| 摘要 |
<p>A seal assembly for a shaft extending through a pressure boundary for transmitting mechanical energy across the pressure boundary comprises a sealing surface associated with said boundary and a sealing surface associated with the shaft and disposed opposite the sealing surface of said boundary, so as to provide a leakage flow path therebetween, with at least one of the sealing surfaces (19) being formed substantially from silicon nitride. </p> |
