摘要
以粒径为50 nm的NiFe_(2)O_(4)粉末作为原料,制备出单相NiFe_(2)O_(4)陶瓷,优化放电等离子烧结工艺,研究升温速率和保温时间对烧结块体物相、微观结构、致密度及磁性能的影响。结果表明,升温速率从30~60℃/min升高至60℃/min,致密度显著升高至97.7%。当升温速率升高100℃/min时,致密度升高至98.3%。且升温速率提高,块体的磁滞损耗下降;保温时间从4 min延长到12 min时,块体的磁导率和密度皆增大,但当保温时间超过12 min后,其密度及磁导率不升反降。并得出升温速率为100℃/min和保温时间12 min为最佳烧结工艺,所制备出的NiFe_(2)O_(4)陶瓷烧结体致密度为98.3%,磁导率为13000 H/m。
Single phase NiFe_(2)O_(4)ceramics were prepared from NiFe_(2)O_(4)powder with particle size of 50 nm.The spark plasma sintering process was optimized.The effects of heating rate and holding time on the phase,microstructure,density and magnetic properties of sintered blocks were studied.The results show that the heating rate increases from 30℃/min to 60℃/min,and the density increases significantly to 97.7%.When the heating rate increases by 100℃/min,the density increases to 98.3%,and the hysteresis loss decreases with the increase of heating rate;When the holding time is extended from 4 min to 12 min,the permeability and density of the block increase,but when the holding time exceeds 12 min,the density and permeability do not increase but decrease.The results show that the optimum sintering process is heating rate of 100℃/min and holding time of 12 min.The density of NiFe_(2)O_(4)ceramic sintered body is 98.3%,the permeability is 13000 H/m.
作者
颜亮
严彪
YAN Liang;YAN Biao(School of intelligent manufacturing and control engineering,Shanghai polytechnic university,Shanghai 201209,China;School of materials science and engineering,Tongji University,Shanghai 201804,China)
出处
《粉末冶金工业》
CAS
北大核心
2022年第5期36-40,共5页
Powder Metallurgy Industry
基金
智能制造2020校基金项目(A10GY21H003-EX02)。
