颜正,彭浩然,冀晓鹃,章德铭.Yb2Si2O7 前驱体及其低压等离子喷涂用粉末制备研究[J].热喷涂技术,2022,14(3):38~45.
Yb2Si2O7 前驱体及其低压等离子喷涂用粉末制备研究
Preparation of Yb2Si2O7 Precursor and Its Agglomerated Powderfor Low Pressure Plasma Spraying
  
DOI:DOI 10.3969/j.issn.1674-7127.2022.03-005
中文关键词:  环境障涂层  Yb2Si2O7  固相反应法  溶胶凝胶法  二流体雾化造粒
英文关键词:Environmental barrier coating  Yb2Si2O7  Solid-state reaction method  Sol-gel method  Atomization granulation
基金项目:
           
作者单位
颜正 矿冶科技集团有限公司
北京市工业部件表面强化与修复工程技术研究中心
特种涂层材料与技术北京市重点实验室
彭浩然 矿冶科技集团有限公司
北京市工业部件表面强化与修复工程技术研究中心
特种涂层材料与技术北京市重点实验室
冀晓鹃 矿冶科技集团有限公司
北京市工业部件表面强化与修复工程技术研究中心
特种涂层材料与技术北京市重点实验室
章德铭 矿冶科技集团有限公司
北京市工业部件表面强化与修复工程技术研究中心
特种涂层材料与技术北京市重点实验室
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中文摘要:
      本文分别采用固相反应法和溶胶凝胶法制备 Yb2Si2O7 前驱体粉末和陶瓷块材。 采用固相法时, 混合粉 末经 1500 ℃, 5 h 煅烧后由 Yb2Si2O7 和 Yb2SiO5 两相构成, 经冷压、 1600 ℃, 10 h 煅烧后得到疏松块材, 内部 残留大量未完全反应的氧化硅和中间相 Yb2SiO5。 采用溶胶凝胶法时, 退火态干凝胶经 1400 ℃, 5 h 煅烧后即可 获得高纯 Yb2Si2O7 粉末, 经冷压、 1600 ℃, 10 h 煅烧后, 得到近 Yb2Si2O7 纯相的、 更完整致密块材。 这些表明 相较于固相反应法, 溶胶凝胶法制备 Yb2Si2O7 具有反应门槛较低、 易制得高纯均匀材料的优势。 进一步, 采用 二流体雾化工艺制备低压等离子喷涂用粉末, 重点探索了 PVA 含量和雾化压力对粉末的影响规律。 结果表明, PVA 含量决定粉末形貌, 当 PVA 含量适中时 (10 wt.%) 可获得球形度良好的实心粉末, 雾化压力决定粉末粒度, 雾化压力越大, 粉末粒径越细, 当雾化压力为 1.2 MPa 时, 可获得所需的 1~30 μm 超细粉末。
英文摘要:
      In this paper, Yb2Si2O7 precursor powders and ceramic bulks were respectively prepared by solid-state reaction method and sol-gel method. By solid-state reaction method, the mixed powder was calcined at 1500 ℃ for 5 h and turned out to be a mixture of Yb2Si2O7 and Yb2SiO5. After cold pressing and 1600 ℃ sintering for 10 h, loose bulk was obtained where a large amount of silicon oxide and Yb2SiO5 were found inside. By contrast, high purity Yb2Si2O7 powder could be obtained by the sol gel method after the dry gel was calcined at 1400 ℃ for 5h. After cold pressing and 1600 ℃ sintering for 10 h, a more dense and compact bulk with almost pure Yb2Si2O7 phase was obtained. These results indicate that the preparation of Yb2Si2O7 by sol-gel method has the advantages of low reaction threshold and easy preparation of high-purity homogeneous materials. The ultra-fine powder for low pressure plasma spraying was prepared by atomization granulation. The influence of PVA content and atomization pressure on the powder was investigated. The results showed that the powder morphology was determined by PVA content. Only when the PVA content was moderate (10 wt.%), a solid powder with good sphericity could beobtained. The atomization pressure strongly affected the powder particle size. The larger the atomization pressure, the smaller the powder particle size. When the atomization pressure was 1.2 MPa, the desirable powders with 1~30 μm could be obtained.
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