摘要
用静态坩埚法研究了煤熔渣对几种 Al_2O_3-Cr_2O_3耐火材料的侵蚀性。Cr_2O_3均布的试样中煤熔渣很快渗透,吸渣量较大,使工作带的铬刚玉晶粒在液相中散开;而基质中富 Cr_2O_3的试样吸渣量少,在渣-耐火材料界面形成β-Al_2O_3和 CaO·6Al_2O_3密集层,有助于减小渣渗透和保持材料工作面基体的基本完整,其中含锆硅质玻璃相的试样即使 Cr_2O_3含量较低,也保持最小的吸渣量和渗透深度。
ABSTRACT The study of the coal slag attack on several Al_2O_3—Cr_2O_3refractories bymeans of cup slag test was conducted.The fused(or sintered),rebonded chrome-aluminarefractories had the open pore structure and uniform textural appearance that were easilypenetrated by molten coal slag.The importance of the fine chromic oxide addition in min-imizing corrosive attack was evident.The specimens with the fine chromic oxide additionhad the more closed,discontinuous pore structure due to reaction and sintering with thefine chromic oxide to form a bonding matrix and rims around the coarse grains.The denselayers consisting of β-Al_2O_3and CaO·6Al_2O_3were formed at the slag-refractory interfaceof them,which had contributed to limite the slag penetration into refractories and hold theintergrity of working face bulk.The movement of ions in slag into the interior of themicrostructure seems to be slow down or blocked by the baddeleyite glassy phase.
关键词
煤熔渣
CR2O3
耐火材料
气化炉
molten coal slag
chrome-alumina refractories
dense layer
the baddeleyite glassy phase
