Fine-grained ZrSiO4/3Y-TZP Ceramic Hot-pressed from 3Y-TZP Powders Coated with SiO2 Layer

Journal of Inorganic Materials

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Fine-grained ZrSiO₄/3Y-TZP Ceramic Hot-pressed from 3Y-TZP Powders Coated with SiO₂ Layer

WANG Shi-Wei; RONG Tian-Jun; HUANG Xiao-Xian; GUO Jing-Kun

Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China）

Received:2001-03-14 Revised:2001-05-07 Published:2002-03-20 Online:2002-03-20

Abstract

Abstract: 3Y-TZP powder coated with SiO₂ layer, prepared by the wet chemical method, was hot-pressed to fine-grained ZrSiO₄/3Y-TZP composite. The phases and
microstructure of the sintering bodies were characterized by X-ray diffraction and TEM. Below 1300℃, the coated powder was sintered to higher density
by means of transient viscous sintering. With increasing temperature, SiO₂ reacted with ZrO₂to form ZrSiO₄. ZrSiO₄/3Y-TZP ceramic with an average
grain size of 350nm was obtained when the coated powder was hot-pressed at 1500℃ for 1h. It was suggested that SiO₂ layer made greater contributions to the
formation of the fine-grained ZrSiO₄/3Y-TZP composite.

Key words: coated powder, hot pressing, ZrSiO₄/3Y-TZP

CLC Number:

TQ174

WANG Shi-Wei,RONG Tian-Jun,HUANG Xiao-Xian,GUO Jing-Kun. Fine-grained ZrSiO₄/3Y-TZP Ceramic Hot-pressed from 3Y-TZP Powders Coated with SiO₂ Layer[J]. Journal of Inorganic Materials.

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Fine-grained ZrSiO₄/3Y-TZP Ceramic Hot-pressed from 3Y-TZP Powders Coated with SiO₂ Layer

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