| 摘要 |
PURPOSE:To form a brake ring excellent in erosion resistance, thermal shock resistance and wear resistance and to enhance productivity of horizontal continuous casting by utilizing a sintered body having the specified composition consisting of BN, ZrO2, AlN and/or (Al2O3-B2O3) compd. as constitutional material. CONSTITUTION:A brake ring is formed of a sintered body contg. >=50wt.% BN, >=5wt.% ZrO2 and >=5wt.% AlN and/or (Al2O3-B2O3) compd. As ZrO2, both partially stabilized zirconia and stabilized zirconia are utilized but this stabilized zirconia is preferably utilized because a crack is made difficult to be generated in the sintered body. As (Al2O3 B2O3) compd., the simply mixed powder of Al2O3 powder and B2O3 powder is utilized but synthesized powder is preferably utilized which is previously synthesized so that the molar ratio of Al2O3 and B2O3 is regulated to about 9:2 in order to obtain the physical property of the excellent sintered body. |
