据英国德温特出版公司出版的《化学专利文摘》1991年第3期报道,日本批准了一种熔炼优质Ni合金用的坩埚获得专利权。专利号为J9 0059-852-B,1990年12月13日公布。 这种坩埚材料的成分(重量%)为:Al_2 O_3~- 68～78%,SiO_2~- 22～32%,杂质含量控 According to the 3rd edition of Chemical Abstracts published by Derwent Press in the United Kingdom, Japan approved the patent for a crucible for melting high quality Ni alloy. Patent No. J9 0059-852-B, December 13, 1990 announcement. The composition (wt%) of the crucible material is as follows: Al 2 O 3 ~ 68-78%, SiO 2 ~-22-32%, impurity content control