1990年10月14日～17日于匈牙利召开第五届国际钨学术讨论会,共有26个国家的116个企业代表约180人出席会议。会上除报道供需动向外,还发表了灯用钨丝研究报告11篇,其中美国5篇,苏联2篇,匈牙利、德国,荷兰、日本各1篇。会议以提高掺杂钨的质量为主题,防止灯用钨丝热变形(下垂)一般采用添加K、SiO_2、Al_2O_3的钨丝。但 The Fifth International Symposium on Tungsten was held in Hungary from October 14 to October 14, 1990. A total of about 116 participants from 26 countries attended the conference. In addition to reporting the supply and demand trends, the conference also published 11 research reports on tungsten filament lamps, including 5 in the United States, 2 in the Soviet Union, 1 each in Hungary, Germany, the Netherlands and Japan. Meeting to improve the quality of doped tungsten as the theme, to prevent the lamp tungsten filament thermal deformation (sagging) is generally used to add K, SiO_2, Al_2O_3 tungsten wire. but