本研究的主要目的為探討高矽球墨鑄鐵及高矽鑄鋼在高溫空氣下的氧化行為，以探討氧化層型態與矽元素內部氧化之關聯。實驗的進行是將試片置於熱處理爐內，分別在500、600、700及800℃下的溫度進行氧化試驗；氧化的程度是量測實驗前、後試片的重量變化或氧化層的厚度；氧化層與內部氧化的顯微結構則以OM、SEM及EDS觀察與分析。
實驗結果顯示：高矽鑄鋼的氧化增加量隨Si含量增加而減少，顯示Si可以提升鋼鐵的抗氧化能力；高矽球墨鑄鐵與高矽鑄鋼的氧化模式略有不同，高矽球墨鑄鐵的氧化行為屬於線性關係，而高矽鑄鋼的氧化行為則是介於線性與拋物線關係之間；在500℃氧化時，高矽球墨鑄鐵，含4.71 wt.% Si，耐氧化能力最佳；在600及700℃氧化時，氧化初期高矽球墨鑄鐵亦顯示較佳的耐氧化能力，但在氧化後期，含矽4.05 wt.%的高矽鑄鋼，則有最佳的耐氧化能力。
Si的內部氧化現象，並未發生在500℃的氧化，而是發生在更高溫的600、700 及800℃的氧化；高矽鑄鋼在800℃並未觀察到此種Si的內部氧化現象。至於內部氧化層之氧化物隨時間的增加，其形態會由緻密轉為鬆散，而隨著溫度的上升，其形狀也由長條狀轉為短小粗大狀。另外，高矽鑄鋼之內部氧化層則較高矽球墨鑄鐵緻密且細小。

In this research it is aimed to investigate the high temperature oxidation behavior of high silicon ductile iron and high silicon cast steel in air. The relationship between morphology of oxide layers and internal oxidation of silicon element is studied. Oxidation tests were carried in a furnace at 500, 600, 700, and 800 ℃, respectively; the extent of oxidation was measured by the change of weight of specimen or by the thickness of oxide layers; the microstructure of oxide layers and internal oxidation were examined by OM, SEM, and EDS.
The results show that: for high silicon cast steels, the oxidation weight gains decrease with Si content increased, this conforms that the addition of Si will improve the oxidation resistance of steel; the oxidation modes different for high silicon ductile iron to high silicon cast steels, the oxidation behavior of high silicon ductile iron is linear, and high silicon cast steels is toward parabolic; oxidation at 500℃, high silicon ductile iron with 4.71 wt. % has the best oxidation resistance; oxidation at 600 and 700℃, high silicon ductile iron also showed a better resistance in the early stage, but a inferior resistance in the late oxidation.
The internal oxidation of Si was not occurred in 500℃, but occurred in temperatures higher than 600 ℃; high silicon cast steels was not observed the internal oxidation of Si at 800℃. As time increasing, the shape of internal oxidation changes from dense to loose, and as temperature increasing, the particles gets thicker. In addition, the internal oxidation layer of high silicon cast steels is more dense and smaller than high silicon ductile iron.

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