共查询到18条相似文献,搜索用时 156 毫秒
1.
2.
Fe-Ga-B合金室温塑性及轧制材料磁致伸缩性能 总被引:2,自引:0,他引:2
研究了0.5%(原子分数)B对Fe83 Ga17合金室温力学性能的影响及(Fe81 Ga19)99.5 B0.5轧制薄片磁致伸缩性能.结果表明,少量B添加提高了Fe-Ga合金的室温塑性,实现(Fe81 Ga19)99.5 B0.5合金的轧制成形.热处理对(Fe81 Ga19)99.5 B0.5合金薄片材料磁致伸缩性能有很大影响.在同一热处理制度条件下,磁致伸缩性能随变形量的增加而减小;对于变形量为93.5%的样品,同一热处理时间,样品磁致伸缩性能随热处理温度的升高而增加,同一热处理温度时,样品磁致伸缩性能都表现出先升高后降低的变化趋势,样品在1300℃保温2h后,磁致伸缩性能最好,达到1.65×10-4.热处理对(Fe81 Ga19)99.5 B0.5合金薄片材料磁致伸缩性能的影响归因于对样品织构的影响.具有{100}<012>织构样品的磁致伸缩性能最高,而{111}<110>和{111}<112>织构对应的磁致伸缩性能较低. 相似文献
3.
Fe-Ga合金具有较大的磁致伸缩应变λ,低的饱和磁化场.Fe83Ga17饱和磁致伸缩应变可以达到3.00×10-4.为了进一步验证不同相结构对合金磁致伸缩性能的影响,对样品进行中子衍射和差热分析,发现Fe83Ga17合金在700℃附近存在相结构变化,结构变化导致合金磁致伸缩系数的改变. 相似文献
4.
采用电弧熔炼法制备了Fe81Ga19合金多晶样品,研究了不同热处理工艺对合金组织结构及磁致伸缩性能的影响.样品经过700℃、800℃和900℃保温后采用空冷、炉冷和淬火3种冷却方式.结果显示,经过不同热处理后样品的微观组织均为单相bcc结构,而磁致应变从34×10-8到94×10-6不等;当热处理温度为800℃时,淬火处理后可获得较好的磁致伸缩性能(88×10-6),而热处理温度较高(900℃)时,采用炉冷的方式可获得较好的磁致伸缩性能(94×10-6).推测热处理方式和晶体取向对Fe81Ga19合金磁致伸缩性能有较重要的影响. 相似文献
5.
研究了Mn元素掺杂及热处理工艺对超磁致伸缩材料Tb0.5Dy0.5(Fe1-x)1.91(x=0~0.15)合金温度性能的影响,实验结果表明Mn掺杂对该材料居里温度影响较大,随Mn掺杂量的增加居里温度降低:在无预压应力时,Mn掺杂提高了合金的低温、低场磁致伸缩应变性能;热处理工艺对进一步提高磁致伸缩性能无明显作用。 相似文献
6.
7.
8.
定向凝固Tb0.3Dy0.7(Fe,M)1.95超磁致伸缩合金微观缺陷的研究 总被引:2,自引:0,他引:2
研究了经超高温梯度向凝固制备的Tb0.3Dy0.7(Fe,M)1.95合金样品中存在的晶体缺陷的类型,分析其对该材料磁致伸缩性能的影响,探讨如何调整工艺来消除晶体缺陷,提高材料的磁致伸缩性能。 相似文献
9.
10.
粘结Sm-Dy-Fe合金的磁致伸缩性能研究 总被引:5,自引:0,他引:5
采用粘结法制备了Sm_(1-x)Dy_xFe_2合金样品,测量了粘结合金样品的静态磁致伸缩、动态磁致伸缩系数、增量磁导率和磁-机械耦合系数,研究了磁致伸缩性能等随磁场H的变化规律。发现当x<0.12时合金的低场磁致伸缩随x的增加而增加,高场磁致伸缩随x的增加而降低。棒状Sm_(0.88)Dy_(0.12)Fe_2合金在H=200kA/m时的磁致伸缩达405×10~(-6),磁-机械耦合系数和动态磁致伸缩系数分别达到0.34和1.28nm/A,因而粘结Sm_(0.88)Dy_(0.12)Fe_2合金具有一定的实用价值。 相似文献
11.
Liqin Yang Xinsheng Yang Li Lv Min Zhang Zhantao Wei Yong Zhao 《Journal of Superconductivity and Novel Magnetism》2013,26(10):2993-2996
Perovskite manganite composites containing polymer binder (epoxy resin) and additional metal (Sn) were prepared using a novel bonded method. The magnetoresistance (MR) for the sample containing 4 % polymer binder and 10 % metal was as high as 20 % and nonsensitive to temperature in the temperature range of 50–300 K under applied field of 3 kOe. The nontemperature-sensitive and large MR could be ascribed to the contribution of polymer and metal, respectively. When temperature was higher than 300 K, intrinsic colossal magnetoresistance effect was observed. 相似文献
12.
A. V. Buketov P. D. Stukhlyak V. V. Levyts’kyi M. A. Dolgov I. G. Dobrotvor 《Strength of Materials》2011,43(3):338-346
The effect of the modification of a fine filler with an epoxy oligomer and compositions by ultraviolet irradiation on the
creep of materials filled with basalt and glass cloths under the influence of aggressive media has been studied. It has been
found that to reduce the creep of materials, two-layer epoxy composite “hybrid” materials containing glass and basalt cloths
must be used. In order to improve the performance of composites, an ultraviolet-irradiated epoxy binder containing epoxy-oligomer-modified
fine filler particles must be used as an interlayer. 相似文献
13.
为获得磁性能适中的磁体,采用流动温压成型技术制备了各向同性粘结Nd Fe B/锶铁氧体复合磁体.利用振动样品磁强计(VSM)研究了不同粘结剂对粘结Nd Fe B/锶铁氧体复合磁体磁性能的影响.研究表明:环氧值适中的酚醛环氧树脂制备的磁体具有较好的磁性能;当采用环氧值为0.480 mol/100 g酚醛环氧树脂BPANE8200H做粘结剂时,粘结Nd Fe B/锶铁氧体复合磁体获得了最佳的磁性能:Br=0.55 T,Hcj=620.6 k A/m,(BH)max=45.6 k J/m3.在保证磁体磁性能的前提下兼顾力学性能,粘结磁体流动温压成型温度参数的设置必须考虑粘结剂的软化点温度. 相似文献
14.
A magnetoelectric (ME) composite consisting of a single PZT rod embedded in a matrix of continuous Terfenol-D fiber and epoxy
medium has been fabricated and characterized. With an optimized aspect ratio of the composite rods, a large ME effect has
been observed. The magnetostrictive effect of the continuous Terfenol-D fiber/epoxy medium can be enhanced by imposing an
optimal pre-loading stress on the material and this pre-loading stress can be induced by suitable heat treatment. Experimental
results show that the ME effect of the single PZT rod/continuous Terfenol-D fiber/epoxy composites can be enhanced significantly
by a post-curing process. A thermal stress-mediated continuous fiber composite model has been used to explain the ME enhancement
of the post-cured composites. 相似文献
15.
磁电复合材料在磁-电能量转换等领域具有重要的潜在应用价值, 研究磁电复合材料在较高频率下的磁电耦合特性对于实际应用具有重要意义。本文中以0-3型的Terfenol-D(Tb0.30Dy0.70Fe2)/环氧树脂复合材料为磁致伸缩层, 以PZT 压电陶瓷为压电层, 制备了三明治结构的层合磁电复合材料。研究了Terfenol-D/环氧树脂复合材料层的磁致伸缩性质, 并对所制备的层合磁电复合材料磁通密度、 介电常数以及磁电电压系数等随频率和偏磁场的变化规律进行了系统研究。结果表明, 由于Terfenol-D/环氧树脂复合材料的引入, 层合磁电复合材料呈现出良好的频率响应特性, 可靠工作范围大大拓宽。层合磁电复合材料具有优良的动态磁电耦合性能, 在优化偏磁场630 Oe和共振频率69.6kHz下的磁电效应高达21.2 V/cmOe。此外, 层合磁电复合材料的磁电效应随偏磁场的变化发生明显变化, 并存在优化偏磁场。对上述现象和结果进行了详细讨论, 并给出了层合磁电复合材料的磁电耦合机制。 相似文献
16.
Low pressure injection moulding of SiC platelet reinforced reaction bonded silicon nitride 总被引:2,自引:0,他引:2
Reaction-bonded Si3N4 toughened by oriented SiC platelets was fabricated via low pressure injection moulding (LPIM). Initially, the rheology of ceramic suspensions was optimized with respect to solid content, SiC platelet loading, particle surface properties and binder composition. Surface active additives were used to modify the particle–polymeric binder interphase in order to prevent particle reagglomeration, to reduce the viscosity and/or to increase the solid content. The relationship between LPIM processing variables and platelet orientation in injection moulded reaction bonded silicon nitride ceramics was studied and the resultant mechanical properties were compared to composites containing randomly dispersed platelets. 相似文献
17.
18.
以粉末粘结、模压成型方法,研制了0-3型的E-44环氧树脂基稀土-铁系超磁致伸缩复合材料。采用电阻应变片技术与Agilent 4294A型动态阻抗分析仪,研究了超磁致伸缩合金/环氧树脂复合材料的磁致伸缩性能及高频磁性能,并对所制备的磁致伸缩复合材料的磁导率、截止使用频率等随频率和树脂体积分数的变化规律进行了系统研究。结果表明:树脂的添加,不仅可以提高复合材料的截止频率和高频磁性能,使其具有良好的高频响应特性,其截止频率达30 MHz以上;而且通过适当选择树脂的体积分数,复合材料仍能保持良好的磁致伸缩性能,当树脂体积分数分别为20%、30%时,磁致伸缩系数分别达808×10-6、821×10-6,而当复合材料中树脂的体积分数为50%时,其磁致伸缩系数仍高达592×10-6。探讨了树脂/磁致伸缩复合材料的磁电耦合机制。 相似文献