铜包覆纳米钨粉及轧制薄带的烧结与组织特征

SINTERING AND MICROSTRUCTURE OF COMPACT AND ROLLED STRIP OF NANOSCALED W-40% Cu POWDER

本文研究了纳米级W-40%Cu包覆粉的制备方法,使用软模压制成形法和粉末轧制法制备两种试样并进行了烧结收缩动力学的研究。结果表明,纳米级W-40%Cu包覆粉压坯在980℃达到最大收缩速率。在1 200℃烧结后,合金相对密度达到98%,平均晶粒尺寸为2μm。纳米级W-40%Cu粉末轧制薄带在1 200℃下烧结成为W-40%Cu合金薄带,合金薄带的相对密度达到99%。SEM和定量金相对烧结合金薄带进行组织结构分析结果表明,薄带合金中的平均W晶粒度仅为1.5μm,W晶粒的形状呈椭球体状。

The preparation of W-Cu powder was studied.The compacted and rolled specimens were produced by rubber mold pressing and powder rolling respctively to investigate the shrinkage kinetics during sintering.The shrinkage curves showed that for compacted specimen the maximum shrinkage occurrs at 980℃,The relative density of specimen sintered at 1 200℃ was 98% with an average grain size of 2 μm.The density of the strip of Nanoscaled W-40% Cu wae 99% after sintering at 1 200℃ in H_2.The results of SEM and optical o...