| 摘要 |
A protective film for metallic articles against penetration of nitrogen, carbon and boron at chemical-heat treatment by means of glow discharge plasma at a temperature ranging from 450 DEG to 950 DEG C. A protective coating is formed on the metallic article by a dispersed mixture of tin and lead absorbed on titanium dioxide containing 35 to 60% by weight of colloidally dispersed tin, 5 to 10% by weight of colloidally dispersed lead, 10 to 23% by weight of titanium dioxide, 5 to 10% by weight of a binding agent such as methyl methacrylate, and the remainder up to 100% by weight is an organic solvent such as toluene, xylene, and ethyl acetate. The mixture is used as a protective coating against penetration of nitrogen, carbon and boron at a chemical-heat treatment by means of a glow discharge plasma at a temperature range from 450 DEG to 950 DEG C. |
