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最新的中型Titan卡车所用的Mazda SL型3.5L直喷式涡轮增压柴油机上采用了一种新型的复合合金活塞材料,这种新型的活塞材料明显地改善了柴油机的工作情况及耐久性。Mazda公司声称:与传统的镶有耐热高镍铸铁环槽的铝活塞相比,这种复合合金活塞材料使柴油机的效率提高10％以上,发动机的磨损减少了20％,活塞的寿命延长了2倍,另外每个活塞的质重也减轻了约10％。对于功率较大的柴油机,活塞的头部承受着较大的热负荷及燃烧压力的作用,这种情况在直喷式涡轮增压发动机中更为严重。对付这种大负荷的最常用的方法就是将一个耐热高镍铸铁环铸在铝活塞的上部活塞环槽内。
The new mid-size Titan truck used on the Mazda SL 3.5L direct-injection turbocharged diesel engine with a new composite alloy piston material, this new piston material significantly improved diesel engine performance and durability. Mazda claims that the composite alloy piston material increases the efficiency of diesel engines by more than 10% and reduces engine wear by 20% over the traditional aluminum pistons with heat-resistant, high-nickel cast iron ring grooves, extending piston life 2 times the weight of each piston also reduced by about 10%. For larger diesel engines, the head of the piston is subject to greater thermal load and combustion pressure, which is more severe in direct injection turbocharged engines. The most common way to deal with this heavy load is to cast a heat-resistant, high-nickel cast iron ring in the upper piston ring groove of the aluminum piston.