• Title/Summary/Keyword: 소결 세라믹

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Powder Preparation and Sintering Properties of PZT-Ceramics by Coprecipitation (공침법에 의한 PZT의 분체제조 및 소결특성)

  • 안영필;김복희;이병우
    • Journal of the Korean Ceramic Society
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    • v.25 no.1
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    • pp.54-58
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    • 1988

  • In order to depress PbO vaporization during calcination and improve sinterability in low temperature, a method for preparing homogeous Lead-Zirconate-Titanate (PZT) powder from aqueous salt solution by precipitation is described. In this method, single phae PZT fine powders are formed at above 500$^{\circ}C$. PZT-ceramics using these powders have high sinterability, and good sintering characteristics relatively low temp. (-high apparent density, low porosity, low water adsorption etc.)

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Application of Sol-Gel Coating Process in Pressureless Sintering of Si3N4 and Their Properties (알루미나 졸-겔 코팅 공정을 이용한 질화규소의 상압소결 및 물질 특성)

  • 임경란;임창섭
    • Journal of the Korean Ceramic Society
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    • v.31 no.1
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    • pp.69-73
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    • 1994

  • Si3N4 ceramics could be densified above 3.2g/㎤ with pressureless sintering at below 178$0^{\circ}C$ by coating Si3N4 and Y2O3 powder with an alumina sol. Substitution a portion of Al2O3 with AlN improved densification. Additional milling of the coated powder in large improvement in bending strength greater than 800 MPa (4-point).

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Effect of heating Rate on the Microstructural Evolution during Sintering of PZT Ceramics (PZT 요업체의 소결과정 중 승온속도가 미세조직에 미치는 영향)

  • 박은태;김정주;조상희;김도연
    • Journal of the Korean Ceramic Society
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    • v.27 no.8
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    • pp.1020-1026
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    • 1990

  • The effect of heating rate on the microstructural evolution during sintering of PZT ceramics has been investigated. In case of PZT powder compacts containing excess of PbO, fast heating caused incomplete rearrangement of solid grains in a liquid, resulting in lower density and inhomogeneous pore shape ; on contrary, slow heating resulted in better densification. In contrast, in case of compacts without excess PbO, the densification was enhanced by fast heating due to suppression of the grain growth.

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