| 摘要 |
Refractory articles, particularly of use in the construction of nuclear reactors, comprise a body of graphite coated with a layer of silicon carbide and a protective glaze which consists essentially of a fused mixture of zinc oxide, aluminium oxide, lead oxide and silica. Proportions in percentages by weight are as follows:-ZnO 6 to 10; Al2O3 2 to 6; Pb3O4 55 to 65; and SiO2 25 to 30. The frit used is a mixture of two frits, the first frit having no lead oxide, the second having all ingredients. The glaze is flash fired at 1200 DEG to 1300 DEG C. for about 6 minutes. Specification 716,083 and U.S.A. Specification 1,948,382 are referred to. |
