| 摘要 |
<p>A refractory plate is disclosed which has at least one flow aperture and is particularly useful as a valve closure means for metallurgical vessels. The plate of the invention comprises a refractory concrete base member having located on its sliding face or faces a ceramic oxide insert having a cold bonding strength greater than 300 kp/cm2, a hot bending strength greater than 40 kp/cm2 at 1500.degree.C, a cold compressive strength greater than 2000 kp/cm2 and a gas permeability below 1 nanoperm. The width of the insert measured at right angles to the direction of travel of the plate is between 1.3 and 3.5 times the diameter of the aperture.</p> |
