Water lubricated composite thrust bearing of nuclear main pump

A water lubricated composite thrust bearing of a nuclear main pump, comprising:

• a stainless steel base having an upper concave-convex surface and a lower concave-convex surface;
• an upper engineering plastic layer disposed on the upper concave-convex surface;
• and
• a lower engineering plastic layer disposed on the lower concave-convex surface, wherein a ratio of an area of the upper or the lower concave-convex surface to an area of an orthographic projection of the upper or the lower concave-convex surface on the stainless steel base ranges from 1.2 to 2,
• wherein a thickness of the upper engineering plastic layer is 2 to 15 mm, and a thickness of the lower engineering plastic layer is 0.5 to 5 mm,
• wherein at least one of the upper engineering plastic layer and the lower engineering layer is a composite engineering plastic layer comprising a modified layer and a non-modified layer fused together, the non-modified layer being bonded to the concave-convex surface,
• wherein the modified layer is made of modified polyether ether ketone or modified polyphthalazinone ether sulfone ketone, and the non-modified layer is made of polyether ether ketone or polyphthalazinone ether sulfone ketone, and
• wherein a thickness of the modified layer is ⅔ to ⅘ of a thickness of the composite engineering plastic layer.