Study of Mullite-IIIa Oxides Ceramics

Ushifusa, Nobuyuki; Ogihara, Satoru

doi:10.2109/jcersj.97.690

Cited by 4 publications

(2 citation statements)

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“…Most of the research on mullite have related to the improvement of the mechanical properties of the resulting mullite ceramics, including the powder preparation and their morphology control [1,2,3]. Recent trend of the research on mullite focuses on the low-temperature sintering with suitable additives and their thermal and electrical properties such as low thermal expansion coefficient and low dielectric constant [4,5,6]. This trend has been attracting much attention because of the increasing demand for the hybrid integration of the electronic devices using LTCC.…”

Section: Introductionmentioning

confidence: 99%

“…So far, Hashimoto et al have investigated the effect of the MgO addition on the reaction sintering of mullite ceramics with Ah0 3 and Si0 2 as sintering aids [6]. Ushifusa et al and Mitamura et al also reported the effect of Y 2 0 3 and other rare earth oxides addition on the sintering and properties of the mullite ceramics [4,5]. These additives react with residual Si0 2 in mullite powders to form rare earths silicate with low melting points, resulting in the low-temperature sintering.…”

Section: Introductionmentioning

confidence: 99%

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Low-temperature sintering of mullite with alumina and solution derived yttria

Suzuki¹,

Wakiya²,

Horimi³

et al. 2007

Trans. Mat. Res. Soc. Japan

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Mullite exhibits low dielectric constant, high strength and relatively low thermal expansion coefficient, and therefore, is useful as a substrate for high-speed computer. Mullite is also a candidate material for high-performance low-temperature eo-fired ceramic (LTCC) substrate because of the same reasons mentioned above. To apply the mullite substrate to LTCC, the reactivity of the mullite with elements that are contained in the glasses for low-temperature sintering should be investigated to choose the sintering aid for L TCC. In this paper, effect of the small amount of solution-derived yttoria addition on the sinterability of the mullite was investigated for the low-temperature sintering as well as the optimum amount of the alumina addition. The amount of the alumina addition was restricted within the solubility limit in mullite. As a result, faint amount of solution-derived yttria addition greatly enhanced the sinterability of the mullite because of the promotion of the liquid pahse sintering by the uniformly dispersed yttria phase. In this paper, the relation between microstructures and the mechanical properties of the resultant mullite ceramics was discussed.

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