| 摘要 |
The invention provides a powder comprising at least 95% by number of molten grains having the following chemical composition, in mass percent on the basis of oxides, for a total of 100%: 0≤BaO≤40.8%; 0≤SrO≤31.8%; 27.2%≤AlO≤31.3%; 32%≤SiO≤36.9%; other species ≤1%, wherein the content of at least one of BaO and SrO oxides is higher than 0.3%, the size of said grains ranges from 5 to 150 microns. |
