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The Microstructure and Mechanical Properties of ZrO2-Al2O3 Thick Film Formed on the SUS304 Sheet Using Thermal Spray

Hirota, Ken and Ge, Xiaoteng and Kato, Masaki and Rifai, Muhammad and Miyamoto, Hiroyuki (2016) The Microstructure and Mechanical Properties of ZrO2-Al2O3 Thick Film Formed on the SUS304 Sheet Using Thermal Spray. Proceeding of Harris Foundation Research Presentation.

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Abstract

A ZrO2-Al2O3-based thick film has been formed on the SUS 304 stainless-steel sheet using a thermal spray in air (atmospheric plasma spraying: APS). The chemical composition of starting raw material (cubic ZrO2 solid solution: c-ZrO2(ss)) is 75mol%ZrO2(1.5mol%Y2O3)-25mol%Al2O3, which has been prepared by the neutralization co-precipitation method followed by the calcination of 1373 K(1100°C) for several hours in air for controlling their particle size to 50~100 µm. Three kinds of films with their thickness around 30 to 120 µm have been fabricated by increasing the number of soaking from 1, 3 and 5. X-ray diffraction (XRD), laser microscopy, scanning electron microscopy (SEM) revealed that the middle portion of films consisted of about 55 mass% Zr0.33Fe0.67O1.67, 34 mas% tetragonal ZrO2 (t-ZrO2), 8 mass% monoclinic ZrO2 (m-ZrO2), and 4 mass% -Al2O3; these crystalline phases might be explained by the decomposition of melting c-ZrO2 (ss) passing through the high temperature plasma, followed by the rapid thermal quenching on the substrate. The volume t-ZrO2 ratios vs. m-ZrO2 in the films are 65~80%, suggesting that high mechanical properties could be expected. Nano-indentation analysis showed Vickers hardness Hv of 12.8 and 14.3 GPa were achieved for 3 and 5 soaking-pass films, respectively. And also high fracture toughness has been expected from the high areas within the load-displacement curves that were obtained during nano-indentation. Thermal conductivity t of 9.4 W·m-1·K-1, which is much reduced from t (14.0 W·m-1·K 1) of SUS304, was attained for the 5-pass film. From these good mechanical and thermal properties, it has been proved that the thermal sprayed ZrO2-Al2O3 thick films formed on the metal substrates could have higher application capability.

Item Type: Article
Subjects: Daur Bahan Bakar Nuklir dan Bahan Maju > Bahan Struktur dan Bahan Maju > Teknik Sintesis Bahan Struktur
Divisions: Pusat Sains dan Teknologi Bahan Maju
Depositing User: EDITOR PSTBM BATAN
Date Deposited: 18 May 2018 01:22
Last Modified: 18 May 2018 01:22
URI: http://repo-nkm.batan.go.id/id/eprint/1273

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