Hot isostatic pressing of TiB2-ZrO2(2 mol% Y2O3) composite powders

Muraoka, Yoshiyuki; Yoshinaka, Masaru; Hirota, Ken; Yamaguchi, Osamu

doi:10.1016/0025-5408(96)00069-4

Cited by 36 publications

(19 citation statements)

References 6 publications

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“…24 Amongst the different forms of titanium boride, there has been heightened interest in developing uses for TiB 2 . The compaction can be realized by several methods, ranging from hot isostatic pressing 31 and microwave sintering 32 to dynamic compaction. 23 On top of that, TiB 2 has also been recognized for its high strength, durability and resistance to erosion, 25,26 properties which are likely attributed to the simultaneous existence of metallic, ionic and covalent characteristics in this boride compound.…”

Section: Introductionmentioning

confidence: 99%

Layered titanium diboride: towards exfoliation and electrochemical applications

et al. 2015

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Layered transition metal diborides (TMDB), amongst other refractory metal borides, are commonly employed for material fabrication such as wear- and corrosion-resistant coatings due to their impressive chemical stability and thermal conductivity. In spite of the wide scope of studies carried out on TMDB in the physical field, investigations on its electrochemistry remain limited. Since the physical properties play a vital role in any material's electrochemical behaviour, we explore the viability of the most popular form of titanium boride, layered TiB2, as catalysts for electrochemical energy reactions, including hydrogen evolution and oxygen reduction. Three types of TiB2 were compared in this work - TiB2 separately modified with sodium naphtalenide and butyllithium in an attempt to exfoliate TiB2 and unmodified TiB2. The electrocatalytic activity displayed by all three TiB2 materials provides a wider range of opportunities for the application of TiB2 in material studies.

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Section: Introductionmentioning

confidence: 99%

Layered titanium diboride: towards exfoliation and electrochemical applications

et al. 2015

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“…Different non‐metallic additives such as AlN, 5 ZrO 2 , 6–12 SiC, 8,10,12,13 Si 3 N 4 , 14 CrB 2 , 15 B 4 C, 9,16 TaC, 17 TiC, 17,18 WC, 17 TiN, 17 ZrN, 17 and ZrB 2 17 have been used for attaining densification of TiB 2 with good mechanical properties. Torizuka and Kishi 8 and Torizuka et al 12 observed the formation of grain‐boundary liquid phase (amorphous SiO 2 ) when SiC was used as an additive.…”

Section: Introductionmentioning

confidence: 99%

Processing and Properties of TiB₂ with MoSi₂ Sinter‐additive: A First Report

Murthy

Basu

Balasubramaniam

et al. 2005

Journal of the American Ceramic Society

104

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The densification of non‐oxide ceramics like titanium boride (TiB2) has always been a major challenge. The use of metallic binders to obtain a high density in liquid phase‐sintered borides is investigated and reported. However, a non‐metallic sintering additive needs to be used to obtain dense borides for high‐temperature applications. This contribution, for the first time, reports the sintering, microstructure, and properties of TiB2 materials densified using a MoSi2 sinter‐additive. The densification experiments were carried out using a hot‐pressing and pressureless sintering route. The binderless densification of monolithic TiB2 to 98% theoretical density with 2–5 μm grain size was achieved by hot pressing at 1800°C for 1 h in vacuum. The addition of 10–20 wt% MoSi2 enables us to achieve 97%–99%ρth in the composites at 1700°C under similar hot‐pressing conditions. The densification mechanism is dominated by liquid‐phase sintering in the presence of TiSi2. In the pressureless sintering route, a maximum of 90%ρth is achieved after sintering at 1900°C for 2 h in an (Ar+H2) atmosphere. The hot‐pressed TiB2–10 wt% MoSi2 composites exhibit high Vickers hardness (∼26–27 GPa) and modest indentation toughness (∼4–5 MPa·m1/2).

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“…The t ‐YSZ material has high flexural strength and fracture toughness, but the relatively low hardness and poor low‐temperature degradation limit its applications 20 . That Si 3 N 4 , Al 2 O 3 , and TiB 2 added into YSZ can improve the mechanical properties hase been reported by other researchers 21–23 . In this study, TiN addition can further improve the mechanical properties of 3 mol% yttria‐stabilized zirconia (3YSZ) ceramics, because TiN has high hardness, high wear resistance, high corrosion resistance, and high specific strength 24 .…”

Section: Introductionmentioning

confidence: 78%

The m–t Transformation and Twinning Analysis of Hot‐Pressed Sintered 3YSZ Ceramics

Chiang

2011

Journal of the American Ceramic Society

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Microstructures of 3 mol% yttria‐stabilized zirconia (3YSZ) with different content of TiN were investigated in this study by XRD, SEM, and TEM. The specimens were hot‐pressing sintered at 1450°C for 2.5 h under 50 MPa in vacuum, and then further characterized on microstructure change and phase distribution. The TiN added to 3YSZ can suppress tetragonal (t) to monoclinic (m)‐3YSZ phase transformations, reduce 3YSZ grain size, and improve its mechanical properties. The ceramic was formed of homogeneously dispersed 3YSZ and TiN grains with average size of 0.7 and 1 μm, respectively. The coexistence of t‐ and m‐phases was observed in one grain, and the nucleation of m‐phase with acicular twin occurred preferentially at grain boundaries of t‐phase. The TEM analysis was focused on the 3YSZ–30 wt% TiN specimens in order to identify the relationships between t‐ and m‐structures, and twin structures of m‐phase. Two crystallographic relations of t‐ to m‐transformation are (100)m//(110)t, [010]m//[001]t in type I, and (100)m//(110)t, [001]m//[001]t in the type II. The acicular (100)m and lathlike (110)m twins in m‐phase were also observed.

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Hot isostatic pressing of TiB2-ZrO2(2 mol% Y2O3) composite powders

Cited by 36 publications

References 6 publications

Layered titanium diboride: towards exfoliation and electrochemical applications

Layered titanium diboride: towards exfoliation and electrochemical applications

Processing and Properties of TiB₂ with MoSi₂ Sinter‐additive: A First Report

The m–t Transformation and Twinning Analysis of Hot‐Pressed Sintered 3YSZ Ceramics

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Hot isostatic pressing of TiB2-ZrO2(2 mol% Y2O3) composite powders

Cited by 36 publications

References 6 publications

Layered titanium diboride: towards exfoliation and electrochemical applications

Layered titanium diboride: towards exfoliation and electrochemical applications

Processing and Properties of TiB2 with MoSi2 Sinter‐additive: A First Report

The m–t Transformation and Twinning Analysis of Hot‐Pressed Sintered 3YSZ Ceramics

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Product

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Processing and Properties of TiB₂ with MoSi₂ Sinter‐additive: A First Report