D0L:10.13374/.issn1001-053x.2012.03.003 第34卷第3期 北京科技大学学报 Vol.34 No.3 2012年3月 Journal of University of Science and Technology Beijing Mar.2012 热障涂层陶瓷材料La2（Zro.7Ceo.3)2O,的制备和 性能 项建英” 陈树海”黄继华》网梁文建” 曹艳军”汪瑞军2》何等2) 1)北京科技大学材料科学与工程学院，北京1000832)北京金轮坤天特种机械有限公司，北京100083 ☒通信作者，E-mail:jihuahuang47@sina.com 摘要研究了La,(2a,Cea:),0,(LZ7C3)的合成动力学及相结构，并根据合成过程中的损失对初始成分进行了设计，最终 制备出符合原子比La:Zx:Ce为10：7：3的LZ7C3粉末.用X射线衍射仪和场发射扫描电镜研究了样品的相成分和微观组织， 用激光脉冲法和推杆法测量了样品的热导率和热膨胀系数.结果表明：LZ7C3是由烧绿石结构的La,Z,0,(LZ)固溶体和萤石 结构的La2C20,(LC)固溶体组成，其中L☑固溶体是主相：热导率随着温度的升高而逐渐降低，在1473K时为0.79W·m1. K,较LZ降低了50%左右；热膨胀系数在1473K时为11.6×106K,比LZ提高了20%左右.这些优越的性能表明LZ7C3 是一种具有较大应用前景的新型热障涂层陶瓷材料. 关键词陶瓷；热障涂层：热导率：热膨胀 分类号TB174.4 Preparation and properties of La2(Zro.7 Ceo.3)2O,ceramic for thermal barrier coatings XIANG Jian-ying”,CHEN Shu-hai",HUANG Ji--hua”回，LIANG Wen-jian',CAO Yan-jun'”,WANG Rui-jun》,HE Qing2 1)School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Beijing Golden Wheel Special Machine Co.Ltd.,Beijing 100083,China Corresponding author,E-mail:jihuahuang47@sina.com ABSTRACT The synthesis kinetics and phase structure of La,(ZroCe),0,(LZ7C3)ceramic was investigated.The preparation composition was designed according to the mass loss in the synthesis process.LZ7C3 powder was prepared successfully by a solid state reaction method and its atom ratio of La:Zr:Ce is close to the theory value of 10:7:3.The phase composition,microstructure,and thermophysical properties of the powder were studied by X-ray diffraction (XRD),field emission scanning electron microscopy (FESEM),the laser-flash method and the pushing-rod method.XRD results reveal that 1Z7C3 is a mixture of LaZr2(LZ)with pyrochlore structure and La Ce2O(LC)with fluorite structure,and its main phase is the LZ solid solution.The thermal conductivity of 1Z7C3 decreases gradually with increasing temperature:at 1473K its value is0.79 WmK,which is almost 50%lower than that of LZ.The thermal expansion coefficient is 20%larger than that of IZ,and its value is 11.6x10K at 1473 K.These results show that 1Z7C3 ceramic can be explored as a novel prospective candidate material for use in new thermal barrier coating systems in the future. KEY WORDS ceramics;thermal barrier coatings:thermal conductivity:thermal expansion 热障涂层主要应用于航空发动机工业，具有良 流量比、高推重比及高进口温度方向发展，燃烧室中 好的隔热效果与高温抗氧化性能，是目前最为先进 的燃气温度不断提高，而目前广泛应用的表层陶瓷 的高温防护涂层之一，也是应用前景最好的表面防 材料8YSZ由于长期使用温度为1200℃，超过 护涂层之一可.近年来，随着航空燃气涡轮机向高 1200℃相变加剧，易烧结，导致涂层失效，已经难以 收稿日期：2011-02-28 基金项目：国家重点基础研究发展计划资助项目(613112)第 34 卷 第 3 期 2012 年 3 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 34 No． 3 Mar． 2012 热 障 涂 层 陶 瓷 材 料 La2 (Zr0. 7 Ce0. 3 )2 O7 的 制 备 和 性能 项建英1) 陈树海1) 黄继华1) 梁文建1) 曹艳军1) 汪瑞军2) 何 箐2) 1) 北京科技大学材料科学与工程学院，北京 100083 2) 北京金轮坤天特种机械有限公司，北京 100083 通信作者，E-mail: jihuahuang47@ sina． com 摘 要 研究了 La2 ( Zr0. 7Ce0. 3 ) 2O7 ( LZ7C3) 的合成动力学及相结构，并根据合成过程中的损失对初始成分进行了设计，最终 制备出符合原子比 La∶ Zr∶ Ce 为10∶ 7∶ 3的 LZ7C3 粉末． 用 X 射线衍射仪和场发射扫描电镜研究了样品的相成分和微观组织， 用激光脉冲法和推杆法测量了样品的热导率和热膨胀系数． 结果表明: LZ7C3 是由烧绿石结构的 La2Zr2O7 ( LZ) 固溶体和萤石 结构的 La2Ce2O7 ( LC) 固溶体组成，其中 LZ 固溶体是主相; 热导率随着温度的升高而逐渐降低，在 1 473 K 时为 0. 79 W·m － 1 · K － 1 ，较 LZ 降低了 50% 左右; 热膨胀系数在 1473K 时为11. 6 × 10 － 6 K － 1 ，比 LZ 提高了 20% 左右． 这些优越的性能表明 LZ7C3 是一种具有较大应用前景的新型热障涂层陶瓷材料． 关键词 陶瓷; 热障涂层; 热导率; 热膨胀 分类号 TB174. 4 Preparation and properties of La2 ( Zr0. 7 Ce0. 3 ) 2O7 ceramic for thermal barrier coatings XIANG Jian-ying1) ，CHEN Shu-hai 1) ，HUANG Ji-hua1) ，LIANG Wen-jian1) ，CAO Yan-jun1) ，WANG Rui-jun2) ，HE Qing2) 1) School of Materials Science and Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) Beijing Golden Wheel Special Machine Co． Ltd． ，Beijing 100083，China Corresponding author，E-mail: jihuahuang47@ sina． com ABSTRACT The synthesis kinetics and phase structure of La2 ( Zr0. 7Ce0. 3 ) 2O7 ( LZ7C3) ceramic was investigated． The preparation composition was designed according to the mass loss in the synthesis process． LZ7C3 powder was prepared successfully by a solid state reaction method and its atom ratio of La∶ Zr∶ Ce is close to the theory value of 10∶ 7∶ 3． The phase composition，microstructure，and thermophysical properties of the powder were studied by X-ray diffraction ( XRD) ，field emission scanning electron microscopy ( FESEM) ，the laser-flash method and the pushing-rod method． XRD results reveal that LZ7C3 is a mixture of La2Zr2O7 ( LZ) with pyrochlore structure and La2Ce2O7 ( LC) with fluorite structure，and its main phase is the LZ solid solution． The thermal conductivity of LZ7C3 decreases gradually with increasing temperature; at 1473K its value is 0. 79 W·m － 1 ·K － 1 ，which is almost 50% lower than that of LZ． The thermal expansion coefficient is 20% larger than that of LZ，and its value is 11. 6 × 10 － 6 K － 1 at 1 473 K． These results show that LZ7C3 ceramic can be explored as a novel prospective candidate material for use in new thermal barrier coating systems in the future． KEY WORDS ceramics; thermal barrier coatings; thermal conductivity; thermal expansion 收稿日期: 2011--02--28 基金项目: 国家重点基础研究发展计划资助项目( 613112) 热障涂层主要应用于航空发动机工业，具有良 好的隔热效果与高温抗氧化性能，是目前最为先进 的高温防护涂层之一，也是应用前景最好的表面防 护涂层之一［1--2］． 近年来，随着航空燃气涡轮机向高 流量比、高推重比及高进口温度方向发展，燃烧室中 的燃气温度不断提高，而目前广泛应用的表层陶瓷 材料 8YSZ 由于长期使用温度为 1 200 ℃，超 过 1 200 ℃相变加剧，易烧结，导致涂层失效，已经难以 DOI:10.13374/j.issn1001-053x.2012.03.003