共查询到16条相似文献,搜索用时 171 毫秒
1.
2.
3.
1引言众所周知,气氛烧结是现代高性能MnZn铁氧体生产中的关键工序,而品质良好、价格便宜的氮气又是实施气氛烧结的基本条件之一。我国是世界上铁氧体生产大国,软磁铁氧体的产量已跃居世界第二位,生产企业很多,因生产规模及设备不同,故采用的供气方式也各异。以... 相似文献
4.
MnZn软磁铁氧体纳米粉末的烧结特性 总被引:5,自引:0,他引:5
锰锌铁氧体纳米粉末具有很强的活性,其烧结特性对于烧结工艺参数十分敏感。采用纳米粉末生产软磁铁氧体可以明显降低烧结温度,缩短烧结时间,有利于铁氧体化学成分和显微组织的控制,进而改各铁氧体的磁性能。研究表明铁氧体纳米粉末在700℃左右烧结后的密度巳接近理论值,纳米粉体对加热速度十分敏感,而且由于纳米粉体比表面积大,客易发生氧化,因此烧结气氛必须严格控制、采用氮气气氛,并调节平衡氧分压。本文结合粉末基本的烧结理论以及纳米粉体特性,对Mnzn铁氧体纳米粉末的烧结特性进行分析。 相似文献
5.
6.
7.
8.
9.
在软磁铁氧体材料的生产中,粉料活性(比表面积)对生产工艺和材料性能有重要影响,烧结是影响材料性能的关键工序之一.本文概述了比表面积测试仪和热分析仪在软磁铁氧体生产质量控制中的应用. 相似文献
10.
11.
12.
H. Naghib zadeh G. Oder J. Hesse T. Reimann J. Töpfer T. Rabe 《Journal of Electroceramics》2016,37(1-4):100-109
low-κ dielectric LTCC was developed, to realize successful co-firing with NiCuZn ferrite tapes. A critical high-temperature process in the production of highly integrated LTCC modules is the migration of silver from inner conductors into the LTCC glass phase. Intensive silver migration causes strong deformation of LTCC multilayers during firing in air. Silver migration into the LTCC glass phase depends on oxygen content of the sintering atmosphere and can be minimized by sintering in nitrogen atmosphere. However, partial decomposition of NiCuZn-ferrite and formation of cuprite was observed during sintering in nitrogen and, consequently, the permeability of the ferrite decreases. As shown by a combined XRD/thermogravimetric study the co-firing of LTCC modules with silver metallization and integrated ferrite layer demands precise adjustment of oxygen partial pressure. 相似文献
13.
14.
15.
For co-firing of MnZn-ferrite tapes and LTCC dielectric tapes, the sintering shrinkage curves and the coefficient of thermal expansion of ferrite and dielectric tapes were matched. Highly densified embedded ferrite without any cracks could be manufactured by co-firing at 900 °C in nitrogen atmosphere. However, the permeability of MnZn-ferrite co-fired between dielectric tapes is significantly reduced (μ´=100) compared to that of the separately sintered ferrite (μ´=500). Changes in the phase stability and microstructure of MnZn-ferrite were investigated to explain the permeability reduction in the embedded ferrite. It is supposed that early densification of the dielectric tapes on the top and bottom of the ferrite layer prevent the gas exchange during sintering which is necessary for (Mn,Zn)Fe2O4 spinel formation. As a result, high amount of Fe2O3 secondary phase and a Mn-rich spinel phase with low permeability remain in the embedded ferrite layer. 相似文献
16.
对比研究了N2窑动态气氛和真空炉静气氛及Al2O3粉对MnZn铁氧体Zn挥发的影响,并研究了由尼导致产品机械强度的变化,Al2O3在MnZn铁氧体烧结过程吸收挥发出Zn蒸汽,并反应生成ZnAl2O3,与真空炉静态气氛相比,N2窑动态气氛加剧了MnZn铁氧体的Zn挥发。由于成分变化,导致晶格常数的改变,从而在铁氧体表面产生很大的内应力,同时表层Zn挥发导致的松散“框架”结构进一步加剧了这种应力,使产 相似文献