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将APT一次还原得到的蓝钨通过固液掺杂加入铈元素,然后通过二次还原获得铈钨粉,通过200 MPa的压力等静压制成型,在中频炉内进行烧结,获得铈钨材料。利用SEM、能谱等分析手段对所制备的铈钨材料进行分析。对烧结温度和烧结保温时间对铈钨各项性能的影响进行研究。结果表明,烧结保温时间的长短对铈钨的密度几乎没有影响。受到晶界间的Ce O2颗粒阻碍,铈钨的硬度和晶粒尺寸在烧结保温时间增加达到4~5 h之后的变化并不明显。铈钨材料的密度、硬度、晶粒尺寸随着烧结保温温度的增加而增加,超过2 200℃之后,烧结温度对铈钨的密度和硬度影响不大。Ce O2在铈钨内部起的作用是细晶强化和颗粒强化的综合,而非弥散强化。
The blue tungsten obtained by one-time reduction of APT is added into the cerium element through solid-liquid doping, and then the cerium tungsten powder is obtained through secondary reduction, isostatic pressing is performed at a pressure of 200 MPa, and sintered in an intermediate frequency furnace to obtain the cerium tungsten material . The prepared cerium tungsten materials were analyzed by SEM, EDS and other analytical methods. The effects of sintering temperature and sintering holding time on the properties of cerium and tungsten were studied. The results show that the sintering holding time on the density of cerium tungsten almost no effect. Due to the obstruction of Ce O2 particles between the grain boundaries, the hardness and grain size of cerium tungsten did not change significantly after the sintering holding time was increased to 4 to 5 h. The density, hardness and grain size of cerium tungsten material increase with the increase of sintering temperature. When the temperature exceeds 2 200 ℃, the sintering temperature has little effect on the density and hardness of cerium tungsten. The role of Ce O2 in the cerium tungsten interior is a combination of fine grain strengthening and grain strengthening rather than dispersion strengthening.