Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

SURFACE & COATINGS TECHNOLOGY

卷:268

Article

Carpio, Pablo¹  Bannier, Emilie¹  Dolores Salvador, Maria²  Borrell, Amparo²  Moreno, Rodrigo³  Sanchez, Enrique¹ 

[1] Univ Jaume 1, Asociac Invest Ind Ceram AICE, Inst Tecnol Ceram, Castellon de La Plana 12006, Spain

[2] Univ Politecn Valencia, Inst Tecnol Mat, E-46022 Valencia, Spain

[3] CSIC, Inst Ceram & Vidrio, E-28049 Madrid, Spain

关键词: Suspension plasma spraying;    Yttria stabilised zirconia;    Thermal barrier coating;    Microstructure;    Indentation;   

DOI  :  10.1016/j.surfcoat.2014.08.063

来源: Elsevier

【 摘 要 】

In this work, aqueous suspension feedstocks with different particle size distribution from submicron- and nano-sized YSZ powders were prepared. A previous colloidal characterisation allowed concentrated suspensions (similar to 40 wt%) to be prepared. These suspensions were then successfully deposited by suspension plasma spraying (SPS) onto stainless steel substrates at different spraying distances. Coatings were characterised in terms of microstructure and mechanical properties (hardness and elastic modulus) by nanoindentation. All coatings displayed a two-zone microstructure formed by partially melted areas containing nanometre or submicrometre-sized particles surrounded by fully melted areas. These partially melted areas strongly increased as standoff distance lengthened. Mechanical properties worsened with spraying distance increase. The finer the feedstock particle size the more the spraying distance effect was. A clear correlation between mechanical properties and amount of partially melted areas has been proved. Thus the use of a mixture of nano/submicron-sized particles as a SPS feedstock can represent a good balance between suspension processability and final coating performance. (C) 2014 Elsevier B.V. All rights reserved.

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