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2 Archives of Metallurgy and Materials

2 2015

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Preparation Of Fine Grained SiC At Reduced Temperature By Two-Step Sintering

Kim K.-W., Oh K.-S., Lee H., Kim B. S., Chung T.-J.

Archives of Metallurgy and Materials

2015

Vol. 60, iss. 2B

1539--1542

Two-step sintering route was applied for the densification SiC by promoting the role of liquid phase. The specimen contained 8 vol% of liquid phase composed of Al2O3 and Y2O3. The heating schedule consisted with initial rapid heating to 2000°C and immediate quenching to 1700 or 1750°C. By heating at elevated temperature, even distribution of the liquid phase was intended. The heat treatment at reduced temperature was to suppress the evaporative loss of the liquid and to secure the time for densification. The two-step sintering effectively suppressed loss of mass and coarsening. The resultant SiC was thus dense and was composed of fine grains exhibiting hardness of 2321 kgf/mm2.

Joining Of Green Body And Dense Substrate For Indium Tin Oxide Under Uniaxial Pressure In An Open Condition

Moon G.-S., Chung T.-J., Yang S. H., Hong G.-S., Oh K.-S.

Archives of Metallurgy and Materials

2015

Vol. 60, iss. 2B

1209--1212

The green body and dense substrate of indium tin oxide was joined by uniaxially pressing at 0.3 MPa at 1300°C to test the restoring of the eroded part of transparent conducting oxide target. The green body was sintered to 98% of theoretical density under the suppression of shrinkage along the boundary below 5%. The boundary between two parts was free of pore but could be recognized from the difference in grain sizes. The joined part had the virtually same density with the substrate, but the grain size was less than one fifth compared with that of substrate.