| 摘要 |
A pair of hard material seal members, such as for example a pair of plaques forming the members which control the flow regulation in a faucet, in which the two seal members are made of at least moderately hard materials, such as steatite, ceramic materials of modest quality, metals and synthetic materials, and at least one of the seal members is coated with a thin layer of a high hardness material, such as silicon carbide, another carbide, a nitride or cubic crystallographic lattice carbon, applied by means of physical or chemical deposition from a gaseous medium. This feature provides a low friction coefficient even in the absence of lubrication, does not give rise to excessive adhesion between pieces of smooth surface finish and ensures preservation of smooth operation for very long periods of time as compared with known seal members. One of the seal members may be made of not coated moderately hard material and its surface may have a degree of finish rougher than that of the coated seal member. |
