| abstract |
(57) [Summary] [Purpose] To obtain a bonding capillary having high hardness, high toughness, and high corrosion resistance against aqua regia, excellent durability, and good moldability. [Composition] Aluminum oxide alone or 0.1 wt% 1 to 20 wt% of the following magnesium oxide in solid solution % Of the fused alumina, and the fused alumina has an average particle diameter of 1 to 5 μm. |