Effects of Composition and Calcination Temperature on Ceramic Shell Strength
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Accession number;05A0868217
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| Title;Effects of Composition and Calcination Temperature on Ceramic Shell Strength |
| Author;
FUKUDA YOYA
(Kimura Chuzosho Co., Ltd., JPN)
KANNO TOSHITAKE
(Kimura Chuzosho Co., Ltd., JPN)
FUKUO TAIJI
(Kimura Chuzosho Co., Ltd., JPN)
HAYASHI KEN'ICHI
(Kimura Chuzosho Co., Ltd., JPN)
NAKAE HIDEO
(Waseda Univ., School of Sci. & Engineering, JPN)
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Journal Title;Journal of Japan Foundry Engineering Society
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Journal Code:G0096A
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ISSN:1342-0429
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VOL.77;NO.10;PAGE.689-695(2005)
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| Figure&Table&Reference;FIG.14, TBL.4, REF.10 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;In order to produce various stainless steel castings, a new ceramic mold making process based on full mold EPS patterns has been developed. In this method, a ceramic shell approximately 10 mm in thickness is created by applying a coating to EPS pattern, which is then heated in a furnace in order to gasify the EPS pattern and harden the ceramic shell coating. Unlike the Replicast process, the ceramic shell thus formed requires neither a vacuum nor back up sand for the pouring, and being pre-heated, is not subject to thermal stress. The strength of the ceramic shell at high temperatures is very important since support sand is not used. A trace of the x-ray diffraction measurements revealed that the cristobalite peak occurs at 21.9.DEG.. When the ratio of fused silica is increased, the cristobalite intensity rises significantly and the post-cooling bending strength decreases. It is thought that because fused silica transforms into cristobalite, a large thermal contraction occurs during the cooling period owing to the decrease in bending strength, and as a result, many fine cracks are generated throughout the ceramic material. The results suggest that the most suitable refractory material for the ceramic mold is a 1:1 mixture of zircon and fused silica. On this basis, pre-heated ceramic molds have been used without back-up sand to produce various stainless steel castings. (author abst.) |
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