| 摘要 |
A composite refractory insert for a melt containment vessel metering nozzle comprises a refractory inner component defining a flow passage for the melt and a refractory outer component defining an outer dimension of the insert. The insert can be positioned within a hollow recess in a pre-formed refractory metering nozzle body. The insert is produced by forming the inner component of zirconia by a pressing technique and the outer component by casting an alumina composition around the inner component. The nozzle may be formed by moulding a refractory alumina composition using a shaped mandrel to form the hollow recess. |
