CN106045511A - 一种低热导率陶瓷Ca6SnTa4O18及其制备方法 - Google Patents
一种低热导率陶瓷Ca6SnTa4O18及其制备方法 Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000000919 ceramic Substances 0.000 title abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 6
- 238000000498 ball milling Methods 0.000 claims abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 6
- 239000012153 distilled water Substances 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract 4
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract 2
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 claims abstract 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 229940068984 polyvinyl alcohol Drugs 0.000 claims 2
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims 2
- 238000000465 moulding Methods 0.000 claims 1
- 239000012720 thermal barrier coating Substances 0.000 abstract description 14
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 4
- 238000005245 sintering Methods 0.000 abstract description 4
- 235000010216 calcium carbonate Nutrition 0.000 abstract 1
- 238000000748 compression moulding Methods 0.000 abstract 1
- 238000005469 granulation Methods 0.000 abstract 1
- 230000003179 granulation Effects 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005328 electron beam physical vapour deposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
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- C04B35/495—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates
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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3293—Tin oxides, stannates or oxide forming salts thereof, e.g. indium tin oxide [ITO]
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Abstract
本发明公开了一种具有低热导率与较高热膨胀系数的热障涂层陶瓷材料Ca6SnTa4O18及其制备方法。（1）将纯度为99.9%（重量百分比）以上的 CaCO3、SnO2和Ta2O5的原始粉末按Ca6SnTa4O18的组成称量配料。（2）将步骤（1）原料湿式球磨混合12小时，球磨介质为蒸馏水，烘干后在1500℃大气气氛中预烧6小时。（3）在步骤（2）制得的粉末中添加粘结剂并造粒后，再压制成型，最后在1550~1600℃大气气氛中烧结8小时；所述的粘结剂采用质量浓度为5%的聚乙烯醇溶液,聚乙烯醇添加量占粉末总质量的3%。本发明制备的陶瓷烧结性好,结构稳定；其热导率远低于YSZ,而热膨胀系数则远大于YSZ，在先进航空发动机热障涂层系统具有重要的应用价值。
Description
技术领域
本发明涉及低热导率陶瓷材料，特别是涉及用于保护先进涡轮发动机高温金属部件的热障涂层陶瓷材料及其制备方法。
背景技术
采用等离子喷涂方法或电子束物理气相沉积技术制备的热障涂层系统(ThermalBarrier Coatings,简称TBCs)，由于能保护先进涡轮发动机高温金属部件并提高燃油经济性，在先进航空发动机的发展过程中举足轻重。目前,传统的氧化钇能部分稳定氧化锆(简称YSZ)热障涂层，在高温下长期服役过程中，T-四方相转化为正方和立方相，而且在冷却过程中，T相将近一步转变为单斜相。这类相变将加速表面涂层的烧结收缩，降低隔热性能。此外，YSZ低的热膨胀系数(约为10×10-6 K-1)引起的涂层与金属基体（如镍基超级合金，热膨胀系数约为16×10-6 K-1)之间的热膨胀失配,已被公认为涂层失效的最强的因素之一。
为了克服YSZ的缺点并进一步提高运营效率，迫切需要研制一种热导率小于YSZ的新型热障涂层陶瓷。新型热障涂层材料的选择受一些基本要求的限制，如高熔点、在服役温度至工作温度范围内的无相变、较低的热导率、较高的热膨胀系数、良好的耐腐蚀性能、抗热震性能和较低的烧结能力。然而，找到一种能同时满足所有要求的陶瓷材料非常困难。目前，许多研究人员把较低的热导率、较高的热膨胀系数作为选择新型热障涂层陶瓷材料的首要条件。
发明内容
本发明的目的是提供一种具有低热导率与高热膨胀系数的陶瓷材料及其制备方法。
本发明的低热导率与高热膨胀系数陶瓷的化学组成为Ca6SnTa4O18。
本热障涂层陶瓷材料的制备方法步骤为：
（1）将纯度为99.9%（重量百分比）以上的CaCO3、SnO2和Ta2O5的原始粉末按Ca6SnTa4O18的组成称量配料。
（2）将步骤（1）原料湿式球磨混合12小时，球磨介质为蒸馏水，烘干后在1500℃大气气氛中预烧6小时。
（3）在步骤（2）制得的粉末中添加粘结剂并造粒后，再压制成型，最后在1550~1600℃大气气氛中烧结8小时；所述的粘结剂采用质量浓度为5%的聚乙烯醇溶液，聚乙烯醇添加量占粉末总质量的3%。
本发明的优点：Ca6SnTa4O18陶瓷烧结性好, 结构稳定；1300℃时其热导率低到1.19W.m-1.k-1，其热膨胀系数达到14.1×10-6 K-1。Ca6SnTa4O18陶瓷热导率远低于YSZ, 而其热膨胀系数则远大于YSZ，在热障涂层材料领域具有重要的应用价值。
具体实施方式
实施例：
表1示出了构成本发明的不同烧结温度的3个具体实施例及其1300℃时的热导率和热膨胀系数。其制备方法如上所述，用激光脉冲法和推杆法分别测试其热导率和热膨胀系数。结果表明，合成的Ca6SnTa4O18陶瓷1300℃时的热导率远低于YSZ （3.0W.m-1.k-1），而其热膨胀系数则远大于YSZ，有望成为新型热障涂层材料，可满足先进航空发动机热障涂层系统技术需要。
表1：
Claims (1)
1.一种低热导率与高膨胀系数陶瓷，其特征在于所述陶瓷的化学组成为：Ca6SnTa4O18；
所述低热导率与高膨胀系数陶瓷的制备方法具体步骤为：
（1）将纯度为99.9%（重量百分比）以上的 CaCO3、SnO2和Ta2O5的原始粉末按Ca6SnTa4O18的组成称量配料；
（2）将步骤（1）原料湿式球磨混合12小时，球磨介质为蒸馏水，烘干后在1500℃大气气氛中预烧6小时；
（3）在步骤（2）制得的粉末中添加粘结剂并造粒后，再压制成型，最后在1550~1600℃大气气氛中烧结8小时；所述的粘结剂采用质量浓度为5%的聚乙烯醇溶液，聚乙烯醇添加量占粉末总质量的3%。
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002014580A2 (en) * | 2000-08-17 | 2002-02-21 | Siemens Westinghouse Power Corporation | Thermal barrier coating having high phase stability |
| CN1764613A (zh) * | 2003-03-26 | 2006-04-26 | 三菱重工业株式会社 | 隔热涂层材料 |
| CN1966462A (zh) * | 2006-11-24 | 2007-05-23 | 北京航空航天大学 | 一种层状钙钛矿结构的热障涂层陶瓷层材料 |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002014580A2 (en) * | 2000-08-17 | 2002-02-21 | Siemens Westinghouse Power Corporation | Thermal barrier coating having high phase stability |
| CN1764613A (zh) * | 2003-03-26 | 2006-04-26 | 三菱重工业株式会社 | 隔热涂层材料 |
| CN1966462A (zh) * | 2006-11-24 | 2007-05-23 | 北京航空航天大学 | 一种层状钙钛矿结构的热障涂层陶瓷层材料 |
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