High Performance Seismic Doped Tungsten Filament Preparation Study

Along with the development of national economy, transportation and national defense industries need a large number of imported from abroad high-performance anti-seismic tungsten filament, which not easy prolapse and breathe in working environment harsh conditions. This article explores and explicits to preparative well craft tungsten filament that high resistance of prolapse and shake production techniques base on ordiuary technology.This paper holds that in the preparation of doping tungsten powder metallurgical stage to the high temperature performance and tungsten filament seismic performance have key effect::1) This article thinks that chooses various impurities content less 50 ppm and grain feature of a single oblique crystal hexagon structure and good flowing performance of APT, which can obtain crystal size of 9.1um blue tungstic oxide in temperature of 260℃-460℃and hydrogen flowing of 0.3-0.5m3 /h conditions.2) The blue tungsten oxide that adding K, Al, Co, Si elements can get different partied sizes of tungsten powder, which need to pass two deoxidation phases in temperature 550℃-870℃. This article think B:D powder the best proportion of 4:6. Because tungsten powder size can appear normal distribution and tungsten filament resistance of prolapse and shake performance greatly improved in high temperature.3) Sintering tungsten bars of shape dimension for 15×15×400mm and specific gravity in 17.2g/cm and crystallite size for 7—8 levels obtain to pass two slowly temperature rising sintering phases. This sintering tungsten bar can get excellent temperature performance tungsten filament. It is analyzed that crafe co tungsten filament obtain good workability and resistance of shake performance best technology which need to use mesotherm slowly speed rising.This article analyzes the mixed cobalt tungsten billet organization and performance the change of the law in plastic processing process (rotary swaging, stretching). Because of plastic processing in depth, tungsten filament density increase and work hardening improve in promptly intermediation annealing condition. To phi 10.0mm annealing tungsten filament analyzes performance of influence in high temperature. Good high temperature and high processing yield tungsten filament need 1900℃recrystallization annealing ,because this condition potassium bubble easily split, annealing speed on tungsten performance little impact.