| 摘要 |
A seal elements of hard material for use, for instance, as a pair of small plates which form the parts to control the fluid flow through a faucet. The seal is constructed of a hard material-a metal, a metallic oxide, a metallic carbide, a metallic nitride, a ceramic or glassy material-which is sintered from a semi-finished product obtained by mixing a powder of fine particle size of the aforementioned hard materials with an organic binder-a plastic material, a wax, or a combination of these substances. This mixture is formed under compression in a mold and, eventually, at least some of the binder is eliminated. The seal can emerge already finished from the sintering operation, or it can be subjected to some other treatment of its surface, that is, it can be lapped or it can be treated galvanically or it can be covered with a thin layer of a harder material-silicon carbide or another metallic carbide, a metallic nitride, or carbon with a cubic crystallographic lattice structure-applied by physical or chemical vapor deposition.
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