Preferential Grain Orientation in Hot Pressed TiB<sub>2</sub>

Jensen, Morten Sundheim; Einarsrud, Mari‐Ann; Grande, Tor

doi:10.1111/j.1551-2916.2007.01623.x

Cited by 35 publications

(15 citation statements)

References 16 publications

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“…What is more, it can be seen that the degree of orientation quantitatively was increased with elevated temperatures. Similar preferential grain orientation with [001] direction parallel to the mechanical field has been reported in other hot‐pressed ceramics with hexagonal structures . According to these literatures, the preferential orientation in the hot‐pressed ceramics is due to growth of grains with the preferred orientation.…”

Section: Resultssupporting

confidence: 79%

“…Similar preferential grain orientation with [001] direction parallel to the mechanical field has been reported in other hot-pressed ceramics with hexagonal structures. 19 According to these literatures, the preferential orientation in the hot-pressed ceramics is due to growth of grains with the preferred orientation. Growth of the grains with the closely packed atomic layers perpendicular to the stress axis is energetically favorable, which is also confirmed in our study.…”

Section: Resultsmentioning

confidence: 99%

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Densification Behavior, Phase Transition, and Preferred Orientation of Hot‐Pressed ZnS Ceramics from Precipitated Nanopowders

Pan

Kou

et al. 2016

J. Am. Ceram. Soc.

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In this study, transparent ZnS ceramics were hot pressed from precipitated wurtzite nanopowders. Influences of sintering temperature on wurtzite‐to‐sphalerite phase transition and densification behavior have been investigated. Maximum sphalerite phase content and highest densification were simultaneously obtained in the sample hot pressed at 900°C with uniaxial pressure of 250 MPa for 2 h, which accounts for the highest transmittance above 55% and 70% in the range 2–5 μm and 5–13 μm, respectively. Preferred orientation of wurtzite grains in [002] direction paralleled to the press direction was also observed, which is supposed to be benefit to transmittance by reducing birefraction and second‐phase scattering. Furthermore, second‐phase scattering caused by wurtzite grains has been investigated. It is found that fine grains are conducive to hot‐pressed ZnS ceramics with high transmittance, especially in the short‐wavelength range.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Densification Behavior, Phase Transition, and Preferred Orientation of Hot‐Pressed ZnS Ceramics from Precipitated Nanopowders

Pan

Kou

et al. 2016

J. Am. Ceram. Soc.

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“…A composition of this phase corresponding to TiO 0.43 C 0.57 , TiO O.16 C 0.84 and TiO O.09 C 0.91 was found for specimens hot pressed at 1800°C from powder TiB 2 , TiB 2 +2.05CB and TiB 2 +2.55CTP, respectively. Several of the intensities of the reflections for TiB 2 are not in accordance with the ICDD powder diffraction file for TiB 2 (Pattern: 00‐035‐0741), which is due to preferential grain orientation during hot pressing as recently reported by Jensen et al 23 Reflections due to unknown phases were also observed in sample TiB 2 +2.05C. Here we have compared with reference patterns of all known phases in the system Ti–B–O–C, and evidence for other phases containing O than TiO 1− x C x could not be found.…”

Section: Resultsmentioning

confidence: 64%

The Effect of Surface Oxides During Hot Pressing of TiB₂

Jensen

Einarsrud

Grande

2009

Journal of the American Ceramic Society

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Hot pressing of TiB2 has been investigated with particular emphasis on the evolution of secondary phases originating from the initial surface oxide layer on the TiB2 powders. Carbothermal reduction of the surface oxides during sintering was also investigated by adding carbon to the TiB2 powder. TiO1−xCx was shown to be the main secondary phase in hot‐pressed TiB2, and carbon was shown to strongly influence on sintering process and the amount, composition and distribution of the secondary phase TiO1−xCx. The formation of TiO1−xCx is discussed in relation to volatile boron oxide, which reacts with the graphite die to produce CO gas, which further may cause transport of carbon into TiB2 during sintering before pore closure. Finally it was demonstrated that the density could be controlled by addition of carbon to the TiB2 powder.

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“…33 The grains are initially randomly oriented, but some large grains with certain orientation tend to grow during sintering at the cost of smaller grains. 34 Since the liquid phases in the current study originate from the oxide layer on the starting powders, the amount is limited. Therefore, only those grades with very fine particles, i.e., the attritor milled powder based grades, are susceptible to this mechanism.…”

Section: Orientation Of Zrb 2 Grainsmentioning

confidence: 99%