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马兹达公司将Ni发泡体铸在铝合金活塞上的第一道环槽,这种“Ni发泡体复合活塞”从86年3月31日装在具有内冷增压、排气量为3500℃的SL型直喷式柴油机上使用,它比耐蚀高镍铸铁（含Ni为14wt％）环的活塞的重量约轻7％,寿命提高3倍以上。 直喷式内燃机是将燃料直接喷射在燃烧室,第一道环槽直接承受暴发压力,因此必须增强第一道环槽槽部的强度,耐磨性等。 该公司将陶瓷材料用在温度很高的活塞顶部,在槽部采用了Ni发泡体,这样使该活塞的发动机,最高输出为105PS/3200rpm,最大扭矩为;35kgm/2000rpm,可达到最好的动力性能。 这种新开发的活塞是对发泡氨基甲酸乙脂进行镀镍,再将Ni的发泡体铸在铝合金制活塞的第一道环槽上形成一体。 Ni发泡体是住友电气工业制造,将发泡氨基甲酸乙脂进行镀镍后,再经过氧化还原处理,氨基甲酸乙脂被蒸发,然后,将这发泡体固定在模型中进行液态模锻,发泡体的气孔中浸入铝的溶液,形成一体。液态模锻后进行淬火、回火热处理（T_6处理）,在这个热处理阶段,在Ni与Al的界面上生成Ni_（3Al）、Ni_（2Al）_（3）等金属化合物,这都是高耐磨损性的物质,其磨损量仅是单体铝合金的1/5～1/10。
Mazda cast Ni foam on the first ring groove on the aluminum piston, a “Ni foam composite piston” mounted on March 31, It is used on an SL model direct injection diesel engine at 3500 ° C. It is about 7% lighter and has a life expectancy more than 3 times longer than a piston with a corrosion-resistant, high-nickel cast iron (14 wt% Ni). Direct injection internal combustion engine injects the fuel directly into the combustion chamber. The first ring groove directly withstands outburst pressure, so the strength, wear resistance and the like of the groove of the first ring groove must be enhanced. The company uses ceramic materials on the top of the hot piston and Ni foam in the groove so that the piston’s engine has a maximum output of 105 PS / 3200 rpm and a maximum torque of 35 kgm / 2000 rpm, which is best achieved The dynamic performance. The newly developed piston is nickel-plated foam urethane, Ni foam and then cast in the aluminum alloy piston ring formed on the first ring. Ni foam is made by Sumitomo Electric Industries Co., Ltd. After the foamed urethane is nickel-plated, it is subjected to a redox treatment and the urethane is evaporated. Then, the foam is fixed in a mold for liquid die forging , The pores of the foam are immersed in a solution of aluminum to form an integrated body. After liquid forging, quenching and tempering heat treatment (T_6 treatment) is carried out. In the heat treatment stage, Ni_ (3Al), Ni_ (2Al) _ (3) and other metal compounds are formed at the interface between Ni and Al, Abrasion of the material, the wear of aluminum alloy is only 1/5 ~ 1/10.