噴射分散法による酸化物分散強化ニッケルおよびニクロム

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WO_3, Al_2O_3, ZrO_2, Y_2O_3 or ThO_2-dispersed nickel and nichrome were produced by the "Spray-Dispersion Method", and their mechanical properties were studied. The main results obtained are summarized as follows : 1) The addition of 1.6 pct. niobium as a "controlling element" was effective in lowering the oxide particle size in nickel. The mean diameter of ThO_2 particles in nichel containing 1.6 pct. niobium reached to about 60 nm. 2) 20pct. of chromium in nickel also decreased the oxide particle size, and the addition of 0.8 pct. niobium in nickel-20 pct. chromium alloy decreased the mean diameter of Al_2O_3 particles to 79 nm. 3) Tensile strengths at room temperature of oxide spray-dispersed nickels increased with the volume fraction of oxide particles and their increments were maintained even at 1073K. In the case of oxide spray-dispersed nichromes, their incroments of tensile strength at room temperature were small, but those were multiplied at higher temperature. 4) The fine oxide particles contributed to an increase of creep rupture strength, and this tendency became more pronounced toward longer time. 1273K-1000h creep rupture strength of 2vol pct. ThO_2 spray-dispersed nickel and 3.8 vol pct. Al_2O_3 spray-dispersed nichrome, for instance, were 47 Mpa and 19 Mpa, respectively. 5) The oxidation resistance at high temperature of oxide spray-dispersed nickel and nichrome was improved as compared with non-dispersed ones. From these results, the oxide dispersion strengthened nickel-base heat-resisting alloy has been able to produce by the "Spray-Dispersion Method".
社団法人日本鉄鋼協会の論文
1982-06-01

噴射分散法による酸化物分散強化ニッケルおよびニクロム

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