MoSi_2/稀土复合微粒对钼及其板材组织和性能的影响
摘要
采用自蔓延合成方法制备了MoSi2粉末,并用机械合金化方法制备了MoSi2/La2O3、MoSi2/La2O3、MoSi2/La2O3/Y2O3复合微粒。将复合微粒以固-固掺杂的方式掺杂到钼基体中(质量分数为2%)。用粉末冶金方法进行混料、压制、烧结后,与用同样方法制备的稀土氧化物掺杂钼和纯钼的组织、性能进行比较；后将烧结坯轧制成板材,并与同规格稀土氧化物掺杂钼板和纯钼板材进行组织和性能的比较。结果表明：MoSi2/La2O3、MoSi2/Y2O3和MOSi2/La2O3/Y2O3复合微粒掺杂烧结钼及热轧板材的室温强度、高温强度及室温韧性均优于稀土氧化物掺杂钼和纯钼,且随着温度的升高,MoSi2/稀土氧化物的强化效果更为明显；对于烧结坯而言,MoSi2/La2O3与MoSi2/Y2O3复合微粒掺杂钼相比,前者韧性高于后者,而强度较后者低,而MoSi2/La2O3/Y2O3复合微粒掺杂烧结钼的强度和韧性均在两者之间；对于热轧板材而言,MoSi2/La2O3/Y2O3复合微粒掺杂钼的强度明显高于MoSi2/La2O3与MoSi2/Y2O3复合微粒掺杂钼,更适合作为高温结构件使用。
MoSi2 power was synthesised by self-propagating high temperature synthesis(SHS). MoSi2/La2O3、MoSi2/Y2O3、MoSi2/La2O3/Y2O3 composite particles were made by mechanical alloying(MA) method, and then doped into molybdenum by solid-solid method respectively, with a mass fraction of 2%. At the same time, pure Mo and La2O3/Y2O3 doped Mo were made for coMParison. The microstructure and properties of sintered molybdenum which were made though Powder Metallurgy(PA) method were detected, then rolled into sheet. The microstructure and properties of the rolling sheet were investegated too. Results show that: both strength and toughness of the sintered Mo and rolling Mo sheet which doped MoSi2/La2O3, MoSi2/Y2O3 and MoSi2/La2O3/Y2O3 are higher than that doped La2O3/Y2O3 and pure Mo. And with the rise of temperature, the strengthen effect of MoSi2/rare earth oxides is more apparent. To the sintered Mo, MoSi2/Y2O3 composite particles contribute more to the strength, while the effect of MoSi2/La2O3 on toughness is greater than that of MoSi2/Y2O3. And the strength and toughness of MoSi2/La2O3/Y2O3 doped Mo are both in between. To hot rolling sheet, the strength of MoSi2/La2O3/Y2O3 composite particle doped Mo is apparently higher than MoSi2/La2O3 and MoSi2/Y2O3 doped Mo, which is more suitable for use as high temperature strcture materials.
MoSi2 power was synthesised by self-propagating high temperature synthesis(SHS). MoSi2/La2O3、MoSi2/Y2O3、MoSi2/La2O3/Y2O3 composite particles were made by mechanical alloying(MA) method, and then doped into molybdenum by solid-solid method respectively, with a mass fraction of 2%. At the same time, pure Mo and La2O3/Y2O3 doped Mo were made for coMParison. The microstructure and properties of sintered molybdenum which were made though Powder Metallurgy(PA) method were detected, then rolled into sheet. The microstructure and properties of the rolling sheet were investegated too. Results show that: both strength and toughness of the sintered Mo and rolling Mo sheet which doped MoSi2/La2O3, MoSi2/Y2O3 and MoSi2/La2O3/Y2O3 are higher than that doped La2O3/Y2O3 and pure Mo. And with the rise of temperature, the strengthen effect of MoSi2/rare earth oxides is more apparent. To the sintered Mo, MoSi2/Y2O3 composite particles contribute more to the strength, while the effect of MoSi2/La2O3 on toughness is greater than that of MoSi2/Y2O3. And the strength and toughness of MoSi2/La2O3/Y2O3 doped Mo are both in between. To hot rolling sheet, the strength of MoSi2/La2O3/Y2O3 composite particle doped Mo is apparently higher than MoSi2/La2O3 and MoSi2/Y2O3 doped Mo, which is more suitable for use as high temperature strcture materials.
引文
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