nlwxpearo
Joined: 13 Dec 2010
Posts: 520
Read: 0 topics
Warns: 0/5
Location: England
|
 Posted: Sun 1:22, 09 Jan 2011 Post subject: Metal matrix composite material composition, prope |
|
|
Metal matrix composite material composition, properties and applications
Engineering technology, its application is still expanding rapidly. In the automotive industry, the application of metal matrix composites used for improving the performance of auto parts have played an important role. Honda developed a stainless steel long fiber reinforced aluminum alloy car engine connecting rods, forged steel connecting rods than its high stiffness, good fatigue resistance, and decrease the quality of its reciprocating piece 27, making the engine friction reduction,[link widoczny dla zalogowanych], crank journal size decreases. The stainless steel reinforced aluminum alloy connecting rods for Honda City'85M / Y car engine, engine friction reduction 1O, fuel consumption reduced by 5. Ceramic particle reinforced aluminum alloy used in automotive engine valve spring seat body weight in the seat than the steel spring 48, spring workload reduced 2O. When the engine speed was 1500r/min and 6000r/rain time. Valve train friction were reduced by 17 and 9. Hybrid fiber-reinforced aluminum matrix composites than the cast iron engine block cylinder block stiffness, wear resistance, thermal conductivity, and can be effectively cooled. Japan's Toyota and ART developed alumina short fiber reinforced aluminum piston to replace the local high-nickel austenitic cast aluminum piston Ring,[link widoczny dla zalogowanych], piston automobile research and development build not only weight loss 5 ~ l0, but also enhances the pressure and not enhance the bond strength between the areas is also higher than that of cast iron and aluminum Ring bonding strength between. Equipped with a Toyota car of the composite may be extended to 30 million overhaul of mileage km, the engine output power can be increased by 5, and the consumption of fuel and lubricants were decreased, the British developed AE composite cylinder diesel engine to replace the traditional cast iron steel sets, not only weight loss 2O, and cooling efficiency, reduced heat distortion and mechanical deformation of the piston and piston ring wear r, oil consumption is low, the phenomenon of channeling gas reduction. In the aerospace industry, application of metal matrix composites has been highly valued. U.S. space shuttle's pole is a continuous fiber reinforced aluminum matrix boron composite materials, the Hubble telescope cover is continuous carbon fiber reinforced aluminum matrix composite materials. SiC / A [composite materials aircraft flange flange weight loss than the traditional 20 to 40 aircraft. Metal matrix composite materials with a jet engine compressor blades, turbine disks, rotor and three satellite killer missile guidance parts and so made a significant effect of weight loss and improve performance. Currently, the aerospace industry is being vigorously developed for jet engines and high temperature metal matrix composites used in aircraft seat frame of metal matrix composites. In other areas,[link widoczny dla zalogowanych], the application of metal matrix composites have achieved good results. Japanese with aluminum oxide reinforced aluminum alloy wheel drive industrial robots, with crystal glass fiber reinforced aluminum alloy, the loading and unloading machine impeller pump parts,[link widoczny dla zalogowanych], silicon carbide whisker reinforced aluminum alloy with the turbine blades and other short, with the metal matrix composites based on the theory deepened, manufacturing process improvements and lower production costs, metal matrix composites will replace many of the traditional metal materials to make products, and will result in materials processing industry and related fields, profound change. (This editorial Liu) in former times the original collection of ,199502-21 IB (on the next page 36) Through the above analysis, we can draw the following conclusions; ① In general, the friction coefficient between the silicon nitride ceramics than iron and steel low coefficient of friction between; ② different manufacturing methods and to add components on silicon nitride ceramic friction coefficient between the larger of which, pressureless sintering silicon tetrachloride (waterfall plus 4.31A1tOa, 5.10MYO,[link widoczny dla zalogowanych], 0. 45W) and high-pressure gas within the sintered silicon nitride (add 2.73AI: Oa, 4.72Y2Oa, 0.39w) combination has a smaller coefficient of friction; ③ to physical adsorption, chemical adsorption film or silicon nitride film coated on the surface can effectively reduce the friction coefficient; ① CaF Jing solid lubricant can significantly reduce the silicon nitride at high temperature between the coefficient of friction. 1995 'of shows, with the silicon nitride ceramics friction in a car engine parts, helps to reduce friction, lower power consumption and reduce component wear, is a considerable potential to replace steel material. However, the friction properties of silicon nitride ceramics are from theory to practice there are a lot of the problem is not entirely clear and requires further research and development.
The post has been approved 0 times
|
|
