| 摘要 |
<p>The coating has ferrite and/or spinel base. Specif. the spiners are metallic selected from Cr, Ni and Mn. More specif. complex silicates can be included. A composition is prepared which has as its base alkaline and/or metal oxides selected from those constituting the spinels, and the composition is then treated by heating, it to 600-1200 degrees C in the presence of iron oxides.</p> |
