| 摘要 |
Product comprising - a sintered support constituted of an "aggregate" constituted of particles having a size of greater than 100 µm, the balance of said support being the "matrix", and - a protective layer at least partially covering the surface of said support, the aggregate representing more than 60% and less than 95% of the weight of said support and being constituted, for more than 80% by weight, of silicon carbide grains, the protective layer being constituted of a glass or of a glass-ceramic, and having the following chemical analysis, in percentages by weight on the basis of the oxides: - 45% = SiO2 = 90%; - 1% = manganese expressed in the form MnO = 20%; - 2% = aluminium expressed in the form Al2O3 = 15%; - other elements, apart from oxygen, expressed in an oxide form: = 25%. |
