【摘要】 进行了纯钨制品注射成形的研究,以高纯钨粉为原料,采用SEM、红外碳硫仪CSA2003、电光分析天平TG328A等作为检测手段,成功制得一批帽形薄壁零件。在2320℃氢气气氛下烧结,烧结试样的密度可达18.36g·cm-3,相对密度为95.13%。同时,通过系列试验,对比研究了掺杂少量的稀土氧化物(La2O3、Y2O3)对注射成形纯钨制品性能的影响。结果表明,稀土元素氧化物的添加,提高了注射成形纯钨制品烧结密度,明显细化了烧结试样的晶粒,稀土氧化物作为第二相粒子弥散分布于基体中,阻碍了位错的运动和高温烧结时晶粒的长大,从而提高了注射成形钨制品的强度。更多还原

【Abstract】 Pure tungsten products were fabricated by powder injection molding method. The raw material used was high pure tungsten powder. The samples were investigated by means of X-ray diffraction, scanning electron microscopy, infrared C/S measurement. analytical balance. The samples were sintered at 2320 ℃ under hydrogen atmosphere, the density reached 18.36 g·cm-3 and the relative density was 95.13%. It is found that rear earth(La2O3, Y2O3) play an important role in the densification process and the growth of the grain. The results indicate that adding rare earth enhanced the density of the sample, as well as decreased the grain size. It is found that the rare earth distributed in the matrix as the second phase, witch hindrance the movement of the dislocation and the growth of the grain under high temperature, so that the strength of the sample improved a lot.更多还原