The invention belongs to the field of magnetic shape memory alloy, in particular a preparation method of a porous MnNi antiferromagnetic shape memory alloy, including the following steps: Mn powder, Ni powder and pore forming agent CO (NH2) 2 are respectively called, and then mixed evenly into a pressing die, and the blank is pressed in two directions. The blank is removed from the mold and put into the jades. Among them, the bottom of the green and Jyu boat is reserved enough to be placed in a tubular resistance furnace. Under the protection of the inert atmosphere, it is taken out of the furnace by programmed heating and sintering, and is quickly quenched into the water. The alloy has the advantages of larger size and excellent properties of the film alloy, and the shape memory properties of the alloy can be adjusted effectively by adjusting the porosity. The process is simple, the composition is uniform, the porosity and the pore structure are controllable.
【技术实现步骤摘要】
多孔MnNi反铁磁形状记忆合金的制备方法
本专利技术属于磁性形状记忆合金
,特别涉及一种多孔MnNi反铁磁形状记忆合金的制备方法。
技术介绍
磁性形状记忆合金具有磁致应变大、磁热效应显著和响应快等优点,在磁驱动器、磁制冷器等领域有广泛的应用市场,其中,Mn基反铁磁合金作为高阻尼材料已有实际应用,但作为形状记忆合金,Mn基合金还存在磁致应变小,恢复率低,相变温度调控困难等不足。目前,形状记忆合金薄膜作为一种新型驱动器材料,具有输出应力和位移大,可磁控,容易加工等优点,在微机械和微电机等领域受到可普遍关注,但目前的Ti-Ni-Pd和Ti-Ni-Pt等合金薄膜的性能虽好,但其价格昂贵,因此,目前形状记忆合金薄膜的应用受到了一定程度的限制。专利号为CN104561918B“一种MnFeCu三元反铁磁形状记忆合金薄膜的制备方法”,其利用磁控溅射的方法制备Mn基三元反铁磁形状记忆合金薄膜,但在样品厚度方向上尺寸有限。
技术实现思路
为了解决Mn基块体合金形状记忆性能较差,以及Mn基薄膜合金尺寸有限的问题,本专利技术提供了一种多孔MnNi反铁磁形状记忆合金的制备方法,同时该方 ...
【技术保护点】
1.一种多孔MnNi反铁磁形状记忆合金的制备方法,其特征在于,包括以下步骤:(1)分别称取Mn粉、Ni粉和造孔剂CO(NH2)2,将其混合均匀后装入压制模具中,先单向加压至45~55MPa,保压4~6min,再反向加压至45~55MPa,保压4~6min,生坯从模具中取出;(2)放入刚玉舟中,其中,生坯与刚玉舟的底部保留足够空隙,再一起放入管式电阻炉中,惰性气氛保护,从室温用200~220min升温至295~305℃,保温25~35min,之后用55~65min升温至795~805℃,保温25~35min,然后用55~65min升温至1000~1100℃,保温烧结240~3 ...
【技术特征摘要】
1.一种多孔MnNi反铁磁形状记忆合金的制备方法,其特征在于,包括以下步骤:(1)分别称取Mn粉、Ni粉和造孔剂CO(NH2)2,将其混合均匀后装入压制模具中,先单向加压至45~55MPa,保压4~6min,再反向加压至45~55MPa,保压4~6min,生坯从模具中取出;(2)放入刚玉舟中,其中,生坯与刚玉舟的底部保留足够空隙,再一起放入管式电阻炉中,惰性气氛保护,从室温用200~220min升温至295~305℃,保温25~35min,之后用55~65min升温至795~805℃,保温25~35min,...
【专利技术属性】
技术研发人员:崔书山,万见峰,陈乃录,王颖,王建利,
申请(专利权)人:上海交通大学,
类型:发明
国别省市:上海,31
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