| 摘要 |
PCT No. PCT/GB81/00216 Sec. 371 Date Jun. 2, 1982 Sec. 102(e) Date Jun. 2, 1982 PCT Filed Oct. 2, 1981 PCT Pub. No. WO82/01144 PCT Pub. Date Apr. 15, 1982.A method of removing refractory material from a component comprises contacting the refractory material with a chemically active agent whereby to convert the refractory material to a more easily removable substance, and removing the more easily removable substance. The method enables alumina cores defining cooling passages in cast blades for use in gas turbine engines to be removed at practically useful rates. |
