COATED NEAR -ALPHA TITANIUM ARTICLES

摘要

PCT No. PCT/GB88/00389 Sec. 371 Date Oct. 31, 1989 Sec. 102(e) Date Oct. 31, 1989 PCT Filed May 17, 1988 PCT Pub. No. WO88/09396 PCT Pub. Date Dec. 1, 1988.Articles of titanium based materials are protected against alpha case formation such as results from exposure to air at high temperatures by coating with an iron-chromium based alloy. The coating may be deposited by ion plating, sputter plating or sputter ion plating these methods being preferred for avoidance of surface contamination. A preferred iron to chromium ratio (by weight) is 10:1 to 2.5:1. Specific coating compositions (given by weight) are: (a) 12Cr-1(Mo+Zr)-0.15C-balance Fe, b) 15.5Cr-4.8A1-0.3Si-0.03C-balance Fe.