Fabrication of phosphate-bonded mica ceramics by hot isostatic processing

Hattori, Takeo; Yahata, Akihiro; Mohri, Jun-ichi; Yoshimura, Masaki; Sōmiya, Shigeyuki

doi:10.1007/bf00720075

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…The use of water at a high pressure and temperature for the hydrothermal hot isostatic pressing of mica powders was previously proposed and investigated, e.g., by [ 17 , 18 ]. However, to the best of our knowledge, the hydrothermal isostatic pressing treatment of metal parts, and more specifically for additive material metal parts, has not been attempted.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Hot Isostatic Pressing (HHIP)—Experimental Proof of Concept

Aviezer,

Ariely,

Bamberger

et al. 2024

Materials

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A new hydrothermal hot isostatic pressing (HHIP) approach, involving hydrothermal water conditions and no usage of inert gas, was hypothesized and tested on 3D-printed Al-10%Si-0.3%Mg (%Wt) parts. The aluminum-based metal was practically inert at the applied HHIPing conditions of 300–350 MPa and 250–350 °C, which enabled the employment of a long (6–24 h) HHIP treatment with hardly any loss of material (the overall loss due to corrosion was mostly <0.5% w/w). Applying the new approach on the above-mentioned samples resulted in an 85.7% reduction in the AM micro-pores, along with a 90.8% reduction in the pores’ surface area at a temperature of 350 °C, which is much lower than the 500–520 °C applied in common argon-based aluminum HIPing treatments, while practically maintaining the as-recieved microstructure. These results show that better mechanical properties can be expected when using the suggested treatment without affecting the material fatigue resistance due to grain growth. The proof of concept presented in this work can pave the way to applying the new HHIPing approach to other AM metal parts.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Hot Isostatic Pressing (HHIP)—Experimental Proof of Concept

Aviezer,

Ariely,

Bamberger

et al. 2024

Materials

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“…Hot-isostatic pressing of synthetic mica [1,2] and Co304 [3] using a closed system has been reported. Synthetic mica (fluorphlogopite), whose crystals are typically plate-like, could be both relatively fully sintered with [2] and without [1] additives by hotisostatic pressing using a glass capsule.…”

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confidence: 99%

“…Synthetic mica (fluorphlogopite), whose crystals are typically plate-like, could be both relatively fully sintered with [2] and without [1] additives by hotisostatic pressing using a glass capsule. On the other hand, Co304, changes to monoxide at 900 to 950°C in air [4] and could be consolidated only to 3.1 g cm -3 corresponding to 51% theoretical density (green density = 38.4T.D.)…”

mentioning

confidence: 99%

“…and 20ram long after degassing for l h at 100°C and 1.33 x 10 3pa (1 x 10 5torr)usingan oil diffusion pump. The encapsulated specimen was isostatically hot-pressed for 1 and 2 h at temperatures between 600 and 800°C and at pressures varying from 50 to 150 MPa, using a test-tube-type HIPer with water at high temperature and high pressure [1][2][3]. Then the temperature was first raised prior to applying pressure because of the need to soften the container glass.…”

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Consolidation of molybdenum disulphide by hot isostatic processing

et al. 1987

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There are several compounds in molybdenum sulphide, e.g. Mo2S3, MoS2, Mo285, M o S 3. Among them a crystal structure of molybdenum disulphide (MoS2) is a layer lattice, as is the case for graphite or mica. F u r t h e r m o r e , M o S 2 is thermally active and easily oxidized in air to MoO 3. M o S 2 is also known to change to molybdenum metal via sequisulphide on heating in inert gases. For these reasons, it is interesting to study whether MoS2 powder compacts can be successfully consolidated to high density.Hot-isostatic pressing of synthetic mica [1, 2] and Co304 [3] using a closed system has been reported. Synthetic mica (fluorphlogopite), whose crystals are typically plate-like, could be both relatively fully sintered with [2] and without [1] additives by hotisostatic pressing using a glass capsule. On the other hand, Co304, changes to monoxide at 900 to 950°C in air [4] and could be consolidated only to 3.1 g cm -3 corresponding to 51% theoretical density (green density = 38.4T.D.) when sintered at 900°C in air. We then attempted to densify Co304 powder conpacts by hot-isostatic pressing under 150 MPa at 800 ° C for 2 h using glass containers and obtained dense bodies of above 92% theoretical density.

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High-Pressure Hot Isostatic Pressing of Synthetic Mica

Hattori

Yoshimura

Sōmiya

1989

Hydrothermal Reactions for Materials Science and Engineering

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Powder compacts of synthetic mica CfZuorphlogopite) encapsulated in a borosilicate glass tube were isostatically hot-pressed using high-pressure-hightemperature hot isostatic pressing equipment with Ar gas and a M o heater. Synthetic mica was isostatically hot-pressed, while retaining the composition and structure of the starting material, to 96.8% of theoretical density without additives at 500 MPa and 700 O? for 3 11.

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Fabrication of phosphate-bonded mica ceramics by hot isostatic processing

Cited by 7 publications

References 2 publications

Hydrothermal Hot Isostatic Pressing (HHIP)—Experimental Proof of Concept

Hydrothermal Hot Isostatic Pressing (HHIP)—Experimental Proof of Concept

Consolidation of molybdenum disulphide by hot isostatic processing

High-Pressure Hot Isostatic Pressing of Synthetic Mica

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