Alloy ZL108 is a main brand of cast aluminum alloy used for power engine pistonmaterial, it is not needed to contain titanium according to the national standard now.
Hypereutectic Al-Si alloy which has small proportion, low coefficient of thermal expansion, good wear resistance and dimensional stability is an ideal pistonmaterial.
过共晶铝硅合金比重小、热膨胀系数低、耐磨性和体积稳定性好，是理想的活塞材料。
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Because of particularity of structure and material, the piston must be measured by the non - contact method. but, at present there isn ' t mature technique.