STANDARD SAMPLE FOR MEASURING THICKNESS OF OXIDE LAYER OF ZIRCONIUM-BASE ALLOY MEMBER

摘要

PURPOSE:To obtain a standard sample for measuring the thickness of the oxide layer of a zirconium-base alloy member having good calibration accuracy and long life by providing an insulating oxide layer to a prescribed film thickness on the surface of the zirconium-base alloy. CONSTITUTION:Zr alloys such as zircalloy-2, -4, Zr-2.5%Nb and Zr-1%Nb known generally as the alloy for atomic reactors are usable for the zirconium-base alloy member. Any insulator is usable for the insulating oxide layer and is exemplified by ceramic layers of zirconium oxide, aluminum oxide, etc. A sample to be measured is a Zr alloy and plural pieces are preferably provided by using the zirconium oxide and changing the film thicknesses in order to measure the thickness of the oxide layer thereof. Since the specified thickness of the oxide layer is reproduced with the long life and high accuracy in the above-mentioned manner, the calibration with the extremely high accuracy is made possible.