本文關鍵詞： M型鍶永磁鐵氧體 鑭鋅取代 預燒溫度 鑭鈷取代 磁性　出處：《安徽大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著經(jīng)濟和科技的飛速發(fā)展,全球?qū)﹁F氧體的需求量越來越大,作為鐵氧體生產(chǎn)大國,生產(chǎn)高性能的鐵氧體卻是一個一直困擾著國人的難題,生產(chǎn)高性能鐵氧體的技術一直被日本TDK公司所掌握。國內(nèi)學者為了不落于人后,近幾十年一直對鐵氧體領域保持著很高的研究熱情。在所有鐵氧體材料中,由于M型鐵氧體具有高矯頑力、高磁能積、高磁晶各向異性、性能穩(wěn)定、價格便宜等優(yōu)點,很多產(chǎn)業(yè)的發(fā)展都對M型鐵氧體有著極高的依賴性。但是在實際應用中,人們發(fā)現(xiàn)M型鐵氧體的實際性能和理論值相比還有一定差距。在改善工藝設備等方面的同時,為了能夠更好的提高M型鐵氧體的磁性能,離子取代逐漸成為人們改善鐵氧體性能的主要手段。本論文的實驗中采用了傳統(tǒng)陶瓷法制備了鑭鋅取代的鍶永磁鐵氧體Sr1-xLaxFe12-yZnyO19,在配方中令x/y的值為4/3。首先研究了 La-Zn取代量對樣品Sr1-xLaxFe12-yZnyO19結(jié)構及磁性能的影響。接著研究Fe3+離子含量對樣品Sr0.84La0.16FexZn0.12O19結(jié)構及磁性能的影響。實驗結(jié)果顯示,Sr0.84La0.16Fe11.65Zn0.12O19具有較好的磁性能。改變預燒溫度探索溫度對樣品性能的影響。為了一步提升M型鍶鐵氧體的磁性能,在二次球磨時加入了添加劑SiO2、Al2O3,通過正交實驗改變添加劑含量,探索出最佳的添加劑含量。研究了非磁性離子Zn2+和La3+的聯(lián)合取代后,接著探索磁性離子Co2+和La3+的聯(lián)合取代在缺鐵配方下對M型鍶鐵氧體結(jié)構及性能的影響。結(jié)果顯示樣品Sr0.82 La0.18Fe11.70Co0.18O19具有較好的磁性能,在此基礎上改變預燒溫度,探究溫度對樣品性能的影響。利用X射線衍射儀、掃描電子顯微鏡(HITACHI S-4800型)、振動樣品磁強計以及B-H永磁測量分析儀(NIM-2000HF),對每組樣品的結(jié)構、微觀形貌及磁性能進行了測量和研究。實驗結(jié)果,總結(jié)為以下六點:1、鑭鋅取代M型鍶鐵氧體實驗中,隨著取代量的增加,晶格常數(shù)a值波動不大,晶格常數(shù)c的值隨著取代量的增加單調(diào)減小。在x=0.16,y=0.12時,剩余磁化強度Br取得最大值395.8 mT,內(nèi)稟矯頑力Hcj取得值為231.3 kA/m,磁感應矯頑力Hcb的值為224.7 kA/m,最大磁能積(BH)max獲得最大值29.44 kJ/m3。鑭鋅取代M型鍶鐵氧體的最佳配方為Sr0.84La0.16Fe11.88Zn0.12O19。2、在探究鐵離子含量變化對M型鐵氧體性能影響的實驗中,隨著Fe3+離子含量的改變,晶格常數(shù)a、c的值都幾乎沒有變化。當鐵的含量x=11.95時,出現(xiàn)雜峰。鐵的含量 x=11.65 時,M型鍶鐵氧體 Sr0.84La0.16FexZn0.12O19(11.35≤x≤11.95)獲得較好的磁性能;剩余磁化強度Br取得最大值414.2 mT,內(nèi)稟矯頑力Hcj取得最大值251.8 kA/m,磁感應矯頑力Hcb最大值236.2 kA/m,最大磁能積(BH)max獲得最大值31.75 kJ/m3。M型鍶鐵氧體的最佳配方是Sr0.84La0.16Fe11.65Zn0.12O19。3、以 Sr0.84La0.16Fe11.65Zn0.12O19為配方,制備樣品。分別設置 1190、1200、1210、1220、1230℃為預燒溫度,保溫3h。隨著預燒溫度的升高,樣品晶格常數(shù)a、c的值都緩慢增加。當溫度為1230℃時出現(xiàn)雜峰。當預燒溫度是1210℃時,樣品性能最好,剩余磁化強度Br取得最大值420.6 mT,內(nèi)稟矯頑力Hcj取得最大值262.1 kA/m,磁感應矯頑力Hcb取得最大值241.7 kA/m,最大磁能積(BH)max獲得最大值32.31 kJ/m3。4、以Sr0.84La0.16Fe11.65Zn0.12O19為配方,用傳統(tǒng)陶瓷法制備樣品。二次球磨時候加入添加劑SiO2、Al2O3。通過正交實驗選出最佳含量的添加劑是0.5wt%SiO2、0.5wt%Al2O3。這兩種添加劑可以降低樣品的剩余磁化強度Br,提高內(nèi)稟矯頑力Hcj。5、鑭鈷取代M型鍶鐵氧體實驗中,隨著取代量的增加,晶格常數(shù)a值波動不大,晶格常數(shù)c的值隨著取代量的增加單調(diào)減小;剩余磁化強度Br、內(nèi)稟矯頑力Hcj、磁感應矯頑力Hcb、最大磁能積(BH)max都呈現(xiàn)出先增大后減小的趨勢。在x=0.18,樣品綜合性能最好,即鑭鈷取代M型鍶鐵氧體的最佳配方為Sr0.82La0.18Fe11.70Co0.18O19。6、以 Sr0.82La0.18Fe11.70Co0.18O19為配方,制備樣品。分別設置 1190、1205、1220、1235、1250、1265℃為預燒溫度,保溫3h。隨著預燒溫度的升高,樣品晶格常數(shù)a、c的值都緩慢增加,剩余磁化強度Br、稟矯頑力Hcj、磁感應矯頑力Hcb、最大磁能積(BH)max都呈現(xiàn)出先增大后減小的趨勢。當溫度為119℃和1265℃時出現(xiàn)雜峰。1235℃時,樣品性綜合性能較好。
[Abstract]:With the rapid development of economy and technology, the global demand for ferrite increases, as ferrite producing countries, production of high performance ferrite is a difficult country, the production of high performance ferrite technology has been TDK Corporation in Japan. In order to grasp the domestic scholars not to fall behind, in recent decades has been on the ferrite field to keep the study enthusiasm is very high. In all of the ferrite material, because M ferrite with high coercivity, high magnetic energy product, high magnetocrystalline anisotropy, stable performance, low price, the development of many industries have a high dependence on M ferrite. But in practice, people found that there is still a certain gap M ferrite of the actual performance and the theoretical value. In the improvement of process equipment etc. at the same time, in order to improve the magnetic properties of M ferrite can better, ion Instead of gradually become the main means to improve the performance of ferrite people. This paper adopts the method of traditional ceramic zinc substituted lanthanum strontium ferrite Sr1-xLaxFe12-yZnyO19 was prepared, in the formula of x/y value for the 4/3. first studied the effect of La-Zn content on the structure and magnetic properties of the samples. Then the study of Fe3+ Sr1-xLaxFe12-yZnyO19 effect of ion content on the structure and magnetic properties of the samples of Sr0.84La0.16FexZn0.12O19. Experimental results show that Sr0.84La0.16Fe11.65Zn0.12O19 has better magnetic properties. The change of pre sintering temperature on the effect of temperature on sample performance. In order to further enhance the M type strontium ferrite magnetic properties in two milling adding additives SiO2, Al2O3, orthogonal the change of additive content, explore the best additive content was studied. Combined with non magnetic ions Zn2+ and La3+ replaced, then explore the magnetic ion Joint substitution effects on the structure and properties of M type strontium ferrite in iron deficiency formula. The results showed that Co2+ and La3+ sample Sr0.82 La0.18Fe11.70Co0.18O19 has better magnetic properties, based on the change of pre sintering temperature, explore the impact of temperature on the performance of the samples. By using X ray diffraction, scanning electron microscopy (HITACHI S-4800) B-H, vibrating sample magnetometer and magnetic analyzer (NIM-2000HF), the structure of each sample, the microstructure and magnetic properties were measured and analyzed. Experimental results are summarized in the following six points: 1, zinc lanthanum substituted M type strontium ferrite in the experiment, with the increase of the amount of substitution, the lattice constant a value small fluctuations, the lattice constant C value with the increase of the amount of substitution decreases monotonically. In x=0.16, y=0.12, residual magnetization Br has a maximum value of 395.8 mT, intrinsic coercivity Hcj value is 231.3 kA/m, the magnetic coercivity of Hcb The value is 224.7 kA/m, the maximum energy product (BH) max to get the best formula of the maximum value of 29.44 kJ/m3. substituted M type zinc lanthanum strontium ferrite is Sr0.84La0.16Fe11.88Zn0.12O19.2, in effect explore the changes of iron ion content on the properties of M ferrite in the experiment, with the content of Fe3+ ion, the lattice constant a, C value almost no change. When the content of x=11.95 iron, mixed peak. X=11.65 content of iron, M type strontium ferrite Sr0.84La0.16FexZn0.12O19 (x = 11.35 ~ 11.95) to obtain better magnetic properties; residual magnetization of Br has a maximum value of 414.2 mT, intrinsic coercivity Hcj has a maximum value of 251.8 kA/m, magnetic induction coercivity Hcb maximum 236.2 kA/m, the maximum energy product (BH) max maximum optimum formula of 31.75 kJ/m3.M type strontium ferrite is Sr0.84La0.16Fe11.65Zn0.12O19.3, based on Sr0.84La0.16Fe11.65Zn0.12O19 formula, the sample preparation were set up. 11901200121012201230 C for pre sintering temperature, thermal insulation 3h. with increasing calcination temperature, the lattice constant a, the value of C increased slowly. When the temperature is 1230 degrees centigrade mixed peak. When the calcination temperature is 1210 degrees, the best performance of the samples, the residual magnetization of Br has a maximum value of 420.6 mT, the intrinsic coercive the coercive force Hcj has a maximum value of 262.1 kA/m, the magnetic coercivity of Hcb has a maximum value of 241.7 kA/m, the maximum energy product (BH) max maximum value of 32.31 kJ/m3.4, with Sr0.84La0.16Fe11.65Zn0.12O19 formula, samples prepared by the conventional ceramic method. Two milling when adding additives SiO2, Al2O3. select the best additive content is by orthogonal experiment 0.5wt%SiO2,0.5wt%Al2O3. these two kinds of additives can reduce the residual magnetization of Br sample, the coercivity of Hcj.5 increase in lanthanum cobalt substituted M type strontium ferrite in the experiment, with the increase of the amount of substitution, the lattice constant a value Small fluctuations, the lattice constant C value with the increase of the amount of substitution decreases monotonously; residual magnetization Br, intrinsic coercivity Hcj, magnetic coercivity Hcb, the maximum energy product (BH) max exhibit increased first and then decreased. In x=0.18, the comprehensive performance of the best samples, namely lanthanum cobalt best the formula of M type strontium ferrite substituted for Sr0.82La0.18Fe11.70Co0.18O19.6, based on Sr0.82La0.18Fe11.70Co0.18O19 formula, preparation of samples. 119012051220123512501265 were set as C presintering temperature, thermal insulation 3h. with increasing calcination temperature, the lattice constant a, the value of C increased slowly, Br residual magnetization, coercivity Hcj, magnetic induction the coercivity of Hcb, the maximum energy product (BH) max exhibit increased first and then decreased. When the temperature is 119 DEG and 1265 DEG C mixed peak at.1235 C, the comprehensive performance of samples better.

【學位授予單位】：安徽大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM277

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