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采用共沸蒸馏法结合粉末冶金法制备了ZrO_2增强钨合金(W-ZrO_2)。利用XRD、SEM、EDS、TEM等研究了初始溶液的p H值、还原工艺及ZrO_2掺杂量对W-ZrO_2复合粉末粒径及形貌的影响,观察了钨合金的显微组织及其物相组成,测定了复合钨粉的粒度、钨合金的密度、显微硬度及其磨损性能。结果表明:初始溶液的p H值对掺杂钨粉的形貌和尺寸有着显著影响,随着初始溶液的p H值增大,复合粉末颗粒尺寸逐渐增加;经750℃×2 h+850℃×4 h两段还原工艺后所得的复合粉末粒径细小;ZrO_2对复合钨粉颗粒及钨合金晶粒细化作用明显,进而对钨合金密度及硬度产生显著影响,随着ZrO_2含量的增加,钨合金密度与显微硬度降低,耐磨性呈先增加后降低趋势,其中W-3%ZrO_2钨合金的耐磨性较纯钨提高了20%~40%。
ZrO 2 reinforced tungsten alloy (W-ZrO 2) was prepared by azeotropic distillation combined with powder metallurgy. The effects of initial pH value, reduction process and ZrO_2 doping amount on the particle size and morphology of W-ZrO_2 composite powders were investigated by XRD, SEM, EDS and TEM. Phase composition, determination of the particle size of the composite tungsten powder, tungsten alloy density, microhardness and wear properties. The results show that the p H value of the initial solution has a significant effect on the morphology and size of the doped tungsten powder. As the p H value of the initial solution increases, the particle size of the composite powder gradually increases. After 750 ℃ × 2 h + 850 ℃ The particle size of the composite powder obtained after two stages of reduction process was small. ZrO 2 had a significant effect on the grain refinement of the composite tungsten powder and the tungsten alloy, and then had a significant effect on the density and hardness of the tungsten alloy. With the increase of ZrO 2 content, Tungsten alloy density and microhardness decreased, the wear resistance first increased and then decreased, which W-3% ZrO 2 tungsten alloy wear than pure tungsten increased by 20% to 40%.