| 摘要 |
PURPOSE:To produce an SiC whisker inexpensively and securely by heating a mixture contg. the scum, a C source and an NaF source in the nonoxidizing atmosphere. CONSTITUTION:The scum being the fine powder waste such as quartz contg. about 70wt% SiO2, about 20wt% Al2O3 and about 5 wt% K2O is used and a mixture 2 contg. 1mol part SiO2 caused to the scum, 1.5-5mol part C and 1/24-1/2mol part NaF is packed up to the height A of a base part of a crucible 1 and a space 3 producing a long fiber whisker is formed in the range of B>=5A up to the height B of the upper part thereof. After an inert gas such as Ar is introduced through the introduction pipes 11, 17 and an inflow port 18 and the insides of the crucible 1 and a tube 5 are completely filled with gaseous Ar, the mixture 2 is heated at the prescribed temp. T1 in the range within 1,400-1,700 deg.C with a heater 6 and also while keeping the temp. T2 of the space 3 and the temp. gradient DELTAT2/DELTAZ (the upper a position is, the lower the temp. is) in >=25 deg.C/100mm prescribed value, an SiC whisker having the long fiber of about >=500mum length is produced in the space 3. |
