重質碳酸鈣添加劑對泥漿及陶殼模性能影響

Effects of Heavy Calcium Carbonate Additive on the Properties of Slurry and Ceramic Shell Mold

10.29809/JTFS.200809.0004

高家豪(C. H. Kao)；王添炫(T. S. Wang)；戴君豪(J. H. Dai)；丁偉書(W. S. Ting)；俞佳蓁(J. J. Yu)；林祐任(Y. R. Lin)；楊國和(Ko-Ho Yang)

精密鑄造 ； 泥漿 ； 重質碳酸鈣 ； investment casting ； slurry ； heavy calcium carbonate

鑄造工程學刊

34卷3期（2008 / 09 / 01）

36 - 44

繁體中文

本研究在製作陶殼模用之背漿中，以重質碳酸鈣(Heavy Calcium Carbonate)為添加劑，探討其對泥漿的基本性能、流變性能及陶殼模機械性能與透氣度之影響。其中，面漿原料為鋯粉與水性矽膠液，背漿原料為馬來粉與水性矽膠液。 研究結果顯示：添加碳酸鈣對泥漿pH值、比重、水分及溫度變化影響不大。黏度因添加劑添加量之不同致影響所需穩定時間。當碳酸鈣添加於背漿時隨添加量增加，陶殼模濕態破斷強度與高溫破斷強度有下降趨勢，殘留破斷強度則有上升傾向。於800℃～1000℃進行燒結時，對陶殼模透氣度則有明顯的改善。

The heavy calcium carbonate additive has been added in the backup slurry of the ceramic shell mold. The effect of this additive on the basic properties and rheology of the slurry, the mechanical properties and permeability of the ceramic shell mold were studied. The materials for primary slurry were zircon flour and colloidal silica; for backup slurry, the materials were mullite and colloidal silica. The results showed that the calcium carbonate additive had little effects on pH value, specific gravity, moisture content and temperature of the slurry. According to the additive amount, the time for steady state were influenced by the viscosity of the slurry. While the additive addition amount in the backup slurry increased, the green strength and hot strength of ceramic shell mold were decreased; on the other hand, the fired strength was increased. The permeability was improved obviously while sintering at 800~1000℃.