镁基六铝酸镧陶瓷强化烧结和熔盐腐蚀行为
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摘要
采用二步固相高温烧结法制备镁基六铝酸镧(LaMgAl_(11)O_(19))陶瓷材料,并在1050℃稀土氟化物熔盐体系中进行腐蚀试验。利用X射线衍射仪、扫描电子显微镜、EDX能谱仪等表征手段测试分析烧结试样的物相组成和显微结构以及腐蚀试样的物相组成、表层形貌和元素分布。研究烧结温度对LaMgAl_(11)O_(19)陶瓷试样微观组织和耐熔盐腐蚀性能的影响,探讨LaMgAl_(11)O_(19)陶瓷材料的熔盐腐蚀行为。结果表明,随着烧结温度的提高,LaMgAl_(11)O_(19)陶瓷相对密度增加,腐蚀样中稀土氟化物特征熔盐CeF_3渗透量减少;1700℃烧结后,陶瓷体相对密度为87.6%,1050℃混合稀土氟化物熔盐电解质体系腐蚀24 h,腐蚀样中CeF_3质量分数为2.37%;熔盐腐蚀层厚度约为30μm左右。
LaMgAl_(11)O_(19) ceramics were synthesized by a two-step solid sintering method and their corrosion resistance in rare earth fluoride fused salt at 1050 ℃ was studied. The crystal phase and microstructure after sintering,surface morphology and composition after corrosion were characterized by using X-ray diffraction,scanning electron microscope and energy dispersive X-ray spectroscopy. The effect of sintering temperature on microstructure and corrosion resistance to rare earth fluoride for LaMgAl_(11)O_(19) ceramics was investigated. The fused salt corrosion behavior was also discussed. The results showed the relative density of sample increases and CeF_3 mass percentage after corrosion decreases with the increase of sintering temperature. The relative density of LaMgAl_(11)O_(19) ceramics is 87. 6% at 1700 ℃. The CeF_3 mass percentage is 2. 37% and the corrosion depth is about 30 μm at 1700 ℃.
LaMgAl_(11)O_(19) ceramics were synthesized by a two-step solid sintering method and their corrosion resistance in rare earth fluoride fused salt at 1050 ℃ was studied. The crystal phase and microstructure after sintering,surface morphology and composition after corrosion were characterized by using X-ray diffraction,scanning electron microscope and energy dispersive X-ray spectroscopy. The effect of sintering temperature on microstructure and corrosion resistance to rare earth fluoride for LaMgAl_(11)O_(19) ceramics was investigated. The fused salt corrosion behavior was also discussed. The results showed the relative density of sample increases and CeF_3 mass percentage after corrosion decreases with the increase of sintering temperature. The relative density of LaMgAl_(11)O_(19) ceramics is 87. 6% at 1700 ℃. The CeF_3 mass percentage is 2. 37% and the corrosion depth is about 30 μm at 1700 ℃.
引文
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[19]房俊卓,张霞,徐崇福.实验条件对X射线衍射物相定量分析结果的影响[J].岩矿测试,2008,27(1):60-62.Fang J Z,Zhang X,Xu C F.Effect of experimental conditions on X-ray diffractometric quantitative phase analysis[J].Rock and Neral Analysis,2008,27(1):60-62.
[2]谢敏,宋希文,赵鸣,等.镁基六铝酸镧的合成及其热物理性能研究[J].中国稀土学报,2010,28(专辑):302-305.Xie M,Song X W,Zhao M,et al.Synthesis and thermophysical properties of lanthanum magnesium hexaaluminate[J].Journal of the Chinese Society of Rare Earths,2010,28(Spec.Issue):302-305.
[3]齐峰,樊自拴,孙冬柏,等.新型热障涂层材料镁基六铝酸镧喷涂粉末的制备[J].材料工程,2006,(7):14-18.Qi F,Fan Z S,Sun D B,et al.Preparation of La Mg Al11O19spray powder-a new thermal barrier coatings material[J].Journal of Materials Engineering,2006,(7):14-18.
[4]Wang Y H,Ouyang J H,Liu Z G.Preparation and thermo-physical properties of La1-xNdxMg Al11O19(x=0,0.1,0.2)ceramics[J].Journal of Alloys and Compounds,2009,485(1-2):734-738.
[5]姜斌,房明浩,黄朝晖,等.Gd3+掺杂La1-xGdxMg Al11O19(x=0~1)陶瓷的制备及热学性能[J].硅酸盐学报,2010,38(7):1263-1267.Jiang B,Fang M H,Huang Z H,et al.Preparation of Gd3+doped La1-xGdxMg Al11O19(x=0~1)ceramics and its thermal properties[J].Journal of the Chinese Ceramic Society,2010,38(7):1263-1267.
[6]Chen X L,Gu L J,Zou B L,et al.New functionally graded thermal barrier coating system based on La Mg Al11O19/YSZ prepared by air plasma spraying[J].Surface and Coatings Technology,2012,206(8-9):2265-2274.
[7]Lu H R,Wang C G,Zhang C G.Influence of Ln3+and B3+ions co-substitution on thermophysical properties of Ln MB11O19-type magnetoplumbite La Mg Al11O19for advanced thermal barrier coatings[J].Journal of the American Ceramic Society,2013,96(4):1063-1066.
[8]Cui J J,Ouyang J H,Liu Z G.Hot corrosion behavior of La Mg Al11O19ceramic coated with molten CMAS deposits at temperature of 1250℃in air[J].Journal of Alloys and Compounds,2016,685:316-321.
[9]You H P,Song Y H,Jia G,et al.Energy transfer from Tb3+to Mn2+in La Mg Al11O19:Tb,Mn phosphors[J].Optical Materials,2008,31(2):342-345.
[10]Wang B Y,Xu J Z,Chen H,et al.Luminescence properties of La Mg Al11O19∶Mn2+and La Mg Al11O19∶RE,Mn2+(RE=Eu2+,Gd3+)under UV/VUV excitation[J].Rare Metal Materials and Engineering,2009,38(3):0389-0392.
[11]徐进章,张志华,王育华.助熔剂法制备的La Mg Al11O19∶Eun+(n=2,3)的发光特性[J].无机化学学报,2006,22(5):913-916.Xu J Z,Zhang Z H,Wang Y H.Photoluminescence of La Mg Al11O19∶Eun+(n=2,3)phosphor synthesized by flux method[J].Chinese Journal of Inorganic Chemistry,2006,22(5):913-916.
[12]黄德信,冯涛,徐海芳,等.氧化镁的耐熔盐腐蚀特性研究[J].稀有金属材料与工程,2007,36(S2):355-357.Huang D X,Feng T,Xu H F,et al.The study of anticorrosion ability of Mg O in molten salt[J].Rare Metal Materials and Engineering,2007,36(S2):355-357.
[13]周科朝,陶玉强,刘宝刚,等.铁酸镍基金属陶瓷的强化烧结与熔盐腐蚀行为[J].中国有色金属学报,2011,21(6):1348-1358.Zhou K C,Tao Y Q,Liu B G,et al.Enhanced sintering and molten salt corrosion behavior of nickel ferrite based cermets[J].The Chinese Journal of Nonferrous Metals,2011,21(6):1348-1358.
[14]沈振江,邴丽娜,傅军,等.热处理对氧化铝陶瓷耐盐酸腐蚀性的影响[J].绝缘材料,2012,45(4):38-41.Shen Z J,Bing L N,Fu J,et al.Effect of heat treatment on the corrosion resistance of alumina ceramics to hydrochloride[J].Insulating Materials,2012,45(4):38-41.
[15]鲁飞,刘树峰,孙良成,等.氧化钇陶瓷的热压烧结和耐蚀行为[J].稀土,2016,37(5):142-146.Lu F,Liu S F,Sun L C,et al.Hot-press sintering and corrosion resistance behavior of yttria ceramic[J].Chinese Rare Earths,2016,37(5):142-146.
[16]王昊,周科朝,李志友,等.Ni Fe2O4-Ni O复合陶瓷的熔盐腐蚀行为[J].粉末冶金材料科学与工程,2012,17(2):263-269.Wang H,Zhou K C,Li Z Y,et al.Molten salt corrosion behavior of Ni Fe2O4-Ni O composite ceramics[J].Materials Science and Engineering of Powder Metallurgy,2012,17(2):263-269.
[17]Zhang Y F,Li Q,Ma X F,et al.Synthesis and highpressure sintering of Lanthanum magnesium hexaaluminate[J].Materials Letters,2008,62(6-7):923-925.
[18]郭胜利,靳跃鹏,赵浩峰.锌铝基镁铅合金块状固体的物相组成和质量分数标定[J].材料导报:研究篇,2009,23(2):64-67.Guo S L,Jin Y P,Zhao H F.Determination of phase composition and mass fraction of bulk znic-alanium based magnesium-lead alloy[J].Materials Review,2009,23(2):64-67.
[19]房俊卓,张霞,徐崇福.实验条件对X射线衍射物相定量分析结果的影响[J].岩矿测试,2008,27(1):60-62.Fang J Z,Zhang X,Xu C F.Effect of experimental conditions on X-ray diffractometric quantitative phase analysis[J].Rock and Neral Analysis,2008,27(1):60-62.