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Abstract The bending method can be used to measure the stresses of the oxide scale directly in-situ during high temperature oxidation.In com- bination with the acoustic emission technique it was used to measure the critical stresses of the oxide scale of tantalum.The acoustic emis- sion can sensitively monitor ventical and parallel cracks of the oxide scale,while the weight gain curves only give information about vent- ical cracks.During the oxidation of tantalum at 500℃,550℃,600℃ in 1 arm O_2,the cracking stresses(σ_(max,c) represented by the maximum stresses)are 23.3,38.5,18,4×10~6 kgf/m~2 respectively.The cracking stresses are dependent on the oxidation temperature.SEM,X-ray diffra- ction analysis and optical microscopy show that this result is related to the density and type of cracking of the oxide scale.The less denser the oxide is,the smaller the critical stress is.The stresses causing blister-like cracks are larger than the stresses causing cracks along the grain boundaries.In a word,the oxide scale cracking not only depends on stresses,but also on other mechanical properties,
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Received: 25 February 1990
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Cite this article:
Li Tiefan Li Meishuan (Institute of Corrosion and Protection of Metals Academia Sinica). THE MEASUREMENT OF THE CRITICAL CRACKING STRESSES OF THE OXIDE SCALE DURING THE OXIDATION OF TANTALUM. J Chin Soc Corr Pro, 1990, 10(1): 9-14.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1990/V10/I1/9
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