| 摘要 |
<p>870,170. Modifying zirconium surfaces. ATOMIC ENERGY OF CANADA Ltd. Feb. 9, 1959 [Feb. 10, 1958] , No. 4452/59 Class 82(2) [Also in Group XXXIV] A bearing member is made of zirconium which is oxidized to form a tightly adherent surface layer of blue-black zirconium dioxide of monoc 1 i n i c crystalline form on its inner surface. The bearing member may be a zirconium body 4, Fig. 1, having a surface layer 5 contacting a journal insert 3 on a shaft 2 or a zirconium journal 8, Fig. 2, having a layer 9; alternatively a bearing may have surface layers on both the body 4 and the journal 8. Oxidation is effected by heating the zirconium in air, oxygen, steam or hot water, using e.g. an electric furnace at a temperature of 700-900‹C. for a period sufficient to produce the blueblack colour which occurs when the dioxide layer has monoclinic crystalline Form with a density of 5.31 grams/c.c.</p> |
