致密铼粒的制备研究

Study on Preparation of Dense Rhenium Particles

为了制备致密铼粒,采用粉末冶金法和电弧熔炼法分别处理5N铼粉。结果表明:当压坯压力为20 MPa、烧结温度2 000℃、烧结时间4 h时,在氢气气氛下烧结后制得致密铼粒,其致密度达到92.33%,且晶粒尺寸为8~20μm,其微观形貌呈现多孔状且具有较多孔洞缺陷;而电弧熔炼法所得铼粒微观形貌平整无缺陷,其致密度高达99.95%,优于粉末冶金法所得铼粒的致密度,但其晶粒尺寸偏大,其值为700~1 500μm。

In order to prepare dense rhenium particles,5N rhenium powder was treated by powder metallurgy and arc melting respectively.The results showed that when the compaction pressure was 20 MPa,sintering temperature was 2000℃,and sintering time of 4 h,dense rhenium particles were obtained after sintering in a hydrogen atmosphere,with a densification of 92.33%and a grain size of 8~20μm.The microstructure of the particles showed a porous shape with many pore defects.However,the microstructure of rhenium particles obtained by arc melting method was smooth and defect free,with a densification of up to 99.95%,which was better than the relative density of rhenium particles obtained by powder metallurgy method.The grain size was larger,with a value of 700~1500μm.