• 한국표면공학회지
• /
• 제20권4호
• /
• pp.144-153
• /
• 1987

In the case of dipping the Ni-Resist cast iron into molten aluminum with iron content, the thickness of intermetallic compound was remarkably increased with increasing iron content. The thickness was shown by following equation in the range of 1-3% iron content; $x=22.5t^{1/2}+4.47{\cdot}t{\cdot}(Fe%)$. where, x is thickness(${\mu}m$), t the time (minute), Fe% the iron w/o. When the Ni-Resist cast iron was dipped into the molten aluminum containing zinc content, the intermetallic compound thickness was also increased with increasing zinc contents. And thickness was represented by the following equation in the range of 2-10% zinc content; $x=3.46t^{1/2}+0.27{\cdot}t{\cdot}(Zn%)$. However, in the case of dipping the Ni-resist cast iron into molten aluminum with silicon content, the thickness of intermetallic compound was decreased with increasing silicon content, as shown in the following equation; $x=7.17t^{1/2}-0.15{\cdot}t{\cdot}(Si%)$. The intermetallic compound formed onto Ni-Resist cast iron was identified to be $FeAl_3\;and\;Fe_3Al$. As the result of hardness measurement, the peak hardness appeared in the intermetallic compound at near interface of the cast iron and the compound.

• 한국주조공학회지
• /
• 제29권3호
• /
• pp.120-127
• /
• 2009

The characterestics of high Si-high Mo ductile cast iron, high Si-high Mo C.V. cast iron and Ni-resist cast iron were compared and evaluated. The nodule count of the last one was lower and the nodularity was higher than those for the first one, respectively. The first two had ferritic matrices with small amounts of molybdenum carbides. The first one had the highest tensile strength and the last one the lowest elongation. This had the highest high temperature strength and that of the second one was greatly increased from the room temperature strength. The volumes of the first two were decreased during cooling and that of the last one changed little. The thermal expansion coefficient of the last one was the highest and the first one the lowest. During high temperature oxidation, even though the volume of the first one was increased, the weight was decreased and the volume and weight of the second one were increased. The change of the increased weight of the last one was more than that of thickness.