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作者：DU-HWA JEONG;HYO-JOON KIM;YONG-HUM KIM;

作者單位：Iron & Steel Making Process Research Team, RIST Pohang, Korea #699 Kumho-Dang, Kwangyang City, Jeollanam-Do, 545-090 Korea

刊名：Journal of the Technical Association of Refractories

ISSN：0285-0028

出版年：2003-01-05

卷：23

期：1

起頁：4

止頁：10

分類號：TQ175

語種：英文

關鍵詞：

內容簡介

In order to develop a high performance basic dam block for the tundish vessel in steelmaking, the influences of raw materials, binders, and additives on the hydration and high temperature properties of magnesia castables were studied. Crack initiation and propagation in cement-bonded magnesia castables caused by the slaking of magnesia aggregate during drying were suppressed by replacing magnesia powder with spinel aggregate. In the case of Na_2O centre dot 2CaO centre dot P_2O_5 (NC_2P) bonded castables, the slaking of magnesia aggregate that initiates cracks could be suppressed by adding a sufficient amount of phosphate, but hot bending strength was reduced with excess amounts of phosphate. Mechanical properties of NC_2P-bonded castables at high temperatures were improved by using magnesia aggregates of low SiO_2 contents.