Method of manufacturing oxide superconductor thick film

A method for manufacturing a thick film of an oxide superconductor that contains Bi, Pb, Sr, Ca, and Cu, and that is formed on a surface of a substrate or board, the method comprising the steps of:

• applying an oxide superconductor paste on the surface of the substrate or board when the thick film is fabricated so as to achieve a film thickness of 260 μm or greater;
• baking the oxide superconductor paste coated on the surface of the substrate or board to yield a superconductor thick film, compressing the resulting thick film, and performing subsequent baking;
• and
• causing the Pb in the thick film directly on the surface of the substrate or board to remain so that when an EPMA is used to measure the intensity of a Pb signal, the relative intensity of the Pb signal is 0.67 or higher;
• wherein
• the relative intensity of the Pb signal in the EPMA is obtained by baking an oxide superconducting synthetic powder (molar ratio of Bi:Pb:Sr:Ca:Cu=1.85:0.35:1.90:2.05:3.05) at 850° C. for 100 hrs, using CIP subsequently to perform compression at a pressure of 3 ton/cm2;
• performing further baking at 850° for 100 hrs;
• preparing a bulk form of an oxide superconductor having (Bi,Pb)2+aSr2Ca2Cu3O2 (0<a<0.5);
• measuring the signal strength of the Pb in the central region of the bulk form;
• and normalizing the resulting signal strength to 1 (one).