掃描熱顯微鏡分析
(1. 蘇州有色金屬加工研究院，蘇州 215026;
2. Unité de Thermique et d′Analyse Physique, Laboratoire d’Energétique etd′Optique, Université de Reims,
BP 1039, 51687 Reims Cedex 2, France)
摘 要: 以納米結(jié)構(gòu)Y2O3穩(wěn)定的ZrO2熱噴涂粉末為原料, 采用等離子噴涂法在Ti-6Al-4V合金上制備了納米結(jié)構(gòu)的熱障涂層。利用掃描電鏡(SEM)及掃描熱顯微鏡(SThM)對(duì)涂層的微觀組織及熱性能進(jìn)行了分析。在實(shí)驗(yàn)基礎(chǔ)上建立了理論模型，并對(duì)涂層及基體的熱導(dǎo)率進(jìn)行了估算。結(jié)果表明：采用SThM分析方法估算的涂層厚度及涂層上的缺陷尺寸與采用其它分析方法測(cè)得的結(jié)果一致；雖然熱導(dǎo)率的估算結(jié)果與采用其它方法得出的結(jié)果差異較大，但顯示出掃描熱顯微鏡分析是估算材料熱導(dǎo)率潛在的方法。
關(guān)鍵字: 氧化釔; 氧化鋯涂層；等離子噴涂；掃描熱顯微鏡；熱導(dǎo)率
zirconia thermal barrier coating on Ti-6Al-4V alloy
analyzed by scanning thermal microscopy
（1. Suzhou Institute for Nonferrous Metals Processing Technology,Suzhou 215026, China;
2. Unité de Thermique et d′Analyse Physique, Laboratoire d′Energétique et
d′Optique, Université de Reims, BP 1039, 51687 Reims Cedex 2, France）
Abstract:Using nano-structure ytlria-stablilized ZrO2 powder, yttria-stabilized zirconia coatings were deposited on Ti-6Al-4V substrate by plasma spraying. The microstructure and thermal properties of the as-sprayed coating were characterized by scanning electronic microscopy (SEM) and scanning thermal microscopy (SThM). The analyses show that, the thickness and dimensions of the defects in coatings estimated by this method are in good agreement with those obtained using other analysis methods. Based on the experiments, the thermal probe was calibrated and thermal conductivities of the coating and substrate were estimated. The results and thermal conductivity estimation demonstrate that SThM analyses can be used as a potential tool for the thermal property and microstructure analysis of plasma-sprayed thermal barrier coating.
Key words: yttria; zirconia coating; plasma spraying; scanning thermal microscopy; thermal conductivity
