ケイ素ポリマーをシリカ源とした焼成収縮の少ないムライト基セラミックスの作製

概要

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Monolithic mullite was synthesized from polymer (cross-linked polysiloxane)/filler (alumina) blends. By virtue of a chemical oxidation reaction of ZrSi_2, intentionally added in increasing fractions, a nearly zeroshrinkage mullite based composite could be obtained by conventional sintering. The composites specimen after sintering were composed of mullite and monoclinic ZrO_2, according to the ZrSi_2 fraction added to the starting mixture. Low-shrinkage mullite based ceramics could be obtained when the content of ZrSi_2 was between 30 and 50 mol%. In the case of ZtSi_2 50 mol%, the shrinkage was as low as 4.5%, although some specimen was found cracked after sintering. The upper limit for ZtSi_2 addition was considered to be ≈50 mol% because of inhomogeneity related mixing a low fraction of siloxane polymer (liquid) with the filler (solid).
社団法人日本セラミックス協会の論文
1999-10-01