Kitiwan, Mettaya

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Kitiwan, Mettaya
Alternative Name
Kitiwan, M.
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Email
mettaya.ki@kmitl.ac.th

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    Item type:Publication,
    Effect of AlN addition on the reaction sintering of Al2TiO5 composites fabricated by spark plasma sintering
    (2023-01-01)
    Kitiwan, Mettaya
    ;
    Atong, Duangduen
    ;
    Endo, Fumio
    ;
    Goto, Takashi
    Fully dense Al<inf>2</inf>TiO<inf>5</inf>–Al<inf>2</inf>O<inf>3</inf>–TiN (ATN) composites were fabricated by reactive sintering using spark plasma sintering at 1400°C for 5 min under 100 MPa in vacuum. An equimolar ratio of Al<inf>2</inf>O<inf>3</inf>:TiO<inf>2</inf> was used as the starting powder, while the addition of 0–36 mol% AlN was investigated. The thermodynamic calculation indicates that the initial reaction was that of TiO<inf>2</inf> and AlN, forming TiN and Al<inf>2</inf>O<inf>3</inf>, and then the remaining TiO<inf>2</inf> reacted with Al<inf>2</inf>O<inf>3</inf> to produce Al<inf>2</inf>TiO<inf>5</inf>. With the increase in AlN precursor, Al<inf>2</inf>TiO<inf>5</inf> gradually decreased, while Al<inf>2</inf>O<inf>3</inf> and TiN increased. The lattice parameters of Al<inf>2</inf>TiO<inf>5</inf> were enlarged with AlN addition, implying the incorporation of N atoms in the Al<inf>2</inf>TiO<inf>5</inf> unit cell. The addition of AlN effectively produced fully densified bodies with small grain size, and microcrack-free, which therefore enhanced the mechanical properties of ATN composites. At 36 mol% AlN addition, the composite shows Vickers hardness and fracture toughness of 16.26 ± 1.61 GPa and 5.20 ± 0.46 MPa.m<sup>1/2</sup>, respectively.
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    EFFECT OF h-BN AS AN ADDITIVE ON PHYSICAL AND MECHANICAL PROPERTIES OF Al2TiO5 COMPOSITE
    (2023-01-01)
    Treetornkeerati, Paramapat
    ;
    Hankoy, Montree
    ;
    Kitiwan, Mettaya
    ;
    Rodchom, Mana
    ;
    Vichaphund, Supawan
    Aluminum titanate (Al<inf>2</inf>TiO<inf>5</inf>) is a promising material for high-temperature applications due to its low thermal expansion, high melting point, and excellent corrosion resistance. In this study, the effect of h-BN addition on the properties of Al<inf>2</inf>TiO<inf>5</inf> composites was investigated. The composites were prepared by sintering a mixture of Al<inf>2</inf>O<inf>3</inf> and TiO<inf>2</inf> at a 1:1 molar ratio, with varying amounts of h-BN (5-20 mol%) added to the mixture. The samples were sintered at 1,500ºC for 4 h in N<inf>2</inf> atmosphere, and the bulk density, porosity, phase transition, microstructure, flexural strength, and hardness of the composites were investigated. XRD analysis confirmed the presence of Al<inf>2</inf>TiO<inf>5</inf>, Al<inf>2</inf>O<inf>3</inf>, and Al<inf>18</inf>B<inf>4</inf>O<inf>33</inf> phases in the composites. The addition of h-BN in increasing amounts from 5 to 20 mol% resulted in a gradual improvement in the bulk density, flexural strength, and hardness of the Al<inf>2</inf>TiO<inf>5</inf> composites. The composite with the highest h-BN content (20 mol%) exhibited a bulk density of 3.12 g/cm<sup>3</sup>, as well as the highest flexural strength and hardness values of 123.6±8.9 MPa and 11.2±4.1 GPa, respectively.