Using a scanning laser microscope and mercury porosi-meter, we evaluate the effects of an excellent car-coating treatment on resistance to environmental corrosion after aging for three years. The treatment maintains the clear surface. The effect can be explained mainly by the contact angle of sessile drops.
It is a serious problem that excess helium-ion etching greatly deceases superconducting transition temperature (Tc) and critical current density (Jc) of Bi1 .6 Pb 0.4 Sr 2 Ca 2 Cu3 Ox. Thus, the influence of the etching on Tc and Jc has been investigated for the Bi oxide. A critical DOSE (Dc) to maintain high Tc above 100 K is defined and evaluated. The Dc value is about 3.2x1017 (ions/mm2) for the helium-ion etching.
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