In recent years, widely used in aerospace technology in the ceramic thin film coating technology began to be used car. This technique has the advantage of better insulation and can withstand high temperature and high pressure, process maturity, quality and stability. To achieve the goal of low-heat, the engine combustion chamber can be sprayed ceramic components, such as zirconia spray piston, cylinder liner sprayed zirconia. DU bushing After this processing engine can reduce heat loss, reduce the quality of the engine itself, reducing the engine size, reducing fuel consumption.
Classification and characteristics of ceramics
Performance ceramics by two factors. The first is the structure of matter, mainly the nature of chemical bonds and crystal structure. They decide the Mould guide plate performance of ceramic materials, such as heat resistance, semiconducting and insulating and so on. Followed by microstructural, including distribution, grain size, shape,plasic bushing pore size and distribution, impurities, defects and so on.
Ordinary ceramic
Ordinary ceramics is clay, feldspar, quartz as raw materials, preparation, sintering. Such ceramic hard, will not rust oxidation, corrosion-resistant,plain bearing non-conductive, the ability of certain high-temperature processing formability, low cost, but lower strength. Normal maximum temperature not exceeding 1200 degrees Celsius,brass bushing these ceramic yield, variety, widely used in electrical, chemical and other industries.
Alumina ceramic
Alumina, also known as alumina ceramics, the main component is aluminum oxide and silicon oxide. Its strength, hardness, corrosion resistance, good insulation, heat resistance up to 1600 degrees Celsius, but the drawback is brittleness, poor seismic, process complexity and high cost. Alumina ceramic high-temperature performance and excellent dielectric properties make it suitable for production of engine spark plugs; good wear resistance of the piston can be made to ensure the process to very high accuracy and roughness.
Silicon carbide ceramic
Silicon carbide ceramics with silicon carbide powder, powder metallurgy sintered by reaction sintering or hot pressing process is made. Largest silicon carbide ceramic is characterized by high temperature strength, thermal stability, wear resistance, creep resistance. Used for casting metal hose nozzle, thermowell, gas turbine blades, bearings and other parts. At the same time because of its high thermal conductivity, but also for high temperature heat exchanger material can also be used to produce a variety of pump seals.
Silicon Nitride Ceramics
Rich silicon nitride ceramic materials, processing, and can produce a variety of sizes with a low-cost precision parts, especially parts of complex shape, yield higher than other ceramic materials. Temperature resistant silicon nitride ceramics acute degeneration, high hardness, the hardness only to diamond, boron nitride and other materials, silicon nitride ceramic material with the engine, due to operating temperature to 1370 degrees Celsius, the engine efficiency can be increased by 30%. At the same time due to temperature increase, can fuel combustion, emissions dropped significantly in the contaminated ingredients, not only reduce energy consumption and reduce environmental pollution.
Other ceramic materials
A wide range of ceramic materials, have their own characteristics, can be made into a variety of functional elements. High-temperature ceramic material for the lithium oxide, talc ceramics for high-frequency insulation material, thorium oxide ceramic dielectric material, barium titanate ceramic optical materials, borides, nitrides, silicides and other metal-ceramic materials for ultra-high temperature. Ferrite ceramic magnets, magnetic memory, magnetic heads and other materials, rare earth cobalt ceramic material for the memory, the semiconductor porcelain is Yamin components, solar cells and other materials.