（1）Tube furnace 1: Thermcraft (USA) 4 in., 1200(^oC), Constant Temperature(L>70 cm)

（2）Tube furnace 2: Anhui Beyike, with slider rail, 3 in., 1200 (^oC), two zones

（3）Tube furnace 3: Hefei Kejing: 1 in., 1200 (^oC), a zone Constant Temperature(L>10 cm)

（4）Tube furnace 4: Hefei Kejing, 2 in., 1200 (^oC), two zones, (L>10 cm)

（5）Tube furnace 5: Thermcraft (USA) 2 in., 1600(^oC), Constant Temperature(L>20 cm)