發(fā)布時(shí)間：2018-02-26 03:06

  本文關(guān)鍵詞： Fe-Si-Ni磁粉芯 有效磁導(dǎo)率 品質(zhì)因數(shù) 直流疊加特性 磁芯損耗　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著電子信息技術(shù)的飛速發(fā)展,金屬磁粉芯被廣泛應(yīng)用于線路濾波器、輸出電感和開關(guān)電源等領(lǐng)域。金屬磁粉芯是將磁性粉末顆粒與非磁性絕緣介質(zhì)混合均勻后壓制成型的一類軟磁材料,主要分為鐵粉芯、鐵硅(Fe-Si)磁粉芯、高磁通(Fe-Ni)磁粉芯、鐵硅鋁(Fe-Si-Al)磁粉芯、鐵硅鎳(Fe-Si-Ni)磁粉芯、鐵鎳鉬(MPP)磁粉芯和非晶納米晶磁粉芯。其中,Fe-Si-Ni磁粉芯作為一種新型金屬磁粉芯,近年來得到越來越多的應(yīng)用,但是關(guān)于其制備工藝和性能研究的報(bào)道還很少。 本文采用球磨制粉的方法制備了Fe-Si-Ni粉末,然后通過模壓成型將其制備成Fe-Si-Ni磁粉芯。研究了粉末的磁性能和鈍化處理以及粉末粒度、鈍化劑濃度、成型壓力、熱處理工藝以及粉末預(yù)退火對磁粉芯密度ρ、飽和磁感應(yīng)強(qiáng)度Bs、矯頑力Hc、有效磁導(dǎo)率μe、品質(zhì)因數(shù)Q、直流疊加特性DC-bias和磁芯損耗P的影響。 研究結(jié)果發(fā)現(xiàn)：隨著粉末目數(shù)的增加,磁粉芯的密度ρ逐漸減小,品質(zhì)因數(shù)Q逐漸增大。隨著鈍化劑濃度的升高,磁粉芯的密度ρ、飽和磁感應(yīng)強(qiáng)度Bs和有效磁導(dǎo)率μe逐漸減��；矯頑力Hc、品質(zhì)因數(shù)Q、直流疊加特性DC-bias和磁芯損耗P逐漸增大。隨著成型壓力的增加,磁粉芯的矯頑力Hc、直流疊加特性DC-bias和磁芯損耗P逐漸減��；密度ρ、飽和磁感應(yīng)強(qiáng)度Bs、有效磁導(dǎo)率μe、品質(zhì)因數(shù)Q和抗拉強(qiáng)度逐漸增大。650℃熱處理時(shí),隨著熱處理時(shí)間從0h增加到5h,磁粉芯的飽和磁感應(yīng)強(qiáng)度Bs增大,矯頑力Hc減小,磁芯損耗先減小后增大；而隨著熱處理溫度從550℃升高到750℃,磁粉芯的密度ρ和有效磁導(dǎo)率μe逐漸增大,直流疊加特性DC-bias和磁芯損耗P逐漸減小。 通過以上研究,得出最佳的制備工藝參數(shù)：Fe-Si-Ni粉末經(jīng)過600。C預(yù)退火處理1h后進(jìn)行粒度配比,接著用0.4wt.%的磷酸丙酮溶液進(jìn)行鈍化處理后加入0.5wt.%的W-6C丙酮溶液和0.04wt.%的高嶺土進(jìn)行絕緣粘結(jié)包覆,然后加入0.25wt.%的硬脂酸鋅和0.25wt.%的硬脂酸鋇作潤滑脫模劑,在1.86GPa的壓力下壓制成型,最后將成型的樣品放置于氬氣保護(hù)氣氛中750℃熱處理1h,制得的Fe-Si-Ni磁粉芯有著優(yōu)異的綜合軟磁性能。其飽和磁感應(yīng)強(qiáng)度為1.23T,有效磁導(dǎo)率為60.96,100kHz時(shí)的品質(zhì)因數(shù)為83.72,外加直流磁場強(qiáng)度為100Oe時(shí)的直流疊加特性仍可達(dá)到48.07%,50kHz,50mT時(shí)的磁芯損耗僅為312mW/cm3。
[Abstract]:With the rapid development of electronic information technology, metal magnetic powder cores are widely used in line filters. The metal magnetic powder core is a kind of soft magnetic material which is compacted by mixing the magnetic powder particles with the non-magnetic insulating medium, and is mainly divided into iron powder core, Fe-Si iron powder core, Fe-Ni magnetic powder core with high flux. Fe Si Al Fe Si Al magnetic powder core, Fe Si Ni Fe Si Ni magnetic powder core, Fe Ni Mo (Mo) magnetic powder core and amorphous nanocrystalline powder core are used more and more recently as a new type of metal powder core. However, there are few reports on the preparation process and properties. In this paper, Fe-Si-Ni powder was prepared by ball milling, and then prepared into Fe-Si-Ni core by moulding. The magnetic properties, passivation treatment, particle size, concentration of passivator, molding pressure were studied. The effects of heat treatment and powder pre-annealing on the density of magnetic core 蟻, saturation magnetic induction strength Bs, coercivity HC, effective permeability 渭 e, quality factor Q, DC superposition characteristic DC-bias and core loss P are investigated. The results show that with the increase of the number of powder mesh, the density 蟻 of magnetic powder core decreases, the quality factor Q increases, and the concentration of passivator increases. Density 蟻, saturation magnetic induction intensity Bs and effective permeability 渭 e of magnetic powder core gradually decreased, coercivity HC, quality factor Q, DC superposition characteristic DC-bias and core loss P increased gradually. The coercivity, DC superposition characteristic of magnetic powder core, DC-bias and core loss P decrease gradually, and the density 蟻, saturation magnetic induction intensity Bs, effective permeability 渭 e, quality factor Q and tensile strength increase gradually at .650 鈩，

本文編號：1536244