| 摘要 |
PROBLEM TO BE SOLVED: To provide a sintered boride having broken resistance used for steel cutting. SOLUTION: The sintered boride comprises a boride of formula: Alx <=1 My <=1 Bz >=12 and unavoidable impurities. The boride comprises Al, an element M chosen from groups Ia and IIa of the periodic table and boron, and accounts for >=98 vol.% of the sintered boride. Since the sintered boride substantially contains only boride, it exerts excellent resistances to wear and break when used as a cutting tool. |
