超细金属粉末注射成形在聚变装置钨零部件中的应用

Application of ultrafine metal powder injection moulding on tungsten components in fusion devices

从超细粉末制备、喂料准备、注射工艺、烧结工艺和热等静压处理等方面研究了超细纯钨粉以及超细稀土氧化物弥散增强钨粉的金属注射成形技术,利用该技术制备了聚变装置中的钨零部件,并对这种超细金属粉末注射成形钨零件的微观组织和热力学性能进行了分析.结果表明:超细纯钨粉零件相对密度可达98%以上,平均晶粒尺寸10~15 μm,500℃以上的热导率与锻造钨零件相当;超细稀土氧化物弥散增强钨粉零件相对密度可达99%以上,平均晶粒尺寸3~5 μm,抗热冲击性能优良.

Metal injection moulding (MIM) technology used for ultrafine pure W powders and rare earth oxides dispersion strengthened-W (ODS-W) powders was investigated, including ultrafine powders preparation, feedstock preparation, injection molding technology, sintering technology, and hot isostatic pressing treatment. This technology was applied to manufacture the tungsten components in fusion devices. Microstructures and thermodynamic performances of the tungsten components prepared by this ultrafine metal powder injection moulding technology were analyzed. The results show that, the MIM tungsten components used with ultrafine pure W powders (MIM-W) can achieve the relative density more than 98%, the average grain size is about 10-15 urn, and the thennal conductivity (above 500 °C) of MIM-W is close to that of the wrought tungsten components. The MIM tungsten components used with rare earth oxides dispersion strengthened-W powders (MIM-ODS-W) can achieve the relative density more than 99%, the average grain size is 3-5 fim, and the thermal shock resistance of MIM-ODS-W shows excellent.