is reported that in recent years, European automobile manufacturers have also started to demand ceramic brake pads. However, due to the different friction methods between low metal brake pads and ceramic brake pads, European cars must be equipped with relevant parts of the car to assemble ceramic brake pads. Big changes. Of the brake pad products currently exported, more than 60% are semi-metallic brake pads, and ceramic brake pads occupy less than 10% of the market. Experts and industry insiders pointed out that although domestic brake pad companies have made some progress in the production and development of various types of brake pads, compared with foreign ceramic brake pads, this progress is only a certain point of progress, not comprehensive. improvement. In recent years, domestic mainstream brake pad companies have made breakthroughs in the research and development of high-end ceramic brake pads, marking that China’s leading brake pad companies have stepped more firmly into the high-end market.
There are no mileage and age regulations for the replacement of brake pads. Under normal driving conditions, the service life of the front brake pads is 2-4 km, and the service life of the rear brake pads is 60,000-100,000 km. However, it is also possible to use 50,000 kilometers in this car, and it must be replaced in another 30,000 kilometers, which depends on the specific conditions such as vehicle model, vehicle weight, and driving habits of the owner. If you are driving on a road with frequent traffic jams, then you are bound to brake frequently, so that the brake pads will wear more. If you often drive on such roads, the brake pads on your vehicle may be replaced frequently. There are also long-term brake pads for cars driving on urban roads that are longer than driving on highways; driving on mountain roads is shorter than driving on flat roads, and brake pads for trucks are shorter than cars. In fact, the life of the brake pads cannot be accurately estimated. You can only know if you check it frequently to see how worn it is.
The characteristics of the conductive layer of the piezoelectric ceramic heating element make the working voltage of the components made of it can be 220V, 110V, 36V, 12V, 7.2V and any other voltage level. Therefore, its components can be widely used in industrial production and can also be used. The heating plate and the heated surface of household appliances and electronic equipment must be coated with high-temperature thermal conductive silicone grease and pressed with a suitable elastic metal plate. The pressure must not be too large, otherwise the heating plate will be easily broken due to the mismatch of the expansion coefficients. . The lead-out wire of the heating sheet should be covered with a Teflon insulation sleeve, and the solder joints should be wrapped tightly with high-temperature insulation tape. When the heating plate is working, a temperature control device should be installed. The temperature sensor should be as close to the heating plate as possible, or the temperature of the MCH’s own resistance can be directly controlled.