發(fā)布時(shí)間：2019-06-28 15:27

【摘要】：FeSiAl磁粉芯具有價(jià)格低廉,軟磁性能優(yōu)異的特點(diǎn),在電力行業(yè)中特別是開(kāi)關(guān)電源技術(shù)上、濾波器、扼流器等電子元器件,具有廣泛的應(yīng)用。隨著電子元器件向高頻化、小型化、高功率化發(fā)展,對(duì)FeSiAl磁粉芯軟磁性能提出更高的要求,但是FeSiAl磁粉芯高頻下?lián)p耗高,易發(fā)熱,限制了其在高頻寬頻下應(yīng)用。FeSiAl磁粉芯的性能與粉末的狀態(tài),絕緣粘接,壓制成型以及退火工藝密切相關(guān),本論文針對(duì)FeSiAl磁粉芯存在的問(wèn)題開(kāi)展工作,通過(guò)探究粉末形貌和粒徑配比,獲取損耗最低的配比,在此基礎(chǔ)上添加不同的包覆粘接材料,探究包覆粘接工藝對(duì)磁粉芯性能的影響;探究合適的成型和熱處理工藝,獲取最優(yōu)的工藝參數(shù),制備出低損耗、高磁導(dǎo)率、高品質(zhì)因數(shù)的FeSiAl磁粉芯,并利用電子掃描顯微鏡、X射線衍射儀、軟磁交流測(cè)量?jī)x、PPMS等手段分析磁粉芯的性能,深入探究影響磁粉芯性能的機(jī)理。選取扁平狀粉末與絮狀粉末以及1:1混合粉末制備磁粉芯,研究表明扁平狀粉末制備的磁粉芯具有較好的軟磁性能,絮狀粉末性能最差,兩者混合粉末制備的磁粉芯性能處于兩者之間;選取兩種形貌的顆粒比值為1:2、1:1、2:1、3:1比例開(kāi)展實(shí)驗(yàn),發(fā)現(xiàn)隨著扁平狀粉末含量的增加,損耗降低,磁導(dǎo)率升高,磁粉芯軟磁性能提升。利用扁平化粉末制備磁粉芯,選取120目、200目、300目、400目等單一粒徑的扁平狀粉末制備磁粉芯,研究發(fā)現(xiàn)粉末粒徑越大,磁導(dǎo)率越高,損耗越高,500℃保溫0.5h,粒徑為120目的磁粉芯在f=65kHz,Bm=50mT條件下,損耗為80W/kg,磁導(dǎo)率為42.4,品質(zhì)因數(shù)為8.7;選取120目和200目的粉末混合,在兩者的比例為1:2時(shí),磁粉芯具有最佳的軟磁性能;選取120目、200目、300目粉末混合,在120目與200目?jī)烧叩谋壤秊?:2的基礎(chǔ)上,添加300目粉末,研究發(fā)現(xiàn)磁粉芯損耗增加,磁導(dǎo)率下降,但是品質(zhì)因數(shù)升高。粘接劑對(duì)磁粉芯的性能有很大影響,選取有機(jī)硅樹(shù)脂、水玻璃、DC-805抗高溫硅酮樹(shù)脂作為粘接劑,研究發(fā)現(xiàn)DC-805抗高溫硅酮樹(shù)脂制備的磁粉芯,具有最佳的軟磁性能,隨著粘接劑含量的增加,磁粉芯損耗降低,品質(zhì)因數(shù)升高,磁導(dǎo)率減小,粘接劑的含量為7%時(shí),磁粉芯的品質(zhì)因數(shù)較高。探究壓制壓力、保壓時(shí)間和升壓速度對(duì)磁粉芯的影響,在1200MPa壓制壓力下,磁粉芯的磁導(dǎo)率最高,損耗最低,磁粉芯磁導(dǎo)率隨著壓制壓力的增加呈現(xiàn)先升高后下降,磁粉芯的損耗呈現(xiàn)先下降后上升的趨勢(shì),保壓時(shí)間對(duì)磁粉芯性能沒(méi)有較大影響。退火是磁粉芯獲得優(yōu)良軟磁性能的有效手段,本論文通過(guò)選取300℃到800℃之間進(jìn)行熱處理,隨著溫度升高,磁導(dǎo)率增加趨勢(shì)變大,在700℃左右退火時(shí),磁粉芯磁導(dǎo)率達(dá)到最高,退火溫度繼續(xù)升高,磁導(dǎo)率下降;磁粉芯的損耗同時(shí)在下降,矯頑力在降低,磁粉芯在700℃退火后,f=65kHz,Bm=50mT條件下工作,損耗為14.6W/kg,品質(zhì)因數(shù)為65,磁導(dǎo)率為90。研究發(fā)現(xiàn)隨著測(cè)試溫度的升高,磁粉芯的磁導(dǎo)率會(huì)降低,但變化幅度較小,表明FeSiAl磁粉芯具有恒磁導(dǎo)率。
[Abstract]:The FeSiAl magnetic powder core has the characteristics of low price and excellent soft magnetic performance, and is especially used in the power industry, such as the switch power supply technology, the filter, the choke and other electronic components, and has wide application. With the development of high frequency, miniaturization and high power of electronic components, the soft magnetic properties of the FeSiAl magnetic powder core are required to be higher, but the high frequency of the FeSiAl magnetic powder core is high, the heating is easy, and the application of the FeSiAl magnetic powder core in high frequency and wide frequency is limited. The performance of the FeSiAl magnetic powder core is closely related to the state of the powder, the insulation bonding, the press forming and the annealing process. The influence of the coating bonding process on the properties of the magnetic powder core was investigated, and the appropriate forming and heat treatment process was explored to obtain the optimal process parameters, and the FeSiAl magnetic powder core with low loss, high magnetic permeability and high quality factor was prepared. The performance of magnetic powder core was analyzed by means of electronic scanning microscope, X-ray diffractometer, soft magnetic AC measuring instrument and PPMS. A magnetic powder core was prepared by mixing a flat powder with a flocculent powder and a 1:1 mixed powder, and the magnetic powder core prepared by the flat powder has good soft magnetic properties, and the floc powder has the worst performance, and the performance of the magnetic powder core prepared by the mixed powder of the two powders is between the two; The particle ratio of the two kinds of morphology was 1:2,1:1,2:1 and 3:1, and it was found that with the increase of the content of the flat powder, the loss was reduced, the magnetic permeability was increased, and the soft magnetic properties of the magnetic powder core were improved. A magnetic powder core is prepared by using a flat powder with a single particle size such as 120 mesh,200 mesh,300 mesh,400 mesh and the like. The magnetic powder core is prepared by using a flat powder of a single particle size such as 120 mesh,200 mesh,300 mesh,400 mesh and the like. The magnetic powder core is prepared by the method, the higher the magnetic permeability is, the higher the loss is, the thermal insulation at 500 DEG C for 0.5 h, the magnetic powder core with the particle size of 120 meshes at the condition of f = 65 kHz, Bm = 50 mT, the loss is 80 W/ kg, the magnetic permeability is 42.4 and the quality factor is 8.7; the powder mixture of 120 meshes and 200 meshes is selected; when the ratio of the two is 1:2, the magnetic powder core has the best soft magnetic property;120-mesh,200-mesh and 300-mesh powder are mixed, and the proportion of the 120-mesh,200-mesh and 300-mesh powder is 1:2, and the 300-mesh powder is added, The study found that the magnetic particle core loss increased and the magnetic permeability decreased, but the quality factor increased. The adhesive has a great influence on the properties of the magnetic powder core, and the organic silicon resin, the water glass and the DC-805 high-temperature silicone resin are selected as the adhesive, the magnetic powder core prepared by the DC-805 high-temperature silicone resin is found, the magnetic powder core has the best soft magnetic property, the loss of the magnetic powder core is reduced with the increase of the content of the adhesive, The quality factor of the magnetic powder core is high when the quality factor is increased, the magnetic permeability is reduced, and the content of the adhesive is 7%. the influence of the pressing pressure, the pressure maintaining time and the step-up speed on the magnetic powder core is explored, the magnetic permeability of the magnetic powder core is the highest and the loss is the lowest under the pressing pressure of 1200 MPa, the magnetic permeability of the magnetic powder core is reduced after the increase of the pressing pressure, the loss of the magnetic powder core is reduced, The pressure holding time has no great influence on the performance of the magnetic powder core. The annealing is an effective method for obtaining the excellent soft magnetic properties of the magnetic powder core. The thermal treatment is carried out between 300 鈩，

本文編號(hào)：2507405