Patent GB-1075887-A (GB)
Title: Improvements in and relating to titanium and titanium base alloys
IPC: C04B35/66
Filed: 1965-04-27
Abstract: A titanium or titanium base alloy body has a surface coating which essentially consists of sodium silicate and/or silica and finely distributed aluminium and is such as to form an effective protective glaze when working the body at temperatures of the order of 1800 DEG to 2400 DEG  F.  A titanium body has a surface coating to protect the surface from atmospheric oxidation at temperatures up to 2400 DEG  F. which comprises a layer of 1/64 to 1/4 inch thickness of an intimate mixture consisting essentially of (a) 3 to 6 parts by weight of a sticky aqueous solution of sodium silicate and/or colloidal silica, (b) 3 to 8 parts by weight of aluminium powder, minus 40 mesh, and (c) up to 2 parts of sand, sandblast grade, minus 120 mesh.  The aqueous solution of sodium silicate may be of a Na2O to SiO2 ratio from 1 to 1.7 to 1 to 3.9 and water content not more than 65%.  The layer may comprise sodium silicate solution of 40 DEG  Be, 1.0 to 3.25 Na2O to SiO2 ratio.  The layer may comprise about 5 parts of the aqueous solution of sodium silicate and/or colloidal silica, may contain about 5 parts by weight of the aluminium powder, e.g. of minus 200 mesh, and may comprise about 1 part by weight of the sand. The coating may be dried at a temperature not exceeding about 200 DEG F.  The drying may be at such rate as to prevent blistering of the coating and after drying the coating, the body is heated to a temperature between 1800 DEG  and 2400 DEG  F. The body may be rolled after it has been so heated.  The coating may be applied by trowelling, spraying or brushing.ALSO:A titanium or titanium base alloy body has a surface coating which essentially consists of sodium silicate and/or silica and finely distributed aluminium and is such as to form an effective protective glaze when working the body at temperatures of the order of 1800 DEG F to 2400 DEG F.  A titanium body has a surface coating to protect the surface from atmospheric oxidation at temperatures up to 2400 DEG F which comprises a layer of 1/64 to 1/4 inch thickness of an intimate mixture consisting essentially of (a) 3 to 6 parts by weight of a sticky aqueous solution of sodium silicate and/or colloidal silica, (b) 3 to 8 parts by weight of aluminium powder, minus 40 mesh, and (c) up to 2 parts of sand, sandblast grade, minus 120 mesh.  The aqueous solution of sodium silicate may be of a Na2O to SiO2 ratio from 1 to 1.7 to 1 to 3.9 and water content not more than 65%.  The layer may comprise sodium silicate solution of 40 DEG  Be, 1.0 to 3.25 Na2O to SiO2 ratio.  The layer may comprise about 5 parts of the aqueous solution of sodium silicate and/or colloidal silica, may contain about 5 parts by weight of the aluminium powder, e.g. of minus 200 mesh, and may comprise about 1 part by weight of the sand.  The coating may be dried at a temperature not exceeding about 200 DEG F.  The drying may be at such rate as to prevent blistering of the coating and after drying the coating, the body is heated to a temperature between 1800 and 2400 DEG F.  The body may be rolled after it has been so heated. The coating may be applied by trowelling, spraying or brushing.