492QS 射流燃烧室汽油机用活塞材质试验

EXPERIMENTAL INVESTIGATION ON PISTON MATERIAL USED IN THE 492 QS FLUIDIC COMBUSTOR GASOLINE ENGINE

讨论了用混合稀土对Ａｌ－Ｓｉ共晶合金的变质工艺，测定了合金的热抗拉强度、线膨胀系数和活塞的尺寸稳定性．结果表明：加入混合稀土１％后，ＺＬ１０８号合金的热抗拉强度提高了２６％，线膨胀系数降低，活塞的尺寸稳定性增加．

The modified operation with a mixer of RE on the Al Si eutectic alloy is discussed.The high temperature tensile strength,linear expansion coefficent and size steadiness of a piston are measured.The results show that when a 1% mixer of RE is added,the high temperature tensile strength of the alloy increases by a factor of 26%,the linear expansion coefficient of the alloy decreases and the size steadiness of the piston is enhanced.