Graphite–boron composite heater in a Kawai-type apparatus: the inhibitory effect of boron oxide and countermeasures

Xie, Longjian; Yoneda, Akira; Yoshino, Takashi; Fei, Hongzhan; Ito, Eiji

doi:10.1080/08957959.2016.1164151

Cited by 16 publications

(5 citation statements)

References 7 publications

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“…It is known that B 2 O 3 is an important flux for silicate and oxides, which helps to decrease melting temperature significantly. We experienced the effect during the development of graphite-boron composite (GBC) heater 11 . A small amount of B 2 O 3 may form during sintering boron-MgO composite even though in the atmosphere of Ar + 1% H 2 .…”

Section: A Machinability Concept and Characterizationmentioning

confidence: 99%

Boron–MgO composite as an X-ray transparent pressure medium in the multi-anvil apparatus

Xie

Yoneda

et al. 2020

Review of Scientific Instruments

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X-ray transparent material is very beneficial for in-situ X-ray experiments in the multi-anvil apparatus. We sintered machinable blocks of boron-MgO composite at 800-1000 °C under atmospheric pressure from a mixture of amorphous boron and brucite or Mg(OH) 2 . Machinability of composite blocks improved with increasing brucite content in starting material; brucite content higher than 15 wt.% showed reasonable machinability in forming various shapes such as octahedron, cylinder, and sleeve. We confirmed feasibility of the boron-MgO pressure medium through successfully generating lower mantle pressure (>23 GPa); its pressure generation efficiency is comparable to that of Cr 2 O 3 doped MgO pressure medium. The boron-MgO composite is expected to be an excellent thermal insulator owing to extremely low thermal conductivity of amorphous boron; we confirmed its better performance of thermal insulating through a comparative heating test with zirconia sleeve in Cr 2 O 3 doped MgO pressure medium. Constituting light elements, the boron-MgO composite has high X-ray transparency, which enables us to conduct various cutting edge X-ray measurements in large volume multi-anvil apparatus.

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Section: A Machinability Concept and Characterizationmentioning

confidence: 99%

Boron–MgO composite as an X-ray transparent pressure medium in the multi-anvil apparatus

Xie

Yoneda

et al. 2020

Review of Scientific Instruments

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“…41 The chamber temperature was measured using a W 97 Re 3 −W 75 Re 25 thermocouple across the center of the sample. 42 In this study, the effect of pressure on the electromotive force of the thermocouple was not considered.…”

Section: Methodsmentioning

confidence: 99%

“…The chamber pressure was calibrated according to the literature values of pressure-induced phase transitions in Bi, ZnTe, and ZnS . The chamber temperature was measured using a W 97 Re 3 –W 75 Re 25 thermocouple across the center of the sample . In this study, the effect of pressure on the electromotive force of the thermocouple was not considered.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Highly Amorphous Fe₇₀Ti₂Y₆B₂₂ Bulk Alloy with Excellent Thermal Stability by Isothermal Compression under High Pressure

Wang

Jiang

Qin

et al. 2022

Crystal Growth & Design

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A highly amorphous Fe 70 Ti 2 Y 6 B 22 bulk alloy, with a diameter of 3 mm and a height of 2 mm, was synthesized by applying isothermal compression from 10 to 15 GPa at 1473 K using mixed metal powder. The structural analyses by performing Xray diffraction and transmission electron microscopy revealed that the alloy was composed of a glassy structure. According to the differential scanning calorimetry analysis, a large supercooled liquid region (ΔT x ) of approximately 550 K was obtained, which is caused by the highly densely packed structures of a highly amorphous Fe 70 Ti 2 Y 6 B 22 bulk alloy. The value was six times the value obtained by rapid cooling. Also, the Vickers hardness of the sample was approximately 8.5 GPa at a loading force of 29.4 N. These results indicated that isothermal compression under high pressure is a feasible method for fabricating bulk metallic glasses satisfying large-size requirements.

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“…[9] Accordingly, the metals with high melting points, such as tantalum (Ta) and rhenium (Re), are widely used as heating materials in high pressure experiments. [14] The maximum attainable temperatures are approximately 2000 K and 2700 K for Ta and Re, which are lower than their melting points (∼ 3000 • C). [6,15] When refractory metals were used as heaters, Ito et al proposed that a small amount of hydrogen, from residual water in the assembly, dissolved into the metal heaters, which lowered the melting temperature of the refractory metals greatly.…”

Section: Introductionmentioning

confidence: 94%

A double-layer heating method to generate high temperature in a two-stage multi-anvil apparatus*

Peng¹,

Kou²,

Zhao³

et al. 2020

Chinese Phys. B

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A new heating method is proposed to increase the cell temperature of the 6–8 type multi-anvil apparatus without reducing the volume of the sample chamber. The double-layer heater assembly (DHA) has two layers of heaters connected in parallel. The temperature of the cell was able to reach 2500 °C by using 0.025 mm rhenium foils, and the temperature limit was increased by 25% compared with that of the traditional single-layer assembly. The power–temperature relationships for these two assemblies with different sizes were calibrated by using W/Re thermocouple at 20 GPa. When the volume of samples was the same, the DHA not only attained higher temperature, but also kept the holding time longer, compared to the traditional assembly. The results of more than ten experiments showed that the new 10/4 DHA with a relatively large sample size (2 mm in diameter and 4 mm in height) can work stably with the center temperature of the sample cavity exceeding 2300 °C under the pressure of 20 GPa.

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Graphite–boron composite heater in a Kawai-type apparatus: the inhibitory effect of boron oxide and countermeasures

Cited by 16 publications

References 7 publications

Boron–MgO composite as an X-ray transparent pressure medium in the multi-anvil apparatus

Boron–MgO composite as an X-ray transparent pressure medium in the multi-anvil apparatus

Synthesis of Highly Amorphous Fe₇₀Ti₂Y₆B₂₂ Bulk Alloy with Excellent Thermal Stability by Isothermal Compression under High Pressure

A double-layer heating method to generate high temperature in a two-stage multi-anvil apparatus*

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Graphite–boron composite heater in a Kawai-type apparatus: the inhibitory effect of boron oxide and countermeasures

Cited by 16 publications

References 7 publications

Boron–MgO composite as an X-ray transparent pressure medium in the multi-anvil apparatus

Boron–MgO composite as an X-ray transparent pressure medium in the multi-anvil apparatus

Synthesis of Highly Amorphous Fe70Ti2Y6B22 Bulk Alloy with Excellent Thermal Stability by Isothermal Compression under High Pressure

A double-layer heating method to generate high temperature in a two-stage multi-anvil apparatus*

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Synthesis of Highly Amorphous Fe₇₀Ti₂Y₆B₂₂ Bulk Alloy with Excellent Thermal Stability by Isothermal Compression under High Pressure