摘要
采用在1μm粒径的超细SnO2粉末化学镀银的方法,制备了超细AgSnO2复合粉末。通过压制成形、烧结等粉末冶金工艺,对粉末进行烧结试验,结果发现试样表面存在鼓泡现象。文章分析了鼓泡的成因,并采用降低成形压力及粉末煅烧处理等手段消除鼓泡现象。热重分析结果及烧结后的金相组织分析结果表明:较低的成形压力可以改善鼓泡现象,但要从根本上消除鼓泡现象则必须对粉末进行高于450℃的煅烧处理。所得AgSnO2材料中SnO2颗粒分布均匀,电阻率、密度、硬度分别为2.25μΩ·cm、9.85g·cm-3和98HB。
Ultrafine Ag-SnO2 composite powders were prepared by electroless silver plating on the SnO2 particles with 1 μm in average particle size. Voids occurred seriously in Ag-SnO2 alloys sintered by powder metallurgy method. It can be improved by lower forming pressure and higher calcinations temperature. Results of Differential Scanning Calorimeter (DSC) and metallographical analysis show that the electroless plated Ag-SnO2 powders have to be calcined at the temperature higher than 450°C to eliminate voids. SnO2 particles are dispersed homogeneously in sintered Ag-SnO2 alloys. Electrical resistivity, density and Brinell hardness of the Ag-SnO2 alloys are 2.25 μΩ·cm, 9.85 g·cm-3 and 98 HB respectively.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2005年第3期204-207,共4页
Powder Metallurgy Technology