Fe粉量对真空烧结NiAl_(2)O_(3)电子材料组织及导电性能的影响

Effect of Fe Powder Content on Microstructure and Electrical Conductivity of Vacuum Sintered NiAl_(2)O_(3) Electronic Material

选择真空烧结工艺制备得到NiAl_(2)O_(3)电子材料,通过添加Fe粉的方式来使得试样获得优异的导电性能。采用实验测试的方式对该合金的物相成分、微观形貌与电磁性能进行了测试。研究结果表明:逐渐提高Fe含量后,形成了更强的Fe衍射峰,NiAl_(2)O_(3)衍射峰强度发生了降低。Fe和NiAl_(2)O_(3)形成良好的相容状态,制得具备优异高温稳定性的NiAl_(2)O_(3)/Fe试样。提高Fe加入量后,基体组织的孔隙率发生减小,使合金组织达到更致密的状态。加入较高比例的Fe时,试样呈现正的电抗值,具备明显感抗性,正电抗值和频率之间表现为递增变化的趋势。增大频率后,导致电阻明显增大,引起电导率减小。未添加Fe粉添加量的NiAl_(2)O_(3)合金未表现出明显磁性。加入Fe含量较低时,试样获得顺磁性。提高Fe加入量后,试样发生了明显频散。40%Fe添加量试样形成了明显的弛豫型磁谱,具备抗磁性,实现双负性。

The vacuum sintering process was selected to prepare NiAl_(2)O_(3),and Fe powder was added to obtain excellent conductivity of the sample.The phase composition,microstructure,and electromagnetic properties of the alloy were tested by experiments.The results show that after increasing Fe content gradually,a stronger Fe diffraction peak is formed,and NiAl_(2)O_(3)diffraction peak intensity decreases.Fe and NiAl_(2)O_(3)form a good compatibility state,and NiAl_(2)O_(3)/Fe sample with excellent high-temperature stability is prepared.After increasing the amount of Fe,the porosity of the matrix microstructure decreases,which makes the alloy microstructure reach a more compact state.When a higher proportion of Fe is added,the sample shows a positive reactance value,showing obvious sensitivity resistance,and the positive reactance value and frequency show an increasing trend.The increase in frequency results in a significant increase in resistance and a decrease in conductivity.The NiAl_(2)O_(3)alloy without Fe powder added does not show prominent magnetic properties.When Fe content is low,the sample obtains paramagnetism.After increasing the amount of Fe,the sample shows apparent dispersion.The sample with the Fe content of 40%forms an evident relaxation magnetic spectrum with diamagnetism and realizes the double negative property.