Room-temperature gelcasting of alumina with a water-soluble copolymer

Yang, Yan; Shimai, Shunzo; Wang, Shiwei

doi:10.1557/jmr.2013.132

Cited by 88 publications

(63 citation statements)

References 18 publications

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“…The water soluble amide-ammonium type of the alternative copolymer of isobutylene and maleic anhydride contains three kinds of functional groups (-COO-NH 4 + , -CONH 2 , and -COOH). 22 At very low concentrations, these polymer chains reside on the surface of ceramic powder particulates, allowing to reduce the friction and aggregation among the hexaferrite particles and essentially acting as a dispersant. However, throughout water exclusion process in the magnetic-field press, these chains form bonds with each, and eventually establish an organic network that holds the particles together and acts as a binder.…”

Section: Resultsmentioning

confidence: 99%

Tailoring magnetic properties of self-biased hexaferrites using an alternative copolymer of isobutylene and maleic anhydride

Zhong

Соколов

et al. 2018

AIP Advances

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Discussed is a novel self-biased hexaferrite gelling system based on a nontoxic and water-soluble copolymer of isobutylene and maleic anhydride. This copolymer simultaneously acts as a dispersant and gelling agent, and recently received much attention from the ceramics community. Herein its effects on the rheological conditions throughout magnetic-field pressing, and consequently, orientation, density and magnetic properties of textured hexaferrites were investigated. Ka-band FMR linewidths were measured, and the crystalline anisotropy and porosity induced linewidth broadening were estimated according to Schlömann’s theory. The copolymer allowed to reduce the friction between micron-sized magnetic particulates, resulting in higher density and degree of crystalline orientation, and lower FMR linewidth.

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Section: Resultsmentioning

confidence: 99%

Tailoring magnetic properties of self-biased hexaferrites using an alternative copolymer of isobutylene and maleic anhydride

Zhong

Соколов

et al. 2018

AIP Advances

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“…AlN, Y 2 O 3 , and the waterproof agent were mixed in alcohol for 2 h, and then the mixed slurry was dried at 50 ℃. PIBM with an average molecular weight of 160 000-170 000 (ISOBAM 110#, Kuraray, Osaka, Japan) was used as both dispersant and gelling agent [11], and its molecular structure is shown in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

“…In 2013, Yang et al [11] developed a simple method for gel-casting of alumina ceramics using a non-toxic and water-soluble copolymer of isobutylene and maleic anhydride (simply noted as PIBM). It only needed small amount of PIBM (0.3 wt%) which acted as both dispersant and gelling agent for gel-casting of ceramics.…”

Section: Introductionmentioning

confidence: 99%

Gel-tape-casting of aluminum nitride ceramics

Shang

Wang

et al. 2017

J Adv Ceram

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Aluminum nitride ceramic sheets were formed for the first time by a novel and simple method, namely gel-tape-casting process, where only two additives were used to prepare the slurries. PIBM (a water-soluble copolymer of isobutylene and maleic anhydride) acted as both dispersant and gelling agent, and PEG (polyethylene glycol) acted as plasticizer. Combining the advantages of gel-casting and tape-casting processes, flexible and uniform green tapes were obtained. The rheological properties of AlN slurries were studied to optimize the PIBM content and solids loading. After drying and debinding, the green sheets were sintered at 1840 ℃ in N 2 atmosphere. Homogeneous microstructure with average grain size of about 7 μm was observed in the final AlN ceramics. Thermal conductivity of the AlN ceramics was 161 W/(m·K).

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“…PIBM with an average molecular weight of 55000-65000 (Isobam 104, Kuraray, Osaka, Japan), was used as both dispersant and gelling agent. The process for preparation of the alumina green body using PIBM was similar to a previous report [12]. Isobam 600AF from the same company with a molecular weight of 5500-6500 was added to increase solids loading [15].…”

Section: Materials and Samples Preparationmentioning

confidence: 99%

“…They were gelcast using a copolymer of isobutylene and maleic anhydride (PIBM, hereinafter) [12,13]. For comparison, alumina green body was also cast by a epoxy-amine gel system [14].…”

Section: Introductionmentioning

confidence: 99%