| 摘要 |
PURPOSE:To easily and surely remove remaining fine oxide by polishing a molybdenum chip with fine abrasive made of oxide and then pickling to immerse it in dilute acid solution. CONSTITUTION:Sintered molybdenum for a diode in which its surface is barrel- polished with fine abrasive made of oxide such as aluminum trioxide, etc., is immersed in dilute acid solution mixed with hydrochloric acid and nitric acid to be pickled. Then, in order to remove an oxide film layer formed by the pickling, it is washed with pure water stream, and then annealed in a reduced gas atmosphere such as hydrogen gas, etc. In order to smooth its surface, a finish-barrel step (gloss-polishing step) is conducted. Thus, the remaining fine oxide can be easily and surely removed.
|
