メカニカルアロイング法によるSnO_2粒子分散Ag合金の合成 Synthesis of SnO_2 Particle Dispersed Ag Alloy by Mechanical Alloying
To prepare a SnO<SUB>2</SUB> particle dispersed nano structured silver alloy by mechanical alloying process, the mixtures of SnO<SUB>2</SUB> and silver powder were tumbler-ball milled in the air atmosphere, using ethanol as a milling surfactant. The milling process and phase formation were monitored by X-ray diffraction analysis(XRD), optical microscopy, SEM, EPMA and TEM of the milled powder. The milled powders were consolidated by conventional sintering process and extrusion process. The microstructure of the consolidated compacts was observed by optical microscopy and TEM. Fine SnO<SUB>2</SUB>/silver composite powder particle with a microstructure of nano size SnO<SUB>2</SUB> particles were homogeneously dispersed throughout the silver matrix, was formed after 100h milling, in spite of milled in the air atmosphere. It was difficult to obtain densed and homogeneous nano structured SnO<SUB>2</SUB>/silver consolidated compact by conventional sintering pro-cess, because phase separation between dispersion phase, SnO<SUB>2</SUB>, and matrix phase, silver, during sintering of the composite powder particles milled over 50h milling time. It was possible to obtain densed and homogeneous ultra-fine microstructured SnO<SUB>2</SUB>/silver alloy by combination of mechanical alloying and extrusion process which occurs severe mass transfer during consolidation.
粉体および粉末冶金 43(6), 795-800, 1996-06-15
Japan Society of Powder and Powder Metallurgy