Development of Rapid Debinding Treatment Using Superheated Steam and Debinding Behavior for Alumina Molded Bodies

Nakamura, Terumi; Wada, M.; Hayashi, Kazumi; Kitaoka, Satoshi; Nagai, Takahiro; Yano, Jin; Muto, Norio; Nakahira, A.

doi:10.2497/jjspm.66.275

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Superheated steam treatment has long been used for cutting tools 16) . Superheated steam is a type of vapor produced by adding heat to saturated water steam 17) . A complex oxide layer with Fe2O3 and Fe3O4 structures forms on the steel surface, improving its corrosion and tribological properties 18,19) .…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of AISI H13 Tool Steel via Atmospheric-pressure Plasma Nitriding and Superheated Steam Treatment

Miyamoto,

Yoshida

2024

ISIJ Int.

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Samples treated using conventional plasma nitriding have good surface hardness, wear resistance, corrosion resistance, and fatigue strength, but their friction coefficients are not low enough. This study presents a novel method of reducing the friction coefficient of AISI H13 tool steel through a hybrid treatment consisting of atmospheric-pressure plasma nitriding and superheated steam treatment. The surface structures and tribological and mechanical properties of a hybrid-treated sample were investigated. Results showed that atmospheric-pressure plasma nitriding had no effect on the formation of Fe3O4, which improves the corrosion and tribological properties of tool steel. The surface of the hybrid-treated sample had an oxide layer separated into two layers. The nitrided and non-nitrided samples had nearly the same thickness of the oxide layer.The outermost layer of the hybrid-treated sample contained almost no Cr, a large amount of nitrogen, and small amounts of Fe and O. From its outermost surface to its base material, this sample had a three-layer structure consisting of a nitride layer, a Fe3O4 layer, and a Cr-rich oxide layer. The depth of the diffusion layer of the hybrid-treated sample was greater than that of a sample treated using atmospheric-pressure plasma nitriding only. The outermost surface of the hybrid-treated sample was softer than its inner part, and the hybrid-treated sample had the lowest friction coefficient among all samples. Overall, the hybrid treatment reduced the friction coefficient and improved the wear resistance of AISI H13 tool steel.

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Section: Introductionmentioning

confidence: 99%

Surface Modification of AISI H13 Tool Steel via Atmospheric-pressure Plasma Nitriding and Superheated Steam Treatment

Miyamoto,

Yoshida

2024

ISIJ Int.

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“…Microwave debinding takes 60 min to dry a 2500 kg ceramic material containing 20 percent free water [14]. Nakamura et al treated the green body with superheated steam at a rate of 10 °C min −1 to 800 °C, the carbon removal rate is 99.3% [15]. Santos et al used abnormal glow discharge of cathode in hydrogen, treated at 400 °C for 10 min, and removed polypropylene in powder injection molding samples [16].…”

Section: Introductionmentioning

confidence: 99%

Research on new ceramic debinding technology with low energy consumption via dielectric barrier discharge

et al. 2023

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To combat the issue of global warming, we must conserve energy and reduce carbon emissions from energy production and use. Industrial process electrification can greatly save energy and minimize carbon emissions. The energy consumption of debinding and drying in the ceramic industry accounts for about 20%. The conventional thermal debinding method is energy-intensive and time-consuming. It is critical to develop green debinding techniques that are energy-efficient and environmentally friendly. Based on the dielectric barrier discharge measurements, the impacts of various voltages(Upp 16-22kV), frequencies(9-12kHz), air gap widths(0-3mm), and treatment time(0-60min) on the debinding efficiency are investigated in this work for the ZnO ceramic system. Dielectric barrier discharge debinding time and energy consumption per unit volume of sample can be reduced to 5% and 10% of conventional debinding, respectively, which is a potential method to realize electrical energy replacement in the ceramic debinding process.

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Effect of Superheated Steam Amount and Temperature on Rapid Debinding of Alumina Molded Bodies

Nakamura

Muto

Nakahira

2020

J. Soc. Mat. Sci., Japan

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In this study, rapid debinding of alumina molded bodies was carried out using superheated steam at 1 kg / h to 5 kg / h. The superheated steam treatment was performed with a temperature increase of 10 °C / min to a holding temperature range of 600 °C to 800 °C. For the alumina molded body, the carbon removal rate increase in the case of debinding treatment with superheated steam amount of 3 kg / h to 5 kg / h compared with 1 kg / h of superheated steam. The molded body resulted in a carbon removal rate of 98.8 % after treated with superheated steam at 800 °C with 5 kg / h. No cracking occurred in alumina molded bodies obtained by debinding in superheated steam. However, cracks occurred in debindied bodies that had been treated in air under similar temperature conditions. No cracking occurred in sintered bodies obtained by debinding in superheated steam and then firing at 1,600 °C in air. However, many large cracks occurred in sintered bodies that had been treated in air or nitrogen under similar temperature conditions. Thus, it was suggested that superheated steam treatment is highly effective for rapid debinding of molded alumina bodies.

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Development of Rapid Debinding Treatment Using Superheated Steam and Debinding Behavior for Alumina Molded Bodies

Cited by 5 publications

References 7 publications

Surface Modification of AISI H13 Tool Steel via Atmospheric-pressure Plasma Nitriding and Superheated Steam Treatment

Surface Modification of AISI H13 Tool Steel via Atmospheric-pressure Plasma Nitriding and Superheated Steam Treatment

Research on new ceramic debinding technology with low energy consumption via dielectric barrier discharge

Effect of Superheated Steam Amount and Temperature on Rapid Debinding of Alumina Molded Bodies

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