摘要
研究氧化-还原法直接再生利用重合金切屑的工艺技术,并发现,通过控制工艺参数,例如,在850℃使用氢气还原,能够采用此技术得到高质量的再生重合金粉末,其粒度细小,约为1μm,粉末形状规则;然而,当还原温度提高至900℃及其以上时,还原粉末长大,表面变得不规则。在原始颗粒的表面生长出许多根须。但随着还原温度从900℃提高至950℃,再生粉末的含氧量由0 2314%降低至0 1700%。此外,氧化-还原法直接再生的重合金粉末化学成分与原始粉末相当。
The processes of direct recycling heavy metal turnings by the oxidation-reduction technique have been investigated in detail. The average particle size of recycled alloy powders was about 1.5 μm, and the shape of powder particle whose main chemical composition is W-Ni-Fe-Co-Mn was regular when the final reduction temperature was 850°C. The average size of the particle increased to 5 μm and 8 μm when the reduction temperature was increased to 900°C and 950°C, respectively. However, if the reduction temperature was above 900°C, the surface of recycled powder was complicated. When the reduction temperature was increased from 900°C to 950°C, the particle of recycled powder grew slightly, and the content of oxygen decreased from 0.2314% to 0.1700%. It has been also found that the chemical composition of the recycled alloy powder is the same as that of the primary heavy metal turnings.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2003年第4期232-235,共4页
Powder Metallurgy Technology
