Explanatory notes
… consists of a metal such as iron, nickel, aluminium, chromium or cobalt. Cermets are made by sintering, by … oxide, e.g., iron‑magnesium oxide; nickel‑magnesium oxide; chromium‑aluminium oxide; aluminium‑aluminium oxide. (2) Zirconium or chromium borides; these products are known as borolites. …