Microwave sintering of titanium diboride

Holcombe, C.E.; Dykes, Norman L

doi:10.1007/bf01184963

Cited by 52 publications

(19 citation statements)

References 4 publications

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“…Also, the absence of hardness enhancement in the composites is because of the lower hardness of the MoSi 2 phase (≈10 GPa for pure MoSi 2 ) as well as the presence of another brittle intermetallic phase, TiSi 2 . It can be noted here that high hardness of 19, 22–23, and 28 GPa were also reported for TiB 2 –10 vol% B 4 C, 9 TiB 2 –15 wt% TiC, 17 and TiB 2 –3 wt% CrB 2 15 composites, respectively.…”

Section: Resultssupporting

confidence: 76%

“…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%

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

Murthy

Basu

Balasubramaniam

et al. 2005

Journal of the American Ceramic Society

103

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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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Section: Resultssupporting

confidence: 76%

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

103

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“…Nearly fully dense polycrystalline TiB 2 can be produced by a variety of processing methods, including sintering [ 9 – 13 ], hot pressing [ 14 ], hot isostatic pressing [ 10 , 11 , 15 , 16 ], microwave sintering [ 17 ], and dynamic compaction [ 18 ]. The relatively strong covalent bonding of the constituents, however, results in low selfdiffusion rates.…”

Section: Materials Descriptionmentioning

confidence: 99%

“…Given the manner in which strength and toughness depend on density and grain size, it might be expected that the plastic deformation of the material under indentation would also exhibit a dependence on density and grain size. It is somewhat surprising, therefore, that a cursory examination of the data for the Vickers hardness [ 43 ]

of TiB 2 has no immediately perceptible dependence on either density or grain size [ 10 , 14 , 15 , 17 , 42 , 44 ]. P is the applied load and d is the length of the diagonal of the indentation impression.…”

Section: Mechanical and Thermal Propertiesmentioning

confidence: 99%

Material properties of titanium diboride

Munro

2000

J. Res. Natl. Inst. Stand. Technol.

827

345

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The physical, mechanical, and thermal properties of polycrystalline TiB2 are examined with an emphasis on the significant dependence of the properties on the density and grain size of the material specimens. Using trend analysis, property relations, and interpolation methods, a coherent set of trend values for the properties of polycrystalline TiB2 is determined for a mass fraction of TiB2 ⩾ 98 %, a density of (4.5±0.1) g/cm3, and a mean grain size of (9±1) µm.

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“…The only reported microwave sintering at Ͼ2100°C used a BN crucible as insulation. 10 The thermal conductivity of materials is significantly influenced by temperature and porosity (density); 11,12 therefore, one approach to decrease the thermal conductivity is to increase the porosity. When fabricating porous ceramics, it is beneficial to maximize the porosity while maintaining a reasonable strength.…”

Section: Issues In Insulation Design For Microwave Processingmentioning

confidence: 99%

Design and Construction of Insulation Configuration for Ultra‐High‐Temperature Microwave Processing of Ceramics

Olorunyolemi

Carmel

et al. 2003

Journal of the American Ceramic Society

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A multilayer insulation configuration suitable for microwave sintering of ceramics up to 2100°C was designed and tested successfully. The configuration is based on porous, granular BN/ZrO2 fiber composite powder for packed beds and spacer cylinders. This insulation allows stable, controlled microwave sintering and can be modified to microwave process materials with different thermal, dielectric properties with improved properties.

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Microwave sintering of titanium diboride

Cited by 52 publications

References 4 publications

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

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

Material properties of titanium diboride

Design and Construction of Insulation Configuration for Ultra‐High‐Temperature Microwave Processing of Ceramics

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Microwave sintering of titanium diboride

Cited by 52 publications

References 4 publications

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

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

Material properties of titanium diboride

Design and Construction of Insulation Configuration for Ultra‐High‐Temperature Microwave Processing of Ceramics

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Product

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

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