| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide refractory that is excellent in spalling resistance, corrosion resistance and coating adhesivity, and is used in a kiln such as a cement rotary kiln which does not contain chromium. <P>SOLUTION: The basic refractory is characterized by containing 80-99 wt.% of a magnesia clinker, 0.5-10 wt.% of a spinel clinker and 0.5-10 wt.% of a zirconia raw material. Spalling resistance, corrosion resistance and coating adhesivity are improved by using magnesia as a main raw material component and including a suitable amount of the spiner clinker and the zirconia raw material in the basic refractory composition. A brick generates microcracks internally due to the difference of a thermal expansion coefficient with magnesia and therefor the spalling resistance is enhanced. The viscosity of a liquid phase produced upon the reaction of the zirconia raw material with the cement raw material is enhanced and in turn the corrosion resistance and the coating adhesivity are enhanced. Consequently, the basic refractory is suitable as a lining brick for the cement rotary kiln. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
