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采用溶胶凝胶法制备了Ni0.1Mg0.1Cu0.3Zn0.5Fe2O4铁氧体,在650℃预烧结成铁氧体粉体,并压制成环状样品后,分别用一步烧结(TL=950℃、1050℃)和两步烧结工艺(TH=1050℃;△t=0、15、30、45min;TL=950℃)进行烧结,详细研究了一步烧结、两步烧结对铁氧体结构和性能的影响。发现两步烧结能够改善铁氧体的结构和性能,主要结果如下:(1)在TH=1050℃,△t=30min时的两步烧结过程中得到了所有烧结过程中密度最大且颗粒均匀并含有较少气孔的铁氧体;(2)在TH=1050℃,△t=15min时的两步烧结过程中得到了晶粒非常均匀,晶界良好的铁氧体,使饱和磁化强度较一步烧结提高了10emu/g以上;(3)在一步烧结中随着烧结温度的提高初始磁导率降低;在两步烧结中初始磁导率随着第一步烧结的保温时间△t增加而增加,并且均优于950℃的一步烧结的初始磁导率;(4)分析了两步烧结的作用机理,两步烧结的第1步烧结能够在烧结刚开始时促进坯体中颗粒的接触、键合、重排,使烧结可以在后续的低温第2步烧结中以合适的速率进行。
The Ni0.1Mg0.1Cu0.3Zn0.5Fe2O4 ferrite was prepared by sol-gel method and pre-sintered into ferrite powder at 650 ℃. The ferrite powder was pressed into ring-shaped samples and sintered in one step (TL = 950 ℃, 1050 ℃) and the two-step sintering process (TH = 1050 ℃; Δt = 0,15,30,45min; TL = 950 ℃). The effects of one-step sintering and two-step sintering on the structure and properties of ferrite influences. The main results are as follows: (1) In the two-step sintering process at TH = 1050 ℃ and △ t = 30min, the highest density and uniform particles were obtained during the sintering process Containing ferrite with less pores. (2) In the two-step sintering process at TH = 1050 ℃ and △ t = 15min, ferrite with very uniform grain size and good grain boundary is obtained, which makes the saturation magnetization step further The sintering increased by more than 10 emu / g; (3) the initial permeability decreased with the increase of the sintering temperature in one-step sintering; the initial permeability increased with the increase of the holding time Δt in the first sintering in the two-step sintering (4) The mechanism of two-step sintering was analyzed. The first step of two-step sintering can promote the contact of particles in the blank at the beginning of sintering, Bonding, rearrangement, the sintering can be carried out in the subsequent low-temperature sintering of the second step at a suitable rate.